Variable throughput reduction communications system and method

• US 7,613,247 B2
• Filed: 04/25/2005
• Issued: 11/03/2009
• Est. Priority Date: 06/14/2000
• Status: Expired

• Current Assignee: Stormborn Technologies LLC (IP Edge LLC)
• Original Assignee: Linex Technologies, Inc.
• Inventors: Garodnick, Joseph
• Primary Examiner(s): VO, DON NGUYEN
• Application Number:
  US11/113,956
• Publication Number:
  US 20050278607A1
• Time in Patent Office: 1,653 Days
• Field of Search: 375/140, 375141-144, 375/148, 375150-153, 375/267, 370/320, 370/335, 370/342, 370/441, 714/785, 714/793
• US Class Current: 375/267
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/02 by diversity reception
• CPC Class Codes: H04L 2001/0096 Channel splitting in point-to-point links
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

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

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.

2. 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.

3. 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.

4. 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.

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.

6. 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.

7. 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.

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.

9. 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.

10. 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.