Based On Sopc Td-scdma Synchronous Clock Design

Characterized by time-division and synchronous code-division, TD-SCDMA is a third-generation mobile communications standard pursued by China.As one of official third generation mobile communication air Interface specifications released by ITU, which adopt smart antenna, synchronous CDMA, and Software Defined Radio technologies. Synchronous technology of TD-SCDMA is one of the key technologies in TD-SCDMA repeater. The paper achieved a TD-SCDMA repeater GPS synchronous clock based on SOPC technology.First of all, from the current TD-SCDMA repeater Overview of synchronous clock compare several TD-SCDMA repeaters'synchronous methods. A brief analyse the actuality and prospect of research of TD-SCDMA repeater's synchronization.Combined with the customer's objective needs of practical applications, give a overall design program of TD-SCDMA repeater's GPS synchronized clock, and briefly introduces the technical elements of the system ,the overall hardware structure and function of each module.Secondly, based on analyse of the TD-SCDMA system frame structure, detailedly describe our design.Combined with 3GPP TS 25.402 and YD / T 1711-2007 technical standards, which issued by Information Industry Ministry, give a specific TD-SCDMA repeater's GPS synchronized system solutions and achieve systems in FPGA hardware platform.Finally, based on Ministry of 2GHz TD-SCDMA digital cellular mobile communication network repeater technical requirements and test method give a specific test method of the synchronization. Due to limited conditions this is only a few key module have been tested, including the PPS adjustment, asynchronous clear and synchronous signals. Given the overall system performance parameters in in the last part of the test, synchronous accuracy is less than 300ns, far less than 3us in the YD / T 1711-2007 Technical specification.