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Method and device for estimating frequency offset

A frequency offset estimation and squaring technology, which is applied in the field of communication and can solve the problems of inaccurate estimation of frequency offset, large time interval, and phase inversion.

Inactive Publication Date: 2015-05-13
SANECHIPS TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The traditional frequency offset estimation scheme is based on pilots, and the time interval between pilots is often relatively large, and a large time interval may cause phase inversion, so that the frequency offset cannot be accurately estimated, that is, the frequency offset estimation Inaccurate, especially when estimating some large frequency offsets

Method used

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  • Method and device for estimating frequency offset
  • Method and device for estimating frequency offset

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Embodiment Construction

[0014] Embodiments of the present invention provide a frequency offset estimation method and device, which are used to improve the accuracy of frequency offset estimation in an LTE FDD downlink system.

[0015] The embodiment of the present invention combines the characteristics of the frame structure of the LTE FDD downlink system, and considering that the interval between the primary synchronization signal and the secondary synchronization signal is less than 0.1 ms, a scheme for frequency offset estimation based on the synchronization signal is proposed, so that the frequency offset can be accurately estimated large frequency deviation. Furthermore, according to the OFDM system equation, the influence of Intercarrier Interference (ICI, Intercarrier Interference) in the system is considered, and the influence of ICI is eliminated.

[0016] see figure 1 , a frequency offset estimation method provided by an embodiment of the present invention, comprising the steps of:

[001...

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Abstract

The invention discloses a method and a device for estimating frequency offset, which are used for improving the accuracy of estimation of frequency offset in a Long Term Evolution Frequency Division Duplex (LTE FDD) downlink system. The method for estimating frequency offset comprises the following steps of: reconstructing a received second synchronous signal by using signal channel impulse response of a first synchronous signal, so as to obtain a reconstructed signal of the second synchronous signal; demodulating the received second synchronous signal, comparing a second synchronous signal after demodulation with the reconstructed signal of the second synchronous signal, and determining frequency offset estimation value according to the result of comparison.

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] In the Long Term Evolution (LTE, Long Term Evolution) Frequency Division Duplexing (FDD, Frequency Division Duplexing) downlink system, an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is used. In the communication system, when the crystal oscillators of the mobile terminal and the base station are not aligned, the downlink OFDM signal will be affected by a fixed frequency offset, or when the terminal operates at a relatively high speed, the Doppler effect will also be introduced into the system frequency offset. When the frequency offset is large, it will cause mutual interference between subcarriers, thus affecting the demodulation performance and system throughput of the receiver. [0003] Frequency offset estimation techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 曹国强萧少宁
Owner SANECHIPS TECH CO LTD
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