Cooperative dual-hop relaying systems with beamforming over Nakagami-m fading channels
IEEE Transactions on Wireless Communications
SER analysis and PDF derivation for multi-hop amplify-and-forward relay systems
IEEE Transactions on Communications
A performance study of dual-hop transmissions with fixed gain relays
IEEE Transactions on Wireless Communications
Cooperative relaying in multi-antenna fixed relay networks
IEEE Transactions on Wireless Communications
Multiple-Antenna Cooperative Wireless Systems: A Diversity–Multiplexing Tradeoff Perspective
IEEE Transactions on Information Theory
Relay-based deployment concepts for wireless and mobile broadband radio
IEEE Communications Magazine
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This paper presents a scheme for dual-hop amplify-and-forward multi-antenna, multi-relay selection over Nakagami-m fading channels. A source-selected best relay performs maximal ratio combining on received data, applies variable gain, and then uses beamforming to transmit to a destination device. Such a configuration is beneficial for end-to-end communication using single antenna mobile terminals with a multi-antenna relay infrastructure. Closed form expressions for performance metrics are derived that cater for arbitrary number of relays, arbitrary number of receive and transmit antennas and different fading parameters. Results are verified through simulation. Furthermore, the influence of multiple antennas, the effects of fading, power imbalance between hops, and the beneficial impact of additional relays are explored.