Method of identifying an improved configuration for a communication system using coding gain and an apparatus therefor

• US 6,625,777 B1
• Filed: 10/19/1999
• Issued: 09/23/2003
• Est. Priority Date: 10/19/1999
• Status: Expired due to Term

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Levin, Howard Earl, Kosmach, James J., Djordjevic, Jaksa
• Primary Examiner(s): Decady, Albert
• Assistant Examiner(s): Torres, Joseph D.
• Application Number:
  US09/420,471
• Time in Patent Office: 1,435 Days
• Field of Search: 714/774, 714/751
• US Class Current: 714/774
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• 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 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001

Abstract

Coding gain is used to configure a communication system using a programmable error correction scheme. A best available error correction configuration is selected from among several configurations to provide an optimal coding gain performance for a given line or set of line characteristics and a given communication system. Payload is calculated for each of several error correction configurations, and the configuration providing the highest payload for a target bit error rate is selected. Use of gross gain to configure the communication system further provides an optimal configuration.

Claims

1. A method of transmitting data, comprised of symbols that comprise a channel payload and error correction bits, at a bit error rate of better than or equal to a predetermined error rate via a communication channel, the method comprising:

determining a channel characteristic of the communication channel;

performing a calculation to determine a first type of error correction that satisfies said bit error rate and determines a first channel payload associated with the first type of error correction, wherein the calculation includes the characteristic of the communication channel and coding gain associated with the first type of error correction;

performing a calculation to determine a second type of error correction that satisfies said bit error rate and determines a second channel payload associated with the second type of error correction, wherein the calculation includes the characteristic of the communication channel and coding gain associated with the second type of error correction; and

selecting the first type of error correction if the first channel payload is greater than the second channel payload and the second type of error correction if the second channel payload is greater than the first channel payload.

2. The method of claim 1 wherein the first error correction configuration provides Trellis error correction for the communication channel.

3. The method of claim 2 wherein the second error correction configuration provides Reed-Solomon error correction for the communication channel.

4. The method of claim 1, further comprising:

performing a channel analysis on the communication channel to produce a signal to noise ratio of the communication channel; and

wherein;

the step of calculating the first channel payload further comprises using the signal to noise ratio; and

the step of calculating the second channel payload further comprises using the signal to noise ratio.

5. A method of configuring a communication system for communicating data over a communication channel, the method comprising:

measuring a signal to noise ratio of the communication channel;

making a calculation to determine an uncoded payload for a target bit error rate, wherein the calculation includes the signal to noise ratio;

making a calculation to determine a coded payload for the target bit error rate, wherein the calculation includes the signal to noise ratio and coding gain;

determining which of the uncoded payload and the coded payload is a greatest payload;

configuring the communication system to use a code corresponding to the greatest payload if the greatest payload is a coded payload; and

configuring the communication system to not use a code if the uncoded payload is the greatest payload.

6. A method of determining a payload based upon channel characteristics of a data communication channel, the method comprising:

measuring channel SNRs of the data communication channel;

selecting a target SNR reference table for a target bit error rate;

adjusting the target SNR reference table by applying at least one of a gross coding gain and a performance margin; and

determining a payload by calculating a channel capacity based on the measured channel SNRs and the target SNR reference table.

7. The method of claim 6 wherein the payload is an uncoded payload.

8. The method of claim 7 further comprising:

adjusting the channel capacity based on predetermined overhead.

9. The method of claim 6 wherein the payload is a coded payload.

10. The method of claim 9 wherein the determining the payload comprises:

calculating coding overhead;

adjusting the channel capacity based on predetermined overhead; and

adjusting the channel capacity based on the coding overhead.

11. The method of claim 10 wherein at least one of the predetermined overhead and the coded overhead is zero.

12. The method of claim 10 wherein

the coded payload is a Trellis coding payload;

and

the coding overhead is Trellis overhead.

13. The method of claim 10 wherein

the coded payload is a Reed-Solomon coding payload;

and

the coding overhead is Reed-Solomon overhead.

14. The method of claim 6 wherein the determining the payload comprises:

determining a first coded payload using a first code;

determining a second coded payload using a second code; and

determining a concatenated payload using the first and second codes.

15. A method of initializing a digital communication channel for transmitting at bit error rate not to exceed a predetermined bit error rate, the method comprising:

activating the channel;

performing a channel analysis on the communication channel to produce a signal to noise ratio of the communication channel;

performing calculations to determine a plurality of types of error correction that satisfy the predetermined bit error rate for the communication channel and to determine channel payloads associated with the plurality of types of error correction, wherein the calculation uses the signal to noise ratio and coding gains associated with the plurality of types of error correction; and

selecting the error correction from among the plurality of types of error correction that provides the greatest payload.

16. A method of determining a payload for a block coded error correction configuration, the method comprising:

performing one or more of the following operations;

calculating a capacity of a digital communication channel based upon reference signal-to-noise ratio values and based upon measured signal-to-noise ratio values;

calculating a difference between reference signal-to-noise ratio values and target reference signal-to-noise ratio values; and

determining a redundancy value that provides a coding gain that exceeds a difference between reference signal-to-noise ratio values and target reference signal-to-noise ratio values; and

determining the payload after performing the operation.

17. The method of claim 16 wherein the block coded error correction configuration is a Reed-Solomon error correction configuration.