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Frequency offset estimation method and device

A technology of frequency offset estimation and channel estimation, applied in the field of communication, can solve the problems of performance affected by noise and accuracy degradation, and achieve the effect of accurate estimation value

Inactive Publication Date: 2011-03-23
LEADCORE TECH
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Problems solved by technology

However, since the channel estimation of LS is greatly affected by noise, the performance of frequency offset estimation is also greatly affected by noise when the signal-to-noise ratio is low, and the estimation accuracy will decrease

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

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Embodiment Construction

[0049] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0050] In the frequency offset estimation method and device of the embodiment of the present invention, the channel estimation in the frequency domain is first performed on the received signal, and then the frequency offset estimation is performed by using the phase difference between the channel estimates on different OFDM symbols.

[0051] In order to describe the embodiment of the present invention more clearly, the OFDM system is briefly described below first.

[0052] In an OFDM system, reference signals (RS) are usually discretely inserted in the time-frequency domain for channel estimation. Taking the LTE (Long Term Evolution, long-term evolution) system as an example, the distribution of the reference si...

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Abstract

The invention relates to the field of communication technology and discloses a frequency offset estimation method and a frequency offset estimation device. The method comprises the following steps of: removing a circulating prefix of a received signal, and transforming the received signal of which the circulating prefix is removed from time domain to frequency domain; acquiring received data at a reference signal position; carrying out LS channel estimation and noise estimation on the received data; according to the noise estimation result and the LS channel estimation result, calculating channel estimation of different orthogonal frequency division multiplexing (OFDM) symbols; carrying out frequency offset estimation by using phase difference among channel estimation of the different OFDM symbols to obtain the frequency offset estimation result of the current subframe. Due to the adoption of the invention, the accuracy of the frequency offset estimation result can be improved.

Description

technical field [0001] The present invention relates to communication technology, in particular to a frequency offset estimation method and device. Background technique [0002] Frequency offset in mobile communication systems is usually caused by the difference between the frequency of the local oscillator and the carrier frequency. If the frequency offset is large, the terminal and the base station cannot be synchronized, and the receiving process cannot be completed. And for OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, since the frequency offset can destroy the orthogonality between subcarriers and introduce interference between subcarriers, the performance of the system will deteriorate. Frequency offset is more sensitive than other systems. Therefore, it is necessary to effectively measure and estimate the frequency offset, and then perform calibration and tracking based on the measured value to ensure that the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 徐兵罗新王乃博陈颖
Owner LEADCORE TECH
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