A Frequency Offset Adjustment Method Based on SNR Estimation

Abstract

The invention discloses a signal to noise ratio estimation-based frequency offset regulation method, which comprises the following steps of: setting an initial value SNR_reg of a signal to noise ratio register, and the corresponding initial value F_reg of a frequency offset register, and setting a counter n to be equal to 0; setting n to be equal to n+1, and acquiring an estimated frequency offset value Fn of the nth frame of data frames of a single carrier frequency domain equalization (SC-FDE) system; acquiring an estimated signal to noise ratio value SNRn of the nth frame; judging whether the SNRn is greater than the SNR_reg or not, and if the SNRn is greater than the SNR_reg, modifying the F_reg of the frequency offset register to be equal to Fn, and determining the estimated frequency offset value of a current frame to be Fn; if the SNRn is not greater than the SNR_reg, keeping constant the F_reg and modifying the estimated frequency offset value Fn of the current frame to be equal to F_reg; and repeating the steps, regulating the estimated frequency offset values Fn of all the frames. In the method, when a signal to noise ratio is estimated, pilot frequency data used for channel estimation is converted into a frequency domain on the basis of not changing the structure of the data frame for the characteristics of the SC-FDE system, so the accurate estimated signal to noise ratio value can be obtained, and is utilized to adaptively regulate frequency offset to well solve the problem that the estimated frequency offset value has an error under a low signal to noise ratio.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a frequency offset adjustment method based on signal-to-noise ratio estimation. Background technique [0002] At present, with the rapid increase in demand for new communication services, higher requirements are placed on the transmission rate of wireless communication systems and wireless local area networks, and the increase in transmission rate brings increased carrier frequency offset, Intersymbol interference (ISI, intersymbol-interference) and deep frequency selective fading and other issues. Single Carrier Frequency Domain Equalization (SC-FDE, Single Carrier Frequency Domain Equalization) technology can well solve the above problems. [0003] SC-FDE technology needs to insert a cyclic prefix and perform frequency domain equalization. At the same time, this method sends signals in a symbol block structure, which requires high synchronization at the ...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a frequency offset adjustment method based on signal-to-noise ratio estimation to solve the problem of inaccurate frequency offset estimation in the prior art when the signal-to-noise ratio of the received signal is very low

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