Method, device and terminal for realizing downlink synchornization

Abstract

The embodiment of the invention relates to a method for realizing downlink synchronization comprises: generating a new local synchronization sequence, carrying out a first stage slide correlation by using the new sequence and the receiving signal; determining crude synchronization point, wherein the new sequence carries part of synchronous channel information; carrying out a second state slide correlation at front or back of crude synchronization point determined by the first stage slide correlation to determine present time synchronization point. The embodiment of the invention relates to a device for realizing downlink synchronization. The method and device of the present embodiment determines precise synchronous time point position by two synchronization, largely shortens synchronization time of access to network, saves large quantity of resource, effectively quickens access speed to network for user.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method, device and terminal for realizing downlink synchronization. Background technique [0002] With the development of mobile communication technology, the 3GPP organization has proposed the next generation mobile communication wireless access technology: LTE (LTE Long Term Evolution, long-term evolution) technology; The base station performs time synchronization; the current common practice is to use the local synchronization sequence of the terminal to correlate with the signal sent by the base station to find the synchronization signal periodically sent by the base station in the downlink signal, so that the terminal can know the start of the downlink transmission wireless frame of the base station position, and perform follow-up processing such as demodulation according to the initial position: according to the current LTE protocol, there will be a s...

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Problems solved by technology

[0003] However, in the synchronization method of the above-mentioned prior art, when correlating each sampling point of the received signal, it is necessary to do L times of complex multiplication (for example, L=128 in LTE) and L times of complex number additions, and LTE half-frame wireless signals share T=9600 sampling points, so when the terminal is synchronized, it is necessary to perform T*L=9600*128=1228800 times of complex multiplication and 1228800 times of complex number addition; if DSP (Digital Signal Processor, digital signal processor) is used to realize These multiplication and addition operations will consume a lot of DSP resources, and the time for synchronous access is also relatively long

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