Relay based cooperative spectrum sensing in cognitive radio network

The cognitive nodes which are far away from primary user (PU) may not be able to detect the PU due to severe fading in channel. To improve the efficiency of spectrum sensing, we propose a co operative communication scheme based on cognitive relaying. Cognitive relay nodes sense the activity of PU and forward the received data to the Cognitive radio (CR) which is far a way from the PU. In this condition, the probability of detection increases, which in turn reduces the bit error rate (BER). Employment of an umber of relay nodes reduces the sensing time and increases the throughput of the system.