We propose and analyze a distributed switch and stay combining network with selection relaying with an aim to reduce the complexity at the destination as well as to make efficient use of the degrees of freedom of the channels by exploiting a limited feedback signal from the destination.In particular, whenever the currently connected link (either from the source or from the best relay) to the destination is not favorable to decoding, the destination will switch to the alternative link as per the rule of switch and stay combining.The performance of the proposed system is derived in terms of outage probability and achievable spectral efficiency. The analytic results show that the proposed system assisted by the selection relaying exhibits a higher spectral efficiency than incremental relaying with selection relaying at low SNR regime. Monte-Carlo simulations are performed to verify the analysis.Index Terms-switch and stay combining, selection relaying, incremental relaying, decode-and-forward, Rayleigh fading, out age probability.

In this paper, we investigate the performance of the multi-input-multi-output (MIMO) relaying scheme, which combines the Alamouti code with fixed decode-and-forward (DF) protocol. Based on the relationship between the overall signalto-noise ratio (SNR) of the system and that of the weakest hop, the closed-form expressions of outage probability and bit error probability for PSK are derived. The analysis reveals that this scheme achieves the best performance in a limited hop under the spectral efficiency constraint. Various simulation results are performed to verify the analytic ones demonstrating the accuracy of the theoretical approach.

In this letter, we investigate the performance of distributed switch-and-stay network, an appropriate solution for low-complexity cooperative relaying applications, under adaptive transmission. Under Rayleigh fading channels, we are able to derive the closed-form expression of the occurrence probability, outage probability, bit error probability and achievable spectral efficiency of the system. Numerous simulations are performed to verify the analytic results showing that by applying adaptive modulation, the achievable spectral efficiency of the system is much improved.Index Terms-switch and stay combining, amplify-andforward, Rayleigh fading, outage probability, spectral efficiency, bit error rate, adaptive transmission.