Synchronous tracking method of LTE system

Abstract

The invention discloses a synchronous tracking method of an LTE system. The synchronous tracking method specifically comprises the following steps: obtaining two time domain symbol sequences rx (p, i, n) with a first type of pilot signals and a second type of pilot signals from each receiving antenna according to different channel bandwidths; performing frequency-domain transformation on the time domain symbol sequences, to obtain a channel frequency domain response of a pilot position; performing channel estimation on the channel frequency domain response of the pilot position to obtain the entire channel frequency domain response, transforming the entire channel frequency domain response into a time-domain response, performing noise reduction processing on the entire channel time-domain response to obtain a noise reduction-processed channel time-domain response, obtaining a time offset and a frequency offset, correcting the time offset and the frequency offset to achieve the synchronous tracking. The synchronous tracking method utilizes different pilot signals to obtain the time offset and the frequency offset under different bandwidth configurations, and to achieve stable synchronous tracking.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a synchronization tracking method of an LTE system. Background technique [0002] LTE (Long Term Evolution, Long Term Evolution Project) is the largest technology research and development project launched by 3GPP (3rd Generation Partnership Project, Third Generation Partnership Project) in recent years. It is a high data rate, low delay and full packet-based mobile One of the core technologies of the communication system is that the downlink transmission scheme adopts OFDM (Orthogonal Frequency Division Multiplexing) technology. The basic idea of ​​OFDM technology is to divide the frequency domain into multiple sub-channels, and each adjacent sub-channel The channels overlap each other, but different sub-channels are orthogonal to each other, and the serial data stream is modulated on multiple orthogonal sub-carriers in parallel, which can reduce the symbol rate of...

AI Technical Summary

Problems solved by technology

Synchronization acquisition is also called initial synchronization, which is generally achieved by sending a pilot sequence. Synchronization tracking refers to maintaining synchronization. Due to the instability of the oscillator and the influence of the Doppler effect, the local carrier of OFDM and the carrier of the received signal will be inconsistent, and there will be frequency drift, which will degrade the performance of the receiver and even fail to receive

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