Patent ID: 6757122
Filing Date: 2004-06-29
Classification: H03M

Abstract:
A communication system for decoding data which is encoded with a linear low density parity check code having a parity check matrix H constructed from circulants, the communication system comprising:a channel detector which provides as an output log-likelihood ratios, each log-likelihood ratio being indicative of a probability that a transmitted bit u of a code word is equal to 1; a low density parity check code decoder coupled to the channel detector and receiving the log-likelihood ratios &lgr; as an input, the decoder configured to convert the log-likelihood ratios into real numbers &Lgr;, to generate corrections &mgr; to the log-likelihood ratios &lgr;, and to generate corrected log-likelihood ratios &lgr;â€² as a function of the log-likelihood ratios &lgr; and the corrections &mgr;, the decoder providing as an output a binary signal.