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Graph-Based Detection and LDPC Decoding over 2D Intersymbol Interference Channels

Yingying Li, Zhiliang Qin, Lianghui Zou, Yu Qin, and Qidong Lu
Weihai Beiyang Electric Group Co. Ltd., Weihai, Shandong, China

Abstract—In this paper, we propose a fully graph-based iterative detection and decoding scheme for Low-Density Parity-Check (LDPC) coded generalized two-dimensional (2D) intersymbol interference (ISI) channels. The 2D detector consists of a downtrack detector based on the symbol-level sum-product algorithm (SPA) and a bit-level SPA-based crosstrack detector. A LDPC decoder based on simplified check node operations is also proposed to provide soft information for the 2D channel detector. Numerical results show that the proposed receiver achieves better performance as compared with the trellis-based BCJR detector over 2×2 2D channels while at a significantly lower computational complexity.
 
Index Terms—LDPC decoding, symbol-level, sum-product algorithm, two-dimensional partial-response channels

Cite: Yingying Li, Zhiliang Qin, Lianghui Zou, Yu Qin, and Qidong Lu, "Graph-Based Detection and LDPC Decoding over 2D Intersymbol Interference Channels," Journal of Communications vol. 16, no. 3, pp. 91-98, March 2021. Doi: 10.12720/jcm.16.3.91-98

Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.