文献类型：期刊文献

英文题名：A Low Complexity Sequential Message Passing Detection Algorithm for RCP-OTFS Systems

作者：Xu, Renhe[1];Liang, Yuanyi[1];Huai, Qiwei[1];Yuan, Weina[1]

机构：[1]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：14

期号：4

起止页码：964

外文期刊名：IEEE WIRELESS COMMUNICATIONS LETTERS

收录：;EI(收录号：20250517788765);WOS:【SCI-EXPANDED(收录号:WOS:001464889800001)】；

语种：英文

外文关键词：Vectors; Message passing; Delays; Interference; Bit error rate; Approximation algorithms; Time-frequency analysis; Signal detection; Receivers; Matrix converters; OTFS; message passing; signal detection; fractional doppler; sequential update

摘要：Orthogonal Time Frequency Space (OTFS) modulation exhibits excellent bit error rate (BER) performance in high-speed mobile scenarios. However, the two-dimensional modulation of OTFS causes inter-Doppler interference (IDI) in fractional Doppler channel, which reduces channel sparsity and brings higher complexity to signal detection. In this letter, we derive the delay-Doppler (DD) domain input-output relationship in block vector form based on the Reduce Cyclic Prefix-OTFS (RCP-OTFS) systems, and prove that the block channel matrix has column orthogonality under rectangular waveform. Based on this property, a low complexity sequential message passing (SMP) algorithm is proposed to achieve signal detection. The proposed algorithm weights and combines the block received signal and uses the new observation nodes for message transmission. Furthermore, the sequential updates is introduced to sequentially update the information passed from variable nodes to observation nodes. Our simulation results show that the proposed algorithm has lower computational complexity and faster convergence speed compared to the baseline algorithms, and has similar BER performance to the message passing (MP) algorithm.