Multi-channel digital down-conversion device

A technology of digital down-conversion and digital down-converter, applied in the field of digital down-conversion, can solve the problems of poor effect, limited functional structure, weak real-time processing capability of the device, etc., to achieve better real-time performance and solve the effect of functional structural limitations

Inactive Publication Date: 2011-02-16
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

like figure 2 As shown, each signal acquisition channel can only be connected to a fixed digital down-conversion channel, and each digital down-conversion channel is independent of each other, and the working mode is relatively single. Due to the comparison of the functional structure of this multi-channel digital down-conversion device Theref

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0029] image 3 It is a structural diagram of the three working modes of the digital down-conversion module.

[0030] Such as image 3 As shown, the digital down-conversion module is composed of n programmable digital down-converters, and each programmable digital down-converter performs quadrature demodulation, digital extraction and low-pass filtering on the digital signal input to the digital down-converter deal with. The digital down-conversion module is connected to the FPGA controller and can work in three different modes under the control of the FPGA controller, i...

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Abstract

The invention discloses a multi-channel digital down-conversion device, which comprises a signal acquisition module, an m*n-way switch matrix, a digital down-conversion module and an FPGA controller. Firstly, the FPGA controller controls the digital down-conversion module and determines the working mode of the digital down-conversion module, such as a narrow-band parallel mode, an orthogonal joint mode and an orthogonal alternative joint mode; secondly, the FPGA controller controls the input/output connection state of the m*n-way switch matrix to further finish the paired connection between an m-channel signal acquisition channel and a digital down-conversion channel so as to carry out demodulation according to different down-conversion working modes; and thirdly, the FPGA controller controls each digital down-converter and writes the index parameters of a numerical control oscillator, the index parameters of a digital extractor and the index parameters of a low-pass filter into corresponding internal registers so that each digital down-converter can be independently programmed. The digital down-conversion device of the invention can realize digital down-conversion processing of various band widths and various index parameters for multiple-channel digital intermediate-frequency signals, ensuring better real-time performance.

Description

technical field [0001] The invention belongs to the technical field of digital down-conversion, and more specifically relates to a device for performing digital down-conversion processing on a plurality of analog intermediate frequency signals. Background technique [0002] After the analog intermediate frequency signal is sampled by an analog-to-digital converter (ADC), the resulting digital intermediate frequency signal must be moved to the baseband. This moving process is the so-called digital down-conversion technology. The digital down-conversion process includes quadrature demodulation, digital decimation and low-pass filtering. [0003] figure 1 It is the specific implementation block diagram of the digital down converter. Such as figure 1 As shown, the digital down-converter is mainly composed of a numerically controlled oscillator NCO, a digital decimator and a low-pass filter. The digital down-converter performs quadrature mixing on the sampling data obtained b...

Claims

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Application Information

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IPC IPC(8): H03D7/16
Inventor 王猛刘涛王志刚李京桓
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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