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