Abstract— Cognitive radio is an eminent technology that has been deployed in multiple communication systems in recent times. As in case of any communication system, the performance can be analyzed purely on the basis of transmitter and receiver. But it can be further enhanced by introducing relay concepts into the system. In a primary network, the data transmission takes place through a licensed channel. But at times the spectrum is not properly utilized and at that instant the secondary network comes into the picture, which takes care such that the efficiency of the spectrum shouldn’t be wasted. The secondary network consists of ST (Secondary Transmitter), SD (Secondary Destination) and Eavesdroppers. Here in the endeavor the main focus lies on the secondary network operations. The throughput of the network can be abruptly increased by introducing relays. To increase the overall system ability MIMO and OFDM techniques were implemented. The comparative analysis of the system with the single, multiple relays and the traditional direct transmission schemes has been done in order to analyze the system’s performance.
Keywords — Cognitive Radio, Eavesdropper, MIMO, OFDM, Relay Selection, Throughput.
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