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Implementation method and module for quadrature digital down conversion of IF digital signal

A technology of digital intermediate frequency signal and implementation method, which is applied in the direction of multi-frequency modulation transformation, etc., and can solve the problems of increasing the dynamic power consumption of digital circuits, large quantities, etc.

Inactive Publication Date: 2015-03-04
OLINKSTAR CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of realizing this process in the actual digital circuit, not only a large amount of hardware resources are required to realize the digital filter, but also the dynamic power consumption of the digital circuit is increased.

Method used

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  • Implementation method and module for quadrature digital down conversion of IF digital signal
  • Implementation method and module for quadrature digital down conversion of IF digital signal
  • Implementation method and module for quadrature digital down conversion of IF digital signal

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Embodiment Construction

[0034] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] A kind of realization method of the digital intermediate frequency signal quadrature down-conversion provided in the present invention is as follows:

[0036] First, carry out a quarter down-conversion of the I channel and the Q channel to the input digital intermediate frequency signal. The quarter down conversion means that the frequency of the local carrier involved in frequency mixing is equal to a quarter of the digital sampling rate of the intermediate frequency input signal. One of them; then use a filter to filter one of the I-channel signals and Q-channel signals obtained after down-conversion, and then perform down-sampling extraction after filtering out the high-frequency signals, and the other channel does not use a filter, and only performs digital delay processing , and then perform down-sampling extraction. The down-sampl...

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Abstract

The invention provides implementation method and module for quadrature digital down conversion of an IF digital signal. The method and module are characterized in that the implementation of quadrature digital down conversion of the IF digital signal at any frequency is improved, an I-loop signal or a Q-loop signal is filtered only by a filter, and thus lots of hardware logical resources for the filter can be saved on the premise that the I / Q data are subjected to synchronous down conversion. The method comprises the steps of performing 1 / 4 down conversion for an I loop and a Q loop of the input IF digital signal, wherein the 1 / 4 down conversion is namely that the frequency of local carrier participating in frequency mixing is equal to 1 / 4 digital sampling rate of the IF input signal; one of the I-loop signal and Q-loop signal obtained by down conversion is filtered through the filter, and the downsampling extracting is carried out after a high frequency signal is filtered; another one of the I-loop signal and the Q-loop signal is subjected to digital delay processing without being filtered with the filter, and then the downsampling extracting is also carried out.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and a module for realizing the quadrature down-conversion of a digital intermediate frequency signal. Background technique [0002] In digital communication systems, I / Q quadrature digital down-conversion is often required for digital intermediate frequency signals. Digital filter is an essential component in I / Q quadrature digital down-conversion. In a system that needs to perform I / Q quadrature digital down-conversion, especially in a system that needs to perform I / Q quadrature digital down-conversion on multiple intermediate frequency signals at the same time, the traditional method is to down-convert the I and Q channels of each intermediate frequency signal The Q channel signals are filtered separately. An I-way filter and a Q-way filter will be added for every additional IF input. In the actual digital circuit to realize this process, not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
Inventor 不公告发明人
Owner OLINKSTAR CORP
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