DocumentCode :
1270894
Title :
MMSE-Based MIMO Cooperative Relaying Systems: Closed-Form Designs and Outage Behavior
Author :
Song, Changick ; Lee, Kyoung-Jae ; Lee, Inkyu
Author_Institution :
Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
Volume :
30
Issue :
8
fYear :
2012
fDate :
9/1/2012 12:00:00 AM
Firstpage :
1390
Lastpage :
1401
Abstract :
In this paper, we investigate minimum mean squared error (MMSE) based amplify-and-forward cooperative multiple antenna relaying systems where a non-negligible direct link exists between the source and the destination. First, we provide a new design strategy for optimizing the relay amplifying matrix. Instead of conventional optimal design approaches resorting to an iterative gradient method, we propose a near optimal closed-form solution which provides an insight. As relay systems with a direct link incur a non-convex problem in general, we exploit the decomposable property of the error covariance matrix and a relaxation technique imposing a structural constraint on the problem. Next, we study the error performance limit of the proposed scheme using diversity-multiplexing tradeoff analysis, which leads to several interesting observations on MMSE-based cooperative relaying systems. Finally, through numerical simulations, we confirm that the proposed solution shows the performance very close to the optimum with much reduced complexity and the analysis closely matches with simulation results.
Keywords :
MIMO communication; amplify and forward communication; antenna arrays; concave programming; cooperative communication; covariance matrices; diversity reception; gradient methods; iterative methods; least mean squares methods; relays; MMSE-based MIMO cooperative relaying systems; amplify-and-forward cooperative multiple antenna relaying systems; closed-form designs; diversity-multiplexing tradeoff analysis; error covariance matrix; iterative gradient method; minimum mean squared error; nonconvex problem; nonnegligible direct link; optimal closed-form solution; outage behavior; relaxation technique; relay amplifying matrix; Antennas; Covariance matrix; Eigenvalues and eigenfunctions; MIMO; Matrix decomposition; Multiplexing; Relays; Closed-form design; DMT analysis; Direct link; MIMO; MMSE; Relay;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.2012.120909
Filename :
6280246
Link To Document :
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