A method and device for generating an AM wave baseband signal
A technology of baseband signal and generation method, applied in the direction of amplitude modulation carrier system, etc., can solve the problems of low signal amplitude accuracy and low frequency offset accuracy, achieve short adaptation time, improved stability, and overcome the inaccuracy of amplitude modulation depth. high effect
Active Publication Date: 2016-12-07
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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[0004] The technical problem to be solved by the present invention is to provide a method and device for generating an AM wave baseband signal, so as to solve the problems of low accuracy of amplitude modulation baseband signal amplitude and low accuracy of frequency offset in radio signal modulation technology
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[0026] The present invention will be further described below according to the accompanying drawings.
[0027] The present invention provides a device for generating high-frequency baseband signals with high-precision frequency offset. The device includes a digital carrier signal source 1, a modulation signal generator 2, a digital quadrature mixer 3, and a level control module 4 , a digital-to-analog converter 5, an analog quadrature mixer 6 and a radio frequency signal source 7. The output terminals of the output terminals of the digital carrier signal source 1 and the modulation signal generator 2 are respectively connected with the first input terminal and the second input terminal of the digital quadrature mixer 3, and the digital quadrature mixer 3 Level control module 4 and digital-to-analog converter 5 are connected successively between analog quadrature mixer 6, and described quadrature mixer is also connected with radio frequency signal source 7, and the excitation si...
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The invention relates to a method for generating an amplitude-modulated wave baseband signal. The method comprises: using a digital carrier signal source to generate a first subcarrier signal and a second subcarrier signal which are orthogonal with each other; frequency mixing a first modulating signal with the first subcarrier signal to obtain a first amplitude-modulated wave baseband signal and frequency mixing a second modulating signal with the second subcarrier signal to obtain a second amplitude-modulated wave baseband signal; converting the first amplitude-modulated wave baseband signal and the second amplitude-modulated wave baseband signal into analog signals; using an analog quadrature frequency mixer to divide a radio frequency carrier signal into a first radio frequency carrier signal subjected to multiplying and adding operation with the analog first amplitude-modulated wave baseband signal and a second radio frequency carrier signal subjected to multiplying and adding operation with the analog second amplitude-modulated wave baseband signal so as to obtain the amplitude-modulated wave baseband signal with increased frequency. The technical scheme of the invention may overcome a problem of not high enough accuracy of amplitude modulation depth of conventional microwave frequency band amplitude modulation, achieves an amplitude modulation depth value error better than + / -0.1%, and increases the stability of amplitude modulation.
Description
technical field [0001] The invention relates to a method for generating a baseband signal, in particular to a method and device for generating an AM wave baseband signal. Background technique [0002] At present, radio signal modulation technology has been widely used in various communication systems, among which amplitude modulation (also known as standard amplitude modulation) is an important aspect of radio signal modulation technology. In the field of radio metrology calibration, amplitude modulation has long suffered from accuracy issues. The parameter to measure the accuracy of amplitude modulation is the ratio of the amplitude of the modulating signal to the amplitude of the carrier signal. Therefore, if you want to measure the depth of AM, you must first measure the two parameters of the amplitude of the modulating signal and the amplitude of the carrier signal. According to the uncertainty evaluation theory of measurement results, the measurement uncertainty of AM ...
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IPC IPC(8): H04L27/04
Inventor 吴远伍武卫平李文意任士卿韩蕊程春悦陈晋龙
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT