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A Power Allocation Strategy for Multiple Poisson...
Journal article

A Power Allocation Strategy for Multiple Poisson Spectrum-Sharing Networks

Abstract

This paper develops a power allocation strategy for multiple networks of Poisson-distributed single-antenna nodes that share the available spectrum in a spectrum underlay scenario. This strategy aims to maximize the overall throughput obtained by sharing the spectrum while limiting the degradation of the successful transmission probability of each network. In its original form, this joint power allocation problem is difficult to solve. However, we demonstrate that the problem can be transformed into a convex optimization formulation, which can be efficiently solved. Furthermore, we obtain a quasi-closed-form solution that has a water-filling interpretation by analyzing the optimality conditions. Numerical results indicate that, when a spectrum-sharing scheme employs the proposed optimal strategy of power allocation, the throughput substantially improves over that obtained by exclusively allocating the spectrum to the primary network. Moreover, when the number of spectrum-sharing networks increases, the enhancement is significant, being up to the limit imposed by the maximum allowable degradation in the performance of each network.

Authors

Cai R; Zhang J-K; Davidson TN; Zhang W; Wong KM; Ching PC

Journal

IEEE Transactions on Wireless Communications, Vol. 14, No. 4, pp. 1785–1799

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Publication Date

April 1, 2015

DOI

10.1109/twc.2014.2372772

ISSN

1536-1276

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