Title :
Turbo decoding for high-rate concatenated parity-check codes on PRML channels
Author :
Sawaguchi, Hideki ; Wolf, Jack K.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Kokubunji, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
A simple turbo decoding scheme is proposed for partial-response (PR) channels by using high-rate parity-check codes as an outer error-correction code (ECC). The use of the simple parity codes enables a simplified and high-speed implementation of the a posterior probability (APP) decoder. Its key feature is an iterative decoding step for the parallel concatenation of two parity-check outer codes connected via an interleaver. The parity iterative decoding can provide the high-rate parity-check outer codes with superior correction capability for random error-events, so it can help to reduce the decoding latency. The combination of the serial turbo decoding for a modified E2PR (ME2PR) channel and the parity iterative decoding demonstrated a coding gain of 4-5 dB at a bit error rate of 1.0E-5 for a coding rate of 8/9
Keywords :
concatenated codes; digital magnetic recording; error correction codes; interleaved codes; iterative decoding; maximum likelihood decoding; partial response channels; turbo codes; 4 to 5 dB; PRML channels; a posterior probability decoder; bit error rate; coding gain; decoding latency; high-rate concatenated parity-check codes; interleaver; iterative decoding step; outer error-correction code; parallel concatenation; random error-events; serial turbo decoding; turbo decoding; AWGN; Bit error rate; Concatenated codes; Convolutional codes; Delay; Error correction codes; Iterative decoding; Lifting equipment; Magnetic recording; Parity check codes;
Journal_Title :
Magnetics, IEEE Transactions on
