Primary synchronization signal detection method in LTE system

Abstract

The primary synchronization signal detection method in an LTE system. The method comprises the following steps: converting cross-correlation process to linear convolution, converting the linear convolution into circular convolution in a zero filling mode, and performing Fourier transform FFT operation to obtain a primary synchronization signal PSS sequence dmf(n) in a local frequency domain; performing the Fourier transform FFT operation on a received signal sequence, and performing point-to-point multiplication on the received signal sequence and the local primary synchronization signal PSS sequence to obtain a cross-correlation power sequence, judging whether the primary synchronization signal PSS is successfully retrieved by judging the peak to average ratio of the cross-correlation power sequence, and if so, calculating a PSS signal position according to the peak position, and calculating a call intra-group identifier; and otherwise, indicating that the retrieval is failed. The primary synchronization signal detection method has the beneficial effects of reducing the complexity of the cross-correlation operation while keeping the wide adaptability of the cross-correlation operation in PSS synchronization, improving the operation accuracy while reducing the single-step operation data size and improving the operation efficiency and accuracy.

Description

technical field [0001] The invention relates to the technical field of communication testing, in particular to a method for detecting a primary synchronization signal in an LTE system. Background technique [0002] LTE (Long Term Evolution, long-term evolution) is a long-term evolution of the UMTS technical standard formulated by the 3GPP organization. It was officially established and launched at the 3GPP Toronto TSG RAN#26 meeting in December 2004. In the LTE system, the user equipment UE needs to initialize synchronization and establish a connection with the base station, and must perform cell search synchronization first. This is a relatively complicated process, which needs to complete time synchronization, frequency offset estimation and frequency offset compensation, acquisition of cell ID information, acquisition of broadcast information, and determination of CP type. The first step in cell search and synchronization is the detection timing of the primary synchroniz...

AI Technical Summary

Problems solved by technology

[0011] The main idea of ​​the PSS detection algorithm based on autocorrelation is to use the correlation of PSS itself to directly correlate the received signal without using the local PSS to complete timing synchronization. The biggest advantage is that it has low computational complexity and is easy to use. Frequency offset estimation, the disadvantage is that it requires a long estimation time, and the detection timing performance is poor in the case of low signal-to-noise ratio

[0012] The main idea of ​​the PSS detection algorithm based on cross-correlation is to use the known transmitted signal and received signal to perform sliding cross-correlation. By judging the position of the peak output of the cross-correlation function, PSS timing synchronization can be obtained. The main advantage is that it can be used for any PSS structure. The disadvantage It is computationally intensive and complex

[0013] From this analysis, the existing PSS detection algorithm can not give consideration to both complexity and applicability, and there is still an urgent need for an improved PSS detection scheme in the art

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