Patent ID: 8909242

Claim:
A cooperative spectrum sensing method of locationing primary transmitters in a cognitive radio (CR) system, each of the primary transmitters transmitting a power signal, the CR system including a number (N) of secondary users, which are randomly located in a predetermined area and are divided into a plurality of sets, and a plurality of CR base stations disposed in the predetermined area and corresponding respectively the sets of the secondary users, said method comprising the steps of: a) configuring each of the secondary users to obtain location information thereof, generate a received signal strength indicator (RSSI) value in response to sensing the power signals from the primary transmitters, and transmit the location information and the RSSI value such that each of the CR base stations receives and collects the location information and the RSSI values from a corresponding set of the secondary users; b) configuring each of the CR base stations to transmit the location information and the RSSI values collected thereby to a data fusion center through a backbone network such that the data fusion center receives the location information and the RSSI values associated with all the secondary users; and c) configuring the data fusion center to obtain the number and locations of the primary transmitters in the predetermined area based on the location information and the RSSI values received thereby using a learning algorithm to thereby reconstruct a power propagation map of the primary transmitters in the predetermined area.