Method and device for time synchronization and frequency synchronization of LTE system

Abstract

The invention provides a method and a device for time synchronization and frequency synchronization of an LTE system. The device comprises a normalized autocorrelation unit which is used for normalized autocorrelation to delay a digital baseband signal for an OFDM period, an automatic fractional frequency offset control unit which is used for estimating a fractional frequency offset according to a peak value generated by the normalized autocorrelation unit, and correcting the fractional frequency offset of the digital baseband signal, a primary synchronization signal correlation unit which isused for normalized correlation of the digital baseband signal after the correction of the fractional frequency offset and a local primary synchronization signal with a preset integer frequency offset, a time synchronization unit which is used for time synchronization according to a normalized correlation value, and an integer frequency offset correction unit which is used for estimating an integer frequency offset according to the normalized correlation value and correcting the integer frequency offset of the digital baseband signal after the correction of the fractional frequency offset, thereby realizing the time synchronization and frequency synchronization of the LTE system.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more specifically, the present invention relates to a method and device for time synchronization and frequency synchronization of an LTE system. Background technique [0002] With the development and progress of society, people require mobile terminals not only to provide high-quality voice and text services, but also to provide high-speed, large-capacity and low-latency digital multimedia application services. In order to meet this growing demand of people, at the end of 2004, the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) started the Long Term Evolution (LTE, Long Term Evolution) project of the universal mobile communication system technology. [0003] The core technology of the LTE standard is OFDM (Orthogonal Frequency Division Multiplexing) technology, which has the advantages of high spectral efficiency, high peak rate, high mobility and l...

AI Technical Summary

Problems solved by technology

When the frequency offset exceeds one subcarrier, the cross-correlation peak disappears, and time and frequency synchronization cannot be achieved; and the range of frequency synchronization is small, only the range of one subcarrier can be estimated, and the accuracy of frequency synchronization is also low

To sum up, in the case of large Doppler and noise interference and integer frequency offset, the existing technology lacks a method that can effectively realize the time and frequency synchronization of the LTE system

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