Innovative Antennas and Propagation Studies for MIMO Systems

Yoshio KARASAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.9   pp.2194-2202
Publication Date: 2007/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.9.2194
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
MIMO,  MIMO channel model,  SVD,  multi-keyhole,  dual-polarization antenna,  triple-polarization antenna,  MIMO-OFDM,  

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Summary: 
This paper reviews our recent antennas and propagation studies for MIMO systems. First we introduce a MIMO propagation channel model in which an interesting nature can be found in eigenvalue statistics from a practical viewpoint. Then we introduce multi-keyhole model which is an efficient tool for designing a MIMO repeater systems, or MIMO radio-relay systems. For realization of compact MIMO antenna systems, effectiveness of using multiple polarizations such as dual polarizations and triple polarizations is demonstrated in multipath-rich propagation environments. With application of MIMO to OFDM systems, we focus our analysis on relation between propagation and digital transmission characteristics under a severe multipath-rich environment where the delay profile exceeds the guard interval. Finally, we discuss transmission characteristics of MIMO-OFDM with maximal ratio combining (MRC) diversity in the environment.