A cooperative spectrum sensing algorithm based on location information is proposed

and the core of the algorithm isusing spatial location information of cognitive users to determine availability of target spectrums. The algorithm may consists of two parts: 1) A cooperative two-step spectrum sensing scheme which uses a hard combination for sensing results of cognitive users. 2) Relative location information of cognitive users is derived in the detection process of primary signal. The existence information of primary signal and location information are used by cognitive users to judge availability of target spectrums to improve performance of spectrum sensing.