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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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DOI

10.1007/s10764-013-9715-7

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1572-834X

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Performance evaluation of spatially multiplexed MI

Authors: Shreeram Sigdel Witold A Krzymień
Publish Date: 2007/04/13
Volume: 43, Issue: 2, Pages: 623-644
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Abstract

Transmit antenna selection in spatially multiplexed multipleinput multipleoutput MIMO systems is a low complexity lowrate feedback technique which involves transmission of a reduced number of streams from the maximum possible to improve the error rate performance of linear receivers It has been shown to be effective in enhancing the performance of singleuser interferencefree pointtopoint MIMO systems However performance of transmit antenna selection techniques in interferencelimited environments and over frequency selective channels is less well understood In this paper we investigate the performance of transmit antenna selection in spatially multiplexed MIMO systems in the presence of cochannel interference We propose a transmission technique for the downlink of a cellular MIMO system that employs transmit antenna selection to minimize the effect of cochannel interference from surrounding cells Several transmit antenna selection algorithms are proposed and their performance is evaluated in both frequency flat and frequency selective channels Various antenna selection algorithms proposed in the literature for single user MIMO links are extended to a cellular scenario where each user experiences cochannel interference from the other cells intercell interference in the system For frequency selective channels we consider orthogonal frequency division multiplexing OFDM with MIMO We propose a selection algorithm that maximizes the average output SINR over all subcarriers A method to quantify selection gain in frequency selective channel is discussed The effect of delay spread on the selection gain is studied by simulating practical fading environments with different delay spreads The effect of the variable signal constellation sizes and the number of transmitted streams on the bit error rate BER performance of the proposed system is also investigated in conjunction with the transmit antenna selection Simulation results show that for low to moderate interference power significant improvement in the system performance is achievable with the use of transmit antenna selection algorithms Even though the gain due to selection in frequency selective channels is reduced compared to that in flat fading channels due to the inherent frequency diversity the performance improvement is significant when the system is interference limited The performance improvement due to reduced number of transmit streams at larger signal constellation sizes is found to be more significant in spatially correlated scenarios and the gain due to selection is found to be reduced with the increased delay spread It is found that employing transmit antenna selection algorithms in conjunction with adaptation of the number of transmitted streams and the signal constellation sizes can significantly improve the performance of MIMO systems with cochannel interference

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