CSI Robust Joint User Selection and Precoder Design in MIMO Downlink Systems

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-04-02 DOI:10.1109/LWC.2025.3557052

Hossein Vaezy;Steven D. Blostein

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引用次数: 0

Abstract

In multiuser multiple-input multiple-output (MU-MIMO) systems, the selection of a subset of users to achieve the maximum sum rate is critical when resources are limited. In addition, designing suitable precoder and decoder matrices at the base station (BS) and at the user side requires unattainable perfect channel state information. In this letter, the downlink of a cellular system with multiple antennas at user equipments (UEs) is considered. A framework is derived for joint user selection and precoder/decoder design in the presence of imperfect channel estimation with neither instantaneous nor statistical error matrices. A robust method is proposed that incorporates a bounded worst-case channel in the design of precoders, decoders, and user selection. The optimization problem is solved iteratively by decomposition into multiple convex sub-problems which are solved successively. Finally, it is illustrated that for the case of a set of predesigned precoders, the interference pattern remains fixed for each user, implying that the problem of user selection could be transformed to that of beam selection.

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多输入多输出下行链路系统中的 CSI 鲁棒联合用户选择和前置编码器设计

在多用户多输入多输出（MU-MIMO）系统中，当资源有限时，选择用户子集以实现最大和速率是至关重要的。此外，在基站和用户端设计合适的预编解码器矩阵需要无法达到的完美信道状态信息。在这封信中，考虑了在用户设备（ue）上具有多天线的蜂窝系统的下行链路。在不完全信道估计中，既没有瞬时误差矩阵，也没有统计误差矩阵，导出了一个用于联合用户选择和预编码器/解码器设计的框架。提出了一种鲁棒的方法，在预编码器、解码器和用户选择的设计中结合有界最坏情况信道。将优化问题分解为多个凸子问题，依次求解，迭代求解。最后，说明了在一组预先设计的预编码器的情况下，每个用户的干扰方向图保持固定，这意味着可以将用户选择问题转化为波束选择问题。

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.