Cognitive with Two-Path MIMO System Relaying

Abstract

In this paper, a MIMO Cognitive Radio system using two-path relaying with amplify and forward protocol is investigated. The Cognitive Radio system, the primary user (PU) transmitter cooperates with the secondary user (SU) transmitter and receiver to send the PU data to the PU destination. All the nodes are equipped with multiple antennas. The investigated cognitive radio system is different from the conventional one in such a way, it uses the inter-relay interference (IRI) between the two relays to transmit SU data and minimize IRI effect on the PU destination. Two different techniques are used to detect the data in the destination which are Full Interference Cancellation and Zero Forcing techniques. Computer Simulations are used to evaluate the performance of the system. The performance is measured in terms of bit error rate. The effect of channel estimation error on the BER performance is also studied.