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Limited-Search Chase Decoding Algorithm for LDPC Coded Underwater Acoustic Multiuser Channels

Xingming Li 1, Zhiliang Qin 2, Yuanhao Sun 1, Qidong Lu 2, and Xiaowei Liu 2
1. Weihai Cloud Computing Center, China
2. Weihai Beiyang Electrical Group Co., Ltd, Weihai, Shandong, China

Abstract—In this paper, we propose a low-complexity soft-input/soft-output (SISO) Chase multiuser detector that has a polynomial computational complexity in terms of the number of the least reliable bit positions for low-density parity-check (LDPC) coded code-division multiple-access (CDMA) systems, which is a potentially competitive technology for underwater acoustic networks (UWAN). Simulation results over highly correlated channels show that the proposed detector can afford searching over a larger number of the least reliable bit positions and achieve better bit-error-rate (BER) performance as compared with the Chase-II detector at much lower complexity.
 
Index Terms—Chase decoding, coded CDMA, local neighborhood, multiuser detection, soft-input/soft-output

Cite: Xingming Li, Zhiliang Qin, Yu Qin, Yuanhao Sun, Qidong Lu, and Xiaowei Liu, "Limited-Search Chase Decoding Algorithm for LDPC Coded Underwater Acoustic Multiuser Channels," Journal of Communications vol. 16, no. 2, pp. 76-81, February 2021. Doi: 10.12720/jcm.16.2.76-81

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.

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