A digital down-conversion method based on quadratic symmetric filtering
A digital down-conversion and symmetrical technology, which is applied in the field of electronic information, can solve the problems of high filter order requirements, long system delay, and high hardware consumption, and achieve the effects of less hardware consumption, reduced processing delay, and reduced development costs
Active Publication Date: 2022-03-01
西安恒盛安信智能技术有限公司
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[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a digital down-conversion method based on secondary symmetric filtering. High, resulting in long system delay, high hardware consumption, high cost, etc.
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[0170] A simulation test has been carried out with regard to the digital down-conversion method based on secondary symmetric filtering of the present invention, and the specific process is as follows:
[0171] 1. Simulation conditions
[0172] In Matlab2008, a chirp signal with a sampling frequency of 100MH and a bandwidth B of 12MHz is generated, and the local chirp signal (n represents an integer from 0 to 1799), see image 3 , (a) is the time-domain diagram of the real part of the local chirp signal, and (b) is the time-domain diagram of the imaginary part of the local chirp signal.
[0173] Move it to the intermediate frequency of 125MHz according to the method of spectrum shifting, and take the real part to obtain the input signal x(n) of step 1, and the analytical formula of x(n) is expressed as:
[0174]
[0175] Here real(.) means to take the real part of the signal, and the spectrum of x(n) can be found in Figure 4 .
[0176] Simulation case 1: ideal state, w...
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The invention discloses a digital down-conversion method based on secondary symmetric filtering, which includes mixing digital signals to obtain in-phase branch signals and quadrature branch signals; Symmetrical filtering, filtering out high-frequency signal components, and obtaining the digital filter signal of the in-phase branch and the digital filter signal of the quadrature branch; extracting the digital filter signal of the same-phase branch and the digital filter signal of the quadrature branch, and obtaining the extraction signal of the in-phase branch and quadrature branch extraction signals; digital symmetrical frequency division filtering is performed on the in-phase branch extraction signals and the quadrature branch extraction signals to obtain the in-phase branch baseband signal and the quadrature branch baseband signal. In the process of converting the signal from digital intermediate frequency to baseband, the processing delay is greatly reduced. At the same time, the number of multiplication operations in the implementation process is greatly reduced, which greatly reduces the hardware development cost, and in the development, the hardware consumption is reduced, which is conducive to system stability. .
Description
technical field [0001] The invention belongs to the technical field of electronic information, and relates to a digital down-conversion method based on secondary symmetric filtering. Background technique [0002] In the field of electronic information, digital signal processing occupies a very important position. The digital signal that undergoes analog-to-digital conversion through the analog front end is usually a digital intermediate frequency signal that has been digitally sampled, and the effective information in it cannot be directly extracted. The digital intermediate frequency signal must be converted into a baseband signal for subsequent information extraction. Therefore, the digital down-conversion technology is completing such work, effectively processing the input signal, and converting it into the required baseband signal after processing. [0003] For the digital down-conversion method, the technical difficulty encountered is that in the process of finite puls...
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IPC IPC(8): H03H17/02
CPCH03H17/02
Inventor 李彦涛杨永锋贾丹
Owner 西安恒盛安信智能技术有限公司