多irs辅助MIMO系统中面向空间复用的信道重构

IF 7.1 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Vehicular Technology Pub Date : 2025-02-21 DOI:10.1109/TVT.2025.3540067

Yuxuan Chen;Qingqing Wu;Guangji Chen;Wen Chen

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引用次数: 0

摘要

空间复用在提高多输入多输出通信系统的容量方面起着重要的作用。为了提高点对点MIMO系统的频谱效率（SE），我们利用多个智能反射面（IRSs）提供的信道重构能力来增强空间复用。与大多数现有的工作不同，我们解决了irs放置和元素分配的问题。为此，我们首先引入正交放置策略来减轻信道相关性，从而实现无干扰的多流传输。随后，我们提出了一种基于连续凸近似（SCA）的方法来联合优化IRS元件和功率分配。理论分析表明，当IRS单元数和发射功率趋于无穷大时，等IRS单元/功率分配方案趋于渐近最优。数值结果表明，当IRS单元总数或功率超过一定阈值时，多IRS辅助系统的性能优于单个IRS配置。

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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Spatial Multiplexing Oriented Channel Reconfiguration in Multi-IRS Aided MIMO Systems

Spatial multiplexing plays a significant role in improving the capacity of multiple-input–multiple-output (MIMO) communication systems. To improve the spectral efficiency (SE) of a point-to-point MIMO system, we exploit the channel reconfiguration capabilities provided by multiple intelligent reflecting surfaces (IRSs) to enhance the spatial multiplexing. Unlike most existing works, we address both the issues of the IRSs placement and elements allocation. To this end, we first introduce an orthogonal placement strategy to mitigate channel correlation, thereby enabling interference-free multi-stream transmission. Subsequently, we propose a successive convex approximation (SCA)-based approach to jointly optimize the IRS elements and power allocation. Our theoretical analysis unveils that equal IRS elements/power allocation scheme becomes asymptotically optimal as the number of IRS elements and transmit power tend to be infinite. Numerical results demonstrate that when the total number of IRS elements or the power exceeds a certain threshold, a multi-IRS assisted system outperforms a single IRS configuration.

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来源期刊

IEEE Transactions on Vehicular Technology 工程技术-电信学

CiteScore

6.00

自引率

8.80%

发文量

1245

审稿时长

6.3 months

期刊介绍： The scope of the Transactions is threefold (which was approved by the IEEE Periodicals Committee in 1967) and is published on the journal website as follows: Communications: The use of mobile radio on land, sea, and air, including cellular radio, two-way radio, and one-way radio, with applications to dispatch and control vehicles, mobile radiotelephone, radio paging, and status monitoring and reporting. Related areas include spectrum usage, component radio equipment such as cavities and antennas, compute control for radio systems, digital modulation and transmission techniques, mobile radio circuit design, radio propagation for vehicular communications, effects of ignition noise and radio frequency interference, and consideration of the vehicle as part of the radio operating environment. Transportation Systems: The use of electronic technology for the control of ground transportation systems including, but not limited to, traffic aid systems; traffic control systems; automatic vehicle identification, location, and monitoring systems; automated transport systems, with single and multiple vehicle control; and moving walkways or people-movers. Vehicular Electronics: The use of electronic or electrical components and systems for control, propulsion, or auxiliary functions, including but not limited to, electronic controls for engineer, drive train, convenience, safety, and other vehicle systems; sensors, actuators, and microprocessors for onboard use; electronic fuel control systems; vehicle electrical components and systems collision avoidance systems; electromagnetic compatibility in the vehicle environment; and electric vehicles and controls.