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Research Article Ergodic Capacity for the SIMO | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 802067 9 pages doi 2009 802067 Research Article Ergodic Capacity for the SIMO Nakagami-m Channel Efstathios D. Vagenas Petros Karadimas and Stavros A. Kotsopoulos Wireless Telecommunications Laboratory Department of Electrical and Computer Engineering University of Patras 26500 Rio Patras Greece Correspondence should be addressed to Efstathios D. Vagenas svagenas@ Received 10 February 2009 Revised 28 May 2009 Accepted 1 July 2009 Recommended by Gabor Fodor This paper presents closed-form expressions for the ergodic channel capacity of SIMO single-input and multiple output wireless systems operating in a Nakagami-m fading channel. As the performance of SIMO channel is closely related to the diversity combining techniques we present closed-form expressions for the capacity of maximal ratio combining MRC equal gain combining EGC selection combining SC and switch and stay SSC diversity systems operating in Nakagami-m fading channels. Also the ergodic capacity of a SIMO system in a Nakagami-m fading channel without any diversity technique is derived. The latter scenario is further investigated for a large amount of receive antennas. Finally numerical results are presented for illustration. Copyright 2009 Efstathios D. Vagenas et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction In recent years the use of multiantenna systems provides large spectral efficiency for wireless communications in the presence of multipath fading environments. Multiple antennas can be used at the transmitter MISO the receiver SIMO or at both of them MIMO . A SIMO system can be viewed as an antenna diversity scheme diversity in space . Also diversity combining is known to be a powerful

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