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In this paper we analyze the performance of multiple relay networks when multiple antennas are deployed only at the relays. We apply minimum selection combining (MSC) scheme to select and combine the received signals at the relays. The channel is assumed to be Rayleigh flat fading. The performance of the network is investigated for known and estimated channel and for both decode-and-forward and amplify-and forward protocols. Channel estimation is performed using least square algorithm. The performance is compared with the performance of the network when the multiple antennas of the relays are combined using maximal ratio combiner (MRC). We show that reduction in complexity is achieved for decode-and-forward and amplify-and forward relaying protocols, with some sacrifices in performance.

Multiple Antenna Selection of Multi-Antenna Relays Using MSC Scheme