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Frequency offset estimation method and device

A frequency offset estimation and offset estimation technology, applied in the field of communication, can solve the problems of low precision, increase complexity and implementation cost, and achieve the effects of ensuring accuracy, reducing complexity and saving costs.

Active Publication Date: 2014-11-05
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing methods are mainly used when the frequency offset is small, and when the frequency offset is large, the estimation accuracy is relatively low
In the prior art, multiple frequency offset estimation and compensation methods can be used to estimate larger frequency offsets. Although the accuracy of frequency offset estimation can be improved to a certain extent, it also increases complexity and implementation costs.

Method used

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

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Embodiment Construction

[0020] In order to realize the estimation of larger frequency offset, and reduce the implementation complexity and save cost while ensuring the accuracy of frequency offset estimation, the present invention provides a method and device for estimating frequency offset, which can estimate larger frequency offset , while ensuring the accuracy of frequency offset estimation, it reduces implementation complexity and saves cost. The method is as follows: calculating a single pilot frequency offset estimation value based on two pilot sequences contained in the received current subframe, determining an initial frequency offset preset value corresponding to the single pilot frequency offset estimation value, and The two pilot sequences calculate the estimated value of the frequency offset of the dual pilot, and calculate the estimated value of the frequency offset of the current subframe based on the initial value of the frequency offset and the estimated value of the frequency offset o...

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Abstract

The invention discloses a frequency offset estimation method and device, which are used for estimating a larger frequency offset. The frequency offset estimation method comprises the steps of: calculating a single-pilot frequency offset estimation value on the basis of two pilot frequency sequences included in the received current subframe, determining a preset frequency offset initial value corresponding to the single-pilot frequency offset estimation value, calculating dual-pilot frequency offset estimation values on the basis of the two pilot frequency sequences included in the received current subframe, and calculating a frequency offset estimation value of the current subframe on the basis of the frequency offset initial value and the dual-pilot frequency offset estimation values. Therefore, the large frequency offset can be estimated, the realization complexity is reduced while the frequency offset estimation accuracy is ensured, and the cost is saved. The invention also discloses a frequency offset estimation device.

Description

technical field [0001] The present invention relates to the communication field, in particular to a frequency offset estimation method and device. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission technology that requires subcarriers to be orthogonal to each other, which divides a wider transmission bandwidth into multiple orthogonal subcarriers for parallel transmission data. OFDM has the advantages of high spectrum utilization, anti-multipath fading, multiple input multiple output (Multiple Input Multiple Output, MIMO), and simple technology. However, since OFDM requires subcarriers to be orthogonal to each other, it is very sensitive to frequency offset. For example, a frequency synchronization error between a transmitter and a receiver, or a Doppler effect (Doppler) generated by a mobile station during high-speed movement may cause carrier frequency offset (hereinafter referred to as frequency offset). The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 魏继东李萍
Owner ZTE CORP