Study Of Pseudo-code Synchronization And Frequency Offset Estimation Algorithm In High Dynamic Environment

Owing to its high security and strong anti-interference,spread spectrum communication is widely applied in both military communications and mobile communications.With the continuous progress of our traffic ways,the communication systems begin to face the challenge of the high dynamic environment.In high dynamic environment,some factors between transmitter and receiver are forcing the receiver to bear the large Doppler frequency,such as relative velocity and acceleration,which brings about difficulty in receiving.In this case,the critical backstop to high-speed communication is the successful dispreading by receiver of high dynamic environment.The growing demand for high-speed communication brings attention to high dynamic receiver.As the heart of high dynamic receiver,high dynamic synchronization can divide to two parts:acquisition and tracking.The paper mainly studies how to achieve syschronization of high dynamic environment.The main content includes six parts.1)The receiving technology of modern communication system,pseudo-random sequence,the acquisition and tracking technology of direct spread spectrum system(DSSS).2)Have done some research on the synchronization difficulty of high dynamic algorithm and analysis of different synchronization algorithms.3)Bring out a proposed acquisition algorithm of this paper,and analyze the simulation result of the proposed algorithm.4)Design a high dynamic syschronization scheme,and make a detailed analysis of each syschronization module.5)Finish the FPGA implementation of the upper scheme and explains the process of the implementation ways.6)Test the implementation results,and compare with the original algorithm.The technical difficulty of this paper is the acquisition and frequency estimation to spread spectrum signals of the high dynamic environment.The paper has deep going analysis and research of the high dynamic acquisition algorithm.A two-dimensional acquisition algorithm of joint pseudo-code acquisition and frequency estimation has been applied in the receiver.This algorithm not only meets the successful acquisition and frequency estimation of the high dynamic signals,but also improves the system's performance significantly and saves acquisition time and hardware resources.