This study addresses the energy efficiency (EE) maximisation problem in multi‐input multi‐
output cognitive relay networks, where a secondary transmitter–receiver pair communicates …

This paper analyses the joint relay selection and pre-coder designing problem for underlay
cognitive relay networks (CRNs) where each node is equipped with multiple antennas. We …

This paper addresses the energy efficiency (EE) maximization problem for a multi-input multi-
output cognitive two-way relay network. The secondary system, comprises of a two-way …