Performance Analysis Based on Channel Matrix Eigenvalue for MIMO Systems in LOS Environments

Yutaka MURAKAMI, Kiyotaka KOBAYASHI, Masayuki ORIHASHI, Takashi MATSUOKA

Summary :

This paper makes an examination of BER (bit error rate) performance in 22 MIMO (Multi-Input Multi-Output) systems using spatial multiplexing in a LOS (line-of-sight) environment by analysis using the eigenvalue and eigenvector of the channel matrix and simulation. It is shown that BER performance in a LOS environment is dependent on the phase relation of direct paths and the minimum squared absolute value of the eigenvalue, which are determined by the propagated distance. A technique for improving BER performance in a LOS environment is then considered based on these findings. A receive antenna selection (RAS) technique is presented which uses the minimum squared absolute value of the channel matrix eigenvalue. Proof is then given that BER performance is improved using this RAS technique, thus making clear the validity of this approach for obtaining optimum BER performance in a LOS environment.

• Publication: IEICE TRANSACTIONS on Fundamentals Vol.E88-A No.10 pp.2926-2936
• Publication Date: 2005/10/01
• DOI: 10.1093/ietfec/e88-a.10.2926
• Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications)
• Category: MIMO System

Authors

Yutaka MURAKAMI
Kiyotaka KOBAYASHI
Masayuki ORIHASHI
Takashi MATSUOKA

Keyword

MIMO,  BER performance,  LOS,  phase relation of direct paths,  channel matrix eigenvalue