US 8,149,959 B1 · Enhancements of soft decoders and detectors on asymmetric channels

Abstract

Systems and methods for enhancing soft decoders and detectors on asymmetric channels are provided. The methods include acquiring log-likelihood ratios (LLRS) for error-correction code (ECC) encoded data symbols, selecting a quality measure function and a quality threshold based on the LLRs, applying the selected quality measure function to the LLRs to obtain quality measures, comparing the quality measures to the selected quality threshold, and updating the LLRs for selected ECC encoded data symbols based on the comparisons. The updating may occur by multiplying the LLRs for the selected ECC encoded data symbols by a selected scaling factor.

Claims20

Dependent claims

A method for soft decoding data, the method comprising:

acquiring from a channel by a demodulator soft information for a plurality of error-correction code (ECC) encoded data symbols;
selecting by a channel detector/decoder pair a quality measure function and a quality threshold based, at least in part, on the soft information;
applying the selected quality measure function to the soft information to obtain quality measures;
comparing the quality measures to the selected quality threshold;
and
updating the soft information for selected ECC encoded data symbols based on the comparisons.

3 more elements

A system for soft decoding data, the system comprising:

an encoder to encode a plurality of error-correction code (ECC) encoded data symbols;
a digital modulator to transmit the ECC encoded data symbols over a channel;
a demodulator to receive the plurality of ECC encoded data symbols and acquiring soft information for the plurality of ECC encoded data symbols;
and
a channel detector/decoder pair configured to:
select a quality measure function and a quality threshold based, at least in part, on the soft information;
apply the selected quality measure function to the soft information to obtain quality measures;
compare the quality measures to the selected quality threshold;
and
update the soft information for selected ECC encoded data symbols based on the comparisons.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/012,407Filed 24 Jan 2011 · continuation

Priority

24 Aug 2006

Granted

3 Apr 2012

Term ends

Not estimatedThe source records don’t support an estimate.

Classification2 codes

H04L 1/0054
Arrangements at the receiver end: maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
H04L
Digital communication

Enhancements of soft decoders and detectors on asymmetric channels

Life of this patent

Enhancements of soft decoders and detectors on asymmetric channels

Life of this patent

Abstract

Claims20