Phototropism Based Distributed Cooperation Spectrum Sense in Cognitive Radio

The most obvious characteristic of Cognitive Radio is spectrum cognition. Spectrum sense is the primary question of spectrum cognition. Distributed cooperation spectrum sense is the most important way for improving the efficiency of spectrum utilization and avoiding interference to licensed user. It is one of the key techniques which need be resolved imminently in Cognitive Radio. In this paper, phototropism in biology is introduced for distributed cooperation spectrum sense in Cognitive Radio. Phototropism based distributed cooperation sense technology is researched. The features of "light source" in spectrum sense are analyzed. Comparing the commonness and difference between plant growth and spectrum sense, the distributed model is modeled for phototropism based cooperation sense. Based on wireless auto-organized network technology and data fuse method, the application schemes at distributed cooperation nodes are designed. Through analyzing the bionic arithmetic and network topologic structure of cooperation nodes, we research the phototropism based distributed cooperation sense method with fast speed and wide band in order to sense spectrum optimally. The results of researching in this paper give a novel technical scheme for distributed cooperation sensing and are valuable in theory and engineering in Cognitive Radio.