Principles of mobile communication (2nd ed.)
Principles of mobile communication (2nd ed.)
Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment
IEEE Transactions on Wireless Communications
Optimal power allocation for relayed transmissions over Rayleigh-fading channels
IEEE Transactions on Wireless Communications
Symbol error probabilities for general Cooperative links
IEEE Transactions on Wireless Communications
On energy efficiency and optimum resource allocation of relay transmissions in the low-power regime
IEEE Transactions on Wireless Communications
Modulation and demodulation for cooperative diversity in wireless systems
IEEE Transactions on Wireless Communications
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Differential modulation for decode-and-forward multiple relay systems
IEEE Transactions on Communications
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The development of relay transmissions have recently attracted increasing interests in wireless communications since they provide cooperative diversity gains by forming virtual antenna arrays. In such relay networks, optimum energy allocation is critical to enhance their performance and efficiency. However, existing works on performance analysis and optimization mainly focus on single-relay systems. In this paper, an upper bound of the error performance is derived with arbitrary number of relays. Based on this bound, we then develop the optimum energy allocation schemes that minimize the average system error. Equally attractive is that our investigation is tailored for differential modulations, which bypass the channel estimation at the receiver and are particularly suitable for wireless relay networks. The performance improvement of the optimized systems over the un-optimized ones is confirmed by analytical and simulated comparisons