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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: 2012-12-05
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 an OFDM frequency offset estimation method according to an embodiment of the present invention is: by performing parallel correlation on the baseband data sequence of the receiving end, the lengths are respectively D short And D long The autocorrelation calculation of autocorrelation; detects the small point autocorrelation peak and the large point autocorrelation peak according to the set autocorrelation threshold; calculates the integer multiple frequency offset estimated initial value according to the small point autocorrelation peak, and calculates the decimal according to the large point autocorrelation peak Double frequency offset estimation initial value; the integer multiple frequency offset estimation initial value and the decimal multiple frequency offset estimation initial value are determined by the frequency offset value to determine the final accurate frequency offset detection result.

[0029] Specifically, the method includes the follo...

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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 technology, and in particular to a configurable frequency offset suitable for time-domain frequency offset estimation of 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 broadcasting communication systems due to its excellent anti-multipath capability and high spectrum utilization: for example, wireless local area network standards 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 shortcomings of OFDM technology is that it is more sensitive to frequency offset (also called frequency offset). Frequency offset will destroy the orthogonality between sub-carriers, cause inter-carrier interfer...

Claims

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Application Information

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Patent Type & Authority Patents(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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