信道反馈延迟时上行多用户MIMO中继系统预编码

doi:10.3969/j.issn.0255-8297.2017.02.003

应用科学学报 ›› 2017, Vol. 35 ›› Issue (2): 160-170.doi: 10.3969/j.issn.0255-8297.2017.02.003

信道反馈延迟时上行多用户MIMO中继系统预编码

苏君煦¹, 陈小敏^1,2, 胡续俊¹, 朱秋明^1,2,3

1. 南京航空航天大学电子信息工程学院, 南京 211106;
2. 南京航空航天大学江苏省物联网与控制技术重点实验室, 南京 211106;
3. 中国空空导弹研究院, 河南洛阳 471009

收稿日期:2016-07-08 修回日期:2016-09-23 出版日期:2017-03-30 发布日期:2017-03-30
通信作者: 陈小敏,副教授,研究方向:无线通信、空时编码的信号检测和链路自适应技术,E-mail:chenxm402@nuaa.edu.cn E-mail:chenxm402@nuaa.edu.cn
基金资助:
中国博士后科学基金（No.2013M541661）；中央高校基本科研业务费专项资金（No.NS2016044，No.NS2015046）；江苏省博士后基金（No.1601017C）；南京航空航天大学研究生创新基地（实验室）开放基金（No.kfjj20160412）资助

Precoding for Up-link Multi-user MIMO Relay Systems with Feedback Delay

SU Jun-xu¹, CHEN Xiao-min^1,2, HU Xu-jun¹, ZHU Qiu-ming^1,2,3

1. College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
2. Jiangsu Key Laboratory of Internet of Things and Control Technologies, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
3. China Airborne Missile Academy, Luoyang 471009, Henan Province, China

Received:2016-07-08 Revised:2016-09-23 Online:2017-03-30 Published:2017-03-30

摘要/Abstract

摘要：

研究了信道存在反馈延迟和估计误差条件下，上行多用户多输入多输出中继系统的线性预编码算法.在中继发射功率受限条件下，考虑发送端-中继节点以及中继节点-目的端信道估计方法的局限性及反馈链路的时延性.根据最小均方误差准则设计以预编码矩阵为变量的优化问题，并采用联合迭代法求得中继端和接收端处理矩阵的闭式解.数值仿真结果表明，当存在信道反馈延迟和估计误差时，所提方案比现有算法更能有效降低系统误比特率.

关键词: 多用户, 反馈延迟, 多输入多输出中继, 预编码, 误比特率

Abstract:

This paper proposes an optimal linear precoding scheme for uplink multi-user multiple-input multiple-output (MIMO) relay systems applicable to a channel with feedback delay and channel estimation errors. Limitations of the channel estimation method and the time delay of feedback link are considered. Design of transceiver is simplified as an optimal problem with precoding matrix variables, derived with a maximum power constraint at the relay station based on the minimum mean-square error (MMSE) criterion. The relay precoding matrix and decoding matrix are obtained, and the equalizer optimized with a linear iterative searching algorithm. Numerical simulation shows that the proposed scheme can effectively reduce the bit error rate of the system when channel feedback delay and estimation error exist.

Key words: multiple-input multiple-output (MIMO) relay, feedback delay, precoding, multi-user, bit error rate (BER)

中图分类号:

TN98

苏君煦, 陈小敏, 胡续俊, 朱秋明. 信道反馈延迟时上行多用户MIMO中继系统预编码[J]. 应用科学学报, 2017, 35(2): 160-170.

SU Jun-xu, CHEN Xiao-min, HU Xu-jun, ZHU Qiu-ming. Precoding for Up-link Multi-user MIMO Relay Systems with Feedback Delay[J]. Journal of Applied Sciences, 2017, 35(2): 160-170.

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信道反馈延迟时上行多用户MIMO中继系统预编码

Precoding for Up-link Multi-user MIMO Relay Systems with Feedback Delay

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