Multiple access system and method using a code-length division noise-spectrum protocol
First Claim
1. A reception method for detecting at least one information signal modulated on at least one repetitive waveform, the method comprising:
- coupling the repetitive waveform out of a communication channel, the repetitive waveform having at least one predetermined period, and combining at least a first time-domain sample of at least one of the repetitive waveforms with at least a second time-domain sample of at least one of the repetitive waveforms to generate at least one coherence signal indicative of the at least one information signal.
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Abstract
Multiple transmitters generate repetitive waveforms having similar values of center frequency F and bandwidth B that are modulated with different information signals having bandwidth SB. Each transmitter generates a waveform having a unique repetition rate. The modulated waveforms are coupled into a communication channel. A receiver receives and separates the transmitted signals using a coherent correlation process, such as interferometry. The combining process extracts signals having a repetition period corresponding to a relative delay applied to consecutive waveforms. Waveforms having non-corresponding repetition periods combine non-coherently, thus enabling signal demultiplexing to be performed with respect to waveform repetition periods.
26 Citations
41 Claims
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1. A reception method for detecting at least one information signal modulated on at least one repetitive waveform, the method comprising:
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coupling the repetitive waveform out of a communication channel, the repetitive waveform having at least one predetermined period, and combining at least a first time-domain sample of at least one of the repetitive waveforms with at least a second time-domain sample of at least one of the repetitive waveforms to generate at least one coherence signal indicative of the at least one information signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A reception method for separating information signals modulated onto a plurality of repetitive waveforms having different periods, the method comprising:
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coupling the waveforms out of a communication channel, generating a plurality of time-domain samples of the received waveforms having at least one time offset relative to at least one of the signal periods, and correlating the plurality of time-domain samples. - View Dependent Claims (16, 17, 18, 19, 20)
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21. In an electromagnetic-wave communication system, a transmission method for transmitting at least one information signal modulated on at least one repetitive waveform, the method comprising:
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generating at least one repetitive waveform having at least one predetermined period, modulating at least one information signal onto at least one of the waveforms, and coupling the waveforms into a communication channel. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A transmitter for transmitting at least one code-length division multiple access signal, the transmitter comprising:
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a waveform generator capable of generating a repetitive waveform having at least one predetermined period, a modulator capable of modulating at least one information signal onto at least one portion of at least one period of the repetitive waveform, and a coupler capable of coupling the modulated information signal into a communication channel. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A receiver for receiving at least one code-length division multiple access signal, the receiver comprising:
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an input coupler coupled to a communication channel capable of receiving a plurality of repetitive waveforms having at least one predetermined period, and a combiner coupled to the input coupler, the combiner capable of providing a plurality of time-domain samples of the received waveforms, at least one of the samples being time offset relative to the at least one predetermined period, the combiner capable of combining the time-domain samples for generating a coherence signal indicative of at least one information signal modulated onto at least one of the noise signals. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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Specification