In this paper, we present a relaying scheme which combines the spectral efficiency of successive opportunistic relaying with the robustness of single-link selection. More specifically, we propose the min − power scheme that minimizes the total energy expenditure per time slot under an inter-relay interference (IRI) cancellation scheme. It is the first time that interference cancellation is combined with buffer-aided relays and power adaptation to mitigate the IRI and minimize the energy expenditure.The new relay selection policy is analyzed in terms of outage probability and diversity by modeling the evolution of the relay buffers as a Markov Chain. We construct the state transition matrix of the I. Krikidis is with the ECE Department, University of Cyprus, Nicosia 1678 (E-mail: krikidis@ucy.ac.cy).Preliminary results of this work have been published in [1]. This paper extends the work further through detailed algorithm description, discussion on channel state information schemes, outage probability and diversity analysis, extra illustrative examples and performance evaluation scenarios based on various system parameters.
In this work, we present a buffer-aided successive opportunistic relaying scheme that aims at improving the average capacity of the network when inter-relay interference arises between relays that are selected for simultaneous transmission and reception. We propose a relay selection policy that, by exploiting the benefits of buffering at the relays, decouples the receiving relay at the previous time slot to be the transmitting relay at the next slot. Furthermore, we impose an interference cancellation threshold allowing the relay that is selected for reception to decode and subtract the inter-relay interference. The proposed relaying scheme selects the relaying pair that maximises the average capacity of the relay network. Its performance is evaluated through simulations and comparisons with other state-of-the-art half-duplex and full-duplex relay selection schemes, in terms of outage probability, average capacity and average delay. The results reveal that a trade-off has to be made between improving the outage at the cost of reduced capacity and increased delay and vice versa. Finally, conclusions are drawn and future directions are discussed, including the need for a hybrid scheme incorporating both half-duplex and full-duplex characteristics.
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