Likelihood ratio test for wideband spectrum sensing

In this paper, we propose a novel detection scheme of spectrum sensing for cognitive radio with multiple receive antennas operating over a wideband channel composed of a multitude of subbands. By taking the observations in all subbands into consideration in the likelihood ratio test for sensing a subband, the proposed scheme can provide better performance than other conventional schemes. It is shown through computer simulations that the proposed scheme can provide considerable performance gains over conventional schemes for wideband spectrum sensing.