Energy efficient relay precoder design for MIMO-cognitive relay network

This paper addressed the problem of designing the relay precoding matrix for multiple-input multiple-output-cognitive relay network (MIMO-CRN), where a secondary transmitter (SU-Tx) communicates to a secondary receiver (SU-Rx) with the aid of an amplify-and-forward relay, in the presence of primary user (PU). Here, the energy efficiency (EE) of the secondary system is maximized under the transmit power and interference threshold constraint. A fractional programming based algorithm is proposed to solve the energy efficient relay precoder design problem. Simulation results are presented to assess the effectiveness of the proposed scheme.