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Power allocation for non-orthogonal decode-and-forward cooperation protocol

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Abstract

This paper studies the power allocation problem for the non-orthogonal decode-and-forward (NDF) cooperation protocol with selection relaying. With the availability of the magnitudes of all channel gains at the source, the power allocation is explored that maximizes the mutual information between the source and destination subject to a total power constraint. The minimum power that avoids the outage of the relay is set as a condition, under which the power allocation problem becomes one of selecting the optimal one from several allocation factor triplets. It is shown that the power allocation scheme can provide considerable performance gain, and the non-orthogonal cooperation protocol is superior to the orthogonal protocol and direct transmission.

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Correspondence to Yong Zhang.

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Supported by the Project of Natural Science Foundation of Jiangsu Province (Grant No. BK2006701), the National Natural Science Foundation of China (Grant No. 60672079), and the National High-Tech Research & Development Program of China (Grant No. 2007AA01Z267)

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Zhang, Y., Xu, Y. & Cai, Y. Power allocation for non-orthogonal decode-and-forward cooperation protocol. Sci. China Ser. F-Inf. Sci. 52, 1037–1042 (2009). https://doi.org/10.1007/s11432-009-0018-8

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  • DOI: https://doi.org/10.1007/s11432-009-0018-8

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