Robust Precoding Designs for Multiuser MIMO Systems With Limited Feedback

被引：2

作者：

Zhou, Wentao ^{[1
]}

Zhang, Di ^{[2
]}

Debbah, Merouane ^{[3
]}

Lee, Inkyu ^{[1
]}

机构：

[1] Korea Univ, Sch Elect Engn, Seoul 02841, South Korea

[2] Zhengzhou Univ, Sch Elect & Informat Engn, Zhengzhou 450001, Peoples R China

[3] Khalifa Univ Sci & Technol, Dept Elect Engn & Comp Sci, Abu Dhabi, U Arab Emirates

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2024年 / 23卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

Precoding; Quantization (signal); Signal to noise ratio; Iterative methods; Degradation; Wireless communication; Mean square error methods; Limited feedback; multiuser-MIMO; robust precoding design; SUM-RATE MAXIMIZATION; BLOCK DIAGONALIZATION; CHANNEL INVERSION; MULTIPLE-ACCESS; MISO SYSTEMS; MMSE; COMMUNICATION; QUANTIZATION; CSIT;

D O I：

10.1109/TWC.2024.3363766

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

It has been well known that the achievable rate of multiuser multiple-input multiple-output systems with limited feedback is severely degraded by quantization errors when the number of feedback bits is not sufficient. To overcome such a rate degradation, we propose new robust precoding designs which can compensate for the quantization errors. In this paper, we first analyze the achievable rate of traditional precoding designs for limited feedback systems. Then, we obtain an approximation of the second-order statistics of quantized channel state information. With the aid of the derived approximation, we propose robust precoding designs in terms of the mean square error (MSE) with conditional expectation in non-iterative and iterative fashions. For the non-iterative precoding design, we study a robust minimum MSE (MMSE) precoding algorithm by extending a new channel decomposition. Also, in the case of iterative precoding, we investigate a robust weighted MMSE (WMMSE) precoding to further improve the achievable rate. Simulation results show that the proposed precoding schemes yield significant improvements over traditional precoding designs.

引用

页码：9583 / 9595

页数：13