Throughput enhancement to the Cognitive Radio networks under the precaution is better than the cure (PBC) approach

In this paper, we have proposed a Cognitive Radio system where primary users uses the precautionary measures against the possible interferences that may disturb their quality of service (QOS), these interferences may be originated from any other primary user itself, possibly due to the effect of the hidden terminal problem or may be received from the secondary user end. The proposed approach is carried with the cooperation of the primary users where they perform the task of data transmission and spectrum sensing simultaneously, using our proposed receiver and frame structures. The proposed cognitive radio system works beyond the sensing-throughput tradeoff, overcomes the hidden terminal problem of the secondary as well as the primary users and increases awareness of the primary users against the interferences that can harm their performance, hence facilitates them with the maximum quality of service. More specifically, the probability of detection of the secondary users is increased dramatically even for the low signal to noise ratio (SNR) of the primary user received at the secondary user end. In other words, the licensed spectrum can be best exploited in an unlicensed manner even for the low SNR region, while allowing maximum protection to the primary users.