Synchronization signal detection method and terminal

Abstract

The present invention relates to a synchronization signal detection method and a terminal, wherein the method comprises: The terminal carries out FFT transform on the data frame received from a base station to obtain frequency domain data; Frequency domain correlation operation is carried out on the frequency domain data and a preset frequency domain PSCH sequence to obtain a correlation sequence; A maximum value of the correlation sequence is determined; The start time position of the PSCH signal in the data frame received by the terminal is determined by the position of the maximum value in the correlation sequence so as to obtain the synchronization signal detection result, wherein the preset frequency domain PSCH sequence can be obtained by carrying out the FFT transformation on the locally stored time domain PSCH sequence which has undergone compensation processing of preset frequency offset. In the invention, the correlation operation is transferred from time domain to frequency domain, and when the preset frequency offset is under processing, frequency offset correction is transferred to the locally stored PSCH sequence for undergoing processing, and the PSCH sequence after frequency offset compensation processing and received signal are utilized to carry out the frequency domain correlation operation, thereby reducing the times of frequency offset compensation processing, improving the synchronization signal detection implementation efficiency and reducing cost of the system.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a downlink synchronization signal detection method and a terminal. Background technique [0002] In a wireless communication system, the initial task of a wireless communication device is to identify and acquire signals transmitted from cells, and another main task is to search for cells to determine which cell is most suitable to establish communication with. Synchronization signals are provided for initial signal acquisition and cell search. For example, in an LTE (Long Term Evolution, Long Term Evolution) communication system, a Primary Synchronization Channel (PSCH) is designed to assist mobile terminals in cell search. LTE defines three possible PSCH sequences. For each cell, a fixed PSCH sequence is used to send periodically at a fixed time and frequency. As an important step in cell search, the terminal needs to detect the PSCH time location and the specific...

AI Technical Summary

Problems solved by technology

[0006] 1. The complexity of the correlation operation is proportional to the length of the PSCH sequence, and the computational complexity is high; considering multi-antenna reception and various preset frequency offsets, the total amount of calculation required is relatively large;

[0007] 2. The frequency offset pre-compensation of the received signal needs to store multiple signals, which increases the storage requirement;

[0009] 4. Since the frequency offset compensation is usually implemented by the Cordic algorithm, additional hardware units are required; if the sine and cosine values ​​are directly calculated and the frequency offset is compensated, the calculation of the sine and cosine values ​​is more complicated and requires a higher amount of calculation

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