Multinode Cooperative Communications in Wireless Networks
IEEE Transactions on Signal Processing
Diversity through coded cooperation
IEEE Transactions on Wireless Communications
Modulation and demodulation for cooperative diversity in wireless systems
IEEE Transactions on Wireless Communications
Diversity order analysis of the decode-and-forward cooperative networks with relay selection
IEEE Transactions on Wireless Communications - Part 2
Threshold Selection for SNR-based Selective Digital Relaying in Cooperative Wireless Networks
IEEE Transactions on Wireless Communications - Part 1
Asymptotic BER analysis of threshold digital relaying schemes in cooperative wireless systems
IEEE Transactions on Wireless Communications - Part 1
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
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Error propagation from the relay to the destination is a major drawback of digital relaying protocols that substantially diminishes the cooperative diversity gain of the system. Appropriately designed selection relaying schemes can effectively mitigate this phenomenon and improve the diversity order, specifically when the source-relay channel state information (CSI) is not available at the destination. In this paper, we investigate the SNR-based selection relaying scheme and present a closed-form expression for the end-to-end symbol error probability (SEP) of the system for M-PSK modulation. The optimal threshold which minimizes the end-to-end SEP and provides full diversity order is also presented in closed-form. In our analysis, we examine the error propagation scenario in detail and derive a closed-form expression for the SEP under this scenario. Numerical results demonstrate that the SNR-based selection relaying scheme by employing the optimal threshold, without using error detection codes that reduce the bandwidth efficiency, effectively mitigates the error propagation and significantly improves the diversity order.