Self-adaptive auxiliary synchronization signal detection method for TD-LTE (time division-long term evolution) system

Abstract

The invention requests to protect a self-adaptive auxiliary synchronization signal detection method for a TD-LTE (time division-long term evolution) system, relating to the technical field of mobile communication and aiming at solving the problems in the aspects of low auxiliary synchronization signal detection accuracy and the like in the existing TD-LTE system. The method comprises the following steps: obtaining a timing fine synchronization position according to cross-correlation peak values of baseband signals received by a receiving end and master synchronization signals generated locally; leading the baseband signals of the receiving end to pass through a low-pass filter, remaining data on 62 subcarriers close to direct-current subcarriers, and obtaining a frequency-domain channel impulse response by the master synchronization signals; estimating the current channel environment according to the duration of the frequency-domain channel impulse response, adopting a self-adaptive feedback method to carry out modification on the frequency-domain channel impulse response; and according to the estimated value of the modified frequency-domain channel, adopting a coherent detection method to detect auxiliary synchronization signals.

Description

technical field [0001] The invention relates to the technical field of mobile communication, and relates to a method for detecting a secondary synchronization signal in a third-generation mobile communication long-term evolution system (TD-LTE). Background technique [0002] 3GPP (3 rd Generation Partnership Project) organization launched the long-term evolution (Long Term Evolution, LTE) work of the air interface technology in March 2005. LTE is the mainstream new generation mobile communication standard in the world after the third generation mobile communication. TD-LTE is the An LTE system in Time Division Duplex (TDD) mode, the LTE system is based on Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (Multiple Input Multiple Output, MIMO) technologies. [0003] When a user terminal (User Equipment, UE) wants to access an LTE cell, it must first perform a cell search process, that is, a detection process for a downlink synchronization ...

AI Technical Summary

Problems solved by technology

However, in the actual channel environment, although the receiving end has performed coarse time synchronization estimation and carrier frequency offset correction before detecting the PSS, the time synchronization position estimated by the receiving end is not accurate enough, there is residual frequency offset or the current signal-to-noise Factors such as relatively low make the frequency-domain channel impulse response estimated by PSS not ideal, and when the method of coherent detection is adopted, the SSS index number ( ) detection error, resulting in an error in the cell group identification number, resulting in cell search failure

In summary, the existing TD-LTE system lacks an effective and highly accurate secondary synchronization signal detection method

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