Multiplex Transmission System Wherein Analog Signal Is Transformed to Base Band Random-Transformed and Superimposed on Dispersed Signal Points in Vector Signal Space

1. A transmission system comprising a transmitter; a receiver; and an analog transmission line interconnecting said transmitter and said receiver; said transmitter comprising: a data signal point generation means for receiving a serial digital data signal and generating a first vector base band signal corresponding to a data point signal in a vector signal space, based on a block series of samples of the received serial digital data signal, wherein the generated data signal point is one of a plurality of predetermined data signal points in the vector signal space; a base band signal transformation means for receiving an analog signal in the form of an analog passband signal and transforming the analog passband signal into a second vector base band signal, a vector signal superimposing means for superimposing a plurality of vector components of the second vector base band signal on a plurality of vector components of the first vector base band signal, component by component, to generate a superimposed vector base band signal; and a modulation means for modulating the superimposed vector base band signal to generate an analog modulated signal to be transmitted through said analog transmission line; said receiver comprising: a demodulator means for receiving the analog modulated signal transmitted through the analog transmission line and demodulating the analog modulated signal to regenerate the superimposed vector base band signal; a decision means for receiving the regenerated superimposed vector base band signal and determining to which one of the plurality of predetermined data signal points in the vector signal space the regenerated superimposed vector base band signal corresponds, to regenerate the first vector base band signal; a vector signal subtracter means for receiving the regenerated superimposed vector base band signal and the regenerated first vector base band signal and subtracting a plurality of vector components of the first vector base band signal from a plurality of vector components of the superimposed vector base band signal, component by component, to regenerate the respective vector components of the second base band signal; a code transformation means for receiving the first vector base band signal, and transforming the first vector base band signal to regenerate the serial digital data signal; and a passband transformation means for receiving the regenerated second base band signal, and transforming the regenerated second base band signal to regenerate the analog signal in the form of the passband signal.

2. A transmission system according to claim 1, wherein said demodulator means comprises an equalizer means for equalizing the analog modulated signal after demodulated to regenerate the superimposed vector base band signal.

3. A transmission system according to claim 2, wherein said transmitter further comprises a random transformation means provided between the base band transformation means and the vector signal superimposing means, for receiving the second vector base band signal from the base band transformation means and shifting a phase of the second base band signal by random phase shift values, to generate and supply, to the vector signal superimposing means, a randomly transformed second vector base band signal so that a frequency spectrum of the second vector base band signal uniformly spreads over a whole frequency band; said vector signal superimposing means receiving the randomly transformed second vector base band signal, superimposing a plurality of vector components of the randomly transformed second vector base band signal, instead of the second vector base band signal, on a plurality of vector components of the first vector base band signal, component by component, to generate a superimposed vector base band signal.

4. A transmission system according to claim 3, wherein said demodulator means regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; said receiver further comprising an inverse random transformation means for inversely shifting the phase, which is randomly shifted by the random transformation means in the transmitter, of the randomly transformed second vector base band signal to regenerate and supply to the passband transformation means the second vector base band signal.

5. A transmission system according to claim 4, wherein said transmitter further comprises a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means; said data signal point generation means receiving the scrambled serial data signal instead of the serial digital data signal, and generating the first vector base band signal, based on a block series of samples of the received serial digital data signal after the serial data signal has been scrambled by the scrambler means.

6. A transmission system according to claim 5, wherein said code transformation means in said receiver receives the first vector base band signal, end transforms the first vector base band signal to regenerate the scrambled serial digital data signal; and said receiver further comprising a descrambler means for descrambling the scrambled digital data signal to regenerate the digital data signal.

7. A transmission system according to claim 2, wherein said transmitter further comprises a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means; said data signal point generation means receiving the scrambled serial data signal instead of the serial digital data signal, and generating the first vector base band signal, based on a block series of samples of the received serial digital data signal after the serial data signals has been scrambled by the scrambler means; said transmitter further comprising a random transformation means, provided between the base band transformation means, for receiving the second vector base band signal from the base band transformation means, and shifting a phase of the second base band signal by random phase shift values, to generate and supply, to the vector signal superimposing means, a randomly transformed second vector base band signal so that a frequency spectrum of the second vector base band signal uniformly spreads over a whole frequency band; said vector signal superimposing means receiving the randomly transformed second vector base band signal, superimposing a plurality of vector components of the randomly transformed second vector base band signal, instead of the second vector base band signal, on a plurality of vector base band signal, component by component, to generate a superimposed vector base band signal; and wherein said random transformation means comprises: a first bit extracting means for serially receiving the output of the scrambler means, and obtaining blocks of bits from the output of the scrambler means; a first phase generation means for receiving said blocks of bits and determining phase shift values according to the values of the blocks of bits supplied from the first bit extracting means, respectively, and generating random phase vector signals respectively having phases of the phase shift values; and a first multiplier means for receiving the digital base band signal from the base band transformation means and the random phase vector signals from the first phase generation means, and multiplying the digital base band signal by the random phase vector signals to generate the randomly transformed vector base band signal.

8. A transmission system according to claim 7, wherein said demodulator means of said receiver regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; said receiver further comprising an inverse random transformation means for inversely shifting the phase, which is randomly shifted by the random transformation means of the transmitter, of the randomly transformed second vector base band signal to regenerate and supply, to the passband transformation means, the second vector base band signal; said code transformation means of said receiver receiving the first vector base band signal, and transforming the first vector base band signal to regenerate the scrambled serial digital data signal; said receiver further comprising a descrambler means for descrambling the scrambled digital data signal to regenerate the digital data signal; and wherein said inverse random transformation means comprises: a second bit extracting means for serially receiving the output of the scrambler means, and obtaining blocks of bits from the output of the code transformation means; a second phase generation means for receiving said blocks of bits from said second bit extracting means and determining phase shift values according to the values of the blocks of bits supplied from the second bit extracting means, respectively, and generating random phase vector signals respectively having phases of the phase shift values; and a second multiplier means for receiving the second digital base band signal from the vector signal subtracter means and the random phase vector signals from the phase generation means, and multiplying the second digital base band signal by the random phase vector signals to perform inversely random transformation for the randomly transferred vector base band signal and obtain the vector base band signal before the random transformation.

9. A transmission system according to claim 1, wherein said transmitter further comprises an amplitude control circuit for receiving the second vector base band signal from the base band transformation means, and controlling an amplitude of the second vector base band signal so that the amplitude of the second base band signal is maintained below a predetermined level.

10. A transmission system according to claim 9, wherein a secondary channel is provided from the receiver to the transmitter; and said receiver comprising a signal quality detecting means for monitoring an error rate in the second digital base band signal regenerated by the vector signal subtracter means, and transmitting information on the error rate from the transmitter to the receiver through the secondary channel.

11. A transmission system according to claim 10, wherein said transmitter further comprises an amplitude control signal generating means for receiving the information on the error rate from the signal quality detecting means in the receiver, and generating and supplying to the amplitude control circuit an amplitude control signal for controlling an operation of the amplitude control circuit.

12. A transmission system according to claim 11, wherein said amplitude control circuit of the transmitter comprises: an automatic gain control means for receiving the second vector base band signal from the base band transformation means, and controlling the amplitude of the second vector base band signal according to the amplitude control signal; a maximum level limiting means for limiting positive peaks of the respective vector components of the second vector base band signal, after the amplitude of the second vector base band signal has been controlled by the automatic gain control means, to a first level according to the amplitude control signal; and a minimum level limiting means for limiting negative peaks of the respective vector components of the second vector base band signal, after the amplitude of the second vector base band signal has been controlled by the automatic gain control means, to a second level according to the amplitude control signal.

13. A transmission system according to claim 1, wherein said data signal point generation means of the transmitter comprises a Trellis-coded modulation means for receiving the serial digital data signal, and generating the first vector base band signal in a vector signal space, based on the block series of samples of the received serial digital data signal, representing the data signal point with coded bits including at least one redundant bit in accordance with Trellis-coded modulation.

14. A transmission system according to claim 13, wherein said decision means of said receiver determines to which one of the plurality of predetermined data signal points in the vector signal space the regenerated superimposed vector base band signal corresponds, in accordance with a soft decision.

15. A transmission system according to claim 14, wherein said demodulator means is a demodulator and equalizer means, and said receiver further comprises a delay means, provided between the demodulator and equalizer means and the vector signal subtracter means, for delaying the superimposed vector base band signal outputted from the demodulator and equalizer means to compensate for a delay caused in the decision means.

16. A transmission system according to claim 1, wherein said transmitter further comprises: a sector decision means, connected to an output of the data signal point generation means, for detecting sector information indicating in which sector in the signal space the data signal point generated by the data signal point generation means is located to generate a sector information vector signal including the sector information; and a first multiplier, provided between the base band transformation means and the vector signal superimposing means, for receiving the second vector base band signal and the sector information vector, and multiplying the second vector base signal by the sector information vector signal to supply a multiplied signal to the vector signal superimposing means instead of the second vector base band signal; and said receiver further comprises: a sector information detecting means, connected to an output of the sector decision means, for detecting the sector information, and generating a complex conjugate vector signal of the sector information vector; and a second multiplier, provided between the vector signal subtracter means and the passband transformation means, for receiving the output of the vector signal subtracter means and the complex conjugate vector signal, and multiplying an output of the vector signal subtracter means by the complex conjugate vector signal to supply a multiplied signal to the passband transformation means instead of the output of the vector signal subtracter means.

17. A transmission system comprising a transmitter; a receiver; and an analog transmission line interconnecting the transmitter and the receiver; said transmitter comprising: a base band transformation means for receiving an analog signal in the form of a passband signal and transforming the analog signal into a first vector base band signal; a time division multiplex means; a vector signal superimposing means; a signal information division means for receiving the first vector base band signal and dividing information included in the first vector base band signal into first and second portions, wherein the first portion of the information is supplied to the time division multiplex means as a first digital signal, and the second portion of the information is supplied to the vector signal superimposing means as a second vector base band signal; a data signal point generation means; said time division multiplex means having first and second signal input ports and at least one signal output port, for receiving the first digital signal from the signal information division means through the first signal input port, and a second digital signal through the second signal input port, and multiplexing the first and second digital signals to supply a multiplexed digital signal to the data signal point generation means; the data signal point generation means receiving the multiplexed digital signal and generating a third vector base band signal representing a data signal point in a vector signal space, based on a block of samples of the received multiplexed digital signal, wherein the generated data signal point is one of a plurality of predetermined data signal points in the vector signal space; the vector signal superimposing means superimposing a plurality of vector components of the second vector base band signal on a plurality of vector components of the third vector base band signal, component by component, to generate a superimposed vector base band signal; and a modulation means for modulating the superimposed vector base band signal to generate an analog modulated signal first digital signal to be transmitted through an analog transmission line; and said receiver comprising: a demodulator means for receiving the analog modulated signal transmitted through the analog transmission line and demodulating the analog modulated signal to regenerate the superimposed vector base band signal; a decision means for receiving the regenerated superimposed vector base band signal, and determining to which one of the plurality of predetermined data signal points in the vector signal space the regenerated superimposed vector base band signal corresponds, to regenerate the third vector base band signal; a code transformation means receiving the third vector base band signal, and transforming the third vector base band signal to the multiplexed digital signal to regenerate the multiplexed digital signal; a signal synthesis means; a vector signal subtractor means for receiving the regenerated superimposed vector base band signal and the regenerated third vector base band signal, and subtracting a plurality of vector components of the third vector base band signal from a plurality of vector components of the superimposed vector base band signal, component by component, to regenerate the respective vector components of the second vector base band signal, wherein the regenerated second vector base band signal is supplied to said signal synthesis means; a time division demultiplex means for receiving the regenerated multiplexed digital signal, and demultiplexing the regenerated multiplexed digital signal to regenerate the first and second digital signals, wherein the regenerated first digital signal is supplied to the signal synthesis means; a passband signal transformation means; the signal synthesis means receiving the regenerated second vector base band signal and the regenerated first digital signal, and synthesizing these signals to regenerate the first vector base band signal, wherein the regenerated first vector base band signal is supplied to the passband transformation means; and the passband signal transformation means receiving the regenerated first base band signal, and transforming the regenerated first base band signal to the analog signal in the form of the passband signal.

18. A transmission system according to claim 17, wherein the signal information division means of said transmitter comprises: an amplitude quantization means for extracting information on an amplitude of the analog passband signal inputted into the base band transformation means, quantizing the amplitude, and supplying a quantized value of the amplitude to the time division multiplex means as the first digital signal; and a remainder information signal generation means for receiving the first vector base band signal from the base band transformation means, and generating the second vector base band signal which includes all the information carried by the analog passband signal, other than the amplitude of the analog passband signal; and said time division demultiplex means of the receiver receiving the regenerated multiplexed digital signal to separate the first digital signal from the second digital signal; and the receiver further comprising: an inverse quantization means for receiving the separated first digital signal from said time division demultiplex means and inversely quantizing the first digital signal to regenerate information on the amplitude of the analog passband signal, and supplying the regenerated information on the amplitude to the signal synthesis means; and said signal synthesis means receiving information on the amplitude from the inverse quantization means, and the regenerated second vector base band signal from the vector signal subtracter, and regenerating the first base band signal based on the regenerated information on the amplitude and the regenerated second vector base band signal.

19. A transmission system according to claim 18, wherein the remainder information signal generation means of said transmitter comprises a normalization means for receiving and normalizing the second vector base band signal before supplying the second vector base band signal to the vector signal superimposing means.

20. A transmission system according to claim 18, wherein the amplitude quantization means of said transmitter extracts a maximum amplitude of the amplitude of the analog passband signal for predetermined period as the information on the amplitude of the analog passband signal.

21. A transmission system according to claim 18, wherein the amplitude quantization means in said transmitter non-linearly quantizes the amplitude.

22. A transmission system according to claim 17, wherein said demodulator means comprises an equalizer means for equalizing the analog modulated signal after demodulating to regenerate the superimposed vector base band signal.

23. A transmission system according to claim 22, wherein said transmitter further comprises a random transformation means, provided between the signal information division means and the vector signal superimposing means, for receiving the second vector base band signal from the signal information division means, and shifting a phase of the second base band signal by random phase shift values, to generate and supply to the vector signal superimposing means a randomly transformed second vector base band signal so that the frequency spectrum of the second vector base band signal uniformly spreads over a whole frequency band; said vector signal superimposing means receiving the randomly transformed second vector base band signal, superimposing a plurality of vector components of the randomly transformed second vector base band signal, instead of the second vector base band signal, on a plurality of vector components of the first vector base band signal, component by component to generate a superimposed vector base band signal.

24. A transmission system according to claim 23, wherein said demodulator means regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; said receiver further comprising an inverse random transformation means for inversely shifting the phase, which is randomly shifted by the random transformation means in the transmitter, of the randomly transformed second vector base band signal to regenerate and supply to the signal synthesis means the second vector base band signal.

25. A transmission system according to claim 24, wherein said time division multiplex means further comprises a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means.

26. A transmission system according to claim 25, wherein said time division demultiplex means further comprises a descrambler means for descrambling a scrambled digital data signal to regenerate the digital data signal.

27. A transmission system according to claim 24, wherein said transmitter further comprises: a sector decision means, connected to the output of the data signal point generation means, for detecting sector information indicating in which sector in the signal space the determined data signal point is located to generate a sector information vector signal including the sector information; and a first multiplier, provided between the random transformation means and the vector signal superimposing means, for receiving the output of the random transformation means and the sector information vector, and multiplying the second vector base band signal by the sector information vector signal to supply a multiplied signal to the vector signal superimposing means instead of the second vector base band signal; and said receiver further comprising: a sector information detecting means, connected to an output of the sector decision means, for detecting the sector information, and generating a complex conjugate vector signal of the sector information vector; and a second multiplier, provided between the vector signal subtracter means and the inverse random transformation means, for receiving the output of the vector signal subtracter means and the complex conjugate vector signal, and multiplying the output of the vector signal subtracter means by the complex conjugate vector signal to supply the multiplied signal to the inverse random transformation means instead of the output of the vector signal subtracter means.

28. A transmission system comprising a transmitter; a receiver; and an analog transmission line interconnecting the transmitter and the receiver; said transmitter comprising: a plurality of base band transformation means respectively provided for a plurality of channels of analog passband signals, each of the plurality of base band transformation means receiving an analog passband signal of the channel corresponding to each of said base band transformation means and transforming the analog passband signal into a base band signal; a time division multiplex means; a plurality of quantization means respectively provided for a plurality of channels of analog passband signals, each of the plurality of quantization means receiving the respective base band signal generated by the base band transformation means provided for that channel, extracting a first portion of information for the respective channel from the received based band signal, and quantizing the first portion of information to supply the quantized first portion of information to the time division multiplex means; a plurality of remainder signal generation means respectively provided for a plurality of channels of analog passband signals, each of the plurality of remainder signal generation means receiving the base band signal from the base band transformation means provided for the respective channel, and generating a second portion of information for the respective channel based on the received base band signal; the time division multiplex means receiving the quantized first portions of information for the plurality of channels, and multiplexing first portions of information for the plurality of channels to generate a multiplexed signal; a data signal point generation means for receiving the multiplexed signal, and generating a data signal point signal representing a data signal point based on the multiplexed signal, wherein the generated data signal point is one of a plurality of predetermined data signal points in the vector signal space; a signal adder coupled to said remainder signal generation means and said data signal point generation means, for superimposing the second portion of information for the plurality of channels on the data signal point signal; and a modulation means for receiving and modulating the data signal point signal on which second portions of information are superimposed to transform the data signal point signal on which the second portions of information are superimposed, to an analog modulated signal to be transmitted to the receiver through the analog transmission line; said receiver comprising: a demodulator and equalizer means for receiving and demodulating the analog modulated signal transmitted to the transmitter; a decision means for determining the data signal point included in the signal demodulated and equalized by the demodulator and equalizer means, to regenerate the data signal point signal; a vector signal subtracter for obtaining a difference between the signal demodulated and equalized by the demodulator and equalizer means, and the data signal point signal regenerated by the decision means; a code transformation means for receiving and transforming the data signal point signal regenerated by the decision means to regenerate the multiplexed signal; a time division demultiplex means for receiving and demultiplexing the multiplexed signal to regenerate the quantized first portions of information for the plurality of channels; a plurality of signal synthesis means respectively provided for the plurality of channels, each of the plurality of signal synthesis means receiving the first and second portions of information for respective channel, and regenerating the base band signal for the channel, based on the first and second portions of information for the channel, wherein each of the plurality of signal synthesis means comprises an inverse quantization means provided for each of the plurality of channels, each of the plurality of inverse quantization means receiving and inversely quantizing the quantized first portion of information for the channel, to regenerate the first portion of information for the channel; and a passband transformation means respectively provided for the plurality of channels, each of the plurality of passband transformation means receiving the base band signal for the channel, and transforming the base band signal to regenerate the passband signal for the channel.

29. A transmission system according to claim 28, wherein said demodulator and equalizer means includes an equalizer for equalizing the analog modulated signal after demodulating to regenerate the superimposed vector base band signal.

30. A transmission system according to claim 28, each of said plurality of quantization means for each of the plurality of channels comprising: a maximum amplitude obtaining means for receiving the base band signal, and detecting a maximum amplitude during a predetermined frame cycle to generate maximum amplitude data for each frame; a phase difference data generating means for receiving the base band signal, and detecting successive phase differences of the base band signal for a plurality of symbol periods in each frame cycle to generate phase difference data for the plurality of symbol periods in each frame cycle; a maximum phase difference obtaining means for receiving the phase difference data for the plurality of symbol periods in each frame cycle, and detecting a maximum of the successive phase differences to generate maximum phase difference data for each frame; and a phase difference normalizing means for receiving the successive phase differences of the base band signal for the plurality of symbol periods in each frame cycle, and normalizing the successive phase differences of the base band signal for the plurality of symbol periods in each frame cycle using the maximum phase difference data to generate normalized phase difference data; each of said plurality of remainder signal generation means for each of the plurality of channels comprising: an amplitude obtaining means for receiving the base band signal, and detecting successive amplitudes of the base band signal for a plurality of symbol periods in each frame cycle to generate amplitude data; and a vector signal generating means for receiving the amplitude data from the amplitude obtaining means in the remainder signal generation means for said each channel, and a first bit of the phase difference data generated by the phase difference data generating means in the quantization means for said each channel, and generating a remainder vector signal having a plurality of vector components corresponding to the plurality of channels, respectively, where each vector component has an amplitude corresponding to the amplitude data, and a polarity of the vector component corresponding to the first bit of the phase difference data, to supply the remainder vector signal to the signal adder as the second portion of information; the maximum amplitude data, the maximum phase difference data, and remaining bits other than the first bit of the normalized phase difference data for each of the plurality of channels, being supplied to the time division multiplex means as the quantized first portions of information; said time division demultiplex means suplying the maximum amplitude data, the maximum phase difference data, and the remaining bits other than the first bit of the normalized phase difference data for the plurality of channels, to the signal synthesis means for the respective channels; each of said plurality of signal synthesis means for each of the plurality of channels comprising: a signal separation means for receiving the difference obtained by the vector signal subtracter, and separating the amplitude data and the first bit of the normalized phase difference data from the difference; a phase vector regenerating means for receiving the maximum phase difference data, the normalized phase difference data for said each channel from the time division demultiplex means, and the first bit of the normalized phase difference data from the signal separation means, and generating a phase vector signal having phases which are equal to phases of the base band signal based on the maximum phase difference data for said each channel, the remaining bits other than the first bit of the normalized phase difference data for said each channel, and the first bit for said each channel; and a base band signal regenerating means for receiving the phase vector signal, and the amplitude data and the first bit of the normalized phase difference data, and regenerating the base band signal for said each channel based on the phase vector signal, the amplitude data, and the first bit.

31. A transmission system according to claim 30, each of said plurality of quantization means for each of the plurality of channels comprising a frequency shifting means for shifting frequencies of the base band signal toward a larger frequency value by a predetermined frequency shift value; and each of said plurality of signal synthesis means far each of the plurality of channels comprising a frequency shifting back means for shifting frequencies of the base band signal toward a smaller frequency value by the predetermined frequency shift value.

32. A transmission system according to claim 31, wherein said transmitter further comprises a signal adder and a random transformation means, provided between the vector signal generation means and the signal adder, for receiving the second vector base band signal from the base band transformation means, and shifting the phase of the vector signal generated by the vector signal generating means by random phase shift values, to generate and supply to the signal adder the vector signal after the phase thereof being shifted; said signal adder receiving the vector signal after the phase thereof has been shifted, superimposing a plurality of vector components of the vector signal after the phase thereof being shifted, on a plurality of vector components of the data signal point signal, component by component.

33. A transmission system according to claim 32, wherein said demodulator and equalizer means regenerates the vector signal after the phase thereof has been shifted; said receiver further comprising an inverse random transformation means for inversely shifting the phase, which is randomly shifted by the random transformation means of the transmitter, of the vector signal after the phase thereof has been shifted, to regenerate and supply to the signal synthesis means, the second vector base band signal.

34. A transmission system according to claim 33, wherein said time division multiplex means further comprising a scrambler means for scrambles the serial data signal before the serial data signal is received by the data signal point generation means.

35. A transmission system according to claim 34, wherein said time division demultiplex means further comprises a descrambler means for descrambling a scrambled digital data signal to regenerate the digital data signal.

36. A transmission system according to claim 35, said transmitter further comprising: a sector decision means, connected to an output of the data signal point generation means, for detecting sector information indicating in which sector in the signal space the determined data signal point is located to generate a sector information vector signal including the sector information; and a first multiplier, provided between the random transformation means and the vector signal superimposing means, for receiving an output of the random transformation means and the sector information vector, and multiplying the second vector base band signal by the sector information vector signal to supply a multiplied signal to the vector signal superimposing means instead of the second vector base band signal; and said receiver further comprising: a sector information detecting means, connected to an output of the sector decision means, for detecting the sector information, and generating a complex conjugate vector signal of the sector information vector; and a second multiplier, provided between the vector signal subtracter means and the inverse random transformation means, for receiving the output of the vector signal subtracter means and the complex conjugate vector signal, and multiplying the output of the vector signal subtracter means by the complex conjugate vector signal to supply the multiplied signal to the inverse random transformation means instead of the output of the vector signal subtracter means.

37. A transmitter for transmitting information included in at least one analog signal, comprising: a data signal point generation means for receiving a serial digital data signal, and generating a first vector base band signal in a vector signal space, based on a block series of samples of the received serial digital data signal, wherein a generated data signal point is one of a plurality of predetermined data signal points in the vector signal space; a base band signal transformation means for receiving an analog signal in the form of an analog passband signal and transforming the analog passband signal into a second vector base band signal, a vector signal superimposing means for superimposing a plurality of vector components of the second vector base band signal on a plurality of vector components of the first vector base band signal, component by component, to generate a superimposed vector base band signal; and a modulating means for modulating the superimposed vector base band signal to generate an analog modulated signal to be transmitted through an analog transmission line.

38. A transmitter according to claim 37, and further comprising: random transformation means provided between the base band transformation means and the vector signal superimposing means, for receiving the second vector base band signal from the base band transformation means, and shifting the phase of the second base band signal by random phase shift values, to generate and supply to the vector signal superimposing means a randomly transformed second vector base band signal so that the frequency spectrum of the second vector base band signal uniformly spreads over a whole frequency band; said vector signal superimposing means receiving the randomly transformed second vector base band signal, superimposing a plurality of vector components of the randomly transformed second vector base band signal, instead of the second vector base band signal, on a plurality of vector components of the first vector base band signal, component by component to generate a superimposed vector base band signal.

39. A transmitter according to claim 38, and further comprising a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means; said data signal point generation means receiving the scrambled serial data signal instead of the serial digital data signal, and generating the first vector base band signal, based on a block series of samples of the received serial digital data signal in after being scrambled by the scrambler means.

40. A transmitter according to claim 38, wherein said random transformation means comprises: a first bit extracting means for serially receiving the output of a scrambler circuit and obtaining blocks of bits from the output of the scrambler means to be supplied to a first phase generation means; a first phase generation means for determining phase shift values according to the values of the blocks of bits supplied from the first bit extracting means, respectively, and generating random phase vector signals respectively having phases of the phase shift values; and a first multiplier means for receiving the digital base band signal from the base band transformation means and the random phase vector signals from the first phase generation means, and multiplying the digital base band signal by the random phase vector signals to generate the randomly transformed vector base band signal.

41. A transmitter according to claim 37, and further comprising an amplitude control circuit for receiving the second vector base band signal from the base band transformation means, and controlling the amplitude of the second vector base band signal so that the amplitude of the second base band signal is maintained below a predetermined level.

42. A transmitter according to claim 41, and further comprising an amplitude control signal generating means for receiving the information on the error rate and generating and supplying to the amplitude control circuit an amplitude control signal for controlling the operation of the amplitude control circuit.

43. A transmitter according to claim 42, wherein said amplitude control circuit includes: an automatic gain control means for receiving the second vector base band signal from the base band transformation means, and controlling the amplitude of the second vector base band signal according to the amplitude control signal; a maximum level limiting means for limiting positive peaks of the respective vector components of the second vector base band signal after the amplitude of the second vector base band signal is controlled by the automatic gain control means, to a first level according to the amplitude control signal; and a minimum level limiting means for limiting negative peaks of the respective vector components of the second vector base band signal after the amplitude of the second vector base band signal is controlled by the automatic gain control means, to a second level according to the amplitude control signal.

44. A transmitter according to claim 37, wherein said data signal point generation means comprises a Trellis-coded modulation means for receiving a serial digital data signal, and generating the first vector base band signal in a vector signal space, based on the block series of samples of the received serial digital data signal, representing the data signal point with coded bits including at least one redundant bit in accordance with Trellis-coded modulation.

45. A transmitter according to claim 37, and further comprising: a sector decision means, connected to an output of the data signal point generation means, for detecting sector information indicating in which sector in the signal space the data signal point generated by the data signal point generation means is located to generate a sector information vector signal including the sector information; and a first multiplier, provided between the base band transformation means and the vector signal superimposing means, for receiving the second vector base band signal and the sector information vector, and multiplying the second vector base signal by the sector information vector signal to supply a multiplied signal to the vector signal superimposing means instead of the second vector base band signal.

46. A receiver for receiving information carried by at least one analog signal, comprising: a demodulator means for receiving an analog modulated signal transmitted through an analog transmission line and demodulating the analog modulated signal to regenerate a superimposed vector base band signal generated in a transmitter; a decision means for receiving the regenerated superimposed vector base band signal and determining to which one of the plurality of predetermined data signal points in a vector signal space the regenerated superimposed vector base band signal corresponds, to regenerate a first vector base band signal generated in said transmitter; a vector signal subtracter means for receiving the regenerated superimposed vector base band signal and the regenerated first vector base band signal and subtracting a plurality of vector components of the first vector base band signal from a plurality of vector components of the superimposed vector base band signal, component by component, to regenerate the respective vector components of a second base band signal; a code transformation means for receiving the first vector base band signal, and transforming the first vector base band signal to regenerate a serial digital data signal received by said transmitter; and a passband transformation means for receiving the regenerated second base band signal, and transforming the regenerated second base band signal to regenerate the analog signal in the form of the analog passband signal.

47. A receiver according to claim 46, wherein said demodulator means comprises an equalizer means for equalizing the analog modulated signal after demodulation to regenerate the superimposed vector base band signal.

48. A receiver according to claim 47, wherein said demodulator means regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; and further comprising an inverse random transformation means for inversely shifting the phase of the randomly transformed second vector base band signal to regenerate and supply to the passband transformation means the second vector base band signal.

49. A receiver according to claim 46, wherein said code transformation means receives the first vector base band signal, and transforms the first vector base band signal to regenerate a scrambled serial digital data signal; and further comprising a descrambler means for descrambling a scrambled digital data signal to regenerate the digital data signal.

50. A receiver according to claim 46, and further comprising a signal quality detecting means for monitoring an error rate in the second digital base band signal regenerated by the vector signal subtracter means, and transmitting information on the error rate to a transmitter through a secondary channel coupled to the receiver.

51. A receiver according to claim 46, wherein said demodulator means is a demodulator and equalizer means; and further comprising a delay means, provided between the demodulator and equalizer means and the vector signal subtracter means, for delaying the superimposed vector base band signal outputted from the demodulator and equalizer means to compensate for a delay caused in the decision means.

52. A receiver according to claim 46, wherein said decision means determines to which one of the plurality of predetermined data signal points in the vector signal space the regenerated superimposed vector base band signal corresponds, in accordance with a soft decision.

53. A receiver according to claim 46, wherein said demodulator means regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; and further comprising an inverse random transformation means for inversely shifting a phase, of randomly transformed second vector base band signal to regenerate and supply to the passband transformation means the second vector base band signal; said code transformation means receiving the first vector base band signal to regenerate a scrambled serial digital data signal; and further comprising a descrambler means for descrambling the scrambled digital data signal to regenerate the digital data signal; and said inverse random transformation means comprising: a bit extracting means for serially receiving the output of the scrambler means, and obtaining blocks of bits from the output of the code transformation means to be supplied to the second phase generating means; phase generation means for determining phase shift values according to the values of the blocks of bits supplied from the second bit extracting means, respectively, and generating random phase vector signals respectively having phases of the phase shift values; and a multiplier for receiving the second digital base band signal from the vector signal subtracter means and the random phase vector signals from the phase generation means, and multiplying the second digital base band signal by the random phase vector signals to perform inversely random transformation for the randomly transformed vector base band signal and obtain the vector base band signal before the random transformation.

54. A receiver according to claim 46, and further comprising: a sector information detecting means for detecting a sector information, and generating a complex conjugate vector signal of a sector information vector; and a multiplier, provided between the vector signal subtracter means and the passband transformation means, for receiving the output of the vector signal subtracter means and the complex conjugate vector signal, and multiplying an output of the vector signal subtracter means by the complex conjugate vector signal to supply a multiplied signal to the passband transformation means instead of the output of the vector signal subtracter means.

55. A transmitter for transmitting information carried by at least one analog signal, comprising: a base band transformation means for receiving an analog signal in the form of a passband signal and transforming the analog signal into a first vector base band signal; a time division multiplex means; a vector signal superimposing means; a signal information division means for receiving the first vector base band signal and dividing information included in the first vector base band signal into first and second portions, wherein the first portion of the information is supplied to the time division multiplex means as a first digital signal, and the second portion of the information is supplied to the vector signal superimposing means as a second vector base band signal; a data signal point generation means; said time division multiplex means having first and second signal input ports and at least one signal output port, for receiving the first digital signal from the signal information division means through the first signal input port, and a second digital signal through the second signal input port, and multiplexing the first and second digital signals to supply a multiplexed digital signal to the data signal point generation means; the data signal point generation means receiving the multiplexed digital signal and generating a third vector base band signal representing a data signal point in a vector signal space, based on a block of samples of the received multiplexed digital signal, wherein the generated data signal point is one of a plurality of predetermined data signal points in the vector signal spaces; the vector signal superimposing means superimposing a plurality of vector components of the second vector base band signal on a plurality of vector components of the third vector base band signal, component by component, to generate a superimposed vector base band signal; and a modulation means for modulating the superimposed vector base band signal to generate an analog modulated signal to be transmitted through an analog transmission line.

56. A transmitter according to claim 55, wherein the signal information division means comprises: an amplitude quantization means for extracting information on an amplitude of the analog passband signal input into the base band transformation means, quantizing the amplitude, and supplying the quantized value of the amplitude to the time division multiplex means as the first digital signal; and a remainder information signal generation means for receiving the first vector base band signal from the base band transformation means, and generating the second vector base band signal which includes all the information carried by the analog passband signal, other than the amplitude of the analog passband signal.

57. A transmitter according to claim 56, wherein the remainder information signal generating means comprises a normalization means for receiving and normalizing the second vector base band signal before supplying the second vector base band signal to the vector signal superimposing means.

58. A transmitter according to claim 56, wherein the amplitude quantization means extracts a maximum amplitude of the amplitude of the analog passband signal for a predetermined period as the information on the amplitude of the analog passband signal.

59. A transmitter according to claim 56, wherein the amplitude quantization means non-linearly quantizes the amplitudes.

60. A transmitter according to claim 55, wherein said time division multiplex means further comprises a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means.

61. A transmitter according to claim 55, and further comprising: random transformation means provided between the base band transformation means and the vector signal superimposing means; a sector decision means, connected to the output of the data signal point generation means, for detecting sector information indicating which sector in the signal space the determined data signal point is located on the signal space to generate a sector information vector signal including the sector information, and a multiplier, provided between the random transformation means and the vector signal superimposing means, for receiving the output of the random transformation means and the sector information vector, and multiplying the second vector base band signal by the sector information vector signal to supply the multiplied signal to the vector signal superimposing means instead of the second vector base band signal.

62. A transmitter for transmitting information carried by at least one analog signal, comprising: a plurality of base band transformation means respectively provided for a plurality of channels of analog passband signals, each of the plurality of base band transformation means receiving an analog passband signal of the channel corresponding to each of said base band transformation means and transforming the analog passband signal into a base band signal; a time division multiplex means; a plurality of quantization means respectively provided for a plurality of channels of analog passband signals, each of the plurality of quantization means receiving the respective base band signal generated by the base band transformation means provided for that channel, extracting a first portion of information for the respective channel from the received base band signal, and quantizing the first portion of information to supply the quantized first portion of information to the time division multiplex means; a plurality of remainder signal generation means respectively provided for a plurality of channels of analog passband signals, each of the plurality of remainder signal generation means receiving the base band signal from the base band transformation means provided for the respective channel, and generating a second portion of the information for the respective channel based on the received base band signal; a time division multiplex means receiving the quantized first portions of information for the plurality of channels, and multiplexing first portions of information for the plurality of channels to generate a multiplexed signal; a data signal point generation means for receiving the multiplexed signal, and generating a data signal point signal representing a data signal point based on the multiplexed signal, wherein the generated data signal point is one of a plurality of predetermined data signal points in the vector signal space; a signal adder coupled to said plurality of remainder signal generation means and said data signal point generation means, for superimposing the second portion of information for the plurality of channels on the data signal point signal; and a modulation means for receiving and modulating the data signal point signal on which second portions of information are superimposed to transform the data signal point signal on which the second portions of information are superimposed, to an analog modulated signal to be transmitted to a receiver through an analog transmission line.

63. A transmitter according to claim 62, wherein each of said plurality of quantization means for each of the plurality of channels comprises: a maximum amplitude obtaining means for receiving the base band signal, and detecting a maximum amplitude during a predetermined frame cycle to generate maximum amplitude data for each frame; a phase difference data generating means for receiving the base band signal, and detecting successive phase differences of the base band signal for a plurality of symbol periods in each frame cycle to generate phase difference data for the plurality of symbol periods in each frame cycle; a maximum phase difference obtaining means for receiving the phase difference data for the plurality of symbol periods in each frame cycle, and detecting a maximum of the successive phase differences to generate maximum phase difference data for each frame; and a phase difference normalizing means for receiving the successive phase difference of the base band signal for the plurality of symbol periods in each frame cycle, and normalizing the successive phase differences of the base band signal for the plurality of symbol periods in each frame cycle using the maximum phase difference data to generate normalized phase difference data; each of said plurality of remainder signal generation means for each of the plurality of channels comprising: an amplitude obtaining means for receiving the base band signal, and detecting successive amplitudes of the base band signal for a plurality of symbol periods in each frame cycle to generate amplitude data; and a vector signal generating means for receiving the amplitude data from the amplitude obtaining means of the remainder signal generation means for said each channel, and a first bit of the phase difference data generated by the phase difference data generating means in the quantization means for said each channel, and generating a remainder vector signal having a plurality of vector components corresponding to the plurality of channels, respectively, where each vector component has an amplitude corresponding to the amplitude data, and a polarity of the vector component corresponding to the first bit of the phase difference data, to supply the remainder vector signal to the signal adder as the second portion of information; the maximum amplitude data, the maximum phase difference data, and remaining bits other than the first bit of the normalized phase difference data for each of the plurality of channels, being supplied to the time division multiplex means as the quantized first portions of information.

64. A transmitter according to claim 63, wherein each of said plurality of quantization means for each of the plurality of channels comprises a frequency shifting means for shifting frequencies of the base band signal toward a larger frequency value by a predetermined frequency shift value.

65. A transmitter according to claim 64, and further comprising a random transformation means, provided between the vector signal generation means and the signal adder, for receiving the second vector base band signal from the base band transformation means, and shifting the phase of the vector signal generated by the vector signal generating means by random phase shift values, to generate and supply to the signal adder the vector signal after the phase thereof has been shifted; said signal adder receiving the vector signal after the phase thereof has been shifted, superimposing a plurality of vector components of the vector signal after the phase thereof has been shifted, on a plurality of vector components of the data signal point signal, component by component.

66. A transmitter according to claim 65, wherein said time division multiplex means further comprises a scrambler means for scrambling the serial data signal before the serial data signal is received by the data signal point generation means.

67. A transmitter according to claim 66, and further comprising: a sector decision means, connected to the output of the data signal point generation means, for detecting sector information indicating which sector in the signal space the determined data signal point is located on the signal space to generate a sector information vector signal including a sector information; and a first multiplier, provided between the random transformation means and the vector signal superimposing means, for receiving the output of the random transformation means and the sector information vector, and multiplying the second vector base band signal by the sector information vector signal to supply the multiplied signal to the vector signal superimposing means instead of the second vector base band signal.

68. A transmitter according to claim 62, and further comprising: random transformation means, provided between the signal information division means and the vector signal superimposing means, for receiving the second vector base band signal from the signal information division means, and shifting the phase of the second base band signal by random phase shift values, to generate and supply to the vector signal superimposing means a randomly transformed second vector base band signal so that the frequency spectrum of the second vector base band signal uniformly spreads over a whole frequency band; said vector signal superimposing means receiving the randomly transformed second vector base band signal, superimposing a plurality of vector components of the randomly transformed second vector base band signal, instead of the second vector base band signal, on a plurality of vector components of the first vector base band signal, component by component to generate a superimposed vector base band signal.

69. A receiver for receiving information carried by at least one analog signal, comprising: a demodulator means for receiving an analog modulated signal transmitted through an analog transmission line and demodulating the analog modulated signal to regenerate a superimposed vector base band signal; a decision means for receiving the regenerated superimposed vector base band signal and determining to which one of a plurality of predetermined data signal points in the vector signal space the regenerated superimposed vector base band signal corresponds, to regenerate a first vector base band signal; a code transformation means receiving the first vector base band signal, and transforming the first vector base band signal to a multiplexed digital signal to regenerate the multiplexed digital signal; a signal synthesis means; a vector signal subtracter means for receiving the regenerated superimposed vector base band signal and the regenerated first vector base band signal, and subtracting a plurality of vector components of the first vector base band signal from a plurality of vector components of the superimposed vector base band signal, component by component, to regenerate the respective vector components of a second base band signal, wherein the regenerated second vector base band signal is supplied to said signal synthesis means; a passband signal transformation means; the signal synthesis means receiving the regenerated second vector base band signal and the regenerated first digital signal, and synthesizing these signals to regenerate the third vector base band signal, wherein the regenerated third vector base band signal is supplied to the passband transformation means; and a passband signal transformation means receiving the regenerated third base band signal, and transforming the regenerated third base band signal to the analog signal in the form of the analog passband signal.

70. A receiver according to claim 69, and further comprising: inverse quantization means for inversely quantizing the first digital signal to regenerate information on the amplitude of the analog passband signal, and supplying the regenerated information on the amplitude to the signal synthesis means; and said signal synthesis means receiving the information on the amplitude from the inverse quantization means, and the regenerated second vector base band signal from the vector signal subtracter, and regenerating the third base band signal based on the regenerated information on the amplitude and the regenerated second vector base band signal.

71. A receiver according to claim 69, wherein said demodulator means comprises an equalizer means for equalizing the analog modulated signal after demodulation to regenerate the superimposed vector base band signal.

72. A receiver according to claim 69, wherein said demodulator means regenerates the randomly transformed second vector base band signal instead of the superimposed vector base band signal; and further comprising an inverse random transformation means for inversely shifting the phase of the randomly transformed second vector base band signal to regenerate and supply to the signal synthesis means the second vector base band signal.

73. A receiver according to claim 72, wherein said time division demultiplex means further comprises a descrambler means for descrambling the scrambled digital data signal to regenerate the digital data signal.

74. A receiver according to claim 72, and further comprising: a sector information detecting means, connected to an output of the decision means, for detecting the sector information, and generating a complex conjugate vector signal of the sector information vector; and a multiplier, provided between the vector signal subtracter means and inverse random transformation means, for receiving the output of the vector signal subtracter means and the complex conjugate vector signal, and multiplying the output of the vector signal subtracter means by the complex conjugate vector signal to supply the multiplied signal to the inverse random transformation means instead of the output of the vector signal subtracter means.

75. A receiver for receiving at least one analog signal, comprising: a demodulator and equalizer means for receiving and demodulating an analog modulated signal to be transmitted to a transmitter; a decision means for determining the data signal point included in the signal demodulated and equalized by the demodulator and equalizer means, to regenerate the data signal point signal; a vector signal subtracter for obtaining a difference between the signal demodulated and equalized by the demodulator and equalizer means, and the data signal point signal regenerated by the decision means; a code transformation means for receiving and transforming the data signal point signal regenerated by the decision means to regenerate a multiplexed signal; a time division demultiplex means for receiving and demultiplexing the multiplexed signal to regenerate the quantized first portions of information for a plurality of channels; a plurality of signal synthesis means respectively provided for the plurality of channels, each of the plurality of signal synthesis means receiving first and second portions of information for a respective channel, and regenerating a base band signal for the channel, based on the first and second portions of information for the channel, wherein each of the plurality of signal synthesis means comprises an inverse quantization means provided for each of the plurality of channels, each of the plurality of inverse quantization means receiving the quantized first portion of information for the channel, to regenerate the first portion of information for the channel; and a plurality of passband transformation means respectively provided for the plurality of channels, each of the plurality of passband transformation means receiving the base band signal for the channel, and transforming the base band signal to regenerate the analog passband signal for the channel.

76. A receiver according to claim 75, wherein said demodulator means comprises an equalizer means for equalizing the analog modulated signal after demodulation to regenerate the superimposed vector base band signal.

77. A receiver according to claim 76, wherein said time division demultiplex means supply maximum amplitude data, maximum phase difference data, and remaining bits other than a first bit of a normalized phase difference data for the plurality of channels, to the signal synthesis means for the respective channels; each of said plurality of signal synthesis means for each of the plurality of channels comprising: a signal separation means for receiving the difference obtained by the vector signal subtracter, and separating the amplitude data and the first bit of the normalized phase difference data from the difference; a phase vector regenerating means for receiving the maximum phase difference data, the normalized phase difference data for said each channel from the time division demultiplex means, and the first bit of the normalized phase difference data from the signal separation means, and generating a phase vector signal having phases which are equal to phases of the base band signal based on the maximum phase difference data for said each channel, the remaining bits other than the first bit of the normalized phase difference data for said each channel, and the first bit for said each channel; and a base band signal regenerating means for receiving the phase vector signal, and the amplitude data and the first bit of the normalized phase difference data, and regenerating the base band signal for said each channel based on the phase vector signal, the amplitude data, and the first bit.

78. A receiver according to claim 75, wherein said demodulator means regenerates the vector signal after a phase thereof being shifted; and further comprising an inverse random transformation means for inversely shifting the phase of the vector signal after the phase thereof being shifted, to regenerate and supply to the signal synthesis means the second vector base band signal.

79. A receiver according to claim 75, wherein said time division demultiplex means comprises a descrambler means for descrambling the scrambled digital data signal to regenerate the digital data signal.

80. A receiver according to claim 75, and further comprising: a sector information detecting means, connected to an output of the decision means, for detecting the sector information, and generating a complex conjugate vector signal of the sector information vector; and a multiplier, provided between the vector signal subtracter and the inverse random transformation means, for receiving the output of the vector signal subtracter and the complex conjugate vector signal, and multiplying the output of the vector signal subtracter by the complex conjugate vector signal to supply the multiplied signal to the inverse random transformation means instead of the output of the vector signal subtracter .