Research On Key Technologies For Wireless Optical Networks

In recent years, due to the advantages of networking rapidly, flexibility and convenience, Ad hoc networks have been paid extensive attention both in international academia and industry. Simultaneously, Ad hoc networks have become an important development direction of mobile communication technology. However, as Ad hoc networks utilize common wireless transmission technology as underlayer communication means, coupled with some other factors such as collision in competing shared wireless channel, signal attenuation, noise disturbance and interference among channels, the actual bandwidth attained by mobile terminals is much less than maximum theoretical value. Fortunately, the wireless laser communication can solve the above problems owing to its characteristics of high-bandwidth, high data transfer rate, security and confidentiality.The paper first expounds the advantages and disadvantages of Ad hoc networks, including some key technologies such as networking, mobility model, clustering, routing and typical protocols. Secondly, laser technology is introduced, the characteristic and development trend of wireless laser communication network are described briefly as well as the applications in interplanetary, star-earth and free-space. Just because of high-bandwidth, high data rate, security, reliability and other aspects of the tremendous advantages, the applications of FSO has extended from military to commercial and civil fields. Thirdly, key technologies of wireless optical networks such as topology control and routing are depicted. Heuristic routing algorithm is recommended particularly. A MMWO (mobile multimedia communication in wireless optical networks) model is proposed to make up the disadvantages of insufficient link bandwidth, low data transfer rate and poor safety in wireless networks. This model adopts FSO technology and fully considers some special requirements in bandwidth, data transfer rate and throughput for practical application. A quality-of-service (QoS) routing algorithm is provided. Finally, simulation environment and process are detailed. Analysis for simulation results shows that the algorithm has better performance and adapt to requirements for fast and dynamic topology, high-bandwidth and high-rate data transmission in wireless multimedia communication.