Patent ID: 8494095
Filing Date: 2013-07-23
Classification: H04L

Abstract:
1. A method of detecting a presence of a transmission signal, sent by a transmitter, in a reception signal in a wireless communication system based on Cognitive Radio (CR) technology, the method comprising: generating a frequency signal vector using a Fourier transform and a reception signal vector obtained by sampling the reception signal at a certain period; finding an eigenvalue and an eigenvector of a matrix obtained by approximating a covariance matrix of the frequency signal vector by using a vectorized Fourier transform result of a channel impulse response of a transmission signal; calculating a sufficient statistic on a basis of the frequency signal vector, the eigenvalue, and the eigenvector; finding a threshold which is a criterion for determining signal presence detection on a basis of a preset detection probability or a preset false alarm probability and the eigenvalue; and if, as a result of the determination, the sufficient statistic is greater than the threshold, determining that the transmission signal exists.