| 摘要 |
A cognitive radio system is provided comprising a master node and a plurality of mobile terminals. The master node comprises receiving means for receiving, from a plurality of sensor nodes, detection information indicating whether or not the sensor node has sensed a primary user transmission; obtaining means for obtaining, for each sensor node, a measure of a signal to noise ratio, SNR, of secondary user signals received at the sensor node; checking means for checking reliability of the detection information received from the plurality of sensor nodes using the obtained SNR measure for the corresponding sensor node; and decision means for deciding if a primary user is transmitting using a subset of the received detection information that has been determined to be reliable by said checking means. By reliably detecting primary users of a frequency band, secondary users are able to utilize the band when the primary user is not transmitting or receiving. |
