IEEE Transactions on Wireless Communications
Equalization Techniques for Distributed Space-Time Block Codes With Amplify-and-Forward Relaying
IEEE Transactions on Signal Processing
Distributed space-time coding for regenerative relay networks
IEEE Transactions on Wireless Communications
Power Allocation Schemes for Amplify-and-Forward MIMO-OFDM Relay Links
IEEE Transactions on Wireless Communications
Cooperative communications protocol for multiuser OFDM networks
IEEE Transactions on Wireless Communications
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Variable-Rate Two-Phase Collaborative Communication Protocols for Wireless Networks
IEEE Transactions on Information Theory
Fading relay channels: performance limits and space-time signal design
IEEE Journal on Selected Areas in Communications
IEEE Transactions on Wireless Communications
Transparent amplify-and-forward relaying in MIMO relay channels
IEEE Transactions on Wireless Communications
A precoded OFDMA system with user cooperation
EURASIP Journal on Wireless Communications and Networking - Special issue on theoretical and algorithmic foundations of wireless ad hoc and sensor networks
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In this paper, we investigate a cooperative system with multiple relays and amplify-and-forward relaying over frequency-selective channels. To extract the available rich multipath diversity, we employ orthogonal frequency division multiplexing (OFDM) with precoding. Through the derivation of pairwise error probability (PEP), we demonstrate that the maximum diversity order is given by the summation of the channel length in the direct link and the minimum of channel lengths in each relaying link which is further confirmed by simulation results. Based on the PEP expression, we also propose two relay selection strategies; one is on per-subcarrier basis and the other is on all-subcarriers basis. Our simulation results indicate that both strategies result in performance improvements.