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PRML detection scheme with modified trellis for a MTR code  

Lee Joo hyun (동국대학교 전자공학과 통신 및 정보저장 연구실 전자공학과 통신 및 정보저장 연구실)
Lee Jea jin (동국대학교 전자공학과 통신 및 정보저장 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.12C, 2004 , pp. 1601-1605 More about this Journal
Abstract
When codeword sequence has two or less successive transitions, the performance of 4th-order partial response maximum-likelihood (PRML) detector can be improved. However, the code leads to an unacceptable loss of performance due to the low code rate. For a rate 718 code that MTR constraint (i) of each codeword is limited to 2, and j is allowed to be 3 when codewords are connected, we modified the trellis of PRML detector to combine j=2 with J=3. We confirmed that the rate 718 coded 4th-order PRML detection with combined trellis achieves the SNR gain more than 2dB compared to the rate 819 coded 4u_order PRML detection at 10-s BER in high-density longitudinal or perpendicular magnetic recording systems.
Keywords
PRML detection; MTR code; magnetic recording systems; Viterbi trellis;
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