On the channel capacity of multiantenna systems with Nakagami fading

Authors:
Feng Zheng;Thomas Kaiser
Affiliations:
Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland;Department of Communication Systems, Faculty of Electrical Engineering, University Duisburg-Essen, Duisburg, Germany
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2006

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Abstract

We discuss the channel capacity of multiantenna systems with the Nakagami fading channel. Analytic expressions for the ergodic channel capacity or its lower bound are given for SISO, SIMO, and MISO cases. Formulae for the outage probability of the capacity are presented. It is shown that the channel capacity could be increased logarithmically with the number of receive antennas for SIMO case; while employing 3-5 transmit antennas (irrespective of all other parameters considered herein) can approach the best advantage of the multiple transmit antenna systems as far as channel capacity is concerned for MISO case. We have shown that for a given SNR, the outage probability decreases considerably with the number of receive antennas for SIMO case, while for MISO case, the upper bound of the outage probability decreases with the number of transmit antennas when the transmission rate is lower than some value, but increases instead when the transmission rate is higher than another value. A critical transmission rate is identified.