Nonregenerative dual-hop cooperative links with selection diversity
EURASIP Journal on Wireless Communications and Networking
IEEE Transactions on Wireless Communications
Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment
IEEE Transactions on Wireless Communications
Approximating a Sum of Random Variables with a Lognormal
IEEE Transactions on Wireless Communications
Improving amplify-and-forward relay networks: optimal power allocation versus selection
IEEE Transactions on Wireless Communications
Distributed beamforming and power allocation for cooperative networks
IEEE Transactions on Wireless Communications - Part 2
On the performance of amplify-and-forward cooperative systems with fixed gain relays
IEEE Transactions on Wireless Communications - Part 2
On the Ergodic Capacity of Wireless Relaying Systems over Rayleigh Fading Channels
IEEE Transactions on Wireless Communications - Part 2
IEEE Transactions on Wireless Communications - Part 2
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
Wireless Communications & Mobile Computing
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Low complexity receivers for coherent amplify-and-forward (AF) cooperative diversity systems are developed. According to the availability of phase information at the relays and the destination, repetition-based and spectral-efficient distributed equal gain combining (DEGC) schemes are developed. In the former scheme, relays transmit over separate orthogonal subchannels, whereas in the latter scheme all relays transmit simultaneously. Analytical expressions for evaluation of the average output signal-to-noise ratio (SNR) and symbol error probability are derived and it is demonstrated that these schemes achieve full spatial diversity. In addition, upper and lower bounds on the ergodic capacity are obtained. The upper bound is tight in small-SNR regions whereas the lower bound is accurate for sufficiently large values of SNR. It is shown that the spectral-efficient DEGC scheme outperforms the repetition-based DEGC scheme especially by increasing the number of relays. The impact of combining loss on the performance of the proposed schemes is also studied. The average output SNR expression can be used as a simple theoretical tool for choosing the best number of relays that avoids the combining loss.