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.
CN101197802AInactive Publication Date: 2008-06-11ζŽζ–‡ι©
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ζŽζ–‡ι©
Publication Date
2008-06-11
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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...

Claims

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