A Comparison of Two MIMO Relaying Protocols in Nakagami-M Fading
Transmit Antenna Selection with receive Maximal-Ratio Combining (TAS/MRC) and Transmit Antenna Selection with Receive Selection Combining (TAS/SC) are two attractive Multiple-Input - Multiple-Output (MIMO) protocols. In this paper, the authors present a framework for the comparative analysis of TAS/MRC and TAS/SC in a two-hop amplify-and-forward relay network. In doing so, they derive exact and asymptotic expressions for the Symbol Error Rate (SER) in Nakagami-m fading. Using the asymptotic expressions, the SNR gap between the two protocols is quantified. Given that the two protocols maintain the same diversity order, they show that the SNR gap is entirely dependent on the array gain.