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Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier

A multi-channel signal, orthogonal frequency division technology, applied in multi-frequency code systems, baseband system components and other directions, can solve the problem of inability to perform signal processing, and achieve the effects of avoiding multiplication operations, easy implementation, and accuracy.

Inactive Publication Date: 2008-06-11
李文革
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Problems solved by technology

[0003] In order to solve the above-mentioned problem that signal processing cannot be performed in the case of large frequency deviation, the purpose of the present invention is to provide a method for estimating and correcting large frequency deviation of OFDM signal carrier with accuracy and easy implementation

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  • Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier
  • Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier
  • Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier

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Embodiment Construction

[0036] Such as Figure 4 As shown, the present invention includes the following steps: dividing the frequency offset estimation into time-domain frequency offset estimation and frequency-domain frequency offset estimation; performing time-domain frequency offset correction according to the estimation results; preferably smoothing the time-domain frequency offset estimation results, That is, a low-pass filter is used to smooth out the peak and valley values ​​of the time-domain frequency offset estimation value, which can not only ensure the stability of signal processing, but also quickly track the frequency offset caused by movement, so as to ensure the parameter tracking of the time-domain frequency offset estimation at the same time Speed ​​and stability; perform Fourier transform after time-domain frequency offset correction; perform frequency-domain frequency offset estimation on the transformed results; use frequency-domain frequency offset estimation results together wit...

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Abstract

The invention relates to a large frequency deviation estimation and correction method for quadrature frequency division multichannel signal carriers, comprising the following steps: time domain frequency deviation estimation of frequency deviation, and time domain frequency deviation correction according to estimation results. The invention also comprises the following steps: smooth processing of the time domain frequency deviation estimation is performed, namely a low pass filter is adopted to smooth down peak values and valley values of time domain frequency deviation estimation values; after the time domain frequency deviation correction, Fourier transformation is performed; frequency domain frequency deviation estimation is performed on transformation results; frequency domain frequency deviation estimation results or time domain frequency deviation estimation results after smooth processing participate in time domain frequency deviation correction once again. The method of the invention overcomes limitation of the prior frequency domain algorithm on frequency deviation estimation and has the advantages of capability of processing large frequency deviation, capability of guaranteeing smooth signal processing, capability of quickly tracking frequency deviation caused by movement, and capacity of being conveniently realized in an integrated circuit design.

Description

technical field [0001] The invention relates to a multi-carrier modulation technique, in particular to a method for estimating and correcting a large frequency deviation of an OFDM signal carrier. Background technique [0002] During the wireless propagation of the signal, the carrier frequency offset will inevitably occur. The carrier frequency offset has a great influence on the correct reception of Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) signals. For this reason, when processing the received OFDM signal, it is necessary to estimate the deviation of the carrier frequency, and correct the carrier frequency of the signal, so as to achieve the purpose of correctly receiving the signal. Traditional algorithms for estimating frequency offset can be estimated in time domain or frequency domain. This algorithm uses the structure of the OFDM signal to estimate the frequency offset, that is, uses the similarity of the two sign...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 徐德清李文革盛泽生
Owner 李文革
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