DocumentCode :
1321460
Title :
Performance of Low-Density Parity Check Codes With Parity Encoded by (1, 7) Run-Length Limited Code for Perpendicular Magnetic Recording
Author :
Kim, Jinyoung ; Lee, Jaejin ; Lee, Joohyun
Author_Institution :
Soongsil Univ., Seoul, South Korea
Volume :
48
Issue :
11
fYear :
2012
Firstpage :
4610
Lastpage :
4613
Abstract :
Maximum transition run (MTR) codes have recently been applied for perpendicular magnetic recording because of their high code rate. At the same time, the (1, 7) run-length limited (RLL) code, which increases the minimum distance of data transition, has not been applied due to a code rate that is lower than MTR codes. Therefore, in order to receive the advantages of both codes when low-density parity check (LDPC) codes are applied, this paper proposes an LDPC coding scheme with parity encoded by (1, 7) RLL code. This will increase the performance of LDPC codes and minimize the loss of code rate with MTR-coded user data in the perpendicular magnetic recording channel. The Viterbi trellis is easily modified by different constraints of MTR and (1, 7) RLL codes. Simulation results show that MTR-coded user data with (1, 7) RLL-coded LDPC parity performs approximately 0.3 dB better than MTR-coded user data with parity. It also performs better regardless of various user bit densities.
Keywords :
Viterbi decoding; parity check codes; perpendicular magnetic recording; runlength codes; trellis codes; LDPC codes; MTR codes; RLL code; Viterbi trellis; low-density parity check codes; maximum transition run code; perpendicular magnetic recording; run-length limited code; Bit error rate; Decoding; Modulation; Parity check codes; Perpendicular magnetic recording; Viterbi algorithm; Low-density parity check (LDPC) codes; maximum transition run (MTR) codes; perpendicular magnetic channel; run-length limited (RLL) codes;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2012.2197736
Filename :
6332803
Link To Document :
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