An Efficient Multi-Mode Precoding for MIMO Systems with Full CSI

Myeongcheol SHIN  Sangheon KIM  Jiwon KANG  Chungyong LEE  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.10   pp.2973-2975
Publication Date: 2007/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.10.2973
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
closed loop MIMO,  full CSI,  adaptive bit loading,  mode table,  mode simplification,  

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For the closed loop multiple-input-multiple-output (MIMO) systems, Fisher's adaptive bit loading algorithm gives the best error performance by jointly optimizing the transmit powers, rates, and number of streams. However, its good performance comes at the cost of high and variable computational complexity for the joint optimization. In this letter, we propose an efficient multi-mode precoding algorithm using a simplified mode table. Numerical results show that the proposed algorithm provides almost the same performance as Fischer's with much less computational complexity.