High speed data communications system
First Claim
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1. A system for transmission and reception of a serial stream of digital data from a first location to a second location comprising:
- means at said first location for converting said serial data stream into a number N of first parallel data substreams;
a number N of modulators at said first location for modulating a plurality of component signals each with one of said parallel data substreams;
means for transmitting said modulated component signals to said second location, each of said component signals being transmitted on at least two transmission channels;
a plurality of at least 2N demodulators at said second location, each for demodulating a component signal from one of said transmission channels;
switching means at said second location for selecting the output of one of said demodulators for each of said modulated component signals, to derive a number N of second parallel data substreams, each corresponding to one of said first data substreams;
means for converting said N second parallel data substreams into an output serial data stream.
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Abstract
An improved data transmission system has a transmitter which includes a modulator responsive to a synthesized modulating signal, which provides for transmission of data substreams on parallel subchannels, for example, by using subcarrier frequencies. At the receiver the subcarriers are received and data is selected from the received subcarriers at two diverse receivers. In addition, there are provided signals added to the transmitted data for retiming the data at the receiver.
69 Citations
35 Claims
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1. A system for transmission and reception of a serial stream of digital data from a first location to a second location comprising:
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means at said first location for converting said serial data stream into a number N of first parallel data substreams; a number N of modulators at said first location for modulating a plurality of component signals each with one of said parallel data substreams; means for transmitting said modulated component signals to said second location, each of said component signals being transmitted on at least two transmission channels; a plurality of at least 2N demodulators at said second location, each for demodulating a component signal from one of said transmission channels; switching means at said second location for selecting the output of one of said demodulators for each of said modulated component signals, to derive a number N of second parallel data substreams, each corresponding to one of said first data substreams; means for converting said N second parallel data substreams into an output serial data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A receiver for use in a system having at least two different transmission channels for receiving a plurality of N component signals, each of which is transmitted on at least two of said channels, said component signals having modulation corresponding to N parallel data substreams, comprising:
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at least N first demodulators, each coupled to receive one of said component signals from one of said channels and to provide at least N first output data substreams; at least N second demodulators, each coupled to receive one of said component signals from another of said channels and to provide at least N second output data substreams; and switching means for selecting one of said first or second output data substreams for each of said N parallel data substreams in accordance with the component signals for each of said N parallel data substreams on each of said transmission channels. - View Dependent Claims (11, 12)
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13. A system for transmission and reception of a serial stream of digital data from a first location to a second location, comprising:
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means at said first location, responsive to said serial data stream, for forming a plurality of N parallel data substreams, each of said substreams comprising a series of data frames, each of said data frames including a data frame timing signal and a predetermined quantity of digital data; N modulators at said first location, each for modulating a component signal with one of said N data substreams; means for transmitting said modulated component signals to said second location; N demodulators at said second location for demodulating said modulated component signals to derive therefrom said N parallel data substreams; means responsive to said frame timing signals in said demodulated data substreams for retiming said digital data in said substreams; and means responsive to said retimed substream digital data for generating an output serial stream of digital data. - View Dependent Claims (14, 15, 16, 17, 18)
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19. In a system for transmission of a stream of digital data between remote locations, said system having signal filtering characteristics, signal forming apparatus, comprising:
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a register for storing digital data bits in said data stream in an arrangement corresponding to the order of said bits in said stream; a counter, responsive to supplied clock signals; a programmed digital data memory having first address inputs coupled to said register and second address inputs coupled to said counter and having programmed data values corresponding to sequential values of a synthesized modulating signal, said data values being selected to provide a synthesized modulating signal with a Fourier Transform dependent on said data bits in said register which compensate for said signal filtering characteristics; and a digital to analog converter responsive to data values from said memory. - View Dependent Claims (20, 21, 22)
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23. In a system for transmitting a stream of digital data between remote locations, said system having signal filtering characteristics, a modulator for modulating a supplied carrier with said data, comprising:
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a register for storing digital data bits in said data stream in an arrangement corresponding to the order of said bits in said stream; a counter, responsive to supplied clock signals; a programmed digital data memory having first address inputs coupled to said register and second address inputs coupled to said counter and having programmed data values corresponding to sequential values of a synthesized modulating signal, said data values being selected to provide a synthesized modulating signal with a Fourier Transform dependent on said data bits in said register which compensate for said signal filtering characteristics; a digital to analog converter responsive to data values from said memory for generating a modulating signal; and a modulator for modulating said carrier with said modulating signal. - View Dependent Claims (24, 25, 26)
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27. A system for transmission and reception of a serial stream of digital data from a first location to a second location and having signal filtering characteristics, comprising:
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(1) means at said first location responsive to said serial data stream, for forming a plurality of N parallel data substreams, each of said substreams comprising a series of data frames, each of said data frames including a data frame timing signal and a predetermined quantity of digital data; (2) at least N modulators, each comprising; (a) a register for storing digital data bits in one of said substreams in an arrangement corresponding to the order of said bits in said substream; (b) a counter, responsive to supplied clock signals; (c) a programmed digital data memory having first address inputs coupled to said register and second address inputs coupled to said counter and having programmed data values corresponding to sequential values of a synthesized modulating signal, said data values being selected to provide a synthesized modulating signal with a Fourier Transform dependent on said data bits in said register which compensate for said signal filtering characteristics; (d) a digital to analog converter responsive to data values from said memory; and (e) means for modulating a supplied component signal with said synthesized modulating signal; (3) means for transmitting said modulated component signals to said second location; (4) N demodulators at said second location for demodulating said modulated component signals to derive therefrom said N parallel data substreams; (5) means responsive to said frame timing signals in said demodulated data substreams for retiming said digital data in said substreams; and (6) means responsive to said retimed substream digital data for generating an output serial stream of digital data. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification