Optimal power allocation for relayed transmissions over Rayleigh-fading channels
IEEE Transactions on Wireless Communications
BER-Optimized Power Allocation for Fading Relay Channels
IEEE Transactions on Wireless Communications
Capacity bounds and power allocation for wireless relay channels
IEEE Transactions on Information Theory
Exponential Diversity Achieving Spatio–Temporal Power Allocation Scheme for Fading Channels
IEEE Transactions on Information Theory
Multihop Relaying for Broadband Wireless Mesh Networks: From Theory to Practice
IEEE Communications Magazine
Wireless relays for broadband access [radio communications series]
IEEE Communications Magazine
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We present and analyze two different power allocation strategies for considerably improving the average bit error rate (BER) performance of wireless multihop systems with an arbitrary number of regenerative relay stations. In both cases, the power allocation is done based on instantaneous channel state information subject to an overall sum power constraint as well as possible additional per-node power constraints and it is optimal in terms of minimizing an upper bound on the average end-to-end BER. It is shown that for a general class of fading distributions with both schemes exponential diversity can be achieved and we express the corresponding upper bounds on the average BER in closed-form for the important case of Nakagami-m fading on all hops. Finally, the performance of our approach is illustrated and evaluated by means of both numerical and simulation results.