Researches On Routing Protocol Based On CogMesh Network

With the development of wireless communications, spectrum resources are increasingly strained, while the emergence of Cognitive Radio providing an effective way to resolve this problem----which to increase the usage of spectrum by re-using the allocated frequency bands. CogMesh network, which combined the Cognitive Radio and Wireless Mesh Network, will play a big role in the future.Among the multiple key technologies of CogMesh network, we mainly engaged in the research of Routing Protocols and Spectrum Sensing technologies:Chaos Spectrum sensing:Based on the study of existing technology, we proposed a Multi-band and Adjustable Parameters Spectrum Sensing System which can be used to the wideband signal detection. We can accomplish spectrum detection in Cognitive Radio through this system. Most importantly, we proposed the state determination method which based on the distribution of phase trajectory. And compared with the calculation of Lyapunov exponent and the spectral analysis algorithm, this algorithm is more straightforward and simplicity, which also with the high accuracy and more practical.Routing Cache Algorithm:Firstly, we introduced the structures, characteristics and applications as well as common network Routing Protocols of CogMesh network and Ad hoc network. Then we know it's essential to introduce the routing cache into the Ad Hoc network, as its topology changes frequently. Based on the vertex cut which studied in the graph theory, we proposed a new routing cache management algorithm. This algorithm greatly improves the accuracy of the routing cache and efficiency, and can adapt to the changes of topology better. Finally, we can see this algorithm improves the performance of DSR routing protocol through simulation.