Polyopoly overlapping spread spectrum communication system and method
First Claim
1. A spread spectrum communications system for use over a communications channel, comprising:
- a first transmitter-generic-chip-code generator for generating a first generic-chip-code signal having a chip rate;
a first transmitter-message-chip-code generator for generating a first message-chip-code signal having the chip rate;
a first EXCLUSIVE-OR gate coupled to said first transmitter-message-chip-code generator for spread-spectrum processing first message data with the first message-chip-code signal to generate a first spread-spectrum signal;
a first combiner coupled to said first transmitter-generic-chip-code generator and said first EXCLUSIVE-OR gate for combining the first generic-chip-code signal with the first spread-spectrum-processed signal;
a first transmitter coupled to said first combiner for transmitting the combined first generic-chip-code signal and first spread-spectrum-processed signal, on a first carrier signal at a first carrier frequency over said communications channel as a first spread-spectrum-communications signal;
a second transmitter-generic-chip-code generator for generating a second generic-chip-code signal having the chip rate;
a second transmitter-message-chip-code generator for generating a second message-chip-code signal having the chip rate;
a second EXCLUSIVE-OR gate coupled to said second transmitter-message-chip-code generator for spread-spectrum processing second message data with the second message-chip-code signal to generate a second spread-spectrum signal;
a second combiner coupled to said second transmitter-generic-chip-code generator and said second EXCLUSIVE-OR gate for combining the second generic-chip-code signal with the second spread-spectrum-processed signal;
a second transmitter coupled to said second combiner for transmitting the combined second generic-chip-code signal and second spread-spectrum-processed signal, on a second carrier signal at a second carrier frequency offset from the first carrier frequency by the chip rate, over said communications channel as a second spread-spectrum-communications signal;
a first receiver-generic-chip-code generator for generating a replica of the first generic-chip-code signal;
a first generic mixer coupled to said first receiver-generic-chip-code generator for recovering the first carrier signal from the first spread-spectrum-communications signal as a first recovered-carrier signal;
a first receiver-message-chip-code generator coupled to said first receiver-generic-chip-code signal for generating a replica of the first message-chip-code signal;
a first message mixer coupled to said first receiver-message-chip-code generator responsive to the replica of the first message-chip-code signal for despreading the first spread-spectrum-communications signal as a first modulated-data signal;
a first message-bandpass filter coupled to said first receiver-message-mixer device for filtering the first modulated-data signal;
a first-generic-bandpass filter coupled to said first generic-mixer device for filtering the first recovered-carrier signal recovered from the first spread-spectrum-communications signal;
a first tracking and acquisition circuit coupled to an output of said first generic-bandpass filter and to said first receiver-generic-chip-code generator, said first tracking and acquisition circuit responsive to acquiring and tracking the first recovered-carrier signal for synchronizing the first generic-chip-code signal to the first recovered-carrier signal;
a first power splitter coupled between said communications channel, said first generic-mixer device and said first receiver-message-mixer device for dividing the first spread-spectrum-communications signal between said first generic-mixer device and said first receiver-message-mixer device;
a first synchronous detector coupled to said first message-bandpass filter and said first generic-bandpass filter, responsive to the first recovered-carrier signal recovered by the first generic-mixer device for synchronously demodulating the first modulated-data signal as a first detected signal;
a second receiver-generic-chip-code generator for generating a replica of the second generic-chip-code signal;
a second generic mixer coupled to said second receiver-generic-chip-code generator for recovering the second carrier signal from the second spread-spectrum-communications signal as a second recovered-carrier signal;
a second receiver-message-chip-code generator coupled to said second receiver-generic-chip-code signal and synchronized to the replica of the second generic-chip-code signal for generating a replica of the second message-chip-code signal;
a second message mixer coupled to said second receiver-message-chip-code generator responsive to the replica of the second message-chip-code signal for despreading the second spread-spectrum-communications signal as a second modulated-data signal;
a second message-bandpass filter coupled to said second receiver-message-mixer device for filtering the second modulated-data signal;
a second-generic-bandpass filter coupled to said second generic-mixer device for filtering the second recovered-carrier signal recovered from the second spread-spectrum-communications signal;
a second tracking and acquisition circuit coupled to an output of said second generic-bandpass filter and to said second receiver-generic-chip-code generator, said second tracking and acquisition circuit responsive to acquiring and tracking the second recovered-carrier signal for synchronizing the second generic-chip-code signal to the second recovered-carrier signal;
a second power splitter coupled between said communications channel, said second generic-mixer device and said second receiver-message-mixer device for dividing the second spread-spectrum-communications signal between said second generic-mixer device and said second receiver-message-mixer device; and
a second synchronous detector coupled to said second message-bandpass filter and said second generic-bandpass filter, responsive to the second recovered-carrier signal recovered by the second generic-mixer device for synchronously demodulating the second modulated-data signal as a second detected signal.
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Accused Products
Abstract
Two, three or more competitive personal communications network spread spectrum systems share spectrum without interfering with each other, without significantly decreasing the chip rate of each PCN system, and without increasing the level of interference seen by fixed service users. A duopoly of spread spectrum communications system includes a first transmitter station, a second transmitter station, a first receiver station and a second receiver station. A transmitter at the second transmitter station transmits a spread spectrum signal on a carrier frequency which is offset from the carrier frequency of the first transmitter at the transmitter station by the chip rate. A tripoly of spread spectrum communication system includes the elements of the duopoly spread spectrum system and further includes a third transmitter station and a third receiver station. A third transmitter at the third transmitter station transmits a spread spectrum signal on a carrier frequency which is offset from the first carrier frequency by twice the chip rate. The first, second and third receiver stations each have receivers which receive the respect of spread spectrum signals from the first, second and third transmitter stations. A polyopoly overlapping spread spectrum communications system may be used which allows many users to transmit and receive throughout the frequency regime.
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Citations
29 Claims
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1. A spread spectrum communications system for use over a communications channel, comprising:
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a first transmitter-generic-chip-code generator for generating a first generic-chip-code signal having a chip rate; a first transmitter-message-chip-code generator for generating a first message-chip-code signal having the chip rate; a first EXCLUSIVE-OR gate coupled to said first transmitter-message-chip-code generator for spread-spectrum processing first message data with the first message-chip-code signal to generate a first spread-spectrum signal; a first combiner coupled to said first transmitter-generic-chip-code generator and said first EXCLUSIVE-OR gate for combining the first generic-chip-code signal with the first spread-spectrum-processed signal; a first transmitter coupled to said first combiner for transmitting the combined first generic-chip-code signal and first spread-spectrum-processed signal, on a first carrier signal at a first carrier frequency over said communications channel as a first spread-spectrum-communications signal; a second transmitter-generic-chip-code generator for generating a second generic-chip-code signal having the chip rate; a second transmitter-message-chip-code generator for generating a second message-chip-code signal having the chip rate; a second EXCLUSIVE-OR gate coupled to said second transmitter-message-chip-code generator for spread-spectrum processing second message data with the second message-chip-code signal to generate a second spread-spectrum signal; a second combiner coupled to said second transmitter-generic-chip-code generator and said second EXCLUSIVE-OR gate for combining the second generic-chip-code signal with the second spread-spectrum-processed signal; a second transmitter coupled to said second combiner for transmitting the combined second generic-chip-code signal and second spread-spectrum-processed signal, on a second carrier signal at a second carrier frequency offset from the first carrier frequency by the chip rate, over said communications channel as a second spread-spectrum-communications signal; a first receiver-generic-chip-code generator for generating a replica of the first generic-chip-code signal; a first generic mixer coupled to said first receiver-generic-chip-code generator for recovering the first carrier signal from the first spread-spectrum-communications signal as a first recovered-carrier signal; a first receiver-message-chip-code generator coupled to said first receiver-generic-chip-code signal for generating a replica of the first message-chip-code signal; a first message mixer coupled to said first receiver-message-chip-code generator responsive to the replica of the first message-chip-code signal for despreading the first spread-spectrum-communications signal as a first modulated-data signal; a first message-bandpass filter coupled to said first receiver-message-mixer device for filtering the first modulated-data signal; a first-generic-bandpass filter coupled to said first generic-mixer device for filtering the first recovered-carrier signal recovered from the first spread-spectrum-communications signal; a first tracking and acquisition circuit coupled to an output of said first generic-bandpass filter and to said first receiver-generic-chip-code generator, said first tracking and acquisition circuit responsive to acquiring and tracking the first recovered-carrier signal for synchronizing the first generic-chip-code signal to the first recovered-carrier signal; a first power splitter coupled between said communications channel, said first generic-mixer device and said first receiver-message-mixer device for dividing the first spread-spectrum-communications signal between said first generic-mixer device and said first receiver-message-mixer device; a first synchronous detector coupled to said first message-bandpass filter and said first generic-bandpass filter, responsive to the first recovered-carrier signal recovered by the first generic-mixer device for synchronously demodulating the first modulated-data signal as a first detected signal; a second receiver-generic-chip-code generator for generating a replica of the second generic-chip-code signal; a second generic mixer coupled to said second receiver-generic-chip-code generator for recovering the second carrier signal from the second spread-spectrum-communications signal as a second recovered-carrier signal; a second receiver-message-chip-code generator coupled to said second receiver-generic-chip-code signal and synchronized to the replica of the second generic-chip-code signal for generating a replica of the second message-chip-code signal; a second message mixer coupled to said second receiver-message-chip-code generator responsive to the replica of the second message-chip-code signal for despreading the second spread-spectrum-communications signal as a second modulated-data signal; a second message-bandpass filter coupled to said second receiver-message-mixer device for filtering the second modulated-data signal; a second-generic-bandpass filter coupled to said second generic-mixer device for filtering the second recovered-carrier signal recovered from the second spread-spectrum-communications signal; a second tracking and acquisition circuit coupled to an output of said second generic-bandpass filter and to said second receiver-generic-chip-code generator, said second tracking and acquisition circuit responsive to acquiring and tracking the second recovered-carrier signal for synchronizing the second generic-chip-code signal to the second recovered-carrier signal; a second power splitter coupled between said communications channel, said second generic-mixer device and said second receiver-message-mixer device for dividing the second spread-spectrum-communications signal between said second generic-mixer device and said second receiver-message-mixer device; and a second synchronous detector coupled to said second message-bandpass filter and said second generic-bandpass filter, responsive to the second recovered-carrier signal recovered by the second generic-mixer device for synchronously demodulating the second modulated-data signal as a second detected signal.
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2. A spread spectrum communications system for use over a communications channel comprising:
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first message means for generating a first message-chip-code signal having a chip rate; first spreading means for spread-spectrum processing first message data with the first message-chip-code signal to generate a first spread-spectrum-processed signal; first means for transmitting the first spread-spectrum-processed signal on a first carrier signal at a first carrier frequency over said communications channel as a first spread-spectrum-communications signal; second message means for generating a second message-chip-code signal having the chip rate; second spreading means for spread-spectrum processing second message data with the second message-chip-code signal to generate a second spread-spectrum-processed signal; second means for transmitting the second spread-spectrum-processed signal on a second carrier signal at a second carrier frequency offset from the first carrier frequency by the chip rate over said communications channel as a second spread-spectrum-communications signal; first message-spread-spectrum-processing means for despreading the first spread-spectrum-communications signal as a first modulated-data signal; first detection means for detecting the first modulated-data signal as a first detected signal; first bit-synchronization means for synchronously converting the first detected signal as first received data; second message-spread-spectrum-processing means for despreading the second spread-spectrum-communications signal as a second modulated-data signal; second detection means for detecting the second modulated-data signal as a second detected signal; and second bit-synchronization means responsive to the second generic-chip-code signal for synchronously converting the second detected signal as second received data. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A method for synchronously demodulating spread spectrum communications, comprising the steps of:
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generating a first message-chip-code signal having a chip rate; spread-spectrum processing first message data with the first message-chip-code signal to generate a first spread-spectrum-processed signal; transmitting the first spread-spectrum-processed signal on a first carrier signal at a first carrier frequency over said communications channel as a first spread-spectrum-communications signal; generating a second message-chip-code signal having the chip rate; spread-spectrum processing second message data with the second message-chip-code signal to generate a second spread-spectrum-processed signal; transmitting the second spread-spectrum-processed signal on a second carrier signal at a second carrier frequency offset from the first carrier frequency by the chip rate over said communications channel as a second spread-spectrum-communications signal; generating a replica of the first message-chip-code signal synchronized to the replica of the first generic-chip-code signal; despreading, using the replica of the first message-chip-code signal, the first spread-spectrum-communication signal as a first modulated-data signal; demodulating the first modulated-data signal as first received data; generating a replica of the second message-chip-code signal synchronized to the replica of the second generic-chip-code signal; despreading, using the replica of the second message-chip-code signal, the second spread-spectrum-communications signal as a second modulated-data signal; and demodulating the second modulated-data signal as second received data. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A spread spectrum communication system for use over a communications channel, comprising:
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first generic means for generating a first generic-chip-code signal; a first plurality of message means for generating a first plurality of message-chip-code signals; a first plurality of spreading means for spread-spectrum processing the first plurality of message data with the first plurality of message-chip-code signals to generate a first plurality of spread-spectrum-processed signals; first summer means for combining the first generic-chip-code signal with the first plurality of spread-spectrum-processed signals; first means for transmitting the combined first generic-chip-code signal and the first plurality of spread-spectrum-processed signals, on a first carrier signal at a first carrier frequency over said communications channel as a first spread-spectrum-communications signal; second generic means for generating a second generic-chip-code signal; a second plurality of message means for generating a second plurality of message-chip-code signals; a second plurality of spreading means for spread-spectrum processing the second plurality of message data with the second plurality of message-chip-code signals to generate a second plurality of spread-spectrum-processed signals; second summer means for combining the second generic-chip-code signal with the second plurality of spread-spectrum-processed signals; second means for transmitting the combined second generic-chip-code signal and the second plurality of spread-spectrum-processed signals, on a second carrier signal at a second carrier frequency over said communications channel as a second spread-spectrum-communications signal; first generic-spread-spectrum-processing means for recovering the first carrier signal from the first spread-spectrum-communications signal as a first recovered-carrier signal, and for generating a replica of the first generic-chip-code signal; first acquisition means responsive to acquiring and tracking the first recovered-carrier signal for synchronizing said first generic-spread-spectrum-processing means to the first recovered-carrier signal; a first plurality of message-spread-spectrum-processing means synchronized to the replica of the first generic-chip-code signal for despreading the first spread-spectrum-communications signal as a first plurality of modulated-data signals; a first plurality of detection means for detecting the first plurality of modulated-data signals as a first plurality of detected signals; second generic-spread-spectrum-processing means for recovering the second carrier signal from the second spread-spectrum-communications signal as a second recovered-carrier signal, and for generating a replica of the second generic-chip-code signal; second acquisition means responsive to acquiring and tracking the second recovered-carrier signal for synchronizing said second generic-spread-spectrum-processing means to the second recovered-carrier signal; a second plurality of message-spread-spectrum-processing means synchronized to the replica of the second generic-chip-code signal for despreading the second spread-spectrum-communications signal as a second plurality of modulated-data signals; and a second plurality of detection means of detecting the second plurality of modulated-data signals as a second plurality of detected signals. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification