Radio communication system and method of operation
First Claim
1. A method of operating a radio communication system comprising the steps of:
- selecting a plurality of carrier frequencies for a plurality of communication signals transmitted by a radio transmitter and received by a radio receiver; and
modulating information on said plurality of communication signals, said modulating being cepstral modulation.
4 Assignments
0 Petitions
Accused Products
Abstract
A new modulation/demodulation method and apparatus are described for use with RF communication. A transmitter (1001T) modulates information onto a plurality of carrier signals transmitted simultaneously over a corresponding plurality of frequencies using cepstral modulation. A receiver (1003R) receives the plurality of carrier signals and demodulates the signals utilizing cepstral demodulation. Receiver (1003R) monitors the carrier signals and in response to predetermined conditions selects a cepstral constellation to be utilized. Receiver (1003R) provides the cepstral constellation information to a transmitter (1003T) that, in turn, transmits the cepstral constellation information to a receiver (1001R), in turn, provides the cepstral constellation information to transmitter (100T). Transmitter (1001T) utilizes the selected cepstral constellation information to modulate the next transmission of the plurality of carrier signals.
37 Citations
74 Claims
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1. A method of operating a radio communication system comprising the steps of:
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selecting a plurality of carrier frequencies for a plurality of communication signals transmitted by a radio transmitter and received by a radio receiver; and
modulating information on said plurality of communication signals, said modulating being cepstral modulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A radio communication system comprising:
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a transmitter comprising a generator operable to simultaneously generate a plurality of carrier signals each at a different one of a corresponding plurality of frequencies; and
a modulator for modulating information onto said plurality of carrier signals utilizing cepstral modulation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A radio receiver, comprising:
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means for receiving a plurality of carrier signals received on a corresponding plurality of carrier frequencies, said plurality of carrier signals being modulated with cepstral modulation;
means for extracting information from said plurality of carrier signals by using cepstral demodulation on desired ones of said plurality of carrier signals; and
means for said receiver to identify undesirable ones of said plurality of carrier frequencies and to avoid demodulating carrier signals received on said undesirable ones of said plurality of carrier frequencies. - View Dependent Claims (33, 34, 35)
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36. A radio receiver, comprising:
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means for receiving a plurality of carrier signals received on a corresponding plurality of carrier frequencies, said plurality of carrier signals being modulated with cepstral modulation;
means for extracting information from said plurality of carrier signals by using cepstral demodulation on desired ones of said plurality of carrier signals;
means for identifying a cepstral constellation in accordance with a predetermined function; and
means for communicating said identified cepstral constellation to a transmitter of said plurality of carrier signals. - View Dependent Claims (37, 38)
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39. A radio receiver, comprising:
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means for receiving a plurality of carrier signals received on a corresponding plurality of carrier frequencies, said plurality of carrier signals being modulated with cepstral modulation;
means for extracting information from said plurality of carrier signals by using cepstral demodulation on desired ones of said plurality of carrier signals; and
a processor operable to identify a plurality of predetermined cepstral constellations each corresponding to a predetermined communication condition of a corresponding plurality of predetermined communications conditions;
said processor monitoring predetermined conditions of said plurality of carrier frequencies; and
said processor selecting a first cepstral constellation from said plurality of predetermined communication conditions based upon said monitored predetermined conditions of said plurality of carrier frequencies corresponding to one of said plurality of predetermined communication conditions. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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46. A radio receiver, comprising:
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means for receiving a plurality of carrier signals received on a corresponding plurality of carrier frequencies, said plurality of carrier signals being modulated with cepstral modulation;
means for extracting information from said plurality of carrier signals by using cepstral constellation on desired ones of said plurality of carrier signals; and
means for generating cepstral modulation information for transmission to a source of said plurality of carrier signals to adjust the cepstral modulation.
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47. A method of operating a radio receiver, comprising:
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receiving a plurality of carrier signals each modulated with information using cepstral modulation, said plurality of carrier signals being simultaneously received over a plurality of corresponding frequencies;
identifying certain ones of said plurality of carrier signals to be demodulated; and
demodulating said certain ones of said plurality of carrier signals to extract said information. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A method of operating a radio transmitter, comprising:
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selecting a first cepstral modulation constellation; and
transmitting a plurality of carrier signals each cepstrum modulated with information using said first cepstral modulation constellation, said plurality of carrier signals being simultaneously transmitted over a plurality of corresponding frequencies. - View Dependent Claims (59, 60)
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61. A method of operating a radio communication system comprising the steps of:
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selecting a plurality of carrier frequencies for a plurality of communication signals; and
modulating information on said plurality of communication signals, said modulating being Wastrum modulation. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69)
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70. A method of operating a radio communication system, comprising:
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selecting a plurality of carrier frequencies for a plurality of communication signals;
modulating information in said plurality of communication signals, said modulating including cepstral modulation; and
transmitting said plurality of communication signals by a radio transmitter. - View Dependent Claims (71, 72, 73, 74)
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Specification