| The rapid progress of wireless applications results in the scarcity of radio resources and demands higher efficiency of radio resource management mechanisms. As a big breakthrough in improving the utilization of radio resources, cognitive radio techniques has been one important research topic in wireless networks. However, it needs deepresearch in a variety of areas, among which, routing protocol design in distributed cognitive radio network is a widely-discussed key technique.This thesis carried out a deepresearch in routing algorithms and corresponding protocols under the context of distributed cognitive networks. Through analyzing the characteristics of cognitive radio, the routing algorithms and protocols which adapt them well to the cognitive radio environment are proposed. Besides, their corresponding simulation performances are also illustrated in this thesis.This thesis first introduces the cognitive radio concepts, the research status and standard processing on cognitive radio techniques. The characteristics of cognitive radio and possible issue to confront are analyzed and concluded in follow. To highlight the contribution in this dissertation, the classic protocol in Ad hoc network, AODR, and parts of the cognitive routing protocols are generally also analyzed so as to specify the focus in this thesis.Focusing on spectrum dynamic, interference constraints from cognitive radio users to primary users and un-successive connection and according to different models and sets, the routing algorithms and protocols which adapt them well to the cognitive radio environment are proposed. Chapter 3 proposes spectrum stability model and analyzes routing stability based on the model. Chapter 4 models the primary users's spectrum usage, gives out specific description of computation of route metrics and routing discorvery and so on. In follow, and designs anti-intermittence routing protocol. Besides, a large amount of computerized simulations are shown in other chapters. |
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