Research On Wireless Communication Synchronization Technique In The Condition Of Strong Interference

Synchronization technology in and between modern communication system is the key step to transport message correctly. Almost all the communication system need synchronization in the beginning, especially in wireless communication system. The synchronization technology mainly includes two aspects, which is timing synchronization and frequency synchronization. In this thesis the research object is TDMA(Time Division Multiple Access) satellite signal, whose system timing and carrier frequency synchronization algorithm and hardware implementation are discussed. Especially the timing synchronization algorithm for strong interference conditions were studied and discussed in detail. This thesis also implements the intermediate frequency digital receiver and timing synchronization link with FPGA(Field Programmable Gate Array) as the hardware platform. Then it studies the carrier synchronization algorithm based on self synchronization, and completes the FPGA design and simulation.First of all, this thesis introduces the theory of the all digital receiver, the TDMA satellite communication system and its frame structure. At the same time, the thesis introduces the synchronization algorithm for TDMA system, and focuses on the analysis of the timing synchronization algorithm and its anti-interference performance. Then this thesis introduces the frame synchronization loop.Secondly, according to the requirements of TDMA system, this thesis describes the specific design and implementation method of FPGA link of timing synchronization for TDMA system in detail, and makes simulations for some of the modules, then does the final hardware test of time synchronization function. The results show that the function of timing synchronization algorithm is accurate and stable, and has good anti-interference performance in additive channel.Finally, this thesis introduces the influence of carrier frequency offset on the timing synchronization algorithm for TDMA system. Next the thesis expounds the theory of open loop carrier synchronization algorithm and its realization method, then makes simulation. The result shows that the carrier frequency error estimating performance meets expectations.