Single Front-End MIMO Architecture with Parasitic Antenna Elements

Mitsuteru YOSHIDA  Kei SAKAGUCHI  Kiyomichi ARAKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.3   pp.882-888
Publication Date: 2012/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.882
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
single front-end architecture,  parasitic antenna elements,  MIMO,  equal gain combining,  

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Summary: 
In recent years, wireless communication technology has been studied intensively. In particular, MIMO which employs several transmit and receive antennas is a key technology for enhancing spectral efficiency. However, conventional MIMO architectures require some transceiver circuits for the sake of transmitting and receiving separate signals, which incurs the cost of one RF front-end per antenna. In addition to that, MIMO systems are assumed to be used in low spatial correlation environment between antennas. Since a short distance between each antenna causes high spatial correlation and coupling effect, it is difficult to miniaturize wireless terminals for mobile use. This paper shows a novel architecture which enables mobile terminals to be miniaturized and to work with a single RF front-end by means of adaptive analog beam-forming with parasitic antenna elements and antenna switching for spatial multiplexing. Furthermore, statistical analysis of the proposed architecture is also discussed in this paper.