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We study a cooperative network with a buffer-aided multi-antenna source,multiple half-duplex (HD) buffer-aided relays and a single destination. Such asetup could represent a cellular downlink scenario, in which the source can bea more powerful wireless device with a buffer and multiple antennas, while aset of intermediate less powerful devices are used as relays to reach thedestination. The main target is to recover the multiplexing loss of the networkby having the source and a relay to simultaneously transmit their informationto another relay and the destination, respectively. Successive transmissions insuch a cooperative network, however, cause inter-relay interference (IRI).First, by assuming global channel state information (CSI), we show that thedetrimental effect of IRI can be alleviated by precoding at the source,mitigating or even fully cancelling the interference. A cooperative relayingpolicy is proposed that employs a joint precoding design and relay-pairselection. Note that both fixed rate and adaptive rate transmissions can beconsidered. For the case when channel state information is only available atthe receiver side (CSIR), we propose a relay selection policy that employs aphase alignment technique to reduce the IRI. The performance of the twoproposed relay pair selection policies are evaluated and compared with otherstate-of-the-art relaying schemes in terms of outage and throughput. Theresults show that the use of a powerful source can provide considerableperformance improvements.

Relay-Pair Selection in Buffer-Aided Successive Opportunistic Relaying using a Multi-Antenna Source