Convex Optimization
Power-optimized amplify-and-forward multi-hop relaying systems
IEEE Transactions on Wireless Communications
Distributed Adaptive Power Allocation for Wireless Relay Networks
IEEE Transactions on Wireless Communications
Joint Power Minimization in Wireless Relay Channels
IEEE Transactions on Wireless Communications
Improving amplify-and-forward relay networks: optimal power allocation versus selection
IEEE Transactions on Wireless Communications
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
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Optimal power allocation is a critical approach to realize the full potentials of relay-assisted transmission promised by the recent information-theoretic results. In this paper an optimal power allocation scheme that maximizes the instantaneous signal-to-noise ratio (SNR) in an amplify-an-forward (AF) multi-hop multi-branch transmission system is proposed. By considering an asymptotic expression for the SNR we formulate our optimization problem as two standard geometric programming (GP) problems. By solving these problems we present an optimum power allocation algorithm which at first performs a branch selection phase, and then, derive an optimal power allocation coefficient for source and relay nodes of the selected branches. Optimized power allocation demonstrates a significant performance gain over the uniform power allocation. Simulation results are provided which verify the received SNR and consequently the outage performance are increased with optimal power allocation in Rayleigh fading channel.