Parallel Co-Operative Spectrum Sensing Using Wavelet Transform
In cognitive radio networks, spectrum sensing is a crucial component in the discovery of spectrum opportunities for secondary systems (or unlicensed systems). Cognitive radio is used to allow the unlicensed user to use the band of primary user. Cognitive radio is used to solve spectrum scarcity and spectrum underutilization problem. The performance of spectrum sensing is characterized by both accuracy and efficiency. Cooperative energy detection based spectrum sensing has been proved effective to identify the spectrum holes in Cognitive Radio. Spectrum sensing is done to locate unused spectrum segment and optimally use these segment without harmful interference to licensed user. During the sensing period, each secondary user senses the different channel to improve the spectrum sensing efficiency.