Bit error rate of the primary user in a cognitive relay network over Rayleigh-fading channels
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Signal transmission with unequal error protection in wireless relay networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Optimal SNR-based selection relaying scheme with M-PSK modulation in cooperative wireless systems
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Adaptive relaying in noncoherent cooperative networks
IEEE Transactions on Signal Processing
EURASIP Journal on Wireless Communications and Networking
Threshold-based relay selection for detect-and-forward relaying in cooperative wireless networks
EURASIP Journal on Wireless Communications and Networking
Opportunistic Decode-and-Forward Relaying with Interferences at Relays
Wireless Personal Communications: An International Journal
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Threshold relaying is an effective technique to achieve cooperative diversity in uncoded cooperative wireless networks, which suffer from error propagation due to detection errors at the relays. This paper analyzes the asymptotic end-to-end (e2e) bit error rate (BER) of threshold digital relaying. A three node network with a source, destination and relay and with links experiencing independent Rayleigh fading is considered. It is shown that, as the average link signal-to-noise ratios (SNR) are increased simultaneously, the optimal threshold that minimizes the e2e BER increases as log(SNR). The resulting e2e BER decreases as log(SNR)/SNR2. Moreover, any threshold of the form log(cSNR), where c is a positive constant, achieves the same order of e2e BER as the one achieved by the optimal threshold and provides dual diversity. A value of c that performs very close to the optimal threshold is also proposed.