Method and device for detecting main synchronizing signal

Abstract

The invention discloses a method and a device for detecting a main synchronizing signal. The device comprises an FFT converter, a PSS extractor, a variable calculator and a maximum value detector, wherein the variable calculator is used for calculating probability variables representing three known PSS signals at each position of OFDM symbols according to K extraction sequences extracted from frequency domain signals corresponding to the K OFDM signs and the three known PSS signals; and the maximum value detector is used for determining the maximum value in the variables, determines a position corresponding to the maximum value as the position of the main synchronizing signal and determines a PSS signal identifier corresponding to the maximum value as the identifier of the main synchronizing signal. The invention also discloses the method for detecting the main synchronizing signal. The method can realize the detection of the main synchronizing signal in a frequency domain, avoids the complex design of a narrow-band low-pass filter, reduces the calculating amount and improves the frequency offset resistance capacity of a system and the success probability of the cell searching process.

Description

technical field [0001] The present invention relates to LTE technology, in particular to a method and device for detecting a primary synchronization signal. Background technique [0002] In a wireless communication system, one of the important tasks of the terminal in the cell search phase is to obtain the ID of the cell and frame timing information, which are usually carried by a pilot signal in the system. [0003] In the LTE (Long Term Evolution) system, the ID of the cell (hereinafter denoted as: N ID ) by N ID (1) and N ID (2) It consists of two parts, namely: in: [0004] N ID (1) Carried by Secondary Synchronization Signal (SSS, Secondary Synchronization Signal), each N ID (1) corresponds to a specific known sequence. [0005] N ID (2) Carried by the Primary Synchronization Signal (PSS, Primary Synchronization Signal), each N ID (2) corresponds to a specific known sequence. [0006] PSS is a Zadoff-Chu sequence in the frequency domain, generated a...

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Problems solved by technology

[0013] The above-mentioned existing methods for PSS detection often need to design complex narrow-band low-pass filters, and require more calculations

[0014] Moreover, although in theory, the Zadoff-Chu sequence as a PSS is a sequence with very good autocorrelation and cross-correlation characteristics, but in practical applications, the terminal often has a large frequency offset at the beginning of the cell search , this frequency offset will seriously damage the autocorrelation and cross-correlation characteristics of the PSS during the PSS detection process

Therefore, in the presence of large frequency offsets, the detection performance of existing PSS detection methods will deteriorate rapidly

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