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The authors propose the Quality-of-Service (QoS) driven power allocation scheme for wireless links under average and peak power constraints. By integrating information theory with the principle of effective capacity, their proposed scheme aims at maximizing the system throughput subject to a given delay-QoS constraint. Over the block fading channel, they derive the optimal power allocation scheme to maximize the effective capacity. The analyses and numerical results show that their optimal power allocation scheme converges to the despicking water-filling scheme when the QoS constraint becomes very loose.
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