Accurate Approximations for the Capacity Distribution of OFDM-Based Spatial Multiplexing (2007)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Electrical and Computer Engineering.
AuthorsMcKay, M.R., Smith, P.J., Suraweera, H.A., Collings, I.B.show all
We derive new analytic approximations to the capacity distribution of frequency-selective Rayleigh fading MIMO channels. The results apply specifically to OFDM-based spatial multiplexing. In particular, we present a new closed-form Gaussian approximation which yields very high accuracy in many scenarios. For the low SNR regime, we also present a new simpler closed-form Gamma approximation, which we show to be even more accurate than Gaussian in this case. Our approximations are based on new exact closed-form expressions which we derive for the variance of the mutual information which, in contrast to previous results, apply for systems with both arbitrary numbers of antennas and arbitrary-length channel delay profiles.
CitationMcKay, M.R., Smith, P.J., Suraweera, H.A., Collings, I.B. (2007) Accurate Approximations for the Capacity Distribution of OFDM-Based Spatial Multiplexing. Glasgow, UK: 2007 IEEE International Conference on Communications (ICC2007), 24-28 Jun 2007. 5377-5382.
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