OFDM-Based Spatial Multiplexing: Exact Variance and Outage Approximation

  • Matthew R. Mckay
  • Peter J. Smith
  • Senior Member
  • Himal A. Suraweera Member
  • Iain B. Collings
  • Senior Member
Publication date
August 2016

Abstract

Abstract — This paper considers the distribution of the mu-tual information of frequency-selective spatially-uncorrelated Rayleigh fading MIMO channels. Results are presented for OFDM-based spatial multiplexing. New exact closed-form expres-sions are derived for the variance of the mutual information. In contrast to previous results, our new expressions apply for systems with both arbitrary numbers of antennas and arbitrary-length channels. Simplified expressions are also presented for high and low SNR regimes. The analytical variance results are used to provide accurate analytical approximations for the distribution of the mutual information and the outage capacity

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