Joint Design of Precoders and Decoders for Multi-User MIMO Downlink without Iteration

Lanqi NIU  Taiyi ZHANG  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.4   pp.1384-1387
Publication Date: 2009/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.1384
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
multiuser MIMO,  downlink,  zero-force (ZF),  minimum mean square error (MMSE),  precoding,  

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In this letter, a new joint precoding and decoding design scheme for multiuser MIMO downlink is proposed which dispenses with iterative operations and can achieve better performance. This scheme introduces zero-force processing into minimum mean square error (MMSE) design scheme to avoid iterative operations. We derived closed-form precoders and decoders and transmit power allocation strategy of proposed design scheme, validated performance of proposed design scheme by computer simulation. The simulation results show that the proposed design scheme can achieve better bit error rate (BER) and sum capacity performance compared to an existing non-iterative design scheme.