Analyses of Antenna Displacement in Short-Range MIMO Transmission over Millimeter-Wave

Ken HIRAGA  Tomohiro SEKI  Kentaro NISHIMORI  Kenjiro NISHIKAWA  Ichihiko TOYODA  Kazuhiro UEHARA  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.10    pp.2891-2895
Publication Date: 2011/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2891
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
short-range,  MIMO,  millimeter-wave,  antennas,  parallel transmission,  

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Short-range multiple-input and multiple-output (SR-MIMO) has attracted much attention, because the technique makes it possible to raise channel capacity to several hundred Gbit/s by utilizing the millimeter-wave band (e.g., 60 GHz band). Although the opposed transceiving antennas are assumed to be accurately positioned in previous studies regarding SR-MIMO, a very important issue is to evaluate the performance degradation due to displacement between MIMO transceivers. In SR-MIMO over the millimeter-wave band, any displacement is perceived as significant because the wavelength is small. This paper evaluates the influence on SR-MIMO transmission performance over millimeter-wave caused by displacement between the transmitting and receiving antennas. The channel capacity is found to degrade by 5% when the horizontal displacement is 1 mm and by 2.7% when the rotational displacement is 10 degrees. In addition, comparing performances obtained with a number of antenna array arrangements clarifies that a square pattern arrangement is suitable for short-range wireless transmission.