Transmit Selection in Spatial Multiplexing Systems

Authors:

Dhananjay A. Gore, Robert W. Heath Jr, and Arogyaswami J. Paulraj

Reference:

To appear in IEEE Communications Letters, 2002. 

Abstract:

 In this letter we solve the transmit antenna selection problem for a zero forcing spatial multiplexing system with knowledge of the channel statistics at the transmitter. We show through Wishart matrix analysis that the SINR on the k-th stream is a weighted Chi-squared variable with weight equal to the k-th diagonal entry of the inverted transmit correlation matrix. We use this result to develop selection algorithms for two cases - maximizing ergodic capacity and minimizing the average probability of error. Monte Carlo simulations illustrate potential performance improvements. 

Keywords:

MIMO systems, adaptive antenna arrays, antenna selection, and link adaptation.

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