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Method and device for determining frequency offset

A frequency offset and determination method technology, applied in multi-frequency code system, digital transmission system, electrical components, etc., can solve the problem of high processing complexity

Active Publication Date: 2020-10-30
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The processing complexity of the above method is relatively high, requiring multiple Fast Fourier Transform (FFT) operations and Inverse Fast Fourier Transform (IFFT) operations

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  • Method and device for determining frequency offset
  • Method and device for determining frequency offset
  • Method and device for determining frequency offset

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Embodiment Construction

[0059] The embodiment of the present application proposes a method for estimating frequency offset based on a frequency-domain pilot signal, which can reduce complexity compared with performing frequency offset estimation based on a time-domain pilot signal. The embodiments of the present application may be applicable to the LTE-V system or its evolution system, or other communication systems.

[0060] In the embodiment of the present application, the phase offset of the detected pilot sequence in different subcarriers can be estimated and phase compensated in the frequency domain first, and then the compensated frequency domain pilot sequence and the preset frequency domain The pilot sequence (also referred to as the local pilot sequence) performs a correlation operation, and calculates the frequency offset based on the characteristics of the correlation operation result.

[0061] The signal sending end can map the pilot sequence to the frequency domain (for example, on the s...

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Abstract

A frequency offset determination method and apparatus are disclosed. In the present application, the received time-domain signal is converted into a frequency-domain signal, and a frequency-domain pilot sequence is detected from the frequency-domain signal. a phase offset of the frequency domain pilot sequence in the frequency domain is determined, and the phase of the frequency domain pilot sequence is compensated according to the phase offset; The frequency offset is determined according to the correlation between the compensated frequency domain pilot sequence and the preset frequency domain pilot sequence. With the present application, frequency offset estimation can be performed based on a frequency domain pilot sequence, thereby reducing the implementation complexity.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for determining a frequency offset. Background technique [0002] Since the carrier frequency of the fifth-generation long-term evolution (LTE-V, where LTE is the English abbreviation for long term evolution) system is relatively high, it can reach 5.9GHz, and the relative moving speed can reach 240km / h. At the same time, the crystal oscillator stability of ±0.1ppm is considered , the total receiving frequency offset can reach 2.48KHz, and frequency offset estimation needs to be performed based on a single column pilot. [0003] In the prior art, a transform domain frequency offset estimation method is provided. In the transform domain frequency offset estimation method, multiple transformations between the time domain and the frequency domain are required for frequency offset estimation, which mainly includes the following process: tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04B2201/70701H04L27/0014H04L27/2657H04L27/2675H04L2027/0026H04L2027/0065
Inventor 周海军苗玉梅李媛媛
Owner DATANG MOBILE COMM EQUIP CO LTD