  In this paper, we present a relay-selection strategy for multi-way
cooperative multi-antenna systems that are aided by a central processor node,
where a cluster formed by two users is selected to simultaneously transmit to
each other with the help of relays. In particular, we present a novel multi-way
relay selection strategy based on the selection of the best link, exploiting
the use of buffers and physical-layer network coding, that is called Multi-Way
Buffer-Aided Max-Link (MW-Max-Link). We compare the proposed MW-Max-Link to
existing techniques in terms of bit error rate, pairwise error probability, sum
rate and computational complexity. Simulations are then employed to evaluate
the performance of the proposed and existing techniques.
