Method and device for estimating frequency offset

Abstract

The invention discloses a method and a device for estimating frequency offset. The method comprises steps: the phase estimation value of each time slot in each antenna is calculated respectively, an average phase value is then calculated, and according to the average phase value, a frequency offset estimation value is acquired. The method for calculating the phase estimation value of each time slot in each antenna comprises steps: two groups of data for different timing windows on the same pilot symbol are adopted, time domain CP data for the first M sampling points and the last M sampling points are taken from time domain data, and the extracted time domain CP data are subjected to conjugate correlation to obtain the phase estimation value. Thus, the first and the last time domain CP data are used for frequency offset estimation, and thus, little noise is introduced in the case of estimation, the frequency offset estimation performance is good in a condition with a low signal-to-noise ratio, the problem of a large frequency offset estimation error can be solved, and the estimated range can also meet requirements; and the IFFT point number, the timing advance time, and the sampling point number for extracting time domain CP data are set, and the computation quantity is reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a frequency offset estimation method and device. Background technique [0002] At present, Long Term Evolution (LTE) technology has received extensive attention and research, and has become the key to future high-speed railway communications. According to the development trend of high-speed railway in the future and the current operating conditions in European and American countries, the high-speed railway coverage scheme should be able to meet the speed of more than 300km / h, and the fastest speed can reach 450km / h. Quality requirements are also getting higher and higher. However, the high-speed movement of the railway will cause a large frequency offset. The LTE-based high-speed railway system will be more sensitive to frequency offset due to the adoption of Orthogonal Frequency Division Multiplexing (OFDM) technology. Only fast and effective Only by accuratel...

AI Technical Summary

Problems solved by technology

[0021] Embodiments of the present invention provide a frequency offset estimation method and device to solve the problems in the prior art that the frequency offset estimation range is limited or the frequency offset estimation error is large

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