Study of Low-Density Parity-Check Codes on Digital Storage Systems

• Main Authors: Po-Chuan Peng, 彭博詮
• Other Authors: Yin-Yi Lin
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/35640972036875171430

碩士 === 國立中央大學 === 通訊工程研究所 === 93 === The advanced signal processing technique referred to as the partial response and maximal likelihood (PRML) channel is usually employed in the digital recording systems to increase the recording density and/or data transmission rate. In addition, a turbo equalization scheme was investigated in which a turbo code consisted of two parallel systematic convolutional codes was employed as an outer code and the BCJR detection of the TMTR-coded partial response channel was employed as an inner code.But this kind of Turbo Equalizer is too slow. We proposed a new turbo equalization scheme the window-BCJR detection for the TMTR-coded partial response channel can be processed in a parallel way and the decoding delay could be ignored, the decoding of the outer code is the low-density parity-check (LDPC) codes. The recent research for the turbo decoding has been focused on the LDPC codes due to that a parallel processing architecture for decoding of the LDPC codes is possible, and this leads to a short decoding delay.We instead of using turbo codes the low density parity check (LDPC) codes are employed as the outer code in the turbo equalization scheme. The turbo decoding for the TMTR-coded partial response channel with the LDPC codes will be investigated.