Method and device of cell search coarse synchronization

Abstract

The invention discloses a method of cell search coarse synchronization and a device of the cell search coarse synchronization. The device comprises a difference preprocessing module and a synchronous position estimation device, wherein the difference preprocessing module comprises a filter and an adding device, the filter processes a received signal r (n) in a delaying way and outputs the processed signal to the adding device, and the adding device processes the received signal r (n) and a delayed receipt signal r (n-M) by means of previous difference, and outputs a preprocessed receipt signal r' (n), to the synchronous position estimation device, wherein r' (n)=r (n)-r (n-M). Therefore, the influence of a direct current component on the cell search coarse synchronization can be greatly reduced, the method and the device can not be limited by the compensation ability of a radio frequency device and the nonideal characteristic of the radio frequency device under a nonsynchronous mode, and the robustness of the cell search coarse synchronization can be greatly improved.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method and device for cell search coarse synchronization in a mobile communication system. Background technique [0002] TD-SCDMA technology (Time Division Synchronous Code Division Multiple Access) is one of the three mainstream standards of the third generation mobile communication technology (3G), and has broad application prospects. In the TD-SCDMA system, user equipment (UE, User Equipment) needs to search for possible cells after initial power-on, and select a suitable cell to log in. Only after the UE logs in to the cell, can it obtain more detailed information of the current cell and the information of neighboring cells, and only after logging in to the cell can it monitor paging or initiate a call. Usually, the process from power-on search to login to a suitable cell is defined as the initial cell search process, ICS (Initial Cell Search) for shor...

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Problems solved by technology

After the DC component exists, the calculation results of the eigenvalues ​​are smaller than those without the DC component, especially in the scene with a large DC component, even if the signal-to-noise ratio is high, it is almost impossible to calculate the effective Eigenvalues ​​make the cell search coarse synchronization method based on the characteristic window invalid

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