Research On Orthogonal Frequency Hopping Sequence Generation And Multiple Access Synchronization Technology

With the vigorous development and application of 5G networks,the use of satellite communication networks and terrestrial communication networks to form a satellite-ground fusion networking system has become a hot research topic today.However,for the satellite-to-ground networking system,on the one hand,it is easy to be interfered,or even intercepted and deceived by a third party.On the other hand,with the increase in the number of ground users,it is urgent to improve the networking capacity of the system.Under this background,this paper firstly studies and designs an orthogonal multiple access frequency hopping synchronization system model for satellite communication,focusing on expounding and researching two key issues that need to be solved in the system model:high-performance cognitive orthogonal frequency hopping Generation of sequence families and multiple access frequency hopping synchronization techniques.Then,through the hardware platform implementation,an orthogonal frequency hopping communication system that simulates the satellite-ground link is built for testing and verification.The main contents of this paper include:1.The general design of the orthogonal frequency hopping communication system model is being researched.Model the downlink work flow in the satellite frequency hopping communication system and assess the major issues that must be resolved.The architecture of the orthogonal frequency hopping communication system is next discussed,as well as the functions and specific design methodologies that it can perform.2.Study the construction of orthogonal frequency hopping sequence family.To begin,the orthogonal frequency hopping sequence family’s unique generation algorithm is described in depth,as are the algorithm steps.Then,using the MATLAB simulation tool,examine the generation algorithm for uniformity and determine whether it has good overall performance to match the requirements of the orthogonal frequency hopping communication system.3.Research orthogonal multiple access frequency hopping synchronization technology.According to the system model,a frequency hopping synchronization scheme that satisfies multi-user networking is designed,and the scheme flow and specific design method are introduced.Finally,using the MATLAB simulation tool,the synchronization performance of the scheme is examined in both the theoretical and noisy situations.4.Orthogonal frequency hopping communication system hardware design and implementation.Firstly,an orthogonal frequency hopping communication system is built by simulating the satellite-ground downlink,and the hardware generation and realization of the orthogonal frequency hopping sequence and the hardware realization of the satellite-ground orthogonal multiple access frequency hopping synchronization structure are completed.Then use the waveform detection tool in the hardware description software to simulate and test the system modularly;then use the FPGA development board to complete the board-level debugging of the system.Finally,the joint debugging test is carried out to verify the system sending data,receiving and displaying the bit error rate,and testing the sequence cognitive performance of the system in the noise environment.