Transmit selection in spatial multiplexing systems

Author

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

Author_Institution

Inf. Syst. Lab., Stanford Univ., CA, USA

Volume

6

Issue

11

fYear

2002

Firstpage

491

Lastpage

493

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 signal-to-noise ratio on the kth stream is a weighted Chi-squared variable with the weight equal to-the kth 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; Monte Carlo methods; correlation methods; error statistics; matrix algebra; multiplexing; transmitting antennas; MIMO communication links; Monte Carlo simulations; Wishart matrix analysis; ZF receiver; average error probability minimization; channel statistics; ergodic capacity maximization; inverted transmit correlation matrix; signal-to-noise ratio; transmit antenna selection; weighted Chi-squared variable; zero forcing spatial multiplexing system; Costs; MIMO; Radio frequency; Rayleigh channels; Receiving antennas; Scattering; Signal to noise ratio; Statistics; Transmitters; Transmitting antennas;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2002.805517

Filename

1049154