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Joint Transmitter and Receiver Design Based on SPPLNR for Multi-user MIMO Channel with Channel Estimation Error  

Seo, Dong-Joon (LG Electronics)
Lee, Pan-Hyung (Seoul National University)
Lee, Jae-Hong (Seoul National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.2, 2009 , pp. 53-59 More about this Journal
Abstract
In multi-user MIMO systems, a base station transmits multiple data to multi-user simultaneously in order to improve performance and bandwidth efficiency. When the base station transmits multiple data to multi-user simultaneously, multi-user interference occurs severely. In this paper, we define a post-processing leakage as the total power leaked from desired user to all other users after combining at the output of each user. Using concept of the post-processing leakage, we also define a performance metric, the so called signal-to-post-processing-leakage-plus-noise ratio (SPPLNR). Assuming that the receiver is the minimum mean square error (MMSE) receiver, we propose an iterative SPPLNR-based beamforming that determines beamforming vectors and combining vectors by using an iterative method. The proposed scheme does not impose a condition on the relation between the number of transmit antennas for the base station and the number of receive antennas for users. Simulation results show that the proposed scheme outperforms a beamforming scheme perfectly eliminating the multi-user interference when channel estimation error exists.
Keywords
multi-user beamforming; multi-user preceding; multi-user MIMO system;
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Times Cited By KSCI : 2  (Citation Analysis)
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