Performance Evaluation of Various Cooperative Spectrum Sensing Algorithms for Reducing Communication Overheads

Due to the unavoidable use of mobile phone and another data communication as a result we face the problem of spectrum scarcity. Within the current spectrum regulatory framework, however, all of the frequency bands are exclusively allocated to specific services and no violation from unlicensed users is allowed.But as we know that most of the time band is either not utilized or underutilized. The problem of spectrum scarcity and spectrum under-utilization can be solved by the use of cognitive radio spectrum sensing. But due to deep fading and shadowing spectrum sensing highly degrades. As all we know that if secondary users cooperate with each other, spectrum efficiency and most of the other problem such as hidden terminal problem, loss in spectrum utilization can be solved. A comparison study is made in between various algorithms which is proposed to overcome these problems in this paper. Keywords—Cognitive radio, spectrum sensing, , cooperative sensing,multi-path fading, communication overheads. --------------------------------------------------------------------***-----------------------------------------------------------------