New results are presented for the ergodic capacity of spatially-correlated, time-varying and frequency-selective (i.e., triply selective) MIMO Rayleigh fading channels. Simplified capacity formulas are also derived for special cases such as SIMO and MISO triply selective fading channels. A closed form formula is proposed that quantifies the effect of the frequency-selective fading on the ergodic capacity into an intersymbol interference (ISI) degradation factor. It is discovered that, in general frequency-selective MIMO channels, the ISI inter-tap correlations reduce the ergodic capacity compared to the frequency flat fading channel. Only in the special case when the fading does not have ISI inter-tap correlations will the ergodic capacity be the same as that of the frequency flat channel. The new capacity results are experimentally verified via Monte-Carlo simulations.

Meeting Name

IEEE Global Telecommunications Conference, 2004. GLOBECOM'04


Electrical and Computer Engineering

Keywords and Phrases

ISI Inter-Tap Correlations; MIMO Systems; MIMO Triply Selective Channels; MISO Channels; Monte Carlo Methods; Monte-Carlo Simulations; Rayleigh Channels; Rayleigh Fading Channels; SIMO Channels; Channel Capacity; Channel Ergodic Capacity; Correlation Methods; Frequency Flat Fading Channel; Frequency-Selective Channels; Intersymbol Interference; Intersymbol Interference Degradation Factor; Spatially-Correlated Channels; Time-Varying Channels

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2004 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2004