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Research and Implementation of Method for Clock Synchronization Control in Wireless Communication Testing Systems

Author: Wang
Tutor: ZhangBaoXian; RuZhao
Course: Control Engineering
Keywords: GPS Clock synchronization CPLD OCXO Phasediscrimination
CLC: TN919.34
Type: Master's thesis
Year: 2013
Downloads: 2
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Cellular wireless communication network system and equipment (as represented by TD-SCDMA and TD-LTE) is the key technologies and systems currently under fast construction and development in China. Along with the development of TD industry, core network system and terminal equipment gradually increase, with the application in use and commercial trial. Testing system and supporting equipment are developed and updated constantly as well. Frequencies of cells between neighboring TD base stations should be synchronized within certain precision, otherwise communications could be interrupted when handoff occurs. In addition, high precision clock synchronization is also being gradually used in applications like railway transportation, geological exploration, and smart grid, and etc. During the process of developing and improving the comprehensive testing equipment for TD system, this thesis presents a simple but efficient implementation plan from the viewpoint of the whole network clock synchronization function. In order to achieve clock synchronization, this thesis studies this problem from the following aspects:At the very beginning, this thesis describes the background and demanding source of the clock synchronization problem, and accordingly presents the method of synchronizing the local clock signal through GPS, which combines the advantages of both long-term stability of GPS clock signal and short-term stability of constant temperature OCXO pulse signal, thus provides good synchronous clock signal as an outcome. In the framework of embedded system, this thesis designs a negative feedback control system composed by CPLD, CPU, constant temperature OCXO and D/A converter based on the theory of PLL. By the comparison and adjustments between GPS second pulse signal and local second pulse signal by control system, high precision synchronization will be realized, which means clock synchronization control will be achieved. According to the specific requirements of the implementation of clock synchronization function, this thesis designs the system architecture and control strategy of the GPS clock synchronization device in detail, with the implementation of CPLD phase discrimination function and control method for OCXO through the D/A converter by CPU. Finally, through realization of a test bed for the system functions, this thesis gives reference values for important control parameters.Clock synchronization control system accomplished by this thesis can provide wireless communication signal testing device with a high precision synchronous time reference, thus meet the requirements of TD synchronous clock, and also provide useful design and reference for other applications requiring high precision clock synchronization.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology > Synchronous
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