Transmit Selection in Spatial Multiplexing Systems


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


To appear in IEEE Communications Letters, 2002. 


 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. 


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

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