Radio communication timing synchronization method, cell searching method and system

Abstract

The invention discloses a method for timing and synchronizing wireless communication, a method for searching districts and a system thereof. The method fully utilizes the time domain repetitiveness of a main synchronizing signal in a 5ms period and comprises: firstly, adopting predetermined step length sliding time domain cross-correlation to realize blind timing coarse synchronization with low complexity and without local synchronizing signal reconstruction, simultaneously, using normalized correlation processing to resist strong interference, finally, realizing timing fine synchronization with high precision, and correcting receiver integer multiple residual frequency deviation simultaneously. The method can realize timing and synchronization rapidly and accurately in particular in environment with low signal to interference and noise ratio, thereby realizing district searching in a long term evolution wireless communication system. The method can realize downlink timing and synchronization when the signal quality is in the sensitivity position of a terminal receiver and in the environment with strong interference.

Description

technical field [0001] The present invention relates to wireless mobile communication technology, in particular to a long-term evolution wireless communication system LTE, especially to a timing synchronization method based on a primary synchronization signal in the long-term evolution wireless communication system LTE and a cell search method and system using the method. Background technique [0002] The cell search refers to a process of a user equipment (User Equipment, UE for short) from power-on to searching for a suitable cell. In the Long Term Evolution (LTE for short) system stipulated in 3GPP Release 8, after the user equipment UE is powered on, it needs to search for possible cells, and then select a suitable cell to log in. The user equipment UE only needs to log in to the cell , in order to obtain the information of this cell and adjacent cells, and further monitor the paging on the network or initiate a call to establish a connection. [0003] figure 1 , 2 Sh...

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Problems solved by technology

[0014] (1) The processing complexity is too high

[0015] Taking the latest evolution system as an example, the minimum receiving bandwidth is 1.4MHz to implement signal reception and use its corresponding sampling rate of 1.92MHz to obtain baseband data. The 5ms data processing complexity of the relevant timing synchronization scheme is 9600×128×3=3686400 times of multiplication and addition; obviously, no matter whether the processing capability of the device can bear it, the huge processing complexity will at least bring about the problem of increased power consumption, and the terminal Disadvantage of keeping a long standby time

[0016] (2) When there is strong interference, timing synchronization performance is not good

The existing timing synchronization method is likely to cause the correlation value of the strong interference position to cover the correlation value of the correct position, resulting in timing synchronization failure and false detection of identification within the cell group

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