Digital down-conversion implementation method and storage medium

A technology of digital down-conversion and implementation method, which is applied in the field of signal processing and can solve problems such as the inability to realize full-bandwidth ADC.

Active Publication Date: 2020-10-20
SHENZHEN CITY SIGLENT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is that the existing digital down-conversion technology cannot realize real-time signal processing of full-bandwidth ADC sampling data

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  • Digital down-conversion implementation method and storage medium
  • Digital down-conversion implementation method and storage medium

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Embodiment 1

[0041] Please refer to figure 1 , the present application discloses a method for implementing digital down-conversion, which includes steps S110-S140, which will be described separately below.

[0042] Step S110, acquiring digital sampling data of the signal. For example, digital sampling data can be obtained by means of an analog / digital converter (ADC), which can also be called ADC sampling data.

[0043] In step S120, the digital sampling data is processed into frequency domain data through discrete Fourier transform (DFT for short).

[0044] In step S130, each data point in the frequency domain data is cyclically shifted in the direction of zero frequency according to the preset number of spectrum shift points to obtain shifted data. The number of spectrum shifting points here can be calculated according to the center frequency of the signal and the sampling rate of the digital sampling data, which will be described in detail below.

[0045] Step S140, performing phase ...

Embodiment 2

[0081] This embodiment is based on the technical solution disclosed in the first embodiment, and improves the implementation method of digital down-conversion. The difference is that frequency domain filtering is also performed after the phase correction processing.

[0082] Please refer to Figure 8 , The implementation method of the digital down-conversion claimed in this embodiment includes steps S210-S250, which will be described respectively below.

[0083] In step S210, the DFT processing step is described as: acquiring digital sampling data of the signal, and processing the digital sampling data into frequency domain data through discrete Fourier transform. For the specific processing process, reference may be made to step S110 and step S120 in the first implementation, which will not be repeated here.

[0084] In step S220, the spectrum shifting step is described as: (1) according to the center frequency of the signal and the sampling rate of the digitally sampled d...

Embodiment 3

[0092] This embodiment is based on the technical solution disclosed in Embodiment 1 or Embodiment 2, and improves the implementation method of digital down-conversion. The difference is that after processing the time-domain data, it also includes The process of data extraction processing and frequency offset fine-tuning processing.

[0093] Please refer to Figure 9 , the technical solution of this embodiment includes steps S310-S340, which will be described respectively below.

[0094] Step S310, obtaining time-domain data after IDFT processing. For the specific processing process, reference may be made to steps S110-S150 in the first embodiment, or steps S210-S250 in the second embodiment, which will not be repeated here.

[0095] Step S320, performing extraction processing on the time-domain data according to a preset extraction ratio to obtain extracted data.

[0096] It should be noted that the purpose of performing extraction processing on the time domain data accordi...

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Abstract

The invention relates to a digital down-conversion implementation method and a storage medium. The implementation method comprises the following steps: acquiring digital sampling data of a signal; processing the digital sampling data into frequency domain data through discrete Fourier transform; according to a preset frequency spectrum shift point number, carrying out cyclic shift processing on each data point in the frequency domain data to a zero frequency direction to obtain shift data; performing phase correction on the shifted data according to a preset phase value to obtain corrected data; and performing inverse discrete Fourier transform on the correction data, and obtaining time domain data through processing. A phase correction link is innovatively added in the digital down-conversion process, so that the phase of the time domain data after IDFT processing is kept continuous, and the full-bandwidth real-time measurement requirement of a sampling signal is met; besides, afterphase correction is adopted, the frequency domain processing stage of the signals can combine frequency spectrum shifting and frequency domain filtering together for implementation, so that the resource consumption is greatly reduced, and the processing efficiency of hardware equipment is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for realizing digital down-conversion and a storage medium. Background technique [0002] In the field of wireless communication, signal bandwidth is the main factor affecting the information transmission rate. With the upgrading of technology, the information transmission rate has developed from a few kbps or tens of kbps in the 2G era 20 years ago to the current peak of 20Gbps in the 5G era. Transmission rate, its channel bandwidth can range from tens of MHz to hundreds of MHz. The rapid development of wireless communication technology has put forward higher and higher requirements for the real-time processing capabilities of corresponding test and measurement instruments and equipment. For high-frequency, high-bandwidth signals, real-time monitoring and analysis of the signal's spectrum components is already a very common requirement. [0003] For high-spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
CPCH03D7/16
Inventor 王永添宋民李振军
Owner SHENZHEN CITY SIGLENT TECH
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