CN108988962A - A kind of correcting device and method of wideband vector modulated signal Error Vector Magnitude - Google Patents
A kind of correcting device and method of wideband vector modulated signal Error Vector Magnitude Download PDFInfo
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Abstract
The present invention discloses a kind of for the modified apparatus and method of wideband vector modulated signal Error Vector Magnitude.The device includes: computer, arbitrary waveform generator, upconverter, real-time oscilloscope and reference clock.Method of the invention carries out multiple wideband vector modulated signal Error Vector Magnitude amendment by computer, the Error Vector Magnitude of wideband vector modulated signal is reduced, provides the wideband vector modulated signal of high quality for fields such as broadband digital communication, Vector Signal Analyzer and vector signal generator calibrations.
Description
Technical field
The present invention relates to the communications fields.Wideband vector modulated signal Error Vector Magnitude is used for more particularly, to one kind
Modified apparatus and method.
Background technique
The rapid development of the communication technology proposes new challenge, broadband to the transmission rate, bandwidth and transmission capacity of signal
Vector modulation signal is more and more paid attention to because having the characteristics that noise resisting ability is strong, bandwidth efficiency is high.Error vector width
Degree is the grouping error that actual signal vector obtains compared with reference signal vector, and wherein reference signal vector is exactly actual signal
Ideal signal vector representated by constellation point on the corresponding standard planisphere of vector.Error Vector Magnitude is evaluation wideband vector
Modulated signal quality and the most common evaluation parameter of communication system performance.Currently, wideband vector modulated signal usually using will in
The mode that frequency signal upconverts to radio frequency obtains, the wideband vector modulated signal poor quality directly obtained in this way, corresponding mistake
Difference vector amplitude is very big, is unable to satisfy the increasingly extensive application demand of wideband vector modulated signal.
Accordingly, it is desirable to provide a kind of be used for the modified apparatus and method of wideband vector modulated signal Error Vector Magnitude, it is
The wideband vector that the fields such as broadband digital communication, Vector Signal Analyzer and the calibration of vector signal generator provide high quality is modulated
Signal.
Summary of the invention
The present invention provides a kind of modified apparatus and method of wideband vector modulated signal Error Vector Magnitude, reduces width
Error Vector Magnitude with vector modulation signal is broadband digital communication, Vector Signal Analyzer and vector signal generator school
The wideband vector modulated signal of the fields such as standard offer high quality.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
One aspect of the present invention provides a kind of modified device of wideband vector modulated signal Error Vector Magnitude, the device packet
It includes: computer, arbitrary waveform generator, upconverter, real-time oscilloscope and reference clock；
The computer is used to emulate the wave file for generating ideal modulated intermediate frequency signal and control real-time oscilloscope acquisition
Wideband vector modulated signal, and to carry out predistortion amendment to the wideband vector modulated signal；
The arbitrary waveform generator is used to convert IF Modulation for the wave file of the ideal modulated intermediate frequency signal
Signal；And it exports square-wave signal and provides trigger signal for real-time oscilloscope；
The upconverter is used to up-convert to the modulated intermediate frequency signal wideband vector modulated signal of radio frequency；
The real-time oscilloscope is for acquiring the wideband vector modulated signal and measuring；
The reference clock is used to provide for the arbitrary waveform generator, upconverter and real-time oscilloscope with reference to letter
Number.
Preferably, device further include: the first power splitter and the second power splitter；
The reference signal that reference clock exports is divided into two-way by first power splitter, be separately input to the second power splitter and
Arbitrary waveform generator；
The reference signal that first power splitter inputs is divided into two-way by second power splitter, be separately input to upconverter and
Real-time oscilloscope.
Preferably, the reference signal is 10MHz reference signal.
Preferably, the reference clock is rubidium clock.
Preferably, the ideal modulated intermediate frequency signal is modulated intermediate frequency signal of the Error Vector Magnitude less than 0.1%.
Another aspect of the invention, which also provides a kind of above-mentioned apparatus and carries out wideband vector modulated signal Error Vector Magnitude, repairs
Positive method, comprising the following steps:
Computer Simulation generates the wave file of ideal modulated intermediate frequency signal and is uploaded in arbitrary waveform generator；
The wave file of the ideal modulated intermediate frequency signal is converted modulated intermediate frequency signal by arbitrary waveform generator, and passes
It transports to upconverter and carries out up-conversion, export the wideband vector modulated signal of radio frequency；
Real-time oscilloscope is acquired measurement to the wideband vector modulated signal under control of the computer；
The wideband vector modulated signal Digital Down Convert measured is carried out Fourier transformation to intermediate frequency, and to it by computer,
It obtains measuring signal intermediate frequency frequency spectrum Ym(ω)；
The ideal intermediate-freuqncy signal for uploading to arbitrary waveform generator is subjected to Fourier transformation, obtains the intermediate frequency of ideal signal
Frequency spectrum Xi(ω)；
To the estimation H of system linear and faint non-linear distortiond(ω)=Ym(ω)/Yi(ω)；
Predistortion amendment is carried out to the distortion estimated, adjustment uploads to the signal of arbitrary waveform generator；On after adjustment
The frequency spectrum X of communication number1(ω)=Yi(ω)/Hd(ω)；
To X1(ω) carries out inverse Fourier transform, the up-delivering signal after being adjusted, and is uploaded to arbitrary waveform generator；
Up-delivering signal adjusted is converted modulated intermediate frequency signal by arbitrary waveform generator, repeats above step, completes
Primary amendment.
Preferably, repeat repeatedly to correct, until the Error Vector Magnitude of wideband vector modulated signal is in certain time
Floating range is maintained in certain threshold value in section；At this point, obtaining required high quality broadband vector modulation signal.
Preferably, when the arbitrary waveform generator, upconverter and real-time oscilloscope work, reference clock mentions for it
For 10MHz reference signal.
Preferably, the wave file of the ideal modulated intermediate frequency signal is converted middle frequency modulation by the arbitrary waveform generator
While signal processed, rectangular wave is exported as real-time oscilloscope, trigger signal is provided.
Beneficial effects of the present invention are as follows:
This method reduces broadband arrow for the modified apparatus and method of wideband vector modulated signal Error Vector Magnitude
The Error Vector Magnitude of modulated signal is measured, is broadband digital communication, Vector Signal Analyzer and the calibration of vector signal generator etc.
The wideband vector modulated signal of field offer high quality.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 show the preferred embodiment of the present invention for the modified device of wideband vector modulated signal Error Vector Magnitude
Schematic diagram.
Fig. 2 shows the planispheres of ideal modulated intermediate frequency signal used in the present invention.
Fig. 3 shows the planisphere of the wideband vector modulated signal directly measured.
Fig. 4 shows the preferred embodiment of the present invention after 5 predistortion amendment steps, the wideband vector modulated signal measured
Planisphere.
Description of symbols: 1- computer, 2- arbitrary waveform generator, 3- upconverter, 4- real-time oscilloscope, 5- reference
Clock, 6- power splitter A, 7- power splitter B.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
It is filled as shown in Figure 1, this preferred embodiment provides a kind of correct for wideband vector modulated signal Error Vector Magnitude
It sets, comprising: computer 1, arbitrary waveform generator 2, upconverter 3, real-time oscilloscope 4, reference clock 5, power splitter A6 (first
Power splitter), power splitter B7 (the second power splitter).
Wherein, computer 1 for emulating the wave file for generating ideal modulated intermediate frequency signal, and uploads to random waveform
Generator 2, and wideband vector modulated signal waveform is acquired for controlling real-time oscilloscope 4, line width of going forward side by side band Vector Modulation is believed
The amendment of number predistortion.Specifically used 1Gbaud character rate in this preferred embodiment, 2GHz real-time bandwidth, 4GHz carrier frequency
64QAM signal.
Ideal signal planisphere is shown in Fig. 2, Error Vector Magnitude 0.06%；Ideal constellation is to pass through Computer Simulation
Gained is not that reality is achievable, converts real output signal and upper change for ideal waveform in arbitrary waveform generator
During intermediate-freuqncy signal is upconverted to radio frequency by frequency device, signal quality can sharply deteriorate, as shown in Figure 3.
The wave file of arbitrary waveform generator 2, the ideal modulated intermediate frequency signal for uploading computer 1 is converted into reality
Border modulated intermediate frequency signal, and it is input to the IF input terminal of upconverter 3, and output Marker signal is real-time oscilloscope 4
Trigger signal is provided；
Upconverter 3, the intermediate-freuqncy signal for exporting arbitrary waveform generator 2 up-convert to the wideband vector tune of radio frequency
Signal processed, and it is input to the channel one of real-time oscilloscope 4.In the preferred embodiment radiofrequency signal character rate be 1Gbaud,
Real-time bandwidth is 2GHz, carrier frequency 40GHz.
The wideband vector modulated signal of real-time oscilloscope 4, the radio frequency for exporting to upconverter 3 is acquired measurement.
The bandwidth of real-time oscilloscope 4 used is 63GHz in the preferred embodiment.
Reference clock 5 provides 10MHz reference signal for arbitrary waveform generator 2, upconverter 3, real-time oscilloscope 4.?
Reference clock is small-sized rubidium clock in this preferred embodiment, and base short-term stability is better than 10 at that time-11。
Power splitter A6, the reference signal for exporting reference clock 5 are divided into two-way, are separately input to power splitter B7 and appoint
The 10MHz reference input of meaning waveform generator 2.
Power splitter B7, the reference signal for inputting power splitter A6 are divided into two-way, are separately input to upconverter 3 and reality
When oscillograph 4 10MHz reference input.
Another aspect of the invention, which also provides a kind of above-mentioned apparatus and carries out wideband vector modulated signal Error Vector Magnitude, repairs
Positive method, comprising the following steps:
Computer Simulation generates the wave file of ideal modulated intermediate frequency signal and is uploaded in arbitrary waveform generator；
The wave file of the ideal modulated intermediate frequency signal is converted modulated intermediate frequency signal by arbitrary waveform generator, and passes
It transports to upconverter and carries out up-conversion, export the wideband vector modulated signal of radio frequency；
Real-time oscilloscope is acquired measurement to the wideband vector modulated signal under control of the computer；
The wideband vector modulated signal Digital Down Convert measured is carried out Fourier transformation to intermediate frequency, and to it by computer,
It obtains measuring signal intermediate frequency frequency spectrum Ym(ω)；
The ideal intermediate-freuqncy signal for uploading to arbitrary waveform generator is subjected to Fourier transformation, obtains the intermediate frequency of ideal signal
Frequency spectrum Xi(ω)；
To the estimation H of system linear and faint non-linear distortiond(ω)=Ym(ω)/Yi(ω)；
Predistortion amendment is carried out to the distortion estimated, adjustment uploads to the signal of arbitrary waveform generator；On after adjustment
The frequency spectrum X of communication number1(ω)=Yi(ω)/Hd(ω)；
To X1(ω) carries out inverse Fourier transform, the up-delivering signal after being adjusted, and is uploaded to arbitrary waveform generator；
Up-delivering signal adjusted is converted modulated intermediate frequency signal by arbitrary waveform generator, repeats above step, completes
Primary amendment.
In order to obtain the Broad-band Modulated Signal of low Error Vector Magnitude, such predistortion amendment may need to carry out more
It is secondary.Preferably, repeat repeatedly to correct, until the Error Vector Magnitude of wideband vector modulated signal floats within a certain period of time
Dynamic range is maintained in certain threshold value；Stop amendment when i.e. Error Vector Magnitude no longer has clear improvement；At this point, obtaining required
High quality broadband vector modulation signal.
Specifically, the device of this preferred embodiment is used for the modified method of wideband vector modulated signal Error Vector Magnitude,
Specific steps are as follows:
A) emulation of computer 1 generates the wave file of ideal modulated intermediate frequency signal, uploads in arbitrary waveform generator 2.
B) signal output end of arbitrary waveform generator 2 exports modulated intermediate frequency signal, until the intermediate frequency of upconverter 3 inputs
End.
C) the Marker output end of arbitrary waveform generator 2 exports square-wave signal to 4 channel two of real-time oscilloscope, is channel
The measurement of one waveform provides trigger signal.
D) IF input signals up-conversion to radio frequency band is input to 4 channel one of real-time oscilloscope by upconverter 3.
E) reference clock 5 provides high-precision 10MHz reference signal, is input in power splitter A6.
F) 10MHz reference signal is divided into two-way by power splitter A6, is input to arbitrary waveform generator 210MHz reference all the way
Input terminal provides reference signal for it, and another way is input in power splitter B7.
G) received reference signal is divided into two-way by power splitter B7, is separately input to upconverter 3 and real-time oscilloscope 4
10MHz reference input, provides reference signal.
H) computer 1 controls real-time oscilloscope 4 and is acquired to waveform in channel one, resulting wideband vector modulated signal
Planisphere is as shown in Figure 3, it can be seen that, signal quality is excessively poor, Error Vector Magnitude 13.6%.
I) using computer 1 by the wideband vector modulated signal Digital Down Convert measured to intermediate frequency.
J) signal for obtaining down coversion carries out Fourier transformation, obtains measuring signal intermediate frequency frequency spectrum Ym(ω)。
K) the ideal intermediate-freuqncy signal for uploading to arbitrary waveform generator 2 is subjected to Fourier transformation, obtains ideal signal
Intermediate frequency spectrum Xi(ω)。
L) to the estimation H of system linear and faint non-linear distortiond(ω)=Ym(ω)/Yi(ω)。
M) predistortion amendment is carried out to the distortion estimated, the purpose of predistortion is to make the output letter of arbitrary waveform generator 2
Number as far as possible close to ideal intermediate-freuqncy signal.Therefore it needs to adjust the signal for uploading to arbitrary waveform generator 2；
N) the frequency spectrum X of up-delivering signal after adjusting1(ω)=Yi(ω)/Hd(ω)。
O) to X1(ω) carries out inverse Fourier transform, the up-delivering signal after being adjusted, and is uploaded to random waveform
Device 2.
P) step b) to step o) is primary complete predistortion amendment step, for the broadband for obtaining low Error Vector Magnitude
Modulated signal, such predistortion amendment may need to carry out repeatedly.
Q) it repeats step b) to step o) five times, real-time oscilloscope measures wideband vector modulated signal constellation as schemed at this time
Shown in 4, Error Vector Magnitude 2.9%.Using the wideband vector modulated signal error span modification method of the decorum of the present invention,
Be finally obtained the 1Gbaud character rate of high quality, 2GHz real-time bandwidth, 40GHz carrier frequency 64QAM wideband vector tune
Signal processed.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (9)
1. a kind of modified device of wideband vector modulated signal Error Vector Magnitude, which is characterized in that the device includes: to calculate
Machine, arbitrary waveform generator, upconverter, real-time oscilloscope and reference clock；
The computer is used to emulate the wave file for generating ideal modulated intermediate frequency signal and control real-time oscilloscope acquisition broadband
Vector modulation signal, and to carry out predistortion amendment to the wideband vector modulated signal；
The arbitrary waveform generator is used to convert modulated intermediate frequency signal for the wave file of the ideal modulated intermediate frequency signal；
And it exports square-wave signal and provides trigger signal for real-time oscilloscope；
The upconverter is used to up-convert to the modulated intermediate frequency signal wideband vector modulated signal of radio frequency；
The real-time oscilloscope is for acquiring the wideband vector modulated signal and measuring；
The reference clock is used to provide reference signal for the arbitrary waveform generator, upconverter and real-time oscilloscope.
2. the apparatus according to claim 1, which is characterized in that the device further include: the first power splitter and the second power splitter；
The reference signal that reference clock exports is divided into two-way by first power splitter, is separately input to the second power splitter and any
Waveform generator；
The reference signal that first power splitter inputs is divided into two-way by second power splitter, be separately input to upconverter and in real time
Oscillograph.
3. the apparatus of claim 2, which is characterized in that the reference signal is 10MHz reference signal.
4. device according to claim 3, which is characterized in that the reference clock is rubidium clock.
5. the apparatus according to claim 1, which is characterized in that the ideal modulated intermediate frequency signal is that Error Vector Magnitude is small
In 0.1% modulated intermediate frequency signal.
6. a kind of device according to claim 1-5 carries out the amendment of wideband vector modulated signal Error Vector Magnitude
Method, which comprises the following steps:
Computer Simulation generates the wave file of ideal modulated intermediate frequency signal and is uploaded in arbitrary waveform generator；
The wave file of the ideal modulated intermediate frequency signal is converted modulated intermediate frequency signal by arbitrary waveform generator, and is transmitted to
Upconverter carries out up-conversion, exports the wideband vector modulated signal of radio frequency；
Real-time oscilloscope is acquired measurement to the wideband vector modulated signal under control of the computer；
The wideband vector modulated signal Digital Down Convert measured is carried out Fourier transformation to intermediate frequency, and to it by computer, is obtained
Measure signal intermediate frequency frequency spectrum Ym(ω)；
The ideal intermediate-freuqncy signal for uploading to arbitrary waveform generator is subjected to Fourier transformation, obtains the intermediate frequency spectrum of ideal signal
Xi(ω)；
To the estimation H of system linear and faint non-linear distortiond(ω)=Ym(ω)/Yi(ω)；
Predistortion amendment is carried out to the distortion estimated, adjustment uploads to the signal of arbitrary waveform generator；Upper communication after adjustment
Number frequency spectrum X1(ω)=Yi(ω)/Hd(ω)；
To X1(ω) carries out inverse Fourier transform, the up-delivering signal after being adjusted, and is uploaded to arbitrary waveform generator；
Up-delivering signal adjusted is converted modulated intermediate frequency signal by arbitrary waveform generator, repeats above step, completes primary
Amendment.
7. according to the method described in claim 6, it is characterized in that, repeating repeatedly to correct, until wideband vector modulation letter
Number Error Vector Magnitude floating range is maintained in certain threshold value within a certain period of time；At this point, obtaining required high quality
Wideband vector modulated signal.
8. according to the method described in claim 6, it is characterized in that, the arbitrary waveform generator, upconverter and in real time
When oscillograph works, reference clock provides 10MHz reference signal for it.
9. according to the method described in claim 6, it is characterized in that, the arbitrary waveform generator is by the ideal IF Modulation
While the wave file of signal is converted into modulated intermediate frequency signal, rectangular wave is exported as real-time oscilloscope, trigger signal is provided.
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| CN112217579A (en) * | 2020-09-25 | 2021-01-12 | 北京无线电计量测试研究所 | Vector signal generation and device with adjustable error vector amplitude |
| CN112436906A (en) * | 2020-11-12 | 2021-03-02 | 军事科学院系统工程研究院军用标准研究中心 | Wireless modulation signal modulation quality parameter calibration equipment |
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| CN113848522A (en) * | 2021-09-10 | 2021-12-28 | 北京无线电计量测试研究所 | EMI measurement receiver impulse response calibration method and device |
| CN115173963A (en) * | 2022-07-06 | 2022-10-11 | 成都中创锐科信息技术有限公司 | Vector signal calibration method and device for vector signal generation equipment |
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| CN112217579A (en) * | 2020-09-25 | 2021-01-12 | 北京无线电计量测试研究所 | Vector signal generation and device with adjustable error vector amplitude |
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| CN113848522A (en) * | 2021-09-10 | 2021-12-28 | 北京无线电计量测试研究所 | EMI measurement receiver impulse response calibration method and device |
| CN113848522B (en) * | 2021-09-10 | 2023-10-13 | 北京无线电计量测试研究所 | Method and device for calibrating impulse response of EMI (electromagnetic interference) measurement receiver |
| CN115173963A (en) * | 2022-07-06 | 2022-10-11 | 成都中创锐科信息技术有限公司 | Vector signal calibration method and device for vector signal generation equipment |
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