MIMO E-SDM Transmission Performance in an Actual Indoor Environment

Hiroshi NISHIMOTO  Yasutaka OGAWA  Toshihiko NISHIMURA  Takeo OHGANE  

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.6    pp.1474-1486
Publication Date: 2007/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.6.1474
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
MIMO,  eigenbeam space division multiplexing,  array element pattern,  eigenvalue distribution,  channel capacity,  bit error rate,  

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MIMO systems using a space division multiplexing (SDM) technique in which each transmit antenna sends an independent signal substream have been studied as one of the successful applications to increase data rates in wireless communications. The throughput of a MIMO channel can be maximized by using an eigenbeam-SDM (E-SDM) technique, and this paper investigates the practical performance of 22 and 44 MIMO E-SDM based on indoor measurements. The channel capacity and bit error rate obtained in various uniform linear array configurations are evaluated and are compared with the corresponding values for conventional SDM. Analysis results show that the bit error rate performance of E-SDM is better than that of SDM and that E-SDM gives better performance in line-of-sight (LOS) conditions than in non-LOS ones. They also show that the performance of E-SDM in LOS conditions depends very much on the array configuration.