A Remark on Spatial Correlation Coefficient Focusing on Propagation Channels for Evaluating Multi-Antenna Systems

Daisuke UCHIDA  Takero ASAI  Hiroyuki ARAI  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.10   pp.2506-2512
Publication Date: 2013/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.2506
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Adaptive Array Antennas/MIMO
spatial correlation coefficient,  MIMO,  propagation channel,  

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Spatial correlation is an index for evaluating performance of multi-antenna systems. Although various equations exist, the distinction remains evasive. This paper presents applicable condition of equations for spatial correlation coefficient considering propagation channels. We reveal that under Rayleigh fading environments, the spatial correlation is properly evaluated by the equation based on three-dimensional radiation patterns, however, under environments with strong direct waves, the equation based on the channel matrix should be used for the evaluation.