Implementation of Spectrum Sensing Based on Covariance in Cognitive Radio

Spectrum sensing is a fundamental problem in cognitive radio communication system. In this paper, the implementations of spectrum sensing based on the Covariance Absolute Value (CAV) on the test bed of cognitive radio system are presented. This demo cognitive radio system uses the spectrum holes which are determined by sensing for communication with the spectrum from 694MHz to 806MHz and can avoid impact immediately when detecting the primary users (no mater digital television or analog television) at working spectrum. The implementation further reduces the computational complexity and makes a great significance in practical applications. A series of tests show that the detection performance of Covariance Absolute Value is not liable to be affected by the noise uncertainty in practical application and meets the need of the system primly. Furthermore, the performances of detection are also verified with different kinds of source signals.