In-band Spectrum Sensing without Quiet Period for OFDM System in Cognitive Radio

The usual in-band spectrum sensing in cognitive radio is performed without the interference from the network itself by quiet periods. In this paper, an In-band spectrum sensing method is proposed which can avoid the usage of quiet period to guarantee the performance of the network. In this method, the complementarity of adjacent OFDM symbols is utilized to perform energy detection. Furthermore, the performance of the algorithm is analyzed and this idea is extended to several applications. Simulation proves that the algorithm has a comparable performance with power detector with quiet period. And the algorithm can achieve an acceptable detection performance for IEEE802.22 system.