Spread spectrum conferencing communication system
First Claim
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1. A multiple subscriber random access spread spectrum conferencing communication system comprising:
- means for receiving spread spectrum messages in a plurality of channels;
means for detecting said messages and for generating a first signal in each channel in response thereto;
correlation means associated with each channel for correlating said messages with a pseudonoise sequence and for generating a control signal in response thereto;
multiplexing means for assigning a particular channel to said message when said first signal and said control signal in one channel are time coincident and for locking out said other channels not having said time coincidence from said message; and
means associated with each of said channels for decoding said message.
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Abstract
An anti-jam PN sequence spread spectrum conferencing communication system is disclosed for simultaneously transmitting and receiving in a plurality of communications channels secure voice communications. All received messages are modulated with the same pseudo noise sequence and arrive at any given channel at random time states, wherein the messages are separated, separately processed and finally conferenced, using a technique based upon the correlation of the PN sequence and dependent upon the randomness of the epoch state of a given PN sequence coded with a message in relation to the other coded messages.
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Citations
15 Claims
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1. A multiple subscriber random access spread spectrum conferencing communication system comprising:
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means for receiving spread spectrum messages in a plurality of channels; means for detecting said messages and for generating a first signal in each channel in response thereto; correlation means associated with each channel for correlating said messages with a pseudonoise sequence and for generating a control signal in response thereto; multiplexing means for assigning a particular channel to said message when said first signal and said control signal in one channel are time coincident and for locking out said other channels not having said time coincidence from said message; and means associated with each of said channels for decoding said message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A multiple channel spread spectrum receiver for conferencing incoming PN coded spread spectrum messages in a plurality of channels, each channel comprising:
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correlation means for despreading said messages; means for detecting the instantaneous state of said PN code and having an output; parallel correlation means for detecting said messages and having an output; means responsive to the outputs of said last two mentioned means when said outputs are coincident in time for gating said message into one channel only and inhibiting said other channels from processing said message; and means for assigning channel priority for later received messages in said inhibited channels.
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Specification