Sampling frequency synchronization method and device

Abstract

The invention discloses a sampling frequency synchronization method and a sampling frequency synchronization device, which are used for solving the problem in the prior art that the sampling frequency of a transmitter and a receiver cannot be accurately synchronized. The method comprises that: the receiver determines a first difference value and a first sum value of a first sampling sequence number and a set digital value and a second difference value and a second sum value of a second sampling sequence number and the set digital value according to the first and second given sampling sequence numbers, extracts second sampling results of sampling sequence numbers with a difference value ranged from the first difference value to the second difference value and third sampling results of the sampling sequence numbers with a sum value ranged from the first sum value to the second sum value, and regulates sampling frequency according to magnitude relationship between first and second results obtained by correlating the second and third sampling results and stored prior data respectively. In the embodiment of the invention, the sampling frequency of the receiver is regulated according to correlation results, and correlation between noise interference and the prior data is low, so the sampling frequency of the transmitter and the receiver can be accurately synchronized even at a relatively lower signal to noise ratio (SNR).

Description

technical field [0001] The present invention relates to the technical field of digital signal processing, in particular to a sampling frequency synchronization method and device. Background technique [0002] With the development of communication technology today, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) has been widely applied in various fields. For example, the power line OFDM carrier system, which uses OFDM technology combined with civil low-voltage power line carrier technology, automatically transmits the data of civil watt-hour meters to the power bureau to realize automatic meter reading. figure 1 It is a schematic structural diagram of a power line OFDM carrier system in the prior art, wherein, the transmitting end 101 converts the data of the watt-hour meter into a corresponding digital signal, uses a digital-to-analog converter 1011 to convert the digital signal into a corresponding analog signal, and transmits t...

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a sampling frequency synchronization method and device to solve the problem in the prior art that the sampling frequency of the sending end and the receiving end cannot be accurately synchronized when the SNR is low

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