CN1545257A - System and method for frequency range segregation and signal synthesis in broadband signal measurement - Google Patents
System and method for frequency range segregation and signal synthesis in broadband signal measurement Download PDFInfo
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- CN1545257A CN1545257A CNA2003101133996A CN200310113399A CN1545257A CN 1545257 A CN1545257 A CN 1545257A CN A2003101133996 A CNA2003101133996 A CN A2003101133996A CN 200310113399 A CN200310113399 A CN 200310113399A CN 1545257 A CN1545257 A CN 1545257A
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Abstract
The invention provides a frequency range separating and signal synthesizing system and method for broadband signal measurement, including front-end power amplifying and distributing unit, multifrequency range synchronous sampling unit, signal synthesizing unit and secondary signal balancing unit; firstly using the front-end power amplifying and distributing unit to distribute the received frequency band signal to each subchannel in the above sampling unit, making multiple frequency transformation on broadband signals in different frequency ranges and then using many A/D converters for sampling, then using the signal synthesizing unit to superpose the sampled signals of all the subchannels together to recover a broadband digital. It uses many low-speed A/D converters to achieve the effect of high-speed A/D converter, accordingly implementing a low-cost, high-speed and high-precision broadband signal measurement.
Description
Technical field
The present invention relates to a kind of technology that in the broadband signal measuring technique, adopts, refer to especially a kind of with broadband analog signal be converted to wideband digital signal method and system.
Background technology
At present, the just former speed that does not have of digital communication industry in the whole world advances, as: look the television broadcasting of audio frequency etc. based on the IP network communication of transmission data, based on the various fixing and mobile phone communications of transmission voice, based on transmission.Along with digital communication and people's life are got in touch more and more closelyr, the reliability of these digital communications networks is also had higher requirement.This operator that just needs digital communications network often carries out comprehensively, effectively detects network communication quality, finds network failure immediately, adjusts, and guarantees the quality of network service.
The digital communication signal device for testing and analyzing is exactly to come network quality is monitored device with error detection by the various parameters of signal in the test analysis digital communication.Nearly all network operation commercial city need obtain the information of network communication quality by its help, and therefore, the application of digital communication vector signal device for testing and analyzing is very extensive.
According to existing technical merit, the measurement that present digital signal test analytical instrument carries out the broadband needs very expensive equipment, and all can not satisfy broadband and high-precision measurement requirement now.As follows with regard to the existing existing case study of digital signal test analytical instrument below:
For the digital signal of testing broad-band, high speed, the speed of required A/D converter should be 2～3 times of signal bandwidth, therefore needs broadband, A/D converter at a high speed.Existing digital signal tester adopts the relatively cheap low-speed a/d converter of price more, therefore also can only test the digital signal of finite bandwidth, limited precision.If adopt A/D converter at a high speed that wideband data is sampled, not only price is very expensive, and along with the raising of speed, the precision of A/D converter descends gradually, brings certain limitation to measurement effect.For broadband, at a high speed digital signal, if signal bandwidth surpasses 2 times of speed of A/D converter then can't test.
Summary of the invention
Therefore, the technical problem to be solved in the present invention provides a kind of method that broadband signal is measured, and can realize broadband signal low cost, two-forty, high-precision measurement; Another technical problem that the present invention will solve provides and a kind ofly can realize system for carrying out said process.
In order to achieve the above object, the invention provides band separation and signal synthesis method in a kind of broadband signal measurement, it is characterized in that may further comprise the steps: the broadband signal that receives is carried out band separation; The signal of the different frequency range separated is sent into each subchannel respectively, carry out frequency conversion and synchronized sampling, and sampled signal is carried out channel equalization; Sampled signal with the output of each subchannel is superimposed by frequency then, and the digital signal of each arrowband is reduced into wideband digital signal.
In the said method, can comprise that also one is carried out channel equalization to described wideband digital signal after synthetic, with the step of the deficiency that remedies frequency equilibrium.
In the said method, described each subchannel adopts A/D converter that the signal of different frequency range is carried out synchronized sampling, and is controlled by the synchronizing signal of sampling clock generator output.
In the said method, when carrying out channel equalization, all can adopt training sequence and demarcation automatically.
In the said method, when in described subchannel, frequency band signals being carried out frequency conversion, can be earlier the power of frequency band signals be replenished, then this frequency band signals is transformed to first intermediate frequency, and leach the signal of this frequency range, pass through frequency conversion for the second time again, with this frequency band signals be converted to be fit to the A/D converter input than Low Medium Frequency, disturb outward through the further filtering band of second intermediate-frequency filter again.
The present invention also provides band separation and the signal synthesis system that realizes said method, comprising: front end power amplifying allocation units, the broadband signal frequency division that is used for that it is received are to export behind the signal of a plurality of different frequency ranges; Multiband synchronized sampling unit comprises a plurality of subchannels that receive described a plurality of frequency range output signals respectively, after frequency band signals is carried out frequency conversion, carries out synchronized sampling and channel equalization again; Signal synthesis unit is used for the sampled signal of described a plurality of subchannels output is superimposed by frequency, and the digital signal of each arrowband is reduced into wideband digital signal.
In the said system, also can comprise the secondary singal balanced unit, be used for synthetic wideband digital signal is carried out channel equalization, to remedy the deficiency of frequency equilibrium.
In the said system, the structure of each subchannel of described multiband synchronized sampling unit can comprise: variable frequency synthesiser circuit, the frequency band signals that is used for being received be converted to be fit to the A/D converter input than Low Medium Frequency; A/D converter is used for the frequency band signals of its reception is carried out synchronized sampling; The frequency range equalizer, the signal after each the frequency range sampling that is used for it is received carries out adaptive equalization, to eliminate the influence that the subchannel transmission function error produces; Described multiband synchronized sampling unit also comprises a sampling clock generator, is used for synchronised clock control is carried out in the sampling of each subchannel A/D converter.
In the said system, described variable frequency synthesiser circuit can comprise: prime amplifier, and the power that is used for frequency band signals that it is received replenishes; Tuner with this frequency range centre frequency changes to first intermediate frequency with the prime amplifier output signal; First intermediate-frequency filter, the output signal of receiver turning is used to leach the signal of this frequency range; The double conversion device, be used for output signal with first intermediate-frequency filter be converted to be fit to the A/D converter input than Low Medium Frequency; Second intermediate-frequency filter, the output signal of reception double conversion device further leaches the outer interference of band.Described variable frequency synthesiser circuit can also comprise No. three frequency converters and the 3rd filter, is used to receive the output signal of second intermediate-frequency filter, carries out exporting after single-conversion and the filtering again.
In the said system, also can comprise the automatic calibration system that has the demarcation signal generator and demarcate the unit automatically, described secondary singal balanced unit and described frequency range equalizer are plural equalizer, receive the different training sequence that described demarcation signal generator produces respectively, utilize its frequency spectrum to come the frequency response of correction channel, also receive the different time domain signal that described automatic demarcation unit produces simultaneously respectively, with the time-domain response of corrective system.
The method and system that band separation of the present invention and signal are synthetic have solved the problem that conventional digital communication vector signal test analytical instrument is measured wideband digital signal effectively, and the advantage of solution is as follows:
Adopt repeatedly frequency conversion, solved signal aliasing effectively and the adaptive problem of the interface of A/D converter;
Adopt a plurality of A/D converters,, respectively the narrow band signal of a plurality of frequency ranges is sampled by the control of a synchronized sampling clock.To carry out signal at frequency domain synthetic for the narrow band signal of the different frequency range that these synchronized samplings are obtained then, promptly obtains the multi-frequency-band digital signal in broadband.The synthetic method of this band separation and signal is used a plurality of A/D converters, has not only reduced the design cost of tester, and can obtain high-precision wideband digital signal measurement result;
The data that each A/D converter sampling obtains are carried out adaptive channel equalizer respectively, guarantee that the transfer function of channel is undistorted;
Synthetic result afterwards carries out the adaptive equalization second time to signal, remedies the flatness of transfer function in the signal building-up process;
To the synthetic forward and backward broadband training sequence (training sequence) that designs respectively of signal, allow adaptive equalizer reach convergence as soon as possible, finish equilibrium;
Adopted automatic calibrating function.Demarcation signal with time domain and frequency domain is automatically demarcated instrument, corrects gain error and the sub-channel frequencies response error in adopting Digital Signal Processing.
Description of drawings
Fig. 1 is the schematic diagram of the inventive method;
Fig. 2 is the system architecture diagram of the embodiment of the invention;
Fig. 3 is the structured flowchart of the variable frequency synthesiser circuit of the embodiment of the invention;
Fig. 4 is the multiband synchronized sampling schematic diagram of the embodiment of the invention;
Fig. 5 is the synthetic preceding schematic diagram of embodiment of the invention signal;
Fig. 6 is the schematic diagram after embodiment of the invention signal synthesizes;
Fig. 7 is desirable amplitude-frequency characteristic figure after the equilibrium of embodiment of the invention secondary;
Fig. 8 is desirable phase-frequency characteristic figure after the equilibrium of embodiment of the invention secondary.
Embodiment
The present invention has adopted technology such as unique repeatedly frequency conversion, many A/D converters synchronized sampling, channel equalization, and it is synthetic to finish signal, to realize wideband digital signal low cost, two-forty, high-precision measurement.
The step and the system configuration of the inventive method are described below in conjunction with Fig. 1 and Fig. 2.
At first, tested broadband signal enters front end power amplifying allocation units 1, broadband rf signal is carried out power amplification and power division (step 100), the signal of the different frequency range that is separated is redistributed to each subchannel in the multiband synchronized sampling unit 2, in each subchannel, carry out frequency conversion, synchronized sampling and channel equalization (step 110), signal after then each frequency range of each subchannel output is sampled entering signal synthesis unit 3 together carries out frequency synthesis (step 120), be about to each frequency range equilibrium sampled signal afterwards and be superimposed, realize the digital signal of each arrowband is reduced into wideband digital signal by frequency; Owing to carry out signal when synthetic, signal between each frequency range has overlapping or transition on frequency band, cause synthetic signal not too consistent with original actual wideband digital signal, lack flatness, therefore after finish signal and synthesizing, again the signal of output is sent into secondary singal balanced unit 4, synthetic wideband digital signal is carried out channel equalization, to remedy the deficiency (step 130) of frequency equilibrium; The synthetic at last and balanced wideband digital signal of process is admitted to digital signal processor (DSP) and carries out further Digital Signal Processing, to finish the test of various parameters.
Above-mentioned multiband synchronized sampling unit 1 adopts the multiband sub-channel structure, its each subchannel concrete structure as shown in Figure 2, each frequency band signals that is separated at first enters variable frequency synthesiser circuit 21, with the signal that is received repeatedly be converted to be fit to the A/D converter input than Low Medium Frequency, send into A/D converter 22 then, under the control of the synchronizing signal that sampling clock generator 24 is exported, 22 pairs of A/D converting units in each subchannel input signal of frequency range are separately carried out synchronous sampling with high precision, signal after the sampling enters frequency range equalizer 23 again, signal after each frequency range sampling is carried out adaptive equalization respectively, to eliminate the influence that the subchannel transmission function error produces, prevent to cause after signal is synthetic, the channel distortion mutual superposition, the phenomenon that can't remove.Thereby finally finished the synchronized sampling of multiband.
Above-mentioned variable frequency synthesiser circuit 21 is analog demodulator systems, its concrete structure as shown in Figure 3, broadband rf signal from the power amplifying allocation units is introduced into prime amplifier 211, power to its received signal replenishes, enter tuner 212 then with this frequency range centre frequency, this broadband signal is changed to first intermediate frequency, then enter first intermediate-frequency filter 213, leach the signal of this frequency range, enter double conversion device 214 afterwards, with this frequency band signals be converted to be fit to the A/D converter input than Low Medium Frequency, enter second intermediate-frequency filter 215 at last, leach further that band is outer to be disturbed.When the frequency of frequency range is higher, also can add frequency conversion for the third time.
Above-mentioned all equalizers can select corresponding training sequence that adaptive equalizer is restrained fast, and training sequence is produced by demarcation signal generator 51; System calibrating is responsible for finishing by calibration system 5.
Below again technology contents of the present invention is described in detail.
The multiband synchronous sampling technique, the present invention adopts the control of same sampling clock corresponding to each band A/D transducer, makes them can be simultaneously carry out digital sample to the signal of each frequency range, has enlarged the frequency range of sampling.On the other hand, promptly be the effect that is equivalent to reach high-speed a/d converter with the A/D converter of low speed, significantly reduced cost.Simultaneously, because the time low speed A/D that adopts, the precision of sampling also just is guaranteed.Fig. 4 is the signal of multiband synchronized sampling.
The signal synthetic technology, after the multiband synchronized sampling, the signal on each road still is the digital signal of arrowband.Therefore need carry out the synthetic multi-frequency-band digital signal that could form the broadband of signal.The synthetic front and back signal of the sampled signal of a plurality of frequency ranges on frequency spectrum as shown in Figure 5 and Figure 6.
The secondary balancing technique, the characteristics that the present invention is synthetic according to signal in the case of necessary, are carried out the secondary equilibrium, and frequency is further compensated.The present invention has used the secondary broadband equalization, is to be used for further compensating test instrument channel distortion and the outer channel distortion of tester; In addition, for the first time channel equalization and the synthetic equilibrium of signal for the second time, the present invention has adopted training sequence (training sequence) and has demarcated automatically.Different training sequences produces the frequency response that different frequency spectrums comes correction channel; Automatically demarcate unit 52 and produce the time-domain response that different time-domain signals comes corrective system, proofread and correct and adopt step function, slope function to come other the parameter to time-sensitive of rise time, fall time and some is carried out.Measure.
The equalizer that twice equilibrium adopted is plural equalizer, and last balanced result need reach smooth as shown in Figure 6 and Figure 7 amplitude-frequency characteristic and phase-frequency characteristic.
Claims (11)
1, band separation and signal synthesis system during a kind of broadband signal is measured is characterized in that, comprising:
Front end power amplifying allocation units, the broadband signal frequency division that is used for that it is received are the signal output of a plurality of different frequency ranges;
Multiband synchronized sampling unit comprises a plurality of subchannels that receive described different frequency range output signal respectively, after frequency band signals is carried out frequency conversion, carries out synchronized sampling and channel equalization again;
Signal synthesis unit is used for the sampled signal of described a plurality of subchannels output is superimposed by frequency, and the digital signal of each arrowband is reduced into wideband digital signal.
2, band separation and the automatic synthesis system of signal during broadband signal as claimed in claim 1 is measured is characterized in that, also comprise the secondary singal balanced unit, are used for synthetic wideband digital signal is carried out channel equalization, to remedy the deficiency of frequency equilibrium.
3, band separation and signal synthesis system during broadband signal as claimed in claim 1 or 2 is measured is characterized in that the structure of each subchannel of described multiband synchronized sampling unit comprises:
Variable frequency synthesiser circuit, the frequency band signals that is used for being received be converted to be fit to the A/D converter input than Low Medium Frequency;
A/D converter is used for the frequency band signals of its reception is carried out synchronized sampling;
The frequency range equalizer, the signal after each the frequency range sampling that is used for it is received carries out adaptive equalization, to eliminate the influence that the subchannel transmission function error produces;
Described multiband synchronized sampling unit also comprises a sampling clock generator, is used for synchronised clock control is carried out in the sampling of each subchannel A/D converter.
4, band separation and signal synthesis system during broadband signal as claimed in claim 3 is measured is characterized in that described variable frequency synthesiser circuit comprises:
Prime amplifier, the power that is used for frequency band signals that it is received replenishes;
Tuner with this frequency range centre frequency changes to first intermediate frequency with the prime amplifier output signal;
First intermediate-frequency filter, the output signal of receiver turning is used to leach the signal of this frequency range;
The double conversion device, be used for output signal with first intermediate-frequency filter be converted to be fit to the A/D converter input than Low Medium Frequency;
Second intermediate-frequency filter, the output signal of reception double conversion device further leaches the outer interference of band.
5, band separation and signal synthesis system during broadband signal as claimed in claim 4 is measured, it is characterized in that, described variable frequency synthesiser circuit also comprises No. three frequency converters and the 3rd filter, is used to receive the output signal of second intermediate-frequency filter, carries out exporting after single-conversion and the filtering again.
6, band separation and signal synthesis system during broadband signal as claimed in claim 3 is measured, it is characterized in that, also comprise the automatic calibration system that has the demarcation signal generator and demarcate the unit automatically, described secondary singal balanced unit and described frequency range equalizer are plural equalizer, receive the different training sequence that described demarcation signal generator produces respectively, utilize its frequency spectrum to come the frequency response of correction channel, also receive the different time domain signal that described automatic demarcation unit produces simultaneously respectively, with the time-domain response of corrective system.
7, band separation and signal synthesis method during a kind of broadband signal is measured is characterized in that, may further comprise the steps:
The broadband signal that receives is carried out band separation;
The signal of the different frequency range separated is sent into each subchannel respectively, carry out frequency conversion and synchronized sampling, and sampled signal is carried out channel equalization;
The sampled signal of each subchannel output is superimposed by frequency, the digital signal of each arrowband is reduced into wideband digital signal.
8, band separation and signal synthesis method during broadband signal as claimed in claim 7 is measured is characterized in that, comprise that also one is carried out channel equalization to described wideband digital signal after synthetic, with the step of the deficiency that remedies frequency equilibrium.
9, as band separation and signal synthesis method in claim 7 or the 8 described broadband signals measurements, it is characterized in that, described each subchannel adopts A/D converter that the signal of different frequency range is carried out synchronized sampling, and is controlled by the synchronizing signal of sampling clock generator output.
10, as band separation and signal synthesis method in claim 7 or the 8 described broadband signals measurements, it is characterized in that, all adopted training sequence and demarcation automatically when carrying out channel equalization.
11, band separation and signal synthesis method during broadband signal as claimed in claim 7 is measured, it is characterized in that, when in described subchannel, frequency band signals being carried out frequency conversion, power to frequency band signals replenishes earlier, then this frequency band signals is transformed to first intermediate frequency, and leach the signal of this frequency range, pass through frequency conversion for the second time again, with this frequency band signals be converted to be fit to the A/D converter input than Low Medium Frequency, disturb outward through the further filtering band of second intermediate-frequency filter again.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160882A (en) * | 2016-07-13 | 2016-11-23 | 北京交通大学 | A kind of multiband wireless channel measurement calibration steps and system |
| CN106301629A (en) * | 2015-06-12 | 2017-01-04 | 中兴通讯股份有限公司 | Broadband multi-band signal detecting method and device and wireless communication system |
| CN107015063A (en) * | 2017-03-21 | 2017-08-04 | 中国科学院国家天文台 | Wide band multi-channel Correlation receiver and method of reseptance |
| CN109752603A (en) * | 2018-12-10 | 2019-05-14 | 兰州空间技术物理研究所 | A kind of synchronized sampling unit of space electric field survey meter |
| CN115902380A (en) * | 2023-03-08 | 2023-04-04 | 保定天威新域科技发展有限公司 | Ultra-wideband current intelligent sensor |
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2003
- 2003-11-18 CN CNA2003101133996A patent/CN1545257A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301629A (en) * | 2015-06-12 | 2017-01-04 | 中兴通讯股份有限公司 | Broadband multi-band signal detecting method and device and wireless communication system |
| CN106160882A (en) * | 2016-07-13 | 2016-11-23 | 北京交通大学 | A kind of multiband wireless channel measurement calibration steps and system |
| CN106160882B (en) * | 2016-07-13 | 2018-05-15 | 北京交通大学 | A kind of multiband wireless channel measurement calibration method and system |
| CN107015063A (en) * | 2017-03-21 | 2017-08-04 | 中国科学院国家天文台 | Wide band multi-channel Correlation receiver and method of reseptance |
| CN109752603A (en) * | 2018-12-10 | 2019-05-14 | 兰州空间技术物理研究所 | A kind of synchronized sampling unit of space electric field survey meter |
| CN109752603B (en) * | 2018-12-10 | 2021-02-19 | 兰州空间技术物理研究所 | Synchronous sampling device of space electric field detector |
| CN115902380A (en) * | 2023-03-08 | 2023-04-04 | 保定天威新域科技发展有限公司 | Ultra-wideband current intelligent sensor |
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