Robust Precoding Schemes for Multi-User MISO-OFDM Downlink with Limited Time-Domain Feedback  

作　　者：苏泳涛 张贤达 

机构地区：[1]Department of Automation,Tsinghua University

出　　处：《Tsinghua Science and Technology》2009年第6期725-731,共7页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.60675002)

摘　　要：In multi-user multiple-input single-output orthogonal frequency-division multiplexing （MISO-OFDM） downlinks with limited feedback, both linear precoders （LP） and Tomlinson-Harashima precoders （THP） experience performance degradation due to inaccurate channel state information at the transmitter （CSIT）. This analysis treats the downlink channels as random quantities and exploits their second order statistics in robust precoding schemes to correct the errors introduced in the feedback procedure. The time-domain channel vectors are found to reduce the feedback overhead more than the frequency-domain vectors. A compression and restoration method and a codebook design are also given to obtain compact feedback quantities. Simulations show that the robust LP and THP are superior to the previous methods with tradeoffs possible between performance and feedback overhead.In multi-user multiple-input single-output orthogonal frequency-division multiplexing （MISO-OFDM） downlinks with limited feedback, both linear precoders （LP） and Tomlinson-Harashima precoders （THP） experience performance degradation due to inaccurate channel state information at the transmitter （CSIT）. This analysis treats the downlink channels as random quantities and exploits their second order statistics in robust precoding schemes to correct the errors introduced in the feedback procedure. The time-domain channel vectors are found to reduce the feedback overhead more than the frequency-domain vectors. A compression and restoration method and a codebook design are also given to obtain compact feedback quantities. Simulations show that the robust LP and THP are superior to the previous methods with tradeoffs possible between performance and feedback overhead.

关 键 词：linear precoding Tomlinson-Harashima precoding （THP） multiple-input single-output （MISO） orthogonal frequency-division multiplexing （OFDM） 

分 类 号：TN919.3[电子电信—通信与信息系统]