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Coefficient fitting method of FARROW filter

A filter and low-pass filter technology, applied in the field of coefficient fitting of FARROW filter, can solve the problems of affecting fitting accuracy, high polynomial degree, and easy oscillation

Active Publication Date: 2020-01-17
GUANGXI NORMAL UNIV
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Problems solved by technology

The defect of this polynomial piecewise fitting is that when the number of fitting points is large, the degree of polynomial is high, which is prone to oscillation, which affects the fitting accuracy.

Method used

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  • Coefficient fitting method of FARROW filter

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Embodiment Construction

[0020] The problem of sampling rate conversion can be summarized as a resampling process. First, the sampling signal x(nT x ) reconstructed as an analog signal: where T x is the sampling period, at t=mT y Resampling y(t) to get: The process of signal interpolation is the process of sampling rate conversion. The common interpolation method is integer multiple interpolation, that is, inserting I-1 zero values ​​between two original sampling points, and I is the interpolation factor; however, the actual The symbol timing is independent of the sampling clock, so the sampling factor is not an integer multiple. Impulse Response of Ideal Interpolation Filter Since the interpolation filter is non-causal, it can only approach its ideal characteristics infinitely. In order to improve calculation efficiency and save hardware resources, the present invention adopts a polyphase filter structure to realize a coefficient fitting of a FARROW filter.

[0021] The concrete steps of embo...

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Abstract

The invention discloses a coefficient fitting method of a FARROW filter based on wavelet function fitting. According to the method, the method comprises the following steps: firstly carrying out the multi-phase decomposition of a low-pass filter, and obtaining a multi-phase filter coefficient matrix; secondly, conducting wavelet fitting on each column of coefficients of the coefficient matrix, andobtaining wavelet fitting coefficients through calculation by means of a least square method; and finally, loading a coefficient obtained by fitting into a FARROW filter structure, and outputting a resampling output value at an expected position by an input signal through the structure. According to the method, the oscillation phenomenon occurring during filter coefficient fitting can be reduced,and compared with traditional polynomial fitting, under the condition of the same fitting order, the fitting precision can be effectively improved by changing the scale factor, and the calculation efficiency of the general demodulator is improved.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a coefficient fitting method of a FARROW filter. Background technique [0002] A universal demodulator that adapts to different modulation and code rates meets the needs of future communication technology development, and sampling rate conversion is one of the key technologies to realize a universal demodulator. For signals with different modulation and code rates, the symbol rate also changes. In order to improve the accuracy of timing error estimation and carrier frequency offset estimation, the equivalent sampling rate of the input signal is usually required to be an integer multiple of the symbol rate. Such an estimate must be preceded by processing the equivalent sampling rate of the signal. [0003] In order to improve the calculation efficiency of the system and reduce the consumption of resources, the sampling rate conversion of the general demodulator ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/028Y02E40/40
Inventor 李非肖琨
Owner GUANGXI NORMAL UNIV
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