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Relay Selection and Resource Allocation for Two-Way DF-AF Cognitive Radio Networks

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3 Author(s)
Alsharoa, A. ; Comput., Electr., & Math. Sci. of Eng. (CEMSE) Div., King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia ; Bader, F. ; Alouini, M.

In this letter, the problem of relay selection and optimal resource allocation for two-way relaying cognitive radio networks using half duplex amplify-and-forward and decode-and-forward protocols is investigated. The primary and secondary users are assumed to access the spectrum simultaneously, in a way that the interference introduced to the primary users should be below a certain tolerated limit. Dual decomposition and subgradient methods are used to find the optimal power allocation. A suboptimal approach based on a genetic algorithm is also presented. Simulation results show that the proposed suboptimal algorithm offers a performance close to the optimal performance with a considerable complexity saving.

Published in:

Wireless Communications Letters, IEEE  (Volume:2 ,  Issue: 4 )