Cooperative Communication By Using Cognitive Radio Networks

The growing demand for the spectrum has made it necessary to utilize the available resources in an efficient and sustainable manner. The cognitive radio (CR) system is an approach where the unutilized spectrum of primary user (PU) is used by the secondary user (SU). The SU compares PU signal with a threshold to detect the freely available channel. Thus, there is a need for an appropriate threshold. Therefore it is necessary to have an optimum threshold by minimizing the probability of false alarm rate. We try to implement a cooperative communication using cognitive radio Spectrum sensing technique by the combinations of different methods which exists in the literature, like Energy detection, Cyclostationary feature detection and matched filter detection etc. The main aim of our proposed system is to increase the probability of signal detection by using Cooperative Communication among Secondary Users and to minimize the rate of false detection, the cooperative communications among cognitive users provides better results when compared to independent (non-cooperative) specteum sensing & ensuring minimum interference to the licensed user