A Design Method of FIR Filter and Digital Down Converter

A design method and filter coefficient technology, applied in the field of communication, can solve problems such as occupying computing resources and increasing computing load, and achieve the effects of reducing computing load, occupying less resources, and better performance

Inactive Publication Date: 2021-02-12
胡文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will undoubtedly increase the computing load and occupy more computing resources

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  • A Design Method of FIR Filter and Digital Down Converter
  • A Design Method of FIR Filter and Digital Down Converter
  • A Design Method of FIR Filter and Digital Down Converter

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The invention discloses a digital down converter, the structure of which is as follows figure 1 shown. The digital down-converter is composed of a sampling module, an extraction module, a digital mixing module (DM), a digitally controlled oscillator (NCO) and a FIR filter. Among them, the sampling module samples the intermediate frequency signal at a sampling rate greater than twice the bandwidth of the intermediate frequency signal; the extraction module extracts the sampled signal and divides it into two channels; the two signals extracted in the digital mixing module will be respectively combined with the NCO generated The intermediate frequency sequence is mixed; the mixed two-way sequence will output the in-phase and quadrature two-way baseband signals...

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Abstract

The present invention proposes a kind of design method of FIR filter, at first to I road and Q road respectively determine time delay number; Then according to time delay number to I road and Q road respectively based on Lagrange interpolation design time delay filter coefficient; Finally set The initial value of the filter coefficient is set as the cost function by the weighted sum of the maximum value of the magnitude response of each frequency point k passing through the target passband and the magnitude response of other frequency points other than the main lobe where the target frequency point is located. Then set the number of iterations and iteration rules, search for the optimal solution near the initial value vector, and set two vector sums for each frequency point k passing through the target passband, representing the amplitude response of the frequency point, indicating the main frequency point where the target frequency point is located. The amplitude response of other frequency points outside the lobe and the maximum value of the difference, set the corresponding weight sum and expected threshold, if ω H *var(H)+ω e *max(e)<δ, update the optimal solution with the sum of this time.

Description

technical field [0001] The invention relates to a design method of an FIR filter and a digital down-converter, belonging to the communication field. Background technique [0002] Due to the unparalleled superiority of traditional radio technology, software radio has become a recognized development direction of modern wireless communication technology. An ideal software radio system emphasizes the openness and programmability of the architecture, the flexibility of the hardware circuit, and puts the digital processing (ADC and DAC) as close as possible to the antenna, and changes the configuration, structure and function of the hardware through software updates. At present, the technology of directly sampling radio frequency (RF) has not yet been popularized into products, and the method of digitizing the intermediate frequency with a digital frequency converter is generally adopted. The main idea is: the digital mixer uses a discrete single The frequency local oscillator si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/16H04B1/04
CPCH03D7/165H04B1/04H04B2001/0491
Inventor 胡文陆晓明李春彪李洪涛齐全
Owner 胡文
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