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Frequency offset estimation and compensation method and device

A technology of frequency offset estimation and pilot channel, which is applied in the field of frequency offset estimation and compensation, can solve the problem of small frequency offset estimation range, and achieve the effect of expanding frequency offset range and good accuracy

Active Publication Date: 2014-06-18
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method and device for frequency offset estimation and compensation to solve the problem that the existing frequency offset estimation range is small

Method used

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  • Frequency offset estimation and compensation method and device
  • Frequency offset estimation and compensation method and device
  • Frequency offset estimation and compensation method and device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 3

[0119] Perform pilot channel estimation on the pilot signals of the two time slots in the above subframe; determine the phase difference of the pilot signals of the two time slots according to the pilot channel estimation result; according to the first frequency offset estimation result fd, CP Determine the value range of the phase difference of the pilot signals of the two time slots; perform the second frequency offset estimation according to the phase difference of the determined value range, and use the second frequency offset estimation result as the final frequency offset estimation result.

[0120] Wherein, the pilot channel estimation is performed on the pilot signals of the two time slots in the above subframe, and the principle of determining the phase difference of the pilot signals of the two time slots according to the pilot channel estimation result is as follows:

[0121] φ = angle ( X n = 0 N SC user - 1 H slot 1 * (...

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Abstract

The invention discloses a frequency offset estimation and compensation method and device. The method comprises the steps that signals are obtained from the timing position of at least one OFDM symbol in a subframe where received signals are located and the predetermined offset position in front of the timing position, and primary frequency offset estimation is carried out by the utilization of the obtained signals, wherein the length of the predetermined offset is not more than the cyclic prefix length of the received signals; pilot channel estimation is carried out on the received signals, secondary frequency offset estimation is carried out according to the pilot channel estimation result, and the result of the primary frequency offset estimation is compensated through the secondary frequency offset estimation. According to the technical scheme, the frequency offset range which can be estimated is widened, the accuracy is better, and the frequency offset estimation and compensation method and device are suitable for highways and high-speed rails.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a method and device for frequency offset estimation and compensation. Background technique [0002] The current operating speed of high-speed railway is 300 kilometers per hour (km / h), and it may develop to 500km / h in the future. High-speed railways have obvious characteristics: high train running speed, long running distance, and complicated geographical environment. In the high-speed railway environment, the existing cellular mobile communication technology will be restricted, the service quality of voice communication will be greatly reduced, and even information islands in the high-speed railway environment will appear. [0003] For Orthogonal Frequency Division Multiplexing (OFDM) technology, Doppler dispersion generated by high-speed movement will destroy the orthogonality between OFDM sub-carriers and cause inter-sub-carrier interference. Inter-subca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L27/2695H04L27/2657H04L27/2682H04L27/2686
Inventor 张亚文刘龙李琼
Owner DATANG MOBILE COMM EQUIP CO LTD