Multi-modulation-format digital baseband generating and modulating device

Abstract

The invention provides a multi-modulation-format digital baseband generating and modulating device which comprises a variable clock output unit, a pseudo-random code generating and mapping unit, a finite impulse response filter unit, an interpolation filter unit, a digital-to-analog conversion unit and an orthogonal modulator unit. The variable clock output unit is used for outputting a high-frequency clock signal to each module to allow the high-frequency clock signal to serve as the working clock signal of each module. The pseudo-random code generating and mapping unit generates pseudo-random data and maps the pseudo-random data into binary data strings. The finite impulse response filter unit is used for performing interpolation on the data strings and performing FIR shaping filter. The interpolation filter unit is used for performing CIC interpolation on generated data. The digital-to-analog conversion unit is used for converting obtained digital signals into analog signals, and a low-pass filter is used to filter the sampling clock signal of the digital-to-analog conversion unit. The orthogonal modulator unit is used for modulating a baseband signal to a carrier. The digital modulation signal generating device with multiple modulation formats, continuous variable modulation rates and a variable filter is designed.

Description

Technical field [0001] The invention relates to a multi-standard digital baseband generating and modulating device. Background technique [0002] Digital baseband generating and modulating devices are widely used in the field of digital measurement in the field of electronic testing, but the existing digital baseband generating and modulating devices mainly have several major defects, so that they are not suitable for the field of electronic testing. First, the digital modulation format is simplified. , Only supports one modulation format or one type of modulation format; then the filter parameters are fixed and cannot be changed; there is also the carrier signal is too narrow to meet the wide band of the signal generator; finally, the index is low, no Meet the index requirements of the test field. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a multi-standard digital baseband generation and modulation device, which ca...

AI Technical Summary

Problems solved by technology

[0002] Digital baseband generation and modulation devices are widely used in the field of digital measurement in the field of electronic testing, but the existing digital baseband generation and modulation devices mainly have several major defects, so that they are not suitable for electronic testing. The first is the simplification of digital modulation formats , only one modulation format or one type of modulation format is supported; then the filter parameters are fixed and cannot be changed; and the carrier signal is too narrow to meet the wide band of the signal generator; finally, the index is low and cannot be changed. Meet the requirements of the test field indicators

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