Method and apparatus for estimating integer frequency bias

An integer frequency offset estimation and integer frequency offset technology, applied in the field of communication, can solve problems such as indistinguishable, integer frequency offset estimation error, OFDM communication system cannot work normally, etc., to achieve the effect of improving accuracy and reducing impact

Inactive Publication Date: 2009-08-19
HUAWEI TECH CO LTD
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Problems solved by technology

The integer frequency offset will cause the position of the subcarrier where the frequency domain data is located to shift. The size of the shift is equal to the size of the integer frequency offset. Therefore, the integer frequency offset must be accurately estimated and corrected, otherwise the OFDM communication system will not work properly.
[0003] In the process of implementing the present invention, the inventor found that in the prior art, the integer frequency offset estimation would be affected by the timing synchronization, because the actual timing synchronization position It is not always possible to be exactly at the ideal position t 0 , the synchronization position offset will cause th

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  • Method and apparatus for estimating integer frequency bias
  • Method and apparatus for estimating integer frequency bias
  • Method and apparatus for estimating integer frequency bias

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Embodiment 1

[0018] An embodiment of the present invention provides a method for estimating an integer frequency offset, which will be described in detail below with reference to the accompanying drawings.

[0019] figure 2 For the method flowchart of this embodiment, please refer to figure 2 , the integer frequency offset estimation method of this embodiment mainly includes:

[0020] 201: Perform fast Fourier transform on multiple time domain positions including timing synchronization positions of the received signal to obtain multiple sets of frequency domain data;

[0021] Wherein, the method of this embodiment can be applied to the case of a single receiving antenna, and can also be applied to the case of multiple receiving antennas.

[0022] Among them, the ideal timing synchronization position t 0 It can be realized by timing synchronization of the received signal, for example, first estimate the starting position of the FFT window of the fast Fourier transform, and when the sta...

Embodiment 2

[0032] An embodiment of the present invention also provides a method for estimating an integer frequency offset, which will be described in detail below with reference to the accompanying drawings.

[0033] figure 2 For the method flowchart of this embodiment, please refer to figure 2 , the integer frequency offset estimation method of this embodiment mainly includes:

[0034] 201: Perform fast Fourier transform on multiple time domain positions including timing synchronization positions of the received signal to obtain multiple sets of frequency domain data;

[0035] According to this embodiment, the timing synchronization position obtained after timing synchronization After, to avoid timing synchronization position Deviating from the ideal timing synchronization position t 0 ,allowable Multiple nearby time-domain positions P are taken for FFT, for example, the time-domain position can be t ^ - D , ...

Embodiment 3

[0055] An embodiment of the present invention also provides an integer frequency offset estimation device, which will be described in detail below with reference to the accompanying drawings.

[0056] Image 6 For the device composition block diagram of this embodiment, please refer to Image 6 , the integer frequency offset estimation device 60 of this embodiment mainly includes:

[0057] A fast Fourier transform unit 61, configured to perform fast Fourier transform on multiple time domain positions including timing synchronization positions of the received signal, to obtain multiple sets of frequency domain data;

[0058] The correlation unit 62 is used to correlate the multiple sets of frequency domain data obtained through the transformation of the fast Fourier transform unit 61 with the local pilot sequence within the integer frequency offset search range to obtain multiple sets of correlation values;

[0059] The peak search unit 63 is configured to perform peak search...

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Abstract

The invention discloses a method and a device for estimating integer frequency offset; the method comprises the steps: fast Fourier transformation is carried out to a plurality of time-domain positions which receive signals and comprise timing synchronization positions so as to obtain multiple groups of frequency domain data; the frequency domain data are correlated with local pilot sequences respectively in the searching range of the integer frequency offset so as to obtain multiple groups of correlation values; peak search is carried out to the multiple groups of correlation values; and the integer frequency offset corresponding to the highest value among the correlation values is taken as the integer frequency offset estimation. With the adoption of the method and the device in the embodiment, a frequency domain correlation is carried out in a plurality of positions around the timing synchronization position, and the integer frequency offset corresponding to the highest value among the correlation values is taken as the integer frequency offset estimation, thereby increasing the accuracy of the integer frequency offset estimation and reducing the influence on the integer frequency offset estimation by unsatisfied timing synchronization.

Description

technical field [0001] The present invention relates to the communication field, in particular to an integer frequency offset estimation method and device. Background technique [0002] At present, the Zadoff-Chu sequence is more and more widely used in various OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) communication systems due to its good correlation characteristics, such as the LTE (3GPP Long Term Evolution, 3GPP Long Term Evolution Project) system Zadof-Chu is used as a synchronization signal in . In this type of mobile communication system, there is a problem that the user equipment UE (User Equipment) and the crystal oscillator of the base station cannot locate the same frequency accurately, so there is a frequency offset in the communication system, and the frequency offset will seriously affect the communication. system performance. Frequency offset in OFDM systems usually refers to normalized frequency offset, whi...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 林亚吴向春
Owner HUAWEI TECH CO LTD
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