# US 7,613,247 B2 · Variable throughput reduction communications system and method

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- Number: US 7,613,247 B2
- Document ID: US7613247B2
- Status: Granted
- Kind: B2
- Application number: 11/113,956
- Filed: 2005-04-25
- Published: 2005-12-15
- Granted: 2009-11-03
- Earliest claimed: 2000-06-14
- Assignees: Linex Technologies, Inc.
- Inventors: Joseph Garodnick
- Web page: https://patentgrep.com/patent/US7613247B2

## CPC

- H04L 1/02: by diversity reception
- H04B 1/707: using direct sequence modulation
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04J 13/004: {Orthogonal}
- H04L 1/0002: {by adapting the transmission rate}
- H04L 1/0041: {Arrangements at the transmitter end}
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04B 2201/70703: using multiple or variable rates
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 1/004: {by using forward error control (H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00)}
- H04L 2001/0096: {Channel splitting in point-to-point links}
- Y02D 30/50: in wire-line communication networks, e.g. low power modes or reduced link rate
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A communications system and method having a transmitted data rate determined by an error rate syndrome at a receiver. Data are demultiplexed into a plurality of data channels, and processed as a plurality of channels. A combiner combines the plurality of channels as a multiplexed signal. At a receiver, the multiplexed signal is despread into a plurality of despread channels. A syndrome signal is generated from an error rate of the channels. From the syndrome signal, a desired-data rate is determined for the transmitter.

## Claims

### 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 having an error rate;
a command processor responsive to the error rate for determining a desired data rate and generating a control signal to be transmitted to the transmitter; and
a multiplexer, coupled to said plurality of FEC decoders and de-interleavers, for multiplexing the multiplicity of decoded channels.

### Claim 2 (depends on 1)

The communications system as set forth in claim 1, wherein
said multiplicity of FEC decoders generates a plurality of syndrome signals; and
said command processor is responsive to the plurality of syndrome signals, for determining which channels in the plurality of modulated channels to delete from transmission over the communications channel.

### Claim 3 (depends on 1)

The communications system as set forth in claim 1, wherein
said multiplicity of FEC decoders generates a plurality of syndrome signals; and
a said command processor is responsive to the plurality of syndrome signals, for employing erasure decoding for correcting errors.

### Claim 4 (depends on 1)

The communications system as set forth in claims 1 wherein said command processor is responsive to the a plurality of syndrome signals for sending a data-rate command signal to the transmitter.

### Claim 5

A communications system comprising:
a transmitter, including,
demultiplexer means for demultiplexing input data into a plurality of data channels;
encoder means far 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 having an error rate;
command processor means responsive to the error rate for generating a signal indicating a desired data rate to be sent to said transmitter; and
multiplexer means for multiplexing the multiplicity of decoded channels.

### Claim 6 (depends on 5)

The communications system as set forth in claim 5, wherein
said decoder means generates a plurality of syndrome signals; and
said command processor is responsive to the plurality of syndrome signals for determining which channels in the plurality of modulated channels to delete from transmission over the communications channel.

### Claim 7 (depends on 5)

The communications system as set forth in claim 5, wherein
said decoder means generates a plurality of syndrome signals; and
said command processor means is responsive to the plurality of syndrome signals, for employing erasure decoding for correcting errors.

### Claim 8

A communications 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;
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;
generating, in response to the syndrome signal, a channel quality indication signal indicating a desired data rate;
transmitting the quality indication signal to the transmitter; and
multiplexing the multiplicity of decoded channels.

### Claim 9 (depends on 8)

The communications method as set forth in claim 8, further including the steps of:
generating a plurality of syndrome signals; and
determining, responsive to the plurality of syndrome signals, which channels in the plurality of modulated channels to delete from transmission over the communications channel.

### Claim 10 (depends on 8)

The communications method as set forth in claim 8, further including the steps of:
generating a plurality of syndrome signals; and
employing, responsive to the plurality of syndrome signals, erasure decoding for correcting errors.