Optimal Precoding for Orthogonalized Spatial Multiplexing in Closed-Loop MIMO Systems
- Authors
- Kim, Young-Tae; Lee, Heunchul; Park, Seokhwan; Lee, Inkyu
- Issue Date
- 10월-2008
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Closed-loop MIMO system; precoding design; ML receiver; limited feedback; minimum Euclidean distance
- Citation
- IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, v.26, no.8, pp.1556 - 1566
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
- Volume
- 26
- Number
- 8
- Start Page
- 1556
- End Page
- 1566
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122609
- DOI
- 10.1109/JSAC.2008.081021
- ISSN
- 0733-8716
- Abstract
- In this paper, we propose a new precoding algorithm for orthogonalized spatial multiplexing (OSM) systems over flat-fading multiple-input multiple-output (MIMO) channels. The OSM scheme was recently introduced for closed-loop MIMO systems which allows single symbol decodable maximum likelihood detection. To further improve the performance of the OSM system, we propose a new precoding method by maximizing the minimum Euclidean distance between constellation points in the effective channel. In order to efficiently identify the parameters of a precoder which maximizes the minimum distance, we introduce a partitioning approach. Through analysis, it is shown that one real value parameter and two bits are required for feedback information for precoding in 16-QAM systems. Simulation results demonstrate that our algorithm provides 9dB and 7.5dB gains at a bit error rate (BER) of 10(-4) over the conventional OSM systems for 4-QAM and 16-QAM, respectively. We also confirm that the performance of the proposed scheme is the same as that of the optimum closed-loop MIMO systems in terms of the minimum distance. Consequently, our precoding algorithm significantly improves the system performance with a small increase of feedback amount.
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