METHOD FOR SENSING SPECTRUM USING CORRELATION COEFFICIENTS AND SKEWNESS IN FREQUENCY DOMAIN

摘要

The present invention relates to a spectrum sensing method in a recognition wireless technology in a wireless communication field and to a spectrum sensing method using correlation coefficients and skewness in a frequency domain. According to the present invention, the spectrum sensing method effectively uses a frequency band which is the restricted resource by enabling various wireless devices to share the frequency band at the same time, by reducing damage to a first user on the white space, by satisfying with the threshold value determined in IEEE 802.22 WRAN, and by sensing the spectrum using the skewness and the correlation coefficients in the frequency domain. [Reference numerals] (AA) START;(BB) END;(S101) Moving the frequency of the received IF signal with -f_pilot;(S103) Down sampling after filtering using LPF;(S105) Division to N_FFT or N_dwell area;(S107) Obtaining absolute square of a FFT sample value by executing FFT in each section;(S109) Selecting elements around a pilot among Z_n[K];(S111) Obtaining distortion values in each section;(S113) Variable R calculation;(S115) Determining signal status by comparing R with a threshold value