| Summary: | 碩士 === 國立臺北科技大學 === 電子工程系 === 106 === Since the car moving in high speed causes high Doppler shift in vehicle communication, the wireless communication environment will be changed in driving environments. In order to ensure the driving safety, a vehicle communication system has a specific regulation on the time latency. The IEEE 802.11p, the standard for vehicle communication, enacts the system latency should be shorter than 100 ms.
Based on the IEEE 802.11p frame structure, a vehicle communication scenario with high Doppler shift is simulated. In this thesis, we proposed two methods to reduce the complexity of frame synchronization for the traditional Minimum Mean Square Error (MMSE) algorithm. First, the signal sampling method is used to reduce the system operating time. The second method is the threshold detection method, which is used to improve the time latency for frame synchronization. Simulation results show that the proposed methods can improve time complexity greater than 44% for other traditional algorithms. Both methods can greatly improve the frame synchronization time and further reduce the system time latency.
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