Beamforming Optimization and ADMM-Based Detection in IRS-Aided OTFS Systems

IF 6.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Open Journal of the Communications Society Pub Date : 2025-03-05 DOI:10.1109/OJCOMS.2025.3548271

Sushmita Singh;Kuntal Deka;Sanjeev Sharma;Yuan-Pei Lin;Neelakandan Rajamohan

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引用次数: 0

Abstract

Intelligent reflecting surface (IRS) technology has become a crucial enabler for creating cost-effective, innovative, and adaptable wireless communication environments. This study investigates an IRS-assisted orthogonal time frequency space (OTFS) modulation that facilitates communication between users and the base station (BS). The user’s attainable downlink rate can be boosted by collaboratively improving the reflection coefficient (RC) matrix at the IRS and beamforming matrix at the BS. Then, in the IRS-aided OTFS network, the problem of cooperative precoding at BS and IRS to improve the network throughput is framed. The precoding design problem is non-convex and highly complicated; an alternate optimization (AO) approach is proposed to solve this. Specifically, an approach based on strongest tap maximization (STM) and fractional programming is proposed. It solves RC matrix (at IRS) and beamforming matrix (at BS) alternatively. Moreover, an efficient signal detector for IRS-aided OTFS communication systems using the alternating direction method of multipliers (ADMM) is proposed. Finally, to estimate the cascaded MIMO channel, using a parallel factor tensor model that separates the IRS-User and BS-IRS MIMO channels, respectively is suggested. Simulation results show that the proposed method significantly enhances the system capacity and bit error rate (BER) performance compared to conventional OTFS.

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红外辅助OTFS系统的波束形成优化和基于admm的检测

智能反射面（IRS）技术已经成为创造具有成本效益、创新性和适应性强的无线通信环境的关键推动者。本研究探讨了一种irs辅助正交时频空间（OTFS）调制，以促进用户与基站（BS）之间的通信。用户可达到的下行速率可以通过协同改进IRS的反射系数（RC）矩阵和BS的波束形成矩阵来提高。然后，在IRS辅助的OTFS网络中，提出了在BS和IRS进行协同预编码以提高网络吞吐量的问题。预编码设计问题具有非凸性和高度复杂性；提出了一种替代优化（AO）方法来解决这个问题。具体地说，提出了一种基于最强抽头最大化（STM）和分式规划的方法。它交替求解RC矩阵（在IRS处）和波束形成矩阵（在BS处）。在此基础上，提出了一种适用于红外辅助OTFS通信系统的信号检测方法——乘法器交替方向法（ADMM）。最后，对级联MIMO信道进行估计，提出了一种分离IRS-User和BS-IRS MIMO信道的并行因子张量模型。仿真结果表明，与传统的OTFS相比，该方法显著提高了系统容量和误码率性能。

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 Open Journal of the Communications Society Multiple-

CiteScore

13.70

自引率

3.80%

发文量

审稿时长

10 weeks

期刊介绍： The IEEE Open Journal of the Communications Society (OJ-COMS) is an open access, all-electronic journal that publishes original high-quality manuscripts on advances in the state of the art of telecommunications systems and networks. The papers in IEEE OJ-COMS are included in Scopus. Submissions reporting new theoretical findings (including novel methods, concepts, and studies) and practical contributions (including experiments and development of prototypes) are welcome. Additionally, survey and tutorial articles are considered. The IEEE OJCOMS received its debut impact factor of 7.9 according to the Journal Citation Reports (JCR) 2023. The IEEE Open Journal of the Communications Society covers science, technology, applications and standards for information organization, collection and transfer using electronic, optical and wireless channels and networks. Some specific areas covered include: Systems and network architecture, control and management Protocols, software, and middleware Quality of service, reliability, and security Modulation, detection, coding, and signaling Switching and routing Mobile and portable communications Terminals and other end-user devices Networks for content distribution and distributed computing Communications-based distributed resources control.