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General Information
Editor-in-chief

Prof. Pascal Lorenz
University of Haute Alsace, France
 
It is my honor to be the editor-in-chief of IJFCC. The journal publishes good papers in the field of future computer and communication. Hopefully, IJFCC will become a recognized journal among the readers in the filed of future computer and communication.

IJFCC 2020 Vol.9(4): 74-78 ISSN: 2010-3751
DOI: 10.18178/ijfcc.2020.9.4.569

Quantized Turbo Equalization for Non-binary LDPC Coded Partial-Response Channels

Nina Zhang, Zhiliang Qin, Yingying Li, Luyan Xing, Qidong Lu, Xiaowei Liu
Abstract—In this paper, we consider iterative detection and decoding (i.e., turbo equalization) for nonbinary low-density parity-check (LDPC) coded partial-response channels, where a quantizer is present to discretize the continuous received signal. We propose a turbo equalizer that uses the pre-computed quantized channel transition probabilities in the symbol-level BCJR channel detection algorithm, which significantly reduces the computational complexity by avoiding real-time floating-point multiplications. The proposed approach is further extended to nonbinary LDPC coded bit-patterned media recording (BPMR) channels. Simulation results show that with a small number of quantization bits, the proposed receiver approaches closely the performance of the conventional turbo equalizer operating on unquantized signals.

Index Terms—BCJR algorithm, nonbinary LDPC codes, quantization, turbo equalization

Nina Zhang and Luyan Xing are with Weihai Beiyang Optic-Electronic Info-Tech Co. Ltd., China (e-mail: zhangnina; xingluyan}@beiyang.com).
Zhiliang Qin, Yingying Li, Qidong Lu, and Xiaowei Liu are with Weihai Beiyang Electrical Group Co., Ltd, Weihai, Shandong, China (e-mail: qinzhiliang, liyingying, luqidong, liuxiaowei}@beiyang.com).

[PDF]

Cite: Nina Zhang, Zhiliang Qin, Yingying Li, Luyan Xing, Qidong Lu, Xiaowei Liu, "Quantized Turbo Equalization for Non-binary LDPC Coded Partial-Response Channels," International Journal of Future Computer and Communication vol. 9, no. 4, pp. 74-78, 2020.

Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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