Optimal precoding for orthogonalized spatial multiplexing in closed-loop MIMO systems

Young Tae Kim; Heunchul Lee; Seokhwan Park; Inkyu Lee

doi:10.1109/JSAC.2008.081021

Optimal precoding for orthogonalized spatial multiplexing in closed-loop MIMO systems

Young Tae Kim, Heunchul Lee, Seokhwan Park, Inkyu Lee

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

In this paper, we propose a new precoding algorithm for orthogonalized spatial multiplexing (OSM) systems over flatfading 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.

Original language	English
Article number	4641965
Pages (from-to)	1556-1566
Number of pages	11
Journal	IEEE Journal on Selected Areas in Communications
Volume	26
Issue number	8
DOIs	https://doi.org/10.1109/JSAC.2008.081021
Publication status	Published - 2008 Oct

Bibliographical note

Funding Information:
Manuscript received October 26 2007; revised April 17, 2008. This research was supported in part by the Ministry of Knowledge Economy, Korea, under the Information Technology Research Center support program supervised by the Institute for Information Technology Advancement (IITA-2008-C1090-0801-0013) and in part by grant No. R01-2006-000-11112-0 from the Basic Research Program of the Korea Science and Engineering Foundation. This paper was presented in part at IEEE International Conference on Communications, Beijing, China, May 2008.

Keywords

Closed-loop MIMO system
Limited feedback
ML receiver
Minimum Euclidean distance
Precoding design

ASJC Scopus subject areas

Computer Networks and Communications
Electrical and Electronic Engineering

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10.1109/JSAC.2008.081021

Cite this

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title = "Optimal precoding for orthogonalized spatial multiplexing in closed-loop MIMO systems",

abstract = "In this paper, we propose a new precoding algorithm for orthogonalized spatial multiplexing (OSM) systems over flatfading 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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author = "Kim, {Young Tae} and Heunchul Lee and Seokhwan Park and Inkyu Lee",

note = "Funding Information: Manuscript received October 26 2007; revised April 17, 2008. This research was supported in part by the Ministry of Knowledge Economy, Korea, under the Information Technology Research Center support program supervised by the Institute for Information Technology Advancement (IITA-2008-C1090-0801-0013) and in part by grant No. R01-2006-000-11112-0 from the Basic Research Program of the Korea Science and Engineering Foundation. This paper was presented in part at IEEE International Conference on Communications, Beijing, China, May 2008.",

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N2 - In this paper, we propose a new precoding algorithm for orthogonalized spatial multiplexing (OSM) systems over flatfading 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.

AB - In this paper, we propose a new precoding algorithm for orthogonalized spatial multiplexing (OSM) systems over flatfading 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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Optimal precoding for orthogonalized spatial multiplexing in closed-loop MIMO systems

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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