Design Of Synchronization And Multiple Access For Broadband Anti-jamming Ad Hoc Network

Ad Hoc network is a wireless communication network with no center, self-organization, multi hop routing characteristics. It can adapt to the dynamic changes of topology, without the information of infrastructure, which has been widely used in military and civilian fields. Because of its strong anti-jamming and anti-interception ability and high spectrum utilization ratio, frequency hopping communication technology has become an important anti-jamming technology. The combination of frequency hopping communication technology and Ad Hoc network engenders a kind of anti-jamming Ad Hoc network, which not only can enhance the system's anti-jamming ability, but also can adapt to the fast changing complex battlefield environment.Ad Hoc network has the characteristics of multi hop sharing channel, conflict and collision in communications. Though the traditional method such as IEEE 802.11 DCF can solve the part of the problem, but it does not consider the influence of the frequency hopping communication technology in the system. So this paper presents a design scheme for broadband anti-jamming Ad Hoc network based on dual-channel. Firstly, the general scheme of the system is given, including the choice of the modulation and demodulation method, the network topology and its working principle. Then the key problems of the system, synchronization and multiple access, are discussed in this paper.The proposed synchronization scheme is a combination of Beidou timing and TOD method. We give not only the synchronous performance analysis, but also the calculation method of the system parameters according to the system requirements and index. The calculation of the parameters and the simulation analysis of the system anti-jamming performance verifies that the scheme we proposed can meet the anti-interference performance requirements.The proposed multiple access scheme is realized by a control channel and a data channel. According to the characteristics of the frequency hopping communication technology, the same frequency hopping key is assigned to all control transceivers, which made them synchronization and enter the same network, control network. The control transceivers will use the same frequency hopping pattern in control channel to transmit information. The sub network key is transmitted through the control channel which made the data sub network established and also data transmitted. The scheme takes both the frequency hopping communication technology and dual-channel characteristics into account. The performance of the system is analyzed and simulated by MATLAB. With the comparison of the single channel IEEE 802.11 DCF, the proposed scheme has a much lower end-to-end delay characteristic and satisfies the system requirements.