US 6,289,039 B1Granted

Spread-spectrum communications utilizing variable throughput reduction

AssigneeLinex Technologies, Inc.

InventorJoseph Garodnick

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Abstract

A spread-spectrum system having a transmitted data rate determined by an error rate syndrome at a spread-spectrum receiver. A demultiplexer demultiplexes input data into a plurality of data channels. A plurality of FEC encoders FEC encodes the plurality of data channels, as a plurality of FEC encoded channels. A plurality of spread-spectrum processors spread-spectrum processes the plurality of FEC encoded channels as a plurality of spread-spectrum channels. The plurality of spread-spectrum channels preferably uses a plurality of orthogonal or quasi-orthogonal chip-sequence signals to define a particular spread-spectrum channel. A combiner combines the plurality of spread-spectrum channels as a code-division-multiplexed signal. At a receiver, a plurality of spread-spectrum despreaders despreads the code-division-multiplexed signal into a plurality of despread channels. A multiplicity of adders is electronically controlled by an adder-control signal. The multiplicity of adders adds several of the despread channels to generate a multiplicity of added channels. A multiplicity of FEC decoders generates a syndrome signal from an error rate of the multiplicity of added channels. A command processor determines, from the syndrome signal, a desired-data rate, and generates a data-rate command signal having the desired-data rate for the spread-spectrum transmitter. The command processor also generates the adder-control signal for adding together a number of despread channels of the plurality of despread channels, and generates a multiplexer signal having a number of decoded channels to multiplex together. The multiplexer multiplexes the multiplicity of decoded channels to generate an estimate of the input data.

Claims20

Dependent claims

A spread-spectrum system comprising:

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 spread-spectrum processors, coupled to said plurality of FEC encoders and interleavers, for spread-spectrum processing the plurality of FEC encoded and interleaved channels as a plurality of spread-spectrum channels, employing a plurality of chip-sequence signals;
a combiner coupled to said plurality of spread-spectrum processors, for combining the plurality of spread-spectrum channels as a code-division-multiplexed signal;
a modulator for transmitting the code-division-multiplexed signal having the plurality of spread-spectrum channels, over a communications channel;
a demodulator for translating the code-division-multiplexed signal to a processing frequency;
a plurality of spread-spectrum despreaders for despreading the code-division-multiplexed signal into a plurality of despread channels, respectively;
a multiplicity of adders, electronically controlled by an adder-control signal, for adding at least two despread channels to generate a multiplicity of added channels;
a multiplicity of FEC decoder and de-interleavers, coupled to said multiplicity of adders, for generating a syndrome signal from an error rate of the multiplicity of added channels, and for FEC decoding and de-interleaving the multiplicity of added channels, and a multiplicity of decoded channels;
a command processor, responsive the syndrome signal, for determining a desired-data rate, for generating a data-rate command signal having the desired data rate, for generating the adder-control signal for adding together a number of despread channels of the plurality of despread channels, and for generating a multiplexer signal having a number of decoded channels to multiplex together;
and
a multiplexer, coupled to said plurality of FEC decoders and de-interleavers and said command processor, for multiplexing the multiplicity of decoded channels and an estimate of the input data.

9 more elements

A spread-spectrum system comprising:

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;
spreader means for spread-spectrum processing the plurality of FEC encoded and interleaved channels as a plurality of spread-spectrum channels, having a plurality of chip-sequence signals;
combiner means for combining the plurality of spread-spectrum channels as a code-division-multiplexed signal;
modulator means for transmitting the code-division-multiplexed signal having the plurality of spread-spectrum channels, over a communications channel;
demodulator means for translating the code-division-multiplexed signal to a processing frequency;
despreader means for despreading the code-division-multiplexed signal into a plurality of despread channels, respectively;
adder means, electronically controlled by an adder-control signal, for adding at least two despread channels to generate a multiplicity of added channels;
decoder means for generating a syndrome signal from an error rate of the multiplicity of added channels, and for FEC decoding and de-interleaving the multiplicity of added channels and a multiplicity of decoded channels;
command means, responsive the syndrome signal, for determining a desired-data rate, for generating a data-rate command signal having the desired data rate, for generating the adder-control signal for adding together a number of despread channels of the plurality of despread channels, and for generating a multiplexer signal having a number of decoded channels to multiplex together;
and
multiplexer means for multiplexing the multiplicity of decoded channels and an estimate of the input data.

9 more elements

A spread-spectrum method comprising the steps of:

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;
spread-spectrum processing the plurality of FEC encoded and interleaved channels as a plurality of spread-spectrum channels, employing a plurality of chip-sequence signals;
combining the plurality of spread-spectrum channels as a code-division-multiplexed signal;
transmitting the code-division-multiplexed signal having the plurality of spread-spectrum channels, over a communications channel;
translating the code-division-multiplexed signal to a processing frequency;
despreading the code-division-multiplexed signal into a plurality of despread channels, respectively;
adding at least two despread channels to generate a multiplicity of added channels;
generating a syndrome signal from an error rate of the multiplicity of added channels;
FEC decoding and de-interleaving the multiplicity of added channels, and a multiplicity of decoded channels;
determining, in response to the syndrome signal, a desired-data rate;
generating a data-rate command signal having the desired data rate;
generating, in response to the syndrome signal, the adder-control signal for adding together a number of despread channels of the plurality of despread channels;
generating, in response to the syndrome signal, a multiplexer signal having a number of decoded channels to multiplex together;
multiplexing the multiplicity of decoded channels and an estimate of the input data.

12 more elements

Dependencies are inferred from the claim text.