QR Decomposition-Based Antenna Selection for Spatial Multiplexing UWB Systems with Zero-Forcing Detectors Followed by Rake Combiners

Sangchoon KIM

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.1    pp.337-340
Publication Date: 2012/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.337
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
ultra-wideband (UWB),  multiple input multiple output (MIMO),  zero-forcing (ZF),  rake combiner,  QR decomposition,  transmit antenna selection,  

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This letter presents a criterion for selecting a transmit antenna subset when ZF detectors followed by Rake combiners are employed for spatial multiplexing (SM) ultra-wideband (UWB) multiple input multiple output (MIMO) systems. The presented criterion is based on the largest minimum post-processing signal to interference plus noise ratio of the multiplexed streams, which is obtained on the basis of QR decomposition. Simulation results show that the proposed antenna selection algorithm considerably improves the BER performance of the SM UWB MIMO systems when the number of multipath diversity branches is not so large and thus offers diversity advantages on a log-normal multipath fading channel.