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Joint Transmitter-Receiver Design for the Downlink Multiuser Spatial Multiplexing MIMO System

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4 Author(s)
P. Ma ; Wireless Signal Process. & Network Lab. Key Lab. of Universal Wireless Commun. Minist. of Educ., Beijing Univ. of Posts & Telecommun., Beijing ; W. Wang ; X. Zhao ; K. Zheng

In the multiuser spatial multiplexing multiple-input multiple-output (MIMO) system, the joint transmitter-receiver (Tx-Rx) design is investigated to minimize the weighted sum power under the post-processing signal-to-interference-and-noise rate (post-SINR) constraints for all subchannels. Firstly, we show that the uplink-downlink duality is equivalent to the Lagrangian duality in the optimization problems. Then, an iterative algorithm for the joint Tx-Rx design is proposed according to the above result. Simulation results show that the algorithm can not only satisfy the post-SINR constraints, but also easily adjust the power distribution among the users by changing the weights accordingly. So that the transmitting power to the edge users in a cell can be decreased effectively to alleviate the adjacent cell interference without performance penalty.

Published in:

2008 IEEE International Conference on Communications

Date of Conference:

19-23 May 2008