Robust THP Design with the Presence of Errors in CSIT Acquisition

作     者：Wang Xuzhen Niu Kai He Zhiqiang Yu Guangwei Li Hui 

作者机构：Inforrnation Theoryand Technology Education and Research Center Beijing University of Posts and Telecommunications Beijing 100876 China The Pilot College Beijing University of Technology Beijing 101101 China 

基　　金：supported by National Basic Research Program of China (973 Program) (Grant No. 2007CB310604, 2009CB320401) National Natural Science Foundation of China (Grant No. 60772108, 60702048) 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2010年第7卷第2期

页      码：78-86页

摘      要：In this paper, a robust THP is proposed for broadcast channel in multi-user multi-input multi-output (MU-MIMO) system, in which the channel uncertainty caused by feedback delay and mobile speed is taken into account. In order to acquire the imperfect channel state information at transmitter (CSIT), a dynamic CSIT model is introduced where the channel temporal and spatial correlations are considered. By utilizing the unchanged channel statistics and accurate outdated feedback channel information jointly, the imperfect CSIT is obtained as the channel estimate and error covariance. Based on the obtained imperfect CSIT, a Minimum Mean-Square Error (MMSE) Tomlinsion-Harashima precoding (THP) is designed and the closed-form solution is derived by the Lagrangian multiplier approach under total power constraint. Simulation results are provided to indicate the preferable performances of the robust THP. Performance analysis with respect to feedback delay and mobile speed is also given.

主 题 词：多通道用户 通信技术 信息发送器 信道 

学科分类：0810[工学-土木类] 080904[080904] 0808[工学-自动化类] 0809[工学-计算机类] 0839[0839] 08[工学] 080402[080402] 0804[工学-材料学] 081001[081001] 0812[工学-测绘类] 

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