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Investigating the Effect of Mutual Coupling on SVD Based Beam-forming over MIMO Channels

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Author(s): Feng Wang | Marek E. Bialkowski | Xia Liu

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 3;
Issue: 4;
Start page: 34;
Date: 2009;
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Keywords: MIMO'mutual coupling'SVD | Beam-forming'LMMSE

ABSTRACT
This paper investigates the effect of mutual coupling on the performance of SVD based beam-forming technique over a Rician MIMO channel. SVD based beam-forming technique were proposed as a baseband signal processing algorithm to combat NLOS issues. However, most of the researches done in regards to SVD based beam-forming technique are based on the assumption of “ideal array antennas” in which lots of practical issues including the transmitter and receiver array geometry, the number of antenna elements, the inter-element spacing and orientation are not considered. Particularly, the effect of mutual coupling due to finite element spacing is neglected. In real array antennas, Mutual Coupling (MC) is always present and its effects cannot be neglected, especially for tightly spaced arrays. Although the presence of mutual coupling leads to the “cross talk” problems for the SVD based beam-forming techniques. However, it does not adversely affect the system capacity. For some particular range of SNR, inter-element spacing, mutual coupling can in fact increase the capacity and in fact be beneficial in terms of decreasing SER
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