A method, device and equipment for initial synchronization of a mobile communication system

Abstract

The embodiment of the invention provides initial synchronization method, device and equipment of a mobile communication system. The method comprises the following steps of: calculating relative values by utilizing a received downlink frame signal; setting a characteristic window and computing an accumulation sum of the relative values; calculating local peak average ratios by utilizing the relative value accumulation sum with an absolute value which is greater than a pre-set threshold value T, and a relative value of a middle position of the corresponding characteristic window; selecting the biggest former N local peak average ratios and recording the corresponding relative values; determining each local peak average ratio corresponding to the relative value with the absolute value which is greater than a set threshold value R; and taking the relative value corresponding to the maximum value in the local peak average ratios to finish the initial synchronization. The initial synchronization method, device and equipment of the mobile communication system relate to the technical field of mobile communication and solve the problems that the timing synchronization of the equipment is not accurate and interferences are easily caused, which are caused by that the local peak average ratio of a DwPTS (Downlink Pilot Time Slot) interference signal with small power or the local peak average ratio of a noise signal under a high signal-to-noise ratio environment is greater than the local peak average ratio of a real downlink synchronization signal.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to an initial synchronization method, device and equipment of a mobile communication system. Background technique [0002] Time Division Duplexing (TDD, Time Division Duplexing) type cellular base stations are based on time division work and have high requirements for timing. The timing synchronization is usually based on the listening technology, and its core is to accurately detect the position of a downlink pilot time slot (DwPTS, Downlink Pilot Time Slot). [0003] In the prior art, feature window search or local peak-to-average ratio calculation is commonly used to determine the position of the downlink synchronization code segment (Sync-DL, Synchronous Downlink) in the received frame data, and then determine the position of the DwPTS. [0004] The Sync-DL code segment contains 4 symbols, a total of 64 chips. There are guard time slot (GP, Guard Period) co...

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Problems solved by technology

[0007] The embodiment of the present invention provides an initial synchronization method of a mobile communication system, which is used to solve the problem that the local peak-to-average ratio of the DwPTS interference signal with low power or the local peak-to-average ratio of the noise signal in a high SNR environment is greater than the real downlink synchronization The local peak-to-average ratio of the signal leads to inaccurate timing synchronization of the equipment and the problem of easy interference

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