Abstract

In this paper, we consider an underlay cognitive radio network (CRN) comprising of a cognitive base station (CBS) and multiple multicast group of secondary users (SUs). A common primary user (PU) channel is used to support downlink transmission to all SUs of a common multicast group. Our objective is to maximize the overall energy efficiency (EE) for the multicast CRN. The problem is formulated using constrained optimization framework under PUs' outage probability constraint and CBS's average transmit power constraint. With the aid of fractional programming, an algorithm is proposed to allocate optimal power to each multicast group, which maximizes EE of the CRN. Simulation results are presented to validate the proposed power allocation scheme.

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