Title :
Turbo decoding of a low-density generator matrix code for a high-density magnetic recording channel
Author :
Nishiya, Takushi ; Mita, Seiichi ; Nara, Takashi
Author_Institution :
Syst. Dev. Lab., Hitachi Ltd., Yokohama, Japan
Abstract :
In this paper, we propose a turbo decoding method for a low-density generator matrix code. It is based on the Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm and the belief propagation (BP) algorithm. Userbits with high error probability are selected for the BP algorithm by using the soft-output of the BCJR algorithm. Since the amount of calculation in the BP algorithm increases exponentially with the number of the userbits, the amount of calculation is reduced drastically by the selection of the userbits with higher error probability. We showed that the use of the proposed algorithm and 16/17 MTR code on an MEEPR4 channel results in a performance better than that obtained without turbo decoding
Keywords :
AWGN channels; belief networks; digital magnetic recording; error statistics; iterative decoding; partial response channels; turbo codes; 16/17 MTR code; BCJR algorithm; Bahl-Cocke-Jelinek-Raviv algorithm; MEEPR4 channel; belief propagation algorithm; error probability; high-density magnetic recording channel; low-density generator matrix code; partial response channel; turbo decoding; Belief propagation; Error probability; Intersymbol interference; Iterative algorithms; Iterative decoding; Magnetic recording; Maximum likelihood decoding; Maximum likelihood detection; Performance gain; Semiconductor device noise;
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-6451-1
DOI :
10.1109/GLOCOM.2000.891960
