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Decision method for estimating frequency deviation of OFDM

A frequency offset estimation and frequency offset technology, applied in the field of communication, can solve the problems of symbol fine synchronization, integer multiple frequency offset, etc. Accurate and interacting contradictions, the effect of reducing the overhead of hardware operations and delay times

Active Publication Date: 2010-01-06
浙江科睿微电子技术有限公司
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Problems solved by technology

[0014] The present invention is proposed aiming at solving the problem of integer multiple frequency offset or symbol fine synchronization in the related art. Therefore, the main purpose of the present invention is to provide a judgment method for frequency offset estimation of OFDM to solve the above-mentioned problems. at least one of the questions

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  • Decision method for estimating frequency deviation of OFDM
  • Decision method for estimating frequency deviation of OFDM
  • Decision method for estimating frequency deviation of OFDM

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Embodiment

[0028] The main principle of a judgment method for OFDM frequency offset estimation according to an embodiment of the present invention is as follows: by performing parallel correlation on the baseband data sequence at the receiving end, the lengths are respectively D short and D long Autocorrelation operation; detect small-point autocorrelation peaks and large-point autocorrelation peaks according to the set autocorrelation threshold threshold; calculate integer multiple frequency offset estimation rough values ​​based on small-point autocorrelation peaks, and calculate decimals based on large-point autocorrelation peaks The estimated rough value of the multiple frequency offset; the estimated rough value of the integer multiple frequency offset and the estimated rough value of the fractional multiple frequency offset are obtained through the frequency offset value determiner to obtain the final accurate frequency offset detection result.

[0029] Specifically, the method inc...

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Abstract

The invention provides a decision method for estimating the frequency deviation of OFDM, which belongs to the technical field of communication and comprises the following steps: setting the correlation length of a short autocorrelator and the correlation length of a long autocorrelator according to the range change of system frequency deviation parameters; operating and working out the peak value of the short autocorrelator and the peak value of the long autocorrelator according to the correlation length of the short autocorrelator and the correlation length of the long autocorrelator; estimating a wide-range frequency deviation estimation gross value according to the peak value of the short autocorrelator; estimating a narrow-range frequency deviation estimation gross value according to the peak value of the long autocorrelator; determining the architecture type and the frequency deviation subsection range of a frequency deviation value determining device; and determining the result of frequency deviation according to the architecture type and the frequency deviation subsection range of the frequency deviation value determining device, the wide-range frequency deviation estimation gross value and the narrow-range frequency deviation estimation gross value. The decision method reduces the operation complexity of a frequency synchronization algorithm.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a configurable frequency offset acquisition method suitable for time-domain frequency offset estimation in a broadband data packet burst transmission Orthogonal Frequency Division Multiplexing (OFDM) system. value judgment estimation method. Background technique [0002] OFDM technology has been widely used in current broadband wireless communication systems and digital broadcast communication systems because of its excellent anti-multipath ability and high spectrum utilization: such as wireless local area network standard WiFi (802.11a / g / n), WiMax (802.16d / e), LTE downlink, digital broadcasting system DVB, CMMB, etc. all adopt OFDM technology. However, one of the main disadvantages of OFDM technology is that it is sensitive to frequency offset (also called frequency offset). Frequency offset will destroy the orthogonality between sub-carriers, cause inter-carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 吴斌朱勇旭周玉梅
Owner 浙江科睿微电子技术有限公司
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