Abstract:Wireless Multimedia Sensor Networks (WMSNs) can real-time monitor, collect and process multimedia information. They have wide applications. Compared to other traditional sensor networks, WMSNs need more bandwidth to transmit multimedia information. However, the limited radio frequency spectrum appears more and more precious as the wireless communication devices are gaining momentum. Dynamic spectrum allocation can extend the spectrum used by wireless multimedia sensor networks and eliminate the interferences. In this paper, a novel method for spectrum sensing and management is proposed. So that WMSNs which are limited by energy and computation ability can sense spectrum environment via periodical rotation and communicate by available spare spectrum. Finally, the validity of proposed methods are proved by the experiment.