A Research On Anti-jamming Key Technology Based On Game Theory In Wireless Communications

With the rapid development of wireless communication, interference suppression is becoming an important factor to improve communication performance, and how to reduce and eliminate interference problems in wireless communications have become a growing concern. Subjectively, interference can be divided into malicious interference and unintentional interference. Unintentional interference means that in the civilian communications user compete for the limited spectrum resources caused interference for other users. In a distributed communication system, users can make their own decisions without having to set up the center console, which simplified the system architecture and reduced the expense of occupied channel. Meanwhile using game theory analysis each rational user behavior, and according to the utility function draw game equilibrium solved simultaneously, which maximize the value of the user’s utility and reduce mutual interference between users. The bottleneck of designing a wireless system in wars is the variability of battlefield environment. Moreover, due to the baleful interference of the enemy, the communication outage probability significantly increases especially in the environment of intercepting, monitoring and warfare. The strategy selection, final performance and price of one’s own communication anti-jamming strategy depend on the dynamic evaluation of the enemy’s interference effect. Jamming is the battle on jamming strategies and anti-jamming strategies of the hostile two sides,and its essence is a kind of game. Game theory is a study of interaction between the decision-making theories. It is not only known each other in action, and take corresponding strategies according to the other side’s decision, but the more important is that it can in the unknown other action information for the decision make process of a presentence analysis, choose the strategy to make their own interests to maximization.Game theory will be used to analyze the jamming effect assessment of interference, and then the optimal jamming strategy combination will be obtained.The paper is made of six parts. The chapter two of this paper introduces the basic concept and definition of game theory, which focuses on the jamming effect assessment of non-cooperative complete game model and how to realize the Nash EquilibriumIn chapter three, with the use of the game theory, the power control problem in the distributed communication system is studied. Firstly, the non-cooperative game is usedto analyze the power control problem of the user under the condition that the user’s capacity and energy efficiency ratio are the utility function separately. The Nash equilibrium accepted is the stable point that maximize the utility value of users, but its performance is not the global optimal and is far away from the upper bound of performance. Then the cost function and repeated game are introduced to improve the non-cooperative game. In order to make the utility value of users has pareto properties,then the power control problem is analyzed by using the cooperative game. the users’ strategy choice are considered separately in the model of Nash bargaining game and K-S bargaining game, and get the corresponding bargaining equilibrium solution. The latter attention to vulnerable users, improve the value of the minimum value of the user’s system performance and reduce the performance gap between users, making the whole system more equitable. Game theory provides a very effective method of resource allocation and code of conduct distributed communications system users.The fourth chapter studies the non-cooperative game against interference effect evaluation of applications. First, an overview of the status of research techniques against interference by the interference and fight against the communication model that describes the problem, assess the effect of non-cooperative interference construct a zero-sum game, and algorithm design, and finally against the policy of interference and utility functions are analyzed, selected BER as a utility function, and gives a different interference against the error rate formula, the opposing sides utility value based on the error rate, obtained Nash equilibrium. On the basis of the above theoretical analysis, the paper present to evaluate the countermeasure effect through the interference game theory analysis to choose strategy and then optimize the anti-jamming and jamming effect. Further, according to the results of equilibrium of the game, such as whether the optimal anti jamming performance can satisfy the communication requirements or not,the decision maker decide whether to continue the communication, as well, since the optimal jamming effect still can’t interfere with the normal communication, considering about the power saving account, the interference side will choose not to interference.This mechanism will be used for the design of jammer and communication anti-jammer respectively.Finally, the simulation system model is established in the tactical wireless communication scenario, and the proposed method and strategy game has carried on the numerical simulation and evaluation. The results show that the optimal strategy of gametheory as guidance, for different jamming technology, communication can choose the optimal strategy and transmission technology.