A Low Complexity Sequential Message Passing Detection Algorithm for RCP-OTFS Systems

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Wireless Communications Letters Pub Date : 2025-01-23 DOI:10.1109/LWC.2025.3528448

Renhe Xu;Yuanyi Liang;Qiwei Huai;Weina Yuan

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Abstract

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.

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RCP-OTFS系统中一种低复杂度的顺序消息传递检测算法

正交时频空间（OTFS）调制在高速移动场景下具有优异的误码率（BER）性能。然而，OTFS的二维调制在分数多普勒信道中会产生多普勒间干扰（IDI），降低了信道的稀疏性，给信号检测带来了更高的复杂性。本文基于减少循环前缀otfs （RCP-OTFS）系统，导出了块矢量形式的延迟-多普勒域输入输出关系，并证明了块信道矩阵在矩形波形下具有列正交性。基于这一特性，提出了一种低复杂度的顺序消息传递（SMP）算法来实现信号检测。该算法对接收到的块信号进行加权合并，利用新的观测节点进行消息传输。此外，还引入了顺序更新，对从变量节点传递到观测节点的信息进行顺序更新。仿真结果表明，与基准算法相比，该算法具有更低的计算复杂度和更快的收敛速度，并且具有与消息传递（MP）算法相似的误码率性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.