Research On Strategy Of Spectrum Management In Navy Battlefield

Wireless communication is an important technique for communication in navy battlefield. Spectrum is the core of wireless communication, and it is a scarce, valuable and limited resource, which needs to be fit the demand of radio communication. With the development of radio communication, the management of spectrum is the bottleneck of improving the performance of radio communication technique. Thus, the spectrum management strategy received tremendous attention from both civil and military areas, because of its promise of a wide range of potential application and important significance of researches.The strategy of spectrum management includes the frequency assignment and the maximum usage of spectrum. In navy battlefield, the devives of communication have intelligent antennas, and the network need to be a multi-radio and multi-hop networks, in order to increase the range of communication networks and guarantee the security of information in navy battlefield. Thus, the traditional strategy of spectrum management can not be used without any change. Meanwhile, there were not any way to solve the spectrum save problem in invalid transmition, and inprovme the usage of spectrum.Then we propose novel algorithms, strategies and solutions to improve the performance of spectrum usage. And, based on simulations, the performance and effectiveness of these strategies are verified.The comtributions of this thesis include:(1) We analyzed the effectiveness of intelligent antennas, changed the coputational model of co-channel and ad-channel interference, added the operator of antenna gain, improved the coputational model of carrier interference ratio. Further, we considerd the requirements of communication in navy battlefield, and proposes two optimization problems for different objects of frequency assignment problem in navy battlefield. At last, we proposed frequency assignment algorithm based on ants for these two optimization problem. The simulations verified its effectiveness.(2) In order to fit constantly changing of electromagnetic environment, we propose the dynamic strategy of spectrum assignment. In order to minimize the interference, with the help of dynamic programming theory, we ranked nodes with traffic loaded by nodes, the number of communication devices and the number of hop from AP node at first. And then, we assigned frequencies according to the rank of node. Further, we propose the dynamic strategy of spectrum assignment to cope with the changing of electromagnetic environment. From results of simulations, it can be seen that the algorithm and strategy improved performance of multi-radio and multi-hop networks in naval battlefield.(3) Due to invalid transmission, spectrum were wasted. We proposed two solutions to solve hidden-terminal problem and broadcasting retransmission problem respectively. We used the solution based on physical network coding to solve the hidden-terminal problem at first. Further, we proposed the solution based on symbol level network coding to achieve broadcasting retransmission. Based on results of simulations, the effectiveness of these solutions were verified to save the spectrum.The entire works of this dissertation are exploring forefront in strategy of spectrum management in navy battlefield. Proposals and results are expected to optimize the design of wireless network protocols and improve the network performance in navy battlefield.