Dynamic Spectrum Access (DSA) for multimedia application

With the rapid growth of wireless multimedia applications over the wireless Internet in recent years, the demand for radio spectral resources has increased significantly. In order to meet the quality of service, delay, and large bandwidth requirements, various techniques such as source and channel coding, distributed streaming, multicast have been considered. In this paper, we propose a technique for multimedia transmission over the secondary user network, which uses Dynamic Spectrum Access (DSA). Sensing the radio frequency environment and avoiding busy channel by hopping to vacant channel are the major part in DSA. We address the impact of this technique to multimedia data such as audio signal and image since random hopping and different rate of hopping from one channel to another channel may influence the signal quality. With the help of Software Defined Radio (SDR), we have adopted a flexible and reconfigurable platform for this project. Simulation results are presented based on the received data transmitted through this mechanism.