Abstract
In this letter, an optimal power allocation scheme between the secondary transmitter (ST) and secondary relay (SR) with best relay selection is proposed for a two-hop decode and forward cognitive relay network. Based on the joint consideration of the interference from ST and SR to the primary user (PU), the closed-form solution for optimal power allocation and relay selection (PARS) is presented under the quality of service (QoS) constraint of the PU transmission. Furthermore, a low complexity sub-optimal scheme is proposed. Simulation results verify the performance improvement of the proposed schemes.
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