Wavelet and Matched Filter in Cognitive Radio for Spectrum Detection Process

[摘要] The Cognitive radio is used to allow the unlicensed user to use the band of licensed user. Spectrum scarcity and spectrum underutilization problem can be solved by using a cognitive radio. Accuracy and efficiency can be achieved in the system. The spectrum holes in Cognitive Radio can be detected by the use of a cooperative energy detection. Spectrum sensing is done to locate The unused spectrum segment is located by spectrum sensing. 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. Co-operative spectrum sensing is used to detect the spectrum availability in a cognitive radio environment and to avoid the interference factor such as multipath factor and shadow effect. Literature suggests that further improvement in accuracy of detection can be achieved using 1D&2D wavelet transforms. In this project, we are investigating the applicability of matched filter technique to improve the performance parameters of cognitive radio spectrum detection process.

[关键词] Cognitive radio;Energy detection;Cooperative spectrum sensing.