CN102571216A - Compensation measurement apparatus for digital vector signal analysis - Google Patents
Compensation measurement apparatus for digital vector signal analysis Download PDFInfo
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- CN102571216A CN102571216A CN2010105780463A CN201010578046A CN102571216A CN 102571216 A CN102571216 A CN 102571216A CN 2010105780463 A CN2010105780463 A CN 2010105780463A CN 201010578046 A CN201010578046 A CN 201010578046A CN 102571216 A CN102571216 A CN 102571216A
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Abstract
The invention relates to a compensation measurement apparatus for a digital vector signal analysis. The apparatus mainly comprises a digital vector signal analyzer, a modulation meter, and a phase noise measurement device. The digital vector signal analyzer is used to arrange a vector signal analysis demodulation parameter. The input signal of the modulation meter employs a single carrier CW signal. And the input signal of the phase noise measurement device employs a single carrier CW signal; and the phase noise of the signal measures offset carrier frequencies of 10Hz, 100Hz, 1kHz, 10 kHz, 100kHz, and 1MHz as well as the frequency points are recorded in a table. According to the provided compensation measurement apparatus, all technological parameters influencing an error vector amplitude measurement value are measured and thus an actual parameter number value that is estimated theoretically is obtained, thereby effectively improving the consistency level of measurement data for directly measuring the error vector amplitude. And moreover, the apparatus has a great piratical value in the metering technology field and also plays a guiding role in technology development and production; therefore, the provided apparatus has wide application prospects.
Description
Technical field
The present invention relates to the metrological testing technology field, be specifically related to a kind of compensated measurement device of digital vector signal analysis, this device is estimated Error Vector Magnitude through measuring the component that influences Error Vector Magnitude (EVM).
Background technology
In the continuous developing progress of digital communication technology, more and more deep for the analysis of digital vector signal measurement, wherein, be related to measurement result and reliability for the measurement and the uncertainty evaluation of Error Vector Magnitude (EVM).Because the vector analysis instrument that each apparatus manufacturer of the whole world is produced all is a comprehensive high-performance analytical equipment; Has multiple power of test; Also more complicated is formed in its inside; Therefore, also there is certain otherness in the measurement result for this index of Error Vector Magnitude (EVM) of measuring the digital vector signal.For credibility and confidential interval that can rational evaluation Error Vector Magnitude (EVM) result, it is especially crucial that Error Vector Magnitude carries out theoretical calculation.
Summary of the invention
Problem to be solved by this invention is to digital vector signal analysis; Realization is measured the actual value of the Error Vector Magnitude amount of influence; Set up one and overlapped the device that is used for theoretical appraisal digital vector signal analysis measurement data, this device mainly is made up of equipment such as VSA, phase noise measurement device, modulation meters.
Through confirming the numeral expression formula of digital vector; Analyze the related technical parameter of digital vector demodulating error amplitude of the vector (EVM), can know parameters compositions such as spuious and nonlinear distortion in main I/Q imbalance of the parameter that influence the Error Vector Magnitude measured value, parasitic amplitude modulation, phase noise, signal to noise ratio snr, the band, harmonic distortion.
The compensated measurement device that the present invention forms can be measured above-mentioned said each technological parameter that influences the Error Vector Magnitude measured value; Obtain the actual parameter value of theoretical calculation, can improve the consistency of the direct measure error amplitude of the vector of instrument measurement data and write level.
The compensated measurement device that the present invention forms has been realized scientific and reasonable Error Vector Magnitude evaluation, and good effect has been played in the evaluation of the measurement result of all kinds of VSA measure error amplitude of the vectors.In field of measuring techniques, have bigger practical value, and to technology development with produce the effect of the directiveness that plays, be with a wide range of applications.
Description of drawings
Fig. 1 is the compensated measurement device of digital vector signal analysis
Embodiment
In practical application; VSA carries out digital sample after being mixed to intermediate frequency to the RF digital vector signal, resolves into the I road and the Q road signal of two-way quadrature through quadrature demodulator; Again through means such as amplitude and phase compensations; Through a series of data processing and calculating, I road and Q way word base-band information are shown respectively on time domain and frequency domain respectively, also can see its radio spectrum and demodulation parameter and value.Measure the digital vector signal through VSA, confirm each parameter value of demodulation, the technical performance of analyzing, decomposing each demodulation parameter of VSA step by step.Numeral expression formula according to digital modulation signals; Analyze the related technical parameter of vector demodulation Error Vector Magnitude (EVM); Confirm the parameter that influences the Error Vector Magnitude measured value that produced after the vector demodulation, mainly form with parameters such as nonlinear distortion, harmonic distortions by spuious in I/Q imbalance, parasitic amplitude modulation, phase noise, signal to noise ratio snr, the band.
Shown in the compensated measurement device of Fig. 1 digital vector signal analysis, can utilize VSA, phase noise measurement device, modulation meter to measure the digital vector signal respectively, can obtain influencing the parameter of Error Vector Magnitude measured value.Concrete steps are following:
(1) when the digital vector signal is input to VSA, through being set, vector signal analyzes demodulation parameter, as shown in Figure 1:
Fig. 1 vector signal is analyzed demodulation parameter
Can pass through the vector signal demodulation module and measure I/Q imbalance, signal to noise ratio snr, through spuious in the spectrum analysis module measurement band and nonlinear distortion, harmonic distortion etc.;
(2) when the digital vector signal is input to modulation meter, input signal adopts single carrier CW signal, the parasitic amplitude modulation of measuring this signal with modulation meter.Usually should adopt effective value detection mode to obtain the parasitic amplitude modulation actual measured value, represent with percentage (%);
(3) when the digital vector signal is input to the phase noise measurement device, input signal adopts single carrier CW signal, with the phase noise of this signal of phase noise measurement measurement device; Usually phase noise need be measured and depart from carrier frequency 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, these frequencies of 1MHz.
Through the measurement of above-mentioned apparatus, can measure the parameter that influences the Error Vector Magnitude measured value intuitively.
Claims (2)
1. the compensated measurement device of a digital vector signal analysis; This device mainly comprises digital vector signal analyzer, modulation meter, phase noise measurement device composition, and the digital vector signal analyzer is provided with the parameter of vector signal analytic solution frequency modulation section, centre frequency, modulation system, symbol rate, filter type, filter roll-off coefficient; The modulation meter input signal adopts single carrier CW signal, the parasitic amplitude modulation of measuring this signal with modulation meter.Usually should adopt effective value detection mode to obtain the parasitic amplitude modulation actual measured value, represent with percentage (%); Phase noise measurement device input signal adopts single carrier CW signal, departs from carrier frequency 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, 1MHz and with in these frequency record forms with the phase noise measurement of this signal.
2. the compensated measurement device of a kind of digital vector signal analysis according to claim 1; It is characterized in that; Confirm the parameter that influences the Error Vector Magnitude measured value that produced after the vector demodulation, mainly form with parameters such as nonlinear distortion, harmonic distortions by spuious in I/Q imbalance, parasitic amplitude modulation, phase noise, signal to noise ratio snr, the band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105780463A CN102571216A (en) | 2010-12-08 | 2010-12-08 | Compensation measurement apparatus for digital vector signal analysis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105780463A CN102571216A (en) | 2010-12-08 | 2010-12-08 | Compensation measurement apparatus for digital vector signal analysis |
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| CN102571216A true CN102571216A (en) | 2012-07-11 |
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| CN2010105780463A Pending CN102571216A (en) | 2010-12-08 | 2010-12-08 | Compensation measurement apparatus for digital vector signal analysis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846919A (en) * | 2016-03-10 | 2016-08-10 | 中国计量科学研究院 | Modulation degree calibration method and device |
| US20220166565A1 (en) * | 2017-04-28 | 2022-05-26 | Panasonic Intellectual Property Corporation Of America | Measurement apparatus and measurement method |
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2010
- 2010-12-08 CN CN2010105780463A patent/CN102571216A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846919A (en) * | 2016-03-10 | 2016-08-10 | 中国计量科学研究院 | Modulation degree calibration method and device |
| CN105846919B (en) * | 2016-03-10 | 2018-03-27 | 中国计量科学研究院 | A kind of modulation degree calibrating method and device |
| US20220166565A1 (en) * | 2017-04-28 | 2022-05-26 | Panasonic Intellectual Property Corporation Of America | Measurement apparatus and measurement method |
| US11711178B2 (en) * | 2017-04-28 | 2023-07-25 | Panasonic Intellectual Property Corporation Of America | Measurement apparatus and measurement method |
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Application publication date: 20120711 |