| With the rapid development of wireless communication technology in recent years, the problem of spectrum’s shortage is also increasingly apparent. The emergence of cognitive radio technology has proposed a new solution to this problem. Due to the radio’s spectrum distribution network environment gets more dynamically, the traditional routing algorithms can not fit the new radio network. So finding a route algorithm which can meet the new network environment will become the core of the cognitive radio network. This paper is based on the cognitive radio hoc Ad network environment and do a research on the routing algorithm based on channel capacity estimation.At first, this article will do a simple introduction for the basic concept of cognitive radio and cognitive radio networks. It summarizes the existing radio network networking on the basis of cognitive radio network and analyzes their own characteristics and the adaptation of the network environment. It introduces the main routing protocols of cognitive radio network and Ad hoc networks. It leads to the concept of Ad hoc networks on the basis of the main routing protocols. The problems and shortcomings of the traditional Ad hoc distributed network in the new environment are analyzed and the new features about Ad hoc networks is describes.Secondly, a routing metric based on channel capacity is proposed and the number of channels and hops is considered in the metric of routing about cognitive radio network environment. The ON-OFF model was used to model the behavior of the main users using spectral resources. We propose a new routing algorithm on the basis of existing DSR routing protocols and routing metrics research. This algorithm combines the channel capacity, the route hops and the channel number. It makes the cognitive users use the spectrum resources effectively without interference to the licensed user conditions. At the same time, it can quickly complete the appropriate end to end connection and meet the needs of communication.Finally, the proposed routing protocol of this paper will make simulation. The simulation results show that the routing protocol which is compared with the traditional DSR routing protocol proposed in this paper has a greater advantage in the form of an end-to-end link complete routing duration, channel capacity, route transmission delay and total channel number. |
