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