A Transmit Preprocessing Technique for Downlink
SDMA in Multi-user MIMO Channels
Wang Ya-feng①; Zhang Jun-feng②; Zhang Jian①; Yang Da-cheng①
①College of Telecommunications, Beijing University of Posts & Telecommunications, Beijing 100876, China; ②Mobile Division, ZTE Corporation, Shenzhen 518057, China
Abstract：A transmit preprocessing technique for downlink spatial multiplexing in multi-user MIMO channels is proposed in this paper. Through adding additional constraint to the joint TX-RX MMSE optimization scheme the equivalent channel can be changed from block-diagonalization to complete diagonalization. Thus both MUI (Multi-User Interference) and per-user multi-stream interference can be canceled simultaneously. Besides the general advantage of the algorithms based on block-diagonalization, the modified algorithm is much more feasible and has the advantage of simplifying the receivers.
2006, Vol. 28 
