Accurate approximations for the capacity distribution of OFDM-based spatial multiplexing

Matthew R. McKay*, Peter J. Smith, Himal A. Suraweera, Iain B. Collings

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication2007 IEEE International Conference on Communications, ICC'07
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages5377-5382
Number of pages6
ISBN (Print)1424403537, 9781424403530
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event2007 IEEE International Conference on Communications, ICC'07 - Glasgow, Scotland, United Kingdom
Duration: 24 Jun 200728 Jun 2007

Other

Other2007 IEEE International Conference on Communications, ICC'07
CountryUnited Kingdom
CityGlasgow, Scotland
Period24/06/0728/06/07

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