CN101442368B - Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise - Google Patents
Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise Download PDFInfo
- Publication number
- CN101442368B CN101442368B CN2008102411722A CN200810241172A CN101442368B CN 101442368 B CN101442368 B CN 101442368B CN 2008102411722 A CN2008102411722 A CN 2008102411722A CN 200810241172 A CN200810241172 A CN 200810241172A CN 101442368 B CN101442368 B CN 101442368B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- output
- pass filter
- phase noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a phase noise simulator for a broadcast communication transmitter and a phase noise resistance test method, in particular a simulator device for simulating the phase noise of the broadcast communication transmitter and a method for performing a phase noise resistance test on a communication system. The phase noise simulator for the transmitter comprises a phase noise carrier generator, wherein the phase noise carrier generator is used for generating a carrier signal which satisfies a phase noise model, and the working frequency band of the simulator is set by a controller. The phase noise resistance test method tests SNR thresholds of the communication system under a Gaussian white noise channel and under the Gaussian white noise channel after being interfered by the phase noise to obtain a threshold difference produced by the two tests as the resistance of the system to the phase noise of the model. The method and the device can test the resistance of certain communication system to the interference of the phase noise of a plurality of models in a laboratory to summarize the ability of the system in resisting the phase noise, and can compare the performances of the systems to provide a reference for the research and development of the systems.
Description
Technical field
The invention belongs to the digital communication field tests, relate to a kind of broadcast communication transmitter make an uproar mutually simulator and the anti-performance test methods of making an uproar mutually, specifically, the present invention relates to a kind of simulator apparatus of broadcast communication transmitter phase noise and the method for communication system being carried out anti-phase noise performance test.
Background technology
Development along with digital communication technology, various new technology constantly produce, new digital communication system constantly occurs, the signal of Digital Modulation is compared with the signal of analog-modulated, bandwidth is wider, frequency is higher, and also more responsive on the impact of local oscillator noise in the conversion process, and this has higher requirement just for research and development and the manufacturing of equipment.
Phase noise is ubiquitous a kind of noise in the pierce circuit.By the device of oscillator self or all may be had influence on frequency and the amplitude of output signal by the noise of external input.As a rule, the disturbance of amplitude can be ignored or be unimportant, only has frequency shift (FS) at random to need to consider.The latter also can be regarded as the skew of cycle change at random, perhaps on time shaft the zero crossing time with respect to the skew of its ideal value.
For a pure cycle cosine signal, can be expressed as:
x(t)＝Acosω
ct
And be subject to the cosine signal that phase noise disturbs, can be expressed as:
x(t)＝Acos[ω
ct+φ
n(t)]
φ wherein
n(t) be that an indication cycle changes very little at random extra phase place.Function phi
n(t) be called phase noise.
In radio frequency applications, phase noise characterizes in frequency domain usually, for one desirable, be operated in ω
cSinusoidal oscillator, its frequency spectrum is an impulse, and usually has the actual oscillator of phase noise, its frequency spectrum shows as a skirt shape near carrier frequency, be not simple impulse.
In order to reduce the impact of phase noise, the transmitting terminal of communication system adopts high-quality oscillator by increasing cost, can reduce phase noise; The receiving terminal of communication system by improving reception technique, is revised the processing of phase noise, can reach the purpose that reduces to affect.
In traditional research process, large quantity research has been carried out in the mechanism that people have produced phase noise and the impact that how to reduce phase noise, and whether some communication system has been carried out large quantity research to the phase noise sensitivity on principle; But for how certain communication system of quantitative test is subjected to the degree of phase noise interference effect, not relevant method of testing and the description of testing equipment.
Therefore, need method of testing and a kind of simulator apparatus of the anti-phase noise performance of a kind of communication system, whether the system that comes some transmitter and receiver of quantitative test to consist of is responsive on the impact of phase noise.Existing phase noise measurement method is the size for the phase noise of measurand transmitter local oscillator, rather than for the ability of the anti-phase noise of testing communication system impact, does not mention similar method in the existing document; The function of simulator of making an uproar mutually is the analogue phase noise, does not also mention similar simulator apparatus in the existing document, so the phase noise simulator that the present invention proposes is necessary with the anti-performance test methods of making an uproar mutually.
In a word, the invention provides a kind of testing evaluation method and reconfigurable phase noise emulation platform, can use under various digital transmission systems and standard, test result supplies the researcher of emission system in the reference of equipment development.
Summary of the invention
The present invention proposes a kind of broadcast communication transmitter make an uproar mutually simulator and the anti-performance test methods of making an uproar mutually, specifically, the present invention relates to a kind of simulator apparatus of analog broadcasting communication transmitter phase noise and the method for communication system being carried out anti-phase noise performance test.
A kind of broadcast communication transmitter simulator of making an uproar mutually comprises:
The first frequency mixer: the radiofrequency signal of simulator input is inputted the first frequency mixer, and the first frequency mixer multiplies each other the carrier signal of input signal and the generation of the first local oscillator, and input signal is down-converted to intermediate-frequency band, and the intermediate-frequency band centre frequency is fixed value, is designated as f
m, the signal after the output frequency conversion is given the first low pass filter;
The first low pass filter: the signal after the down-conversion of the first frequency mixer output is carried out low-pass filtering, and filtering high frequency images component is exported to band pass filter;
Band pass filter: the signal to the output of the first low pass filter carries out bandpass filtering, the frequency component outside the filtering intermediate frequency, and the output intermediate-freuqncy signal is given the second frequency mixer;
The first local oscillator: produce first order carrier signal, frequency is by the controller setting, and frequency is designated as f
1, carrier signal is exported to the first frequency mixer;
The second local oscillator: produce the carrier to second order signal, frequency is fixed, and is designated as f
2, export to the second frequency mixer;
The second frequency mixer: the intermediate-freuqncy signal of band pass filter output and the carrier to second order of the second local oscillator generation are multiplied each other, intermediate-freuqncy signal is moved radio frequency, signal is given the second low pass filter after the output up-conversion;
The second low pass filter: the signal after the up-conversion of the second frequency mixer output is carried out low-pass filtering, and filtering high frequency images component is exported to three-mixer;
The carrier generator of making an uproar mutually: receive the control information that controller sends, produce the third level carrier signal that meets phase noise model, export to three-mixer;
Three-mixer: the signal multiplication of the third level carrier signal that the carrier generator of making an uproar is mutually sent and the output of the second low pass filter, signal to the output of the second low pass filter carries out frequency spectrum shift, signal after moving is exported to the 3rd low pass filter, and the signal after moving is identical with simulator input radio frequency signal center frequency;
The 3rd low pass filter: the signal after the high frequency images component in the filtering three-mixer output signal, filtering is as the output signal of the simulator of making an uproar mutually;
Controller: send control information with the carrier generator of making an uproar mutually to the first local oscillator, set the first order carrier frequency of the first local oscillator output, set the third level carrier frequency of the carrier generator output of making an uproar mutually, set phase noise model and the parameter of the carrier generator of making an uproar mutually, set the inner data source that adopts of the carrier generator of making an uproar mutually.
Make an uproar the mutually course of work of simulator of a kind of broadcast communication transmitter is:
The radiofrequency signal A of modulator output inputs the first frequency mixer, and establishing its centre frequency is f
sThe first local oscillator produces first order carrier wave B, and frequency is f
1, f
1Value set by the control signal J of controller output, carrier wave B exports to the first frequency mixer; Signal A and carrier wave B multiply each other in the first frequency mixer, and useful signal is moved intermediate-frequency band from the radio frequency band of signal A, and the output intermediate-freuqncy signal C give the first low pass filter, and the centre frequency of this intermediate-frequency band is fixed, and establishing this centre frequency is f
m, f wherein
m=f
s-f
1, and f
m＜＜f
s, f
m＜＜f
1Signal C enters the high fdrequency component f that the first low pass filter filters out optical mixing process produces
s+ f
1, become signal D; Signal D enters the noise component(s) outside the band pass filter filtering medium-frequency band, becomes signal E, exports to the second frequency mixer; The second local oscillator produces carrier to second order F, and the frequency of carrier wave F is made as f
2, f
2Be fixed value and be higher than modulator can output signal highest frequency, carrier wave F exports to the second frequency mixer; The second frequency mixer carries out mixing with signal E and carrier wave F, produces signal G to the second low pass filter, and two signal components are arranged among the signal G, and centre frequency is respectively at f
2-f
mAnd f
2+ f
mSignal G is through the higher f of the second low pass filter filters out frequency
2+ f
mComponent keeps centre frequency at f
2-f
mComponent, become signal H, export to three-mixer; Controller sends command signal K to the carrier generator of making an uproar mutually, and the carrier generator of making an uproar mutually produces the carrier wave L with phase noise according to the phase noise model of setting among the instruction K and parameter and third level carrier frequency, and the centre frequency of establishing carrier wave L is f
3, f should be arranged
3=f
2-f
m-f
s, f
3＞＞f
m(centre frequency is f to three-mixer with signal H
2-f
m) and carrier wave L (centre frequency is f
3) multiply each other, producing signal M, signal M has two frequency component f
2-f
m-f
3And f
2-f
m+ f
3Signal M inputs the 3rd low pass filter, and the 3rd low pass filter is with high fdrequency component f
2-f
m+ f
3Filtering keeps component f
2-f
m-f
3, and f is arranged
s=f
2-f
m-f
3, the 3rd low pass filter is output as signal N, and as the output signal of the simulator of making an uproar mutually, the frequency spectrum of signal N is identical with signal A with centre frequency, and signal N compares with signal A, has sneaked into the interference of Carrier Phase Noise.
The described carrier generator of making an uproar mutually comprises:
The first Gaussian white noise generator: produce the white Gaussian noise signal, export to analog to digital converter;
Analog to digital converter: the white Gaussian noise analog signal conversion that the first Gaussian white noise generator is exported is digital signal, exports to digital signal processing module;
Pseudo-random data generator: produce the pseudorandom number signal, export to digital signal processing module;
Digital signal processing module: receive the control information of controller input, control information comprises the frequency of phase noise production model, phase noise model parameter, third level carrier signal, to the selection setting of two-way input signal, after the receiving control information, digital signal processing module is modulated white Gaussian noise signal or the pseudo-random data of input, produces the digital carrier signal that meets phase noise model;
Digital to analog converter: the digital carrier signal that digital signal processing module is produced is converted to analog signal, exports to the 4th low pass filter;
The 4th low pass filter: the high frequency images component in the filtering input analog signal, output is as third level carrier signal.
The course of work of the described carrier generator of making an uproar mutually is:
Gaussian white noise generator produces the white Gaussian noise signal, sends to analog to digital converter; Analog to digital converter is digital signal with the white Gaussian noise analog signal conversion, the supplied with digital signal processing module; Pseudo-random data generator inside produces pseudo-random data by digital operation, the supplied with digital signal processing module; Digital signal processing module receives the instruction K that controller sends, and comprises among the instruction K: select white Gaussian noise signal or pseudo-random data signal to modulate, and to the data processing model of random signal, the centre frequency f of third level carrier wave
3Digital signal processing module is modulated white Gaussian noise signal or pseudo-random data according to instruction K, generates digital carrier signal with phase noise by low-pass filter unit and numerical frequency synthesis unit, and frequency is f
3Digital carrier signal becomes analog carrier signal through digital to analog converter.Since when the numeric field signal becomes the analog domain signal, can be at the high frequency images signal of frequency spectrum generation take sample rate as the cycle, and analog carrier signal only keeps centre frequency at f through low pass filter filters out high frequency images signal
3Signal, output as signal L.
Described digital signal processing module comprises:
Described numerical frequency synthesis unit: input signal is as the frequency control word of numerical frequency synthesis unit, and output meets the digital carrier signal of frequency control word, as the output signal of input signal or the digital signal processing module of multiplication unit;
Described low-pass filter unit: input signal is carried out low-pass filtering, and the result after the filtering is as the input signal of multiplication unit or numerical frequency synthesis unit;
Described multiplication unit: multiplication unit multiplies each other the two-way input signal, and the result who multiplies each other is as the output signal of input signal or the digital signal processing module of adder unit;
Described adder unit: the multiple signals of input are carried out sum operation, and the consequential signal after the output addition.
A kind of implementation method of described digital signal processing module comprises:
The first selector switch: the first selector switch receives the instruction K of controller, selects the signal P of analog to digital converter or the signal Q of pseudo-random data generator, exports to the first multiplication unit;
The first multiplication unit: the first multiplication unit receives the parameter k that controller is set
1, will be from signal and the parameter k of the first selector switch
1Multiply each other, the signal after multiplying each other is exported to the first adder unit;
The first adder unit: the first adder unit receives the parameter f that controller is set
3, will be from signal and the parameter f of the first multiplication unit
3Signal after the addition, addition is exported to the first low-pass filter unit;
The first low-pass filter unit: the first low-pass filter unit will carry out low-pass filtering from the signal of the first adder unit, the signal T after the output filtering
1Give the numerical frequency synthesis unit;
The numerical frequency synthesis unit: the numerical frequency synthesis unit will be from the signal T of the first low-pass filter unit
1As frequency control word, output is through the carrier signal R after the frequency modulation(FM), as the output signal of digital signal processing module.
The another kind of implementation method of described digital signal processing module comprises:
The second selector switch: the second selector switch receives the instruction K of controller, selects the signal P of analog to digital converter or the signal Q of pseudo-random data generator, exports to the second multiplication unit;
The second multiplication unit: the second multiplication unit receives the parameter k that controller is set
2, will be from signal and the parameter k of the second selector switch
2Multiply each other, the signal after multiplying each other is exported to the second low-pass filter unit;
The second low-pass filter unit: the second low-pass filter unit will carry out low-pass filtering from the signal of the second multiplication unit, the signal T after the output filtering
2Give the 3rd multiplication unit;
The numerical frequency synthesis unit: the numerical frequency synthesis unit receives the parameter f that controller is set
3, with this parameter f
3As frequency control word, the carrier signal of output certain frequency is given the 3rd multiplication unit;
The 3rd multiplication unit: will be from the signal T of the second low-pass filter unit
2Multiply each other with the carrier signal of numerical frequency synthesis unit, the signal R after the output multiplication is as the output signal of digital signal processing module.
The anti-phase noise performance method of testing of a kind of communication system comprises the steps:
Step 1: send data to modulator by the transimiison analysis instrument, modulator is modulated data after the frequency conversion, send radio-frequency transmission signals to mixer, the second Gaussian white noise generator output white Gaussian noise signal is to mixer, mixer is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver, and the data of output send to the transimiison analysis instrument after the receiver demodulation, measure the white Gaussian noise thresholding of transmission system this moment, be designated as h
1, the dB of unit;
A) the transimiison analysis instrument sends data to modulator, modulator is modulated frequency conversion with data, send radio-frequency transmission signals to mixer, the second Gaussian white noise generator output white Gaussian noise signal is to mixer, mixer is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver;
B) power output with modulator is set as certain value c
0, the dBm of unit is made as 0 with the output of the second Gaussian white noise generator, and receive the interference that signal is not subject to white noise this moment, and receiver normally receives;
C) receiver sends to the transimiison analysis instrument with the code stream after the demodulation, and the transimiison analysis instrument shows that this moment, transmission error rates was 0;
D) power output of increase the second Gaussian white noise generator progressively strengthens the white Gaussian noise of sneaking into signal, until receiver can not normally receive;
E) progressively reduce the power output of the second Gaussian white noise generator, until receiver recovers to receive, the transimiison analysis instrument shows that the error rate is lower than threshold value e;
F) measure the at this moment power output of the second Gaussian white noise generator, be designated as n
1, the dBm of unit;
G) with carrier-to-noise ratio c
0/ n
1As the carrier-to-noise ratio thresholding h of system under Gaussian white noise channel
1, the dB of unit.
Step 2: phase noise model and the parameter of setting the simulator of making an uproar mutually, send data by the transimiison analysis instrument to modulator, modulator is modulated data after the frequency conversion, send radio-frequency transmission signals to the simulator of making an uproar mutually, the simulator of making an uproar mutually outputs signal to mixer sneak into phase noise in signal transmission after, the second Gaussian white noise generator output white Gaussian noise signal is to mixer, mixer will be sneaked into signal and the white Gaussian noise signal plus of phase noise, signal after the output addition is to receiver, the data of output send to the transimiison analysis instrument after the receiver demodulation, the operating state of measuring receiver under this makes an uproar model mutually and the white Gaussian noise thresholding of transmission system, operating state result is divided into normal reception and takes defeat, and thresholding is designated as h
2, the dB of unit;
A) the transimiison analysis instrument sends data to modulator, modulator is modulated frequency conversion with data, send radio-frequency transmission signals to the simulator of making an uproar mutually, the simulator of making an uproar mutually outputs signal to mixer sneak into phase noise in signal transmission after, the second Gaussian white noise generator output white Gaussian noise signal is to mixer, mixer will be sneaked into signal and the white Gaussian noise signal plus of phase noise, and the signal after the output addition is to receiver;
B) phase noise model of setting the simulator of making an uproar mutually is model N
p
C) the transimiison analysis instrument sends to modulator with test code streams, and signal sent to the simulator of making an uproar mutually after modulator will be modulated, and receiver sends to the transimiison analysis instrument with the code stream after the demodulation;
D) power output with the simulator of making an uproar mutually is set as certain value c
0, the dBm of unit is made as 0 with the output of the second Gaussian white noise generator, receive the interference that signal only is subject to phase noise this moment, if receiver can not normally receive, perhaps the error rate is greater than thresholding e, illustrate that then this communication system takes defeat under this phase noise impact, test finishes; If the transimiison analysis instrument shows the error rate less than thresholding e, then explanation receives normally, carries out next step;
E) power output of increase the second Gaussian white noise generator progressively strengthens the white Gaussian noise of sneaking into signal, until receiver can not normally receive;
F) progressively reduce the power output of the second Gaussian white noise generator, until receiver recovers to receive, the transimiison analysis instrument shows that the error rate is lower than threshold value;
G) measure the at this moment power output of the second Gaussian white noise generator, be designated as n
2, the dBm of unit;
H) with carrier-to-noise ratio c
0/ n
2Thresholding h as system's Gaussian white noise channel under this phase noise disturbs
2, the dB of unit.
Step 3: the operating state that comparison step one and step 2 record and the thresholding under the Gaussian white noise channel, the operating state that step 2 and step 1 record and the deterioration degree of thresholding are h
2-h
1, being designated as Δ h, the dB of unit is as the ability of anti-this model phase noise of communication system.
If the operating state of measuring receiver is d in the step 2) step results is for taking defeat, and is recorded as so this communication system at phase noise model N
pLower cisco unity malfunction; If d in the step 2) step results is normal for receiving, difference h between the thresholding that draws of calculation procedure two and step 1 then
2-h
1, being designated as Δ h, the dB of unit is as the anti-phase noise model N of this communication system
pPerformance index.
Step 4: after a kind of communication system of test, draw another kind of communication system at same phase noise model N
pUnder performance, need this communication system is connected with testing equipment according to the step 1 mode of being connected with step 2, the same model N that makes an uproar mutually is set in the step 2
p, repeating step one obtains the performance of this communication system under the same model of making an uproar mutually to step 3, and then relatively the ability of two kinds of anti-phase noises of communication system is good and bad.If the poor Δ h of rear a kind of communication system thresholding, thinks then that the anti-phase noise performance of rear a kind of communication system is better than front a kind of system less than front a kind of system, otherwise then is worse than front a kind of system.
Measured signal and institute add Gauss's white noise and are in radio frequency band or intermediate-frequency band in the above-mentioned test process.The input signal of phase noise simulator is identical with the centre frequency of output signal.
Described a kind of broadcast communication transmitter simulator of making an uproar mutually is the phase noise analog machine in the test macro, can sneak into the Carrier Phase Noise of particular model in signal transmission according to the needs of test, is used for the test of anti-phase noise performance.Wherein the input signal of phase noise analog machine and output signal all are radiofrequency signals, can directly connect the receiver of radio-frequency modulator and radiofrequency signal.The phase noise simulator contains a plurality of oscillators among the present invention, the carrier signal that each oscillator produces is not desirable simple signal, also can comprise certain phase noise, but can think by analysis, the phase noise of oscillator itself is compared very little with the interference that phase noise model causes, can ignore.
The anti-phase noise performance method of testing of above-mentioned a kind of communication system, make system be in a kind of environment that can quantitatively add phase noise, by the system's Gaussian white noise channel signal-noise ratio threshold that under the out of phase noise model, records, can comprehensively draw the performance that the anti-phase noise of this communication system disturbs.
The present invention is mainly used in the test of high-frequency digital communication system, and along with the raising of communication system carrier frequency, phase noise is more obvious, and is larger on the impact of system, uses the present invention can record in the development stage of system the impact that system is subjected to phase noise.In addition, the present invention can be used for the contrast of different emissions, receiving system transmission plan and select, be subjected to the impact of phase noise relatively remarkable such as multi-carrier communications systems, it is stronger that carrier wave communication system resists the phase noise interference performance mutually, can use method of testing of the present invention to compare and select in the primary stage of system schema.In a word, the invention provides a kind of flexibly phase noise emulation platform, can be applied to various communication systems and standard, mainly test for communication system performance.
The distortion simulator of a kind of broadcast communication transmitter of the present invention and anti-advantage of making an uproar mutually performance test methods are:
(1) under the condition that does not need high-power transmitter, carries out the test of the anti-phase noise performance of system, reduced the complexity of experiment.
(2) the input/output port centre frequency of the simulator of making an uproar mutually of a kind of broadcast communication transmitter of the present invention is by the controller setting, can adapt to multiple emission, receiving equipment is tested under a plurality of frequency ranges.
(3) the present invention is with the phase noise distortion of a multiple transmitter of equipment simulating, and parameter sets up on their own by the user, saved experimental cost.
Description of drawings
Fig. 1 is make an uproar the mutually internal frame diagram of simulator of a kind of broadcast communication transmitter of the present invention;
Fig. 2 is make an uproar the mutually internal frame diagram of the carrier generator of making an uproar mutually of simulator of a kind of broadcast communication transmitter of the present invention;
Fig. 3 is one of test macro equipment block diagram of the anti-performance test methods of making an uproar mutually of a kind of communication system of the present invention;
Fig. 4 be the anti-performance test methods of making an uproar mutually of a kind of communication system of the present invention test macro equipment block diagram two;
Fig. 5 is a kind of broadcast communication transmitter of the present invention one of digital signal processing module algorithm schematic diagram of simulator of making an uproar mutually;
Fig. 6 be a kind of broadcast communication transmitter of the present invention make an uproar mutually simulator digital signal processing module algorithm schematic diagram two;
Fig. 7 is that the phase noise model spectrogram is given an example in the anti-phase noise performance method of testing of a kind of communication system of the present invention;
Fig. 8 is a kind of broadcast communication transmitter of the present invention pseudo-random data example waveform figure that the pseudo-random data generator of the carrier generator of making an uproar mutually of simulator produces that makes an uproar mutually;
Fig. 9 is make an uproar the mutually frequency spectrum example 1 that contains the carrier wave L that makes an uproar mutually of simulator output of a kind of broadcast communication transmitter of the present invention;
Figure 10 is make an uproar the mutually frequency spectrum example 2 that contains the carrier wave L that makes an uproar mutually of simulator output of a kind of broadcast communication transmitter of the present invention.
Among the figure: 1. modulator 2. simulator 21. first frequency mixers 22. first low pass filters of making an uproar mutually
23. band pass filter 24. second local oscillators 25. second frequency mixers 26. second low pass filters
The carrier generator 27. the first local oscillator 28. controllers 29. are made an uproar mutually
291. the first Gaussian white noise generator 292. analog to digital converters 293. pseudo-random data generators
294. digital signal processing module 2940. first selector switches 2941. first multiplication units
2942. the first adder unit 2943. first low-pass filter units 2944. numerical frequency synthesis units
2945. the second selector switch 2946. second multiplication units 2947. second low-pass filter units
2948. the 3rd multiplication unit 295 digital to analog converters 296. the 4th low pass filter
210. three-mixer 211. the 3rd low pass filter
3. the second Gaussian white noise generator 4. mixers 5. receivers 6. transimiison analysis instrument
Embodiment
A kind of broadcast communication transmitter simulator of making an uproar mutually, as shown in Figure 1, comprise the first frequency mixer 21, the first low pass filter 22, band pass filter 23, the second local oscillator 24, the second frequency mixer 25, the second low pass filter 26, the first local oscillator 27, controller 28, mutually make an uproar carrier generator 29, three-mixer 210, the 3rd low pass filter 211.
The radiofrequency signal A of modulator 1 output inputs the first frequency mixer, and establishing its centre frequency is f
s, bandwidth is W
s, and W
s＜＜f
s
The first local oscillator 27 produces first order carrier wave B, and frequency is f
1, f
1Value set by the control signal J of controller 28 output, and f is arranged
1=f
s-f
m, f
mBe the centre frequency of intermediate-freuqncy signal C, carrier wave B exports to the first frequency mixer 21;
Signal A and carrier wave B multiply each other in the first frequency mixer 21, and input signal A is moved intermediate-frequency band from radio frequency band, output intermediate-freuqncy signal C, and the centre frequency of this intermediate-frequency band is fixed, and centre frequency is f
m, f is arranged
m=f
s-f
1, and f
m＜＜f
s, f
m＜＜f
1, signal C also comprises high fdrequency component f except comprising intermediate frequency component
s+ f
1, signal C exports to the first low pass filter 22;
Intermediate-freuqncy signal C enters the high fdrequency component f that the first low pass filter 22 filtering optical mixing process produce
s+ f
1, becoming signal D, signal D centre frequency is f
m, bandwidth is W
s, signal D exports to band pass filter 23;
Signal D enters the clutter component outside the band pass filter 23 filtering medium-frequency bands, and output signal E gives the second frequency mixer 25;
The second local oscillator 24 produces a high frequency carrier to second order F, and the frequency of high frequency carrier F is made as f
2, f
2Fixed value and the highest frequency that is higher than 1 energy output signal of modulator, i.e. f
2＞f
s, f
2＞f
1, carrier wave F exports to the second frequency mixer 25;
The second frequency mixer 25 multiplies each other signal E and carrier wave F, produces signal G, contains two components among the signal G, and centre frequency is respectively at f
2-f
mAnd f
2+ f
m, signal G exports to the second low pass filter 26;
Signal G is through the higher f of the second low pass filter 26 rejection frequencies
2+ f
mComponent keeps centre frequency at f
2-f
mComponent, output signal H gives three-mixer 210;
Controller 28 sends command signal K to the carrier generator 29 of making an uproar mutually, the carrier generator 29 of making an uproar mutually receives the frequency of phase noise production model that content among the instruction K comprises setting, phase noise model parameter, third level carrier signal, the third level carrier wave L that the carrier generator 29 of making an uproar mutually produces with phase noise, the centre frequency of establishing carrier wave L is f
3, f should be arranged
3=f
2-f
m-f
s, f
3＞＞f
m, carrier wave L exports to three-mixer 210;
(centre frequency is f to three-mixer 210 with signal H
2-f
m) and carrier wave L (centre frequency is f
3) multiply each other, producing signal M, signal M contains two frequency component f
2-f
m-f
3And f
2-f
m+ f
3, signal M exports to the 3rd low pass filter 211;
Signal M inputs the 3rd low pass filter 211, the three low pass filters 211 with the high fdrequency component f among the signal M
2-f
m+ f
3Filtering keeps component f
2-f
m-f
3, and f is arranged
s=f
2-f
m-f
3, output signal N, the centre frequency of signal N is f
s, bandwidth is W
s, the frequency spectrum of signal N is all identical with signal A with centre frequency, but signal N compares with signal A, sneaked into the interference of Carrier Phase Noise, reached the purpose that adds phase noise model.
As shown in Figure 2, the described carrier generator 29 of making an uproar mutually comprises the first Gaussian white noise generator 291, analog to digital converter 292, pseudo-random data generator 293, digital signal processing module 294, digital to analog converter 295, the 4th low pass filter 296.
The first Gaussian white noise generator 291 produces the white Gaussian noise signal, exports to analog to digital converter 292;
Analog to digital converter 292 is digital signal P with the white Gaussian noise analog signal conversion of the first Gaussian white noise generator 291 outputs, and signal P exports to digital signal processing module 294;
Pseudo-random data generator 293 inside produce pseudo-random data signal Q, signal Q supplied with digital signal processing module 294 by digital operation;
Digital signal processing module 294 receives the control information K that controller 28 sends, and control information comprises the frequency f of phase noise production model, phase noise model parameter, third level carrier signal
3, to the selection setting of two-way input signal, after the receiving control information, white Gaussian noise signal or the pseudo-random data of 294 pairs of inputs of digital signal processing module are modulated, and produce the digital carrier signal R that meets phase noise model, export to digital to analog converter 295;
Digital to analog converter 295 is converted to analog carrier signal S with digital carrier signal R, exports to the 4th low pass filter 296;
Since when digital signal R becomes analog signal S, can be at the image signal of frequency spectrum generation take sample rate as the cycle, and the high frequency images component among the 4th low pass filter 296 filtering analog carrier signal S only keeps centre frequency at f
3Signal, output signal L to the three-mixer 210.
Fig. 3 is a kind of structure example of described digital signal processing module 294, comprises the first selector switch 2940, the first multiplication unit 2941, the first adder unit 2942, the first low-pass filter unit 2943, numerical frequency synthesis unit 2944.This example is realized the frequency modulation modulation to the input random signal.Detailed process is: input instruction K sets the selection of the first selector switch 2940, sets the parameter k of the first multiplication unit 2941
1, set the parameter f of the first adder unit
3Numeral white noise signal P and pseudo-random data signal Q input the first selector switch 2940, the first selector switches 2940 according to input instruction K, select signal P or signal Q to enter the first multiplication unit 2941; The first multiplication unit 2941 is with signal and the parameter k of 2940 inputs of the first selector switch
1Multiply each other, Output rusults is given the first adder unit 2942; The first adder unit 2942 is with input signal and parameter f
3The first low-pass filter unit 2943 is exported in addition; 2943 pairs of input signals of the first low-pass filter unit carry out band limiting filtering, signal T behind the output filtering
1Give numerical frequency synthesis unit 2944; Numerical frequency synthesis unit 2944 is with input signal T
1As the output frequency control word, be equivalent to input signal T
1Carry out the frequency modulation modulation, digital carrier signal R after the output modulation.
Fig. 4 is the another kind of structure example of described digital signal processing module 294, comprises the second selector switch 2945, the second multiplication unit 2946, the second low-pass filter unit 2947, the 3rd multiplication unit 2948, numerical frequency synthesis unit 2944.This example is realized the amplitude-modulating modulation to the input random signal.Detailed process is: input instruction K sets the selection of the second selector switch 2945, sets the parameter k of the second multiplication unit 2946
2, the parameter f of setting numerical frequency synthesis unit 2944
3Numeral white noise signal P and pseudo-random data signal Q input the second selector switch 2945, the second selector switches 2945 according to input instruction K, select signal P or signal Q to enter the second multiplication unit 2946; The second multiplication unit 2946 is with signal and the parameter k of 2945 inputs of the second selector switch
2Multiply each other, Output rusults is given the second low-pass filter unit 2947; 2947 pairs of input signals of the second low-pass filter unit carry out band limiting filtering, signal T behind the output filtering
2Give the 3rd multiplication unit 2948; Numerical frequency synthesis unit 2944 is with parameter f
3As frequency control word, the output digital carrier signal is given the 3rd multiplication unit 2948; The 3rd multiplication unit 2948 is with input signal T
2Multiply each other with digital carrier signal, be equivalent to input signal T
2Carry out amplitude-modulating modulation, digital carrier signal R after the output amplitude modulation.
The anti-phase noise performance method of testing of a kind of communication system comprises the steps:
Step 1: send data to modulator 1 by transimiison analysis instrument 6, modulator 1 is modulated data after the frequency conversion, send radio-frequency transmission signals to mixer 4, the second Gaussian white noise generator 3 output white Gaussian noise signals are to mixer 4, mixer 4 is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver 5, and the data of output send to transimiison analysis instrument 6 after receiver 5 demodulation, measure the white Gaussian noise thresholding of transmission system this moment, be designated as h
1, the dB of unit, described each equipment connecting relation is as shown in Figure 5;
A) transimiison analysis instrument 6 sends data to modulator 1, modulator 1 is modulated frequency conversion with data, send radio-frequency transmission signals to mixer 4, the second Gaussian white noise generator 3 output white Gaussian noise signals are to mixer 4, mixer 4 is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver 5;
B) power output with modulator 1 is set as certain value c
0, the dBm of unit is made as 0 with the output of the second Gaussian white noise generator 3, and receive the interference that signal is not subject to white noise this moment, and receiver 5 normally receives;
C) receiver 5 sends to transimiison analysis instrument 6 with the code stream after the demodulation, and transimiison analysis instrument 6 shows that this moment, transmission error rates was 0;
D) power output of increase the second Gaussian white noise generator 3 progressively strengthens the white Gaussian noise of sneaking into signal, until receiver 5 can not normally receive;
E) progressively reduce the power output of the second Gaussian white noise generator 3, until receiver 5 recovers to receive, the transimiison analysis instrument shows that the error rate is lower than threshold value e;
F) measure the at this moment power output of the second Gaussian white noise generator 3, be designated as n
1, the dBm of unit;
G) with carrier-to-noise ratio c
0/ n
1As the carrier-to-noise ratio thresholding h of system under Gaussian white noise channel
1, the dB of unit.
Step 2: phase noise model and the parameter of setting the simulator 2 of making an uproar mutually, send data by transimiison analysis instrument 6 to modulator 1, modulator 1 is modulated data after the frequency conversion, send radio-frequency transmission signals to the simulator 2 of making an uproar mutually, the simulator 2 of making an uproar mutually outputs signal to mixer 4 sneak into phase noise in signal transmission after, the second white Gaussian noise 3 generators output white Gaussian noise signal is to mixer 4, mixer 4 will be sneaked into signal and the white Gaussian noise signal plus of phase noise, signal after the output addition is to receiver 5, the data of output send to transimiison analysis instrument 6 after receiver 5 demodulation, the operating state of measuring receiver 5 under this makes an uproar model mutually and the white Gaussian noise thresholding of transmission system, operating state result is divided into normal reception and takes defeat, and thresholding is designated as h
2, the dB of unit accesses the equipment connecting relation of the simulator 2 of making an uproar mutually as shown in Figure 6;
A) transimiison analysis instrument 6 sends data to modulator 1, modulator 1 is modulated frequency conversion with data, send radio-frequency transmission signals to the simulator 2 of making an uproar mutually, the simulator 2 of making an uproar mutually outputs signal to mixer 4 sneak into phase noise in signal transmission after, the second Gaussian white noise generator 3 output white Gaussian noise signals are to mixer 4, mixer 4 will be sneaked into signal and the white Gaussian noise signal plus of phase noise, and the signal after the output addition is to receiver 5;
B) set the test phase noise model of the simulator 2 of making an uproar mutually, called after model N
p
C) transimiison analysis instrument 6 sends to modulator 1 with test code streams, and signal sent to the simulator 2 of making an uproar mutually after modulator 1 will be modulated, and receiver 5 sends to transimiison analysis instrument 6 with the code stream after the demodulation;
D) power output with the simulator 2 of making an uproar mutually is set as certain value c
0, the dBm of unit is made as 0 with the output of the second Gaussian white noise generator 3, receive the interference that signal only is subject to phase noise this moment, if receiver can not normally receive, perhaps the error rate is greater than thresholding e, illustrate that then this communication system takes defeat under this phase noise impact, test finishes; If transimiison analysis instrument 6 shows the error rate less than thresholding e, then explanation reception 5 is normal, carries out next step;
E) power output of increase the second Gaussian white noise generator 2 progressively strengthens the white Gaussian noise of sneaking into signal, until receiver 5 can not normally receive;
F) progressively reduce the power output of the second Gaussian white noise generator 3, until receiver 5 recovers to receive, transimiison analysis instrument 6 shows that the error rates are lower than threshold value;
G) measure the at this moment power output of the second Gaussian white noise generator 2, be designated as n
2, the dBm of unit;
H) with carrier-to-noise ratio c
0/ n
2Thresholding h as system's Gaussian white noise channel under this phase noise disturbs
2, the dB of unit.
Step 3: the operating state that comparison step one and step 2 record and the thresholding under the Gaussian white noise channel, the operating state that step 2 and step 1 record and the deterioration degree of thresholding are h
2-h
1, being designated as Δ h, the dB of unit is as the ability of anti-this model phase noise of communication system.
If the operating state of measuring receiver is d in the step 2) step results is for taking defeat, and is recorded as so this communication system at phase noise model N
pLower cisco unity malfunction; If d in the step 2) step results is normal for receiving, difference h between the thresholding that draws of calculation procedure two and step 1 then
2-h
1, being designated as Δ h, the dB of unit is as the anti-phase noise model N of this communication system
pPerformance index.
Step 4: after a kind of communication system of test, draw another kind of communication system at same phase noise model N
pUnder performance, need this communication system is connected with testing equipment according to the step 1 mode of being connected with step 2, the same model N that makes an uproar mutually is set in the step 2
p, repeating step one obtains the performance of this communication system under the same model of making an uproar mutually to step 3, and then relatively the ability of two kinds of anti-phase noises of communication system is good and bad.If the poor Δ h of rear a kind of communication system thresholding, thinks then that the anti-phase noise performance of rear a kind of communication system is better than front a kind of system less than front a kind of system, otherwise then is worse than front a kind of system.
Measured signal and institute add Gauss's white noise and are in radio frequency band or intermediate-frequency band in the above-mentioned test process.The input signal of phase noise simulator is identical with the centre frequency of output signal.
The below illustrates principle and the course of work of method of testing of the present invention take the digital TV ground radio broadcasting as example:
The digital TV ground wireless broadcast system is as a kind of typical Wireless Broadband Communication Systems, because transmitting power is large, carrier frequency is high, generally need repeatedly frequency conversion can realize frequency spectrum shift, use oscillator quantity more, so phase noise is one of a kind of main interference in the broadcast transmitter.The modulation system that the wireless broadcast system of different systems adopts is different, such as single carrier or multi-carrier modulation, its performance characteristics is different, for example, it is generally acknowledged, multi-carrier modulation disturbs multipath good inhibitory action, and the single-carrier modulated mode has good antijamming capability to frequency deviation and phase noise.And concrete interference free performance is also different along with the variation of system operational parameters.
Adopt the anti-phase noise performance method of testing among the present invention, can test the anti-phase noise performance of different modulating mode, the test result that draws provides important references for the development and application of system as the anti-phase noise performance of this system.
Certain anti-phase noise performance test process of two kinds of digital TV ground wireless broadcast communication systems (being called first system and second system), equipment connecting relation as shown in Figure 5 and Figure 6, step is:
Step 1: test first system is when affecting without phase noise, and the thresholding under Gaussian white noise channel, equipment connecting relation are as shown in Figure 5.
A) send data by transimiison analysis instrument 6 to modulator 1, modulator 1 is modulated frequency conversion with data, send radio-frequency transmission signals to mixer 4, the second Gaussian white noise generator 3 output white Gaussian noise signals are to mixer 4, mixer 4 is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver 5;
B) power output with modulator 1 is set as certain value c
0, be made as-53dBm, the output of the second Gaussian white noise generator 3 is made as 0, this moment, signal was not subject to the interference of white noise, and receiver 5 normally receives;
C) receiver 5 sends to transimiison analysis instrument 6 with the code stream after the demodulation, and transimiison analysis instrument 6 shows that this moment, transmission error rates was 0;
D) power output of increase Gaussian white noise generator 3 progressively strengthens the white Gaussian noise of sneaking into signal, until receiver 5 can not normally receive;
E) progressively reduce the power output of the second Gaussian white noise generator 3 take 0.1dBm as unit, until receiver 5 recovers to receive, transimiison analysis instrument 6 shows and the error rates is lower than threshold value e (value of establishing e is 3 * 10
-6);
F) measure the at this moment power output of the second Gaussian white noise generator 3, be designated as n
1, for example, this moment, the second Gaussian white noise generator power output was-63dBm;
G) calculate carrier-to-noise ratio c
0/ n
1=-53dBm-(63dBm)=and 10dB, the carrier-to-noise ratio thresholding h of first system under Gaussian white noise channel
1=10dB.
Step 2: in test macro, add the simulator 2 of making an uproar mutually, make the signal of first system modulation device 1 through exporting to again mixer 4 after the phase noise simulator 2, measure the thresholding of system's this moment under Gaussian white noise channel, equipment connecting relation as shown in Figure 6:
A) transimiison analysis instrument 6 sends data to modulator 1, modulator 1 is modulated frequency conversion with data, send radio-frequency transmission signals to the simulator 2 of making an uproar mutually, the simulator 2 of making an uproar mutually outputs signal to mixer 4 sneak into phase noise in signal transmission after, the second Gaussian white noise generator 3 output white Gaussian noise signals are to mixer 4, mixer 4 will be sneaked into signal and the white Gaussian noise signal plus of phase noise, and the signal after the output addition is to receiver 5;
B) set phase noise model in the simulator 2 of making an uproar mutually, called after model N
p, N
pDefinition among example such as Fig. 7 and the table 1;
Table 1
| The frequency label | Frequency values | Phase noise (dBc/Hz) |
| f a | 1kHz | -52 |
| -f a | -1kHz | -52 |
| f b | 10kHz | -64 |
| -f b | -10kHz | -64 |
| f c | 100kHz | -73 |
| -f c | -100kHz | -73 |
C) transimiison analysis instrument 6 sends to modulator 1 with test code streams, and signal sent to the simulator 2 of making an uproar mutually after modulator 1 will be modulated, and receiver 5 sends to transimiison analysis instrument 6 with the code stream after the demodulation;
D) power output with phase noise simulator 2 is set as certain value c
0, such as-53dBm, the output of the second Gaussian white noise generator 3 being made as 0, receive the interference that signal only is subject to phase noise this moment, and receiver 5 normally receives;
E) power output of increase the second Gaussian white noise generator 3 progressively strengthens the white Gaussian noise of sneaking into signal, until receiver 5 can not normally receive;
F) progressively reduce the power output of the second Gaussian white noise generator 3 take 0.1dBm as unit, until receiver 5 recovers to receive, transimiison analysis instrument 6 shows and the error rates is lower than threshold value e (value of establishing e is 3 * 10
-6);
G) measure the at this moment power output of the second Gaussian white noise generator 3, be designated as n
2, for example, this moment, the Gaussian white noise generator power output was-64dBm;
H) with carrier-to-noise ratio c
0/ n
2=-53dBm-(64dBm)=11dB as the first system under this phase noise disturbs, the thresholding h of Gaussian white noise channel
2=11dB can find out, because the interference of phase noise, the thresholding of first system under Gaussian white noise channel worsens to some extent.
Step 3: difference DELTA h=h between the thresholding that calculates
2-h
1=1dB, with Δ h as the anti-phase noise model N of first system
pPerformance index.
Step 4: to second system repeats steps one to step 3, if the second system is at phase noise model N
pThe Lower Threshold difference is higher than the thresholding difference (1dB) of first system, and for example the thresholding difference of second system illustrates the anti-phase noise model N of second system greater than 1dB or take defeat
pPerformance Ratio first system poor; On the contrary, if the thresholding difference of second system, then illustrates the anti-phase noise model N of second system less than 1dB
pPerformance Ratio first system to get well.
Table 1 is to the data declaration of Fig. 7 phase noise model spectrogram in the anti-phase noise performance method of testing of a kind of communication system of the present invention;
Measured signal and institute add Gauss's white noise and all are in radio frequency band in the test process, and the input signal of phase noise simulator 2 is identical with the centre frequency of output signal, can test in the situation that does not change the original system structure like this.After the single test, the result who draws is the performance of this communication system under this phase noise model, draw the performance of communication system under other phase noise models, needs to set other models of making an uproar mutually and again tests by step 1 to step 3.Test after the performance under a plurality of phase noise models, can comprehensively sum up the performance that draws the anti-phase noise of this communication system.
In a specific embodiment 1 of the carrier generator 29 of making an uproar mutually of the present invention, digital signal processing module 294 is selected digital white Gaussian noise signal is modulated, modulation system is mode of frequency regulation, and structure is established the digital white Gaussian noise signal T through the first low-pass filter unit 2943 as shown in Figure 3
1Be N
0(t), be converted to digital carrier signal through numerical frequency synthesis unit 2944, again through digital to analog converter 295 become analog signal, again through after the 4th low pass filter 296 filtering image component, outgoing carrier signal L (is made as s
L(t)) expression formula is:
s
L(t)＝Acos{2π[f
3+k
1·N
0(t)]t+φ(t)}
Wherein, A is the outgoing carrier amplitude, f
3Be carrier reference frequency, k
1Be coefficient of frequency modulation, φ (t) is phase variant (being constant in this example).
In this example, the output frequency of numerical frequency synthesis unit 2944 is f in the digital signal processing module 294
3, the conversion bit wide of analog to digital converter 292 is 10, and it is 0 that simulation white Gaussian noise signal is quantified as average by analog to digital converter 292, and variance is 2
7Digital white Gaussian noise signal; The reference clock of numerical frequency synthesis unit 2944 is 500MHz, and the frequency control word bit wide is 32, and the resolving power that can calculate frequency synthesis is 500MHz/2
32=0.1164Hz, here k
1Can be understood as the least unit multiple that input modulating signal is converted to frequency modulation deviation, work as k
1=1 o'clock, the peak frequency that the white noise of input causes was changed to 0.1164Hz * 2
10=119.2Hz works as k
1When becoming large, the respective phase noise is just larger.Fig. 8 is k
1=5 o'clock carrier signal L spectral shape, Fig. 9 is k
1=20 o'clock carrier signal L spectral shape can be found out more abominable than among Fig. 9 of phase noise among Figure 10, that is to say, by amplitude size and the coefficient of frequency modulation k of control inputs white Gaussian noise
1Value, can set the phase noise size of sneaking in the carrier wave, reach the requirement of test model.
In a specific embodiment 2 of the carrier generator 29 of making an uproar mutually of the present invention, structure as shown in Figure 3, the data source of digital signal processing module 294 adopts the signal of pseudo-random data generator 293 outputs, pseudo-random data is that average is 0, variance is 2
7The random integers that meet Gaussian Profile, waveform as shown in figure 10, modulation system adopts mode of frequency regulation, adopts the parameter identical with upper example to control, and forms satisfactory phase noise.Adopt the data advantage of pseudo-random data generator to be that the generation of random data is subjected to the impact of physical environment very little, element manufacturing is simple, cost is low, and can change arbitrarily the regularity of distribution that generates pseudo-random data etc.
In the present invention makes an uproar a specific embodiment 3 of carrier generator 29 mutually, structure as shown in Figure 4, in the digital signal processing module 294 signal of pseudo-random data generator 293 outputs carried out amplitude-modulating modulation, structure is established the pseudo-random data signal T through the second low-pass filter unit 2947 as shown in Figure 4
2Be N
1(t), multiply each other with carrier signal in multiplication unit 2948, output digital carrier signal R becomes analog carrier signal by digital to analog converter 295 again, and by the 4th low pass filter filters out image component, output signal L (is made as s again
L(t)) expression formula is:
s
L(t)＝Acos[2πf
3t]·k
2·N
1(t)
Wherein, A is the outgoing carrier amplitude, f
3Be carrier reference frequency, k
2Be amplitude modulation coefficient.Having sneaked into phase noise by amplitude-modulating modulation in carrier wave, is the another kind of method that realizes phase noise model.
Claims (8)
1. broadcast communication transmitter simulator of making an uproar mutually, it is characterized in that, comprise the first frequency mixer, the first low pass filter, band pass filter, the first local oscillator, the second local oscillator, the second frequency mixer, the second low pass filter, mutually make an uproar carrier generator, three-mixer, the 3rd low pass filter, controller;
Described the first frequency mixer: the radiofrequency signal of simulator input and the first order carrier signal of the first local oscillator generation are multiplied each other, and with input radio frequency signal down-conversion, the signal after the output down-conversion is given the first low pass filter;
Described the first low pass filter: the signal after the down-conversion of the first frequency mixer output is carried out low-pass filtering, and filtering high frequency images component is exported to band pass filter;
Described band pass filter: the signal to the output of the first low pass filter carries out bandpass filtering, the frequency component outside the filtering intermediate frequency, and the output intermediate-freuqncy signal is given the second frequency mixer;
Described the first local oscillator: produce first order carrier signal, frequency is by the controller setting, and carrier signal is exported to the first frequency mixer;
Described the second local oscillator: produce the carrier to second order signal, export to the second frequency mixer;
Described the second frequency mixer: with the intermediate-freuqncy signal of band pass filter output and the carrier to second order signal multiplication of the second local oscillator generation, intermediate-freuqncy signal is upconverted to radio frequency, signal is given the second low pass filter after the output up-conversion;
Described the second low pass filter: the signal after the up-conversion of the second frequency mixer output is carried out low-pass filtering, and filtering high frequency images component is exported to three-mixer;
The described carrier generator of making an uproar mutually: receive the control information that controller sends, produce the third level carrier signal that meets phase noise model, export to three-mixer;
Described three-mixer: the signal multiplication of the third level carrier signal that the carrier generator of making an uproar is mutually sent and the output of the second low pass filter, signal to the output of the second low pass filter carries out frequency spectrum shift, signal after moving is exported to the 3rd low pass filter, and the signal after moving is identical with simulator input radio frequency signal center frequency;
Described the 3rd low pass filter: the signal after the high frequency images component in the filtering three-mixer output signal, filtering is as the output signal of the described simulator of making an uproar mutually;
Described controller: send control information with the carrier generator of making an uproar mutually to the first local oscillator, set the first order carrier frequency of the first local oscillator output, set the third level carrier frequency of the carrier generator output of making an uproar mutually, set phase noise model and the parameter of the carrier generator of making an uproar mutually, set the inner data source that adopts of the carrier generator of making an uproar mutually.
2. a kind of broadcast communication transmitter according to claim 1 simulator of making an uproar mutually is characterized in that, the carrier to second order signal frequency of described the second local oscillator output is fixed value.
3. a kind of broadcast communication transmitter according to claim 1 simulator of making an uproar mutually is characterized in that the carrier frequency of described three-mixer output signal is identical with the carrier frequency of simulator input signal.
4. a kind of broadcast communication transmitter according to claim 1 simulator of making an uproar mutually, it is characterized in that, the described carrier generator of making an uproar mutually comprises the first Gaussian white noise generator, analog to digital converter, pseudo-random data generator, digital signal processing module, digital to analog converter, the 4th low pass filter;
Described the first Gaussian white noise generator: produce the white Gaussian noise signal, export to analog to digital converter;
Described analog to digital converter: the white Gaussian noise analog signal conversion that Gaussian white noise generator is exported is digital signal, exports to digital signal processing module;
Described pseudo-random data generator: produce the pseudorandom number signal, export to digital signal processing module;
Described digital signal processing module: receive the control information of controller input, control information comprises the frequency of phase noise production model, phase noise model parameter, third level carrier signal, to the selection setting of two-way input signal, after the receiving control information, digital signal processing module is modulated white Gaussian noise signal or the pseudo-random data of input, produces the digital carrier signal that meets phase noise model;
Described digital to analog converter: the digital carrier signal that digital signal processing module is produced is converted to analog signal, exports to the 4th low pass filter;
Described the 4th low pass filter: the high frequency images component in the filtering input analog signal, output is as third level carrier signal.
5. a kind of broadcast communication transmitter according to claim 4 simulator of making an uproar mutually, it is characterized in that, described digital signal processing module comprises the first selector switch, the first multiplication unit, the first adder unit, the first low-pass filter unit, numerical frequency synthesis unit;
Described the first selector switch: the first selector switch receives the instruction of controller, selects the signal of analog to digital converter or the signal of pseudo-random data generator, exports to the first multiplication unit;
Described the first multiplication unit: the first multiplication unit receives the parameter that controller is set, and will multiply each other from signal and the parameter of the first selector switch, and the signal after multiplying each other is exported to the first adder unit;
Described the first adder unit: the first adder unit receives the parameter that controller is set, will be from signal and the parameter addition of the first multiplication unit, and the signal after the addition is exported to the first low-pass filter unit;
Described the first low-pass filter unit: the first low-pass filter unit will carry out low-pass filtering from the signal of the first adder unit, and the signal after the output filtering is to the numerical frequency synthesis unit;
Described numerical frequency synthesis unit: the numerical frequency synthesis unit will be from the signal of the first low-pass filter unit as frequency control word, and output is through the carrier signal after the frequency modulation(FM), as the output signal of digital signal processing module.
6. a kind of broadcast communication transmitter according to claim 4 simulator of making an uproar mutually, it is characterized in that described digital signal processing module comprises the second selector switch, the second multiplication unit, the second low-pass filter unit, the 3rd multiplication unit and numerical frequency synthesis unit;
Described the second selector switch: the second selector switch receives the instruction of controller, selects the signal of analog to digital converter or the signal of pseudo-random data generator, exports to the second multiplication unit;
Described the second multiplication unit: the second multiplication unit receives the parameter that controller is set, and will multiply each other from signal and the parameter of the second selector switch, and the signal after multiplying each other is exported to the second low-pass filter unit;
Described the second low-pass filter unit: the second low-pass filter unit will carry out low-pass filtering from the signal of the second multiplication unit, and the signal after the output filtering is given the 3rd multiplication unit;
Described numerical frequency synthesis unit: the numerical frequency synthesis unit receives the parameter that controller is set, and as frequency control word, the carrier signal of output certain frequency is given the 3rd multiplication unit with this parameter;
Described the 3rd multiplication unit: will multiply each other from the signal of the second low-pass filter unit and the carrier signal of numerical frequency synthesis unit, the signal after the output multiplication is as the output signal of digital signal processing module.
7. the anti-phase noise performance method of testing of communication system comprises the steps:
Step 1, send data by the transimiison analysis instrument to modulator, modulator is modulated data after the frequency conversion, send radio-frequency transmission signals to mixer, the second Gaussian white noise generator output white Gaussian noise signal is to mixer, and mixer is with radio-frequency transmission signals and white Gaussian noise signal plus, and the signal after the output addition is to receiver, the data of output send to the transimiison analysis instrument after the receiver demodulation, measure the white Gaussian noise thresholding of transmission system this moment;
Step 2, set phase noise model and the parameter of the simulator of making an uproar mutually claimed in claim 1, send data by the transimiison analysis instrument to modulator, modulator is modulated data after the frequency conversion, send radio-frequency transmission signals to the simulator of making an uproar mutually, output signal exports mixer to the simulator of making an uproar is mutually sneaked into phase noise in signal transmission after, the second Gaussian white noise generator output white Gaussian noise signal also exports mixer to, mixer will be sneaked into signal and the white Gaussian noise signal plus of phase noise, signal after the addition exports receiver to, the data of output send to the transimiison analysis instrument, the operating state of measuring receiver under this makes an uproar model mutually and the white Gaussian noise thresholding of transmission system after the receiver demodulation;
Step 3, the operating state that comparison step one and step 2 record and the thresholding under the Gaussian white noise channel, the operating state that step 2 and step 1 are recorded and the difference of thresholding are as the ability of anti-this model phase noise of communication system;
Step 4: after a kind of communication system of test, draw the performance of another kind of communication system under same phase noise model, need this communication system is connected with testing equipment according to the step 1 mode of being connected with step 2, the same model of making an uproar mutually is set in the step 2, repeating step one is to step 3, obtain the performance of this communication system under the same model of making an uproar mutually, then relatively the ability of two kinds of anti-phase noises of communication system is good and bad.
8. the anti-phase noise performance method of testing of described a kind of communication system according to claim 7 is characterized in that the centre frequency of the described simulator output signal of making an uproar mutually is identical with modulator output signal centre frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102411722A CN101442368B (en) | 2008-12-26 | 2008-12-26 | Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102411722A CN101442368B (en) | 2008-12-26 | 2008-12-26 | Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101442368A CN101442368A (en) | 2009-05-27 |
| CN101442368B true CN101442368B (en) | 2013-01-30 |
Family
ID=40726639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102411722A Active CN101442368B (en) | 2008-12-26 | 2008-12-26 | Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101442368B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516372A (en) * | 2012-06-21 | 2014-01-15 | 启碁科技股份有限公司 | Radio frequency receiving device |
| CN103326798B (en) * | 2013-06-26 | 2015-06-24 | 惠州市德赛西威汽车电子有限公司 | Test circuit conducting test on performance of products for restraining multi-path signal interference |
| CN106877949A (en) * | 2015-12-11 | 2017-06-20 | 联芯科技有限公司 | The method for extracting the phase noise of local oscillator |
| US10230479B2 (en) * | 2016-07-28 | 2019-03-12 | ETS-Lindgren Inc. | Distributed system for radio frequency environment simulation |
| DE102016115785A1 (en) * | 2016-08-25 | 2018-03-01 | Infineon Technologies Ag | Integrated RF circuit with possibility to test phase noise |
| CN108880719A (en) * | 2017-05-12 | 2018-11-23 | 上海数字电视国家工程研究中心有限公司 | Frequency modulation broadcasting method of real-time |
| CN108880718B (en) * | 2017-05-12 | 2020-06-09 | 上海数字电视国家工程研究中心有限公司 | Frequency modulation broadcast real-time monitoring system, receiver and frequency modulation broadcast real-time monitoring method |
| CN108880705A (en) * | 2017-05-12 | 2018-11-23 | 上海数字电视国家工程研究中心有限公司 | Frequency modulation broadcasting real-time monitoring system |
| CN109412726A (en) * | 2017-08-17 | 2019-03-01 | 上海数字电视国家工程研究中心有限公司 | Receiver |
| CN108563833A (en) * | 2018-03-19 | 2018-09-21 | 西安电子科技大学 | One kind being based on ADS frequency synthesizer phase noise emulation modes and frequency synthesizer |
| CN109471112A (en) * | 2018-10-10 | 2019-03-15 | 浙江大学 | It is a kind of can acoustic resistive wave interference ultrasonic distance-measuring sensor and its distance measuring method |
| CN111181665B (en) * | 2018-11-09 | 2022-02-25 | 国家新闻出版广电总局广播科学研究院 | Method and system for testing performance of amplitude modulation broadcast |
| CN114401175A (en) * | 2021-12-31 | 2022-04-26 | 北京升哲科技有限公司 | Method and device for determining white noise phase variance, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098142A (en) * | 2007-06-14 | 2008-01-02 | 复旦大学 | Frequency synthesizer of multi-sideband OFDM ultra-broadband system radio frequency transceiver |
| CN101136731A (en) * | 2007-08-09 | 2008-03-05 | 复旦大学 | Method for eliminating phase noise using continuous transmission parameter signalling |
| CN101257469A (en) * | 2008-01-11 | 2008-09-03 | 清华大学 | Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system |
-
2008
- 2008-12-26 CN CN2008102411722A patent/CN101442368B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098142A (en) * | 2007-06-14 | 2008-01-02 | 复旦大学 | Frequency synthesizer of multi-sideband OFDM ultra-broadband system radio frequency transceiver |
| CN101136731A (en) * | 2007-08-09 | 2008-03-05 | 复旦大学 | Method for eliminating phase noise using continuous transmission parameter signalling |
| CN101257469A (en) * | 2008-01-11 | 2008-09-03 | 清华大学 | Method for using system information to inhibit phase noise in orthogonal frequency division multiplexing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101442368A (en) | 2009-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101442368B (en) | Phase noise emulator for broadcast communication transmitter and significance testing method capable of resisting phase noise | |
| Halder et al. | Low-cost alternate EVM test for wireless receiver systems | |
| CN102109553B (en) | Digital spectrum analyzer and method for fast positioning of measuring signals | |
| CN110554259B (en) | Integrated vector network analyzer suitable for modulation domain and measurement method | |
| CN104348498B (en) | Adaptive harmonics restraint reception device and method | |
| CN102545959B (en) | Multi-frequency-point broadband signal generator and signal processing method | |
| CN107239611B (en) | Vector signal analysis device and method | |
| CN101378263A (en) | Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method | |
| CN101605005A (en) | Frequency-hopping radio station indicator testing device in half-duplex pilot frequency communication | |
| Breed | Intermodulation Distortion Performance and Measurement Issues | |
| CN111624559A (en) | Electronic countermeasure in-situ test equipment | |
| CN106443122A (en) | Broadband large dynamic signal high-precision measurement device and method | |
| CN204967832U (en) | Jointly disturb system based on frequency spectrum perception and modulation recognition | |
| CN103532643B (en) | Cognition spectrum sensing device and method on basis of DVB-T (Digital Video Broadcasting-Terrestrial) frequency band | |
| CN102624440B (en) | Method for testing satellite mobile communication terminal digital up-converter | |
| CN103809024A (en) | FPGA-based real-time spectral analysis system | |
| CN103067105B (en) | Doppler frequency shift test device, the method for Doppler frequency shift device and communication module | |
| CN101895894B (en) | Method for selecting working channel of dynamic spectrum shared wireless communication system and device thereof | |
| CN108574739A (en) | A kind of radio microphone system control panel based on Web server | |
| CN103684625B (en) | A kind of satellite mobile terminal digital down converter method of testing based on the Big Dipper | |
| Miller et al. | ARMS, an Automated Measurement System for Broadband Modeling of Tx/Rx Devices for High-Fidelity RF Interference Analysis | |
| US9214974B2 (en) | Method for sensing wireless microphones using augmented spectral correlation function | |
| CN204836147U (en) | Ultrashort wave multichannel monitoring radio receiver monitor | |
| Zhang et al. | The design of RF labs using Mini-Circuit modules to improve the quality of teaching in a course on wireless communications and systems | |
| CN110138474A (en) | A kind of zoom-type panorama microwave spectrum monitoring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |