Spread-spectrum communications utilizing variable throughput reduction
First Claim
1. A communications system comprising:
- a transmitter, including, a demultiplexer for demultiplexing input data into a plurality of data channels;
a plurality of forward-error-correction encoders and interleavers, coupled to said demultiplexer, for FEC encoding and interleaving the plurality of data channels as a plurality of FEC encoded and interleaved channels, respectively;
a plurality of processors, coupled to said plurality of FEC encoders and interleavers, for processing the plurality of FEC encoded and interleaved channels as a plurality of modulated channels;
a combiner coupled to said plurality of processors, for combining the plurality of modulated channels as a multiplexed signal;
a receiver, including, a plurality of demodulators for demodulating the multiplexed signal into a plurality of demodulated channels, respectively;
a multiplicity of FEC decoder and de-interleavers, coupled to said plurality of demodulators for FEC decoding and de-interleaving the multiplicity of demodulated channels, as a multiplicity of decoded demodulated channels; and
a multiplexer, coupled to said plurality of FEC decoders and de-interleavers, for multiplexing the multiplicity of decoded channels.
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Accused Products
Abstract
A spread-spectrum system having a transmitted data rate determined by an error rate syndrome at a spread-spectrum receiver. Data are demultiplexed into a plurality of data channels, and spread-spectrum processed as a plurality of spread-spectrum channels. A combiner combines the plurality of spread-spectrum channels as a code-division-multiplexed signal. At a receiver, the code-division-multiplexed signal is despread into a plurality of despread channels. A multiplicity of adders, which is electronically controlled by an adder-control signal, adds several of the despread channels to generate a multiplicity of added channels. A syndrome signal is generated from an error rate of the multiplicity of added channels. From the syndrome signal, a desired-data rate is determined for the spread-spectrum transmitter.
42 Citations
30 Claims
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1. A communications system comprising:
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a transmitter, including, a demultiplexer for demultiplexing input data into a plurality of data channels;
a plurality of forward-error-correction encoders and interleavers, coupled to said demultiplexer, for FEC encoding and interleaving the plurality of data channels as a plurality of FEC encoded and interleaved channels, respectively;
a plurality of processors, coupled to said plurality of FEC encoders and interleavers, for processing the plurality of FEC encoded and interleaved channels as a plurality of modulated channels;
a combiner coupled to said plurality of processors, for combining the plurality of modulated channels as a multiplexed signal;
a receiver, including, a plurality of demodulators for demodulating the multiplexed signal into a plurality of demodulated channels, respectively;
a multiplicity of FEC decoder and de-interleavers, coupled to said plurality of demodulators for FEC decoding and de-interleaving the multiplicity of demodulated channels, as a multiplicity of decoded demodulated channels; and
a multiplexer, coupled to said plurality of FEC decoders and de-interleavers, for multiplexing the multiplicity of decoded channels. - View Dependent Claims (21, 22, 23)
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2-20. -20. (canceled)
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24. A communications system comprising:
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a transmitter, including, demultiplexer means for demultiplexing input data into a plurality of data channels;
encoder means for FEC encoding and interleaving the plurality of data channels as a plurality of FEC encoded and interleaved channels, respectively;
processor means for processing the plurality of FEC encoded and interleaved channels as a plurality of modulated channels;
combiner means for combining the plurality of modulated channels as a multiplexed signal;
a receiver, including, demodulator means for demodulating the multiplexed signal into a plurality of demodulated channels, respectively;
decoder means for FEC decoding and de-interleaving the multiplicity of demodulated channels, as a multiplicity of decoded channels; and
multiplexer means for multiplexing the multiplicity of decoded channels. - View Dependent Claims (25, 26, 27)
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28. A communications method comprising the steps of:
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demultiplexing input data into a plurality of data channels;
FEC encoding and interleaving the plurality of data channels as a plurality of FEC encoded and interleaved channels, respectively;
processing the plurality of FEC encoded and interleaved channels as a plurality of modulated channels;
combining the plurality of channels as a multiplexed signal;
transmitting the multiplexed signal having the plurality of modulated channels, over a communications channel;
demodulating the multiplexed signal into a plurality of demodulated channels, respectively;
FEC decoding and de-interleaving the plurality of demodulated channels, as a multiplicity of decoded channels;
generating a syndrome signal from an error rate of the multiplicity of decoded channels; and
multiplexing the multiplicity of decoded channels. - View Dependent Claims (29, 30)
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Specification