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Method of processing in-band unevenness caused by DAC preprocessing

A preprocessing and flattening technology, applied in the transmission system, electrical components, etc., can solve the problems of increased difficulty in PCB design and increased power consumption of equipment, and achieve good in-band flatness, reduced signal distortion, and reduced fading effects

Inactive Publication Date: 2019-03-15
SPACE STAR TECH CO LTD
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Problems solved by technology

However, the method of using digital interpolation technology to increase the conversion rate only reduces the influence of Sinc fading to an acceptable level, but does not eliminate this phenomenon from the generation mechanism, and the difficulty of PCB design and equipment power consumption increase

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  • Method of processing in-band unevenness caused by DAC preprocessing
  • Method of processing in-band unevenness caused by DAC preprocessing

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Embodiment Construction

[0025] A zero-order keeper is used in the implementation of the DAC device, which causes inherent fading in its amplitude-frequency characteristics, resulting in poor amplitude consistency in the bandwidth signal, which will affect the performance of the satellite communication system. In narrowband satellite communication systems, the influence of this fading can be ignored, but with the development of multi-carrier broadband satellite communication technology, the inherent fading of DAC devices has become a problem that must be solved in the application of broadband high-order modulation satellite communication systems.

[0026] In order to achieve the above object, the technical solution of the present invention is achieved in that:

[0027] Such as figure 1 , a method for in-band uneven processing caused by preprocessing DAC, using a digital filter to perform pre-distortion processing compensation method to solve the inherent fading problem of DAC devices, so as to achieve...

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Abstract

The invention relates to a method of processing in-band unevenness caused by DAC preprocessing, belonging to the technical field of digital communication. A zero-order retainer is adopted for a digital-to-analog converter (DAC), consequently, inherent attenuation in amplitude-frequency characteristic causes poor amplitude consistency in a bandwidth signal. In the method, a compensation method forpredistortion processing through a digital filter solves the inherent attenuation of the DAC, so that in-band evenness of a broadband signal is improved. Simulation results show that the method effectively relieves in-band unevenness of the broadband signal caused by DAC attenuation.

Description

technical field [0001] The invention relates to a technology for suppressing in-band unevenness in a broadband digital communication system, in particular to a method for in-band unevenness processing caused by a digital filter for pre-distortion processing DAC, and belongs to the technical field of digital communication. Background technique [0002] As an important component of the transmitter system, DAC (Digital-to-Analog Converters) devices are widely used in the fields of mobile communications and satellite communications. Since the DAC device uses a zero-order keeper in its implementation, its amplitude-frequency characteristics inherently have attenuation, resulting in poor amplitude consistency in the bandwidth signal, which will affect the performance of the satellite communication system. In narrowband satellite communication systems, the influence of this fading can be ignored, but with the development of multi-carrier broadband satellite communication technology...

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Application Information

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IPC IPC(8): H04B1/04
CPCH04B1/04H04B2001/0425
Inventor 谷林海杨育华王元刘江春
Owner SPACE STAR TECH CO LTD
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