CN109525265A - Broadband measuring device and its method based on lack sampling compensation - Google Patents
Broadband measuring device and its method based on lack sampling compensation Download PDFInfo
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- CN109525265A CN109525265A CN201811155045.0A CN201811155045A CN109525265A CN 109525265 A CN109525265 A CN 109525265A CN 201811155045 A CN201811155045 A CN 201811155045A CN 109525265 A CN109525265 A CN 109525265A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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Abstract
The present invention provides a kind of broadband measuring devices based on lack sampling compensation, including baseband signal processing unit, digital analog converter, upconverting unit, coupler, down-converter unit and analog-digital converter；Baseband signal unit output end is connected with digital analog converter input terminal；The digital analog converter output end is connected with the upconverting unit input terminal；The upconverting unit output end is connected with the input terminal of broadband power amplifier to be measured；The output end of the coupler is connected through attenuator with the input terminal of down-converter unit；The output end of down-converter unit is connected with the input terminal of the analog-digital converter, and the output end of the analog-digital converter is connected with the input terminal of the baseband signal processing unit.The present invention can be reduced to the requirement of analog-digital converter sampling rate, reduce cost.
Description
Technical field
The present invention relates to a kind of nonlinear characteristic extracting method fields of wideband power amplifer, and in particular to one kind is based on
The broadband measuring device and its method of lack sampling compensation.
Background technique
With the fast development of wireless communication technique, the high data transmission rate of current and future wireless communication system demand,
Wideband modulation scheme with high spectrum utilization is widely applied, but produces frequency spectrum in the case of wide-band excitation power amplifier
Extension distortion, as shown in Figure 1.In order to guarantee communication quality, carry out linear compensation non-linear to the broadband of emission system is needed,
Ensure that the linearisation index of emission system meets industry requirement, wherein how effectively to measure and to analyze emission system (mainly wide
Characteristic with power amplifier PA) is the key that carry out linear compensation.In order to obtain the integrity property of output transmitting signal, need
To carry out the demodulation of enough sample rates to broadband power amplifier output signal, under wideband scenarios, the sampling rate that output end needs should
It is 5 times or more of input signal bandwidth.For example, the existing LTE-A signal bandwidth used in the communications, up to 100MHz, measurement end needs
Sampling rate be higher than 500Ms/s.
Experimental analysis majority is analyzed using existing instrument and equipment in research at present, is occurred by random waveform
RF test signal is injected PA by device (arbitrary waveform generatior, AWG), and utilizes Vector Signal Analyzer
(vector signal analyzer, VSA) demodulates PA output signal.Only expensive VSA can satisfy part broadband
Characteristic test problem in the case of signal excitation.Moreover, in some cases, available instrument is unable to satisfy PA linearisation sample
The demand of rate and dynamic range, the bottleneck that the sample rate limitation of feedback control loop becomes contemporary broadband emission system measuring technique are asked
Topic.Therefore, developing a kind of effective broadband emission system measurement method and device has very important scientific meaning and engineering
Application value.
Summary of the invention
The purpose of the present invention is to the defects of the prior art, provide a kind of wide-band width measurement dress based on lack sampling compensation
It sets and its method, can reduce to the requirement of analog-digital converter sampling rate, reduce cost.
The present invention provides a kind of broadband measuring devices based on lack sampling compensation, characterized by comprising:
Baseband signal processing unit, digital analog converter, upconverting unit, coupler, down-converter unit and analog-digital converter；
Baseband signal unit output end is connected with digital analog converter input terminal, and digital analog converter will come from will be at baseband signal
The preprocessed signal of reason unit is changed into analog signal；
The digital analog converter output end is connected with the upconverting unit input terminal, and upconverting unit will be in analog signal
It is converted to desired transmitting frequency range；
The upconverting unit output end is connected with the input terminal of broadband power amplifier to be measured, power amplifier output end in broadband to be measured and institute
The input terminal for stating coupler is connected, and transmitting frequency range is amplified to enough power levels and is concurrently incident upon coupling by broadband power amplifier to be measured
Device；
The output end of the coupler is connected through attenuator with the input terminal of down-converter unit, and the coupling unit of coupler is defeated
Power signal out；For attenuator for controlling down coversion input power, power signal is down-converted to desired intermediate frequency by down coversion list
Frequency range is simultaneously transferred to analog-digital converter；
The output end of down-converter unit is connected with the input terminal of the analog-digital converter, the output end of the analog-digital converter
It is connected with the input terminal of the baseband signal processing unit；Analog-digital converter is sampled and is transmitted to down coversion output RF signal
To baseband signal processing unit.
The baseband signal processing unit includes baseband signal source unit, base-band pre-processing unit, baseband postprocessing list
Member and algorithm execution unit；The baseband signal source unit output end respectively with the base-band pre-processing unit and algorithm
The input terminal of execution unit connects, the connection of digital analog converter input terminal described in the output end of the base-band pre-processing unit,
The input terminal of the baseband postprocessing unit is connect with the AfD converter output, the baseband postprocessing unit
Output end connect with the input terminal of the algorithm execution unit；
The output base band sources of baseband signal source unit are to base-band pre-processing unit, and base-band pre-processing unit is to input base
Band signal source carries out sample delay and synthesis processing, obtains the original test signal of synthesis and exports to digital analog converter；Base band
The down coversion that post-processing unit receives after analog-digital converter sampling exports RF signal, and baseband postprocessing unit exports RF to down coversion
Signal, and the processing such as time alignment, signal reconstruction is carried out to received signal, and signal is input to algorithm process by treated
Unit.
The algorithm execution unit is software execution unit (DSP/FPGA etc.), is based primarily upon the defeated of baseband signal unit
The output signal of signal and baseband postprocessing unit completes signal reconstruction algorithm, PA5 characteristic modeling algorithm, model parameter identification out
Algorithm etc..
Measurement method based on the broadband measuring device based on lack sampling compensation, it is characterised in that including following step
It is rapid:
S1. base-band pre-processing unit is initialized firstly the need of to down-sampled multiple N, then according to the demand pair of N
Original baseband signal carries out (N-1) a postpones signal that sample delay generates baseband signal；Postpones signal and original signal grade
Connection building synthesis test signal；
S2. test signal is after through coupler coupling, attenuator control and down coversion, by adopting with original demands
The low sampling analog-digital converter of sample rate carries out lack sampling, obtains test signal and exports sample, and signal is split, exports N
A sub- signal element；
S3. baseband postprocessing unit reconstructs speedy carding process signal using N number of subsignal of segmentation；
S4. algorithm execution unit utilizes the high sampling rate Output Signal Analysis PA characteristic of original baseband signal and reconstruct.
Compared with the prior art, the advantages of the present invention are as follows by setting baseband signal processing unit, the time is made full use of
Multiplexing technology pre-processes baseband signal and is post-processed, and by the Time Domain Processing of sampled signal, realizes the distortion of broadband power amplifier
The loop either expansion based on digital pre-distortion distortion compensation loop bandwidth is observed, can be effectively reduced to ADC sampling rate
Requirement, efficiently solve the bottleneck problem in the test of broadband distorted signal, while reducing production cost.
Detailed description of the invention
Fig. 1 is that broadband power amplifier exports distorted signal bandwidth distribution schematic diagram；
Fig. 2 is invention's principle block diagram；
Fig. 3 is baseband signal processing unit functional block diagram；
Fig. 4 signal reconstruction process baseband waveform figure (N=2)；
Fig. 5 output signal restructing algorithm functional block diagram.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
As shown in Figure 1, a kind of broadband measuring device based on lack sampling compensation, including baseband signal processing unit 12, number
Mode converter DAC3, upconverting unit 4, broadband power amplifier 5 to be measured, coupler 6, down-converter unit 8 and analog-digital converter ADC9；
12 output end of baseband signal unit is connected with 3 input terminal of digital analog converter, and digital analog converter 3, which will come from, believes base band
The preprocessed signal of number processing unit 12 is changed into analog signal；
3 output end of digital analog converter is connected with 4 input terminal of upconverting unit, and upconverting unit 4 believes simulation
Number upconvert to desired transmitting frequency range；
4 yuan of output ends of the up-conversion list are connected with the input terminal of broadband power amplifier 5 to be measured, power amplifier 5 output end in broadband to be measured
It is connected with the input terminal of the coupler 6, transmitting frequency range is amplified to enough power levels and is concurrently incident upon by broadband power amplifier 5 to be measured
Coupler 6；
The output end of the coupler 6 is connected through attenuator 7 with the input terminal of down-converter unit 8, the coupling part of coupler 6
Divide output power signal, the input coupling unit that output power amplifies, the amplified signal of distortion broadened bandwidth passes through coupler 6
Signal enters feedback control loop；
Attenuator 7 adjusts feedback control loop coupling letter appropriate for controlling down coversion input power, by variable attenuator 7
Number coupled power, control the power level of feedback signal；Power signal is down-converted in desired again and again by down-converter unit 8
Section is simultaneously transferred to analog-digital converter 9；
The output end of down-converter unit 8 is connected with the input terminal of the analog-digital converter 9, is turned by the modulus of low sampling rate
Parallel operation ADC9 carries out the lack sampling sliding-model control of analog signal, obtains analog-digital converter 9 described in the digital signal of lack sampling
Output end is connected with the input terminal of the baseband signal processing unit 12；Analog-digital converter 9 carries out down coversion output RF signal
Baseband signal processing unit is sampled and is transferred to, RF signal enters the rear benefit that baseband signal processing unit 12 carries out digital signal
It repays, realizes the reconstruct of output sampled signal, and carry out the analysis of test power amplifier characteristic.
As shown in Fig. 2, the analysis of baseband signal processing unit 12 compares the base band sources being originally inputted and through above-mentioned module
Amplification output signal that treated.
As shown in figure 3, a kind of wide-band width measurement method and apparatus based on lack sampling compensation, baseband signal processing unit 12
Including baseband signal source unit 1, base-band pre-processing unit 2, baseband postprocessing unit 10 and algorithm execution unit 11.Wherein, base
First output end linker of band signal source unit 1 carries out sample with the input list of pretreatment unit 2, to input base band sources
Delay and synthesis processing, obtain the original test signal of synthesis.The second output terminal join algorithm of baseband signal source unit 1 executes
The output end of unit 11, the input terminal of the output end join algorithm execution unit 11 of baseband postprocessing unit 10.Wherein, algorithm is held
Row unit is the core of baseband signal processing unit, and the core cell of analysis broadband character, mainly includes that signal reconstruction is calculated
The algorithm of the units such as method, PA5 characteristic modeling algorithm, model parameter identification algorithm, signal post-processing reconfiguration unit of the invention is former
It is as shown in Figure 5 to manage block diagram.
Measurement method based on the broadband measuring device based on lack sampling compensation, comprising the following steps:
S1. base-band pre-processing unit is initialized firstly the need of to down-sampled multiple N, then according to the demand pair of N
Original baseband signal carries out (N-1) a postpones signal that sample delay generates baseband signal；Postpones signal and original signal grade
Connection building synthesis test signal；
S2. test signal is after through coupler coupling, attenuator control and down coversion, by adopting with original demands
The low sampling analog-digital converter of sample rate carries out lack sampling, obtains test signal and exports sample, and signal is split, exports N
A sub- signal element；
S3. baseband postprocessing unit reconstructs speedy carding process signal using N number of subsignal of segmentation；
S4. algorithm execution unit utilizes the high sampling rate Output Signal Analysis PA characteristic of original baseband signal and reconstruct.
Case study on implementation: for ease of illustration concrete operations of the invention, the embodiment are directed to signal reconstruction in the case of N=2
Problem of implementation is described in detail.Assuming that the sample rate of original input signal is fs, as shown in fig. 4 a, and original signal is claimed
For the first signal, original input signal is then postponed into a sample and constitutes a new sample sequence, referred to as second signal, and
One new synthetic input signal of composition, which is cascaded, with the first signal sequence utilizes sample rate as shown in Figure 4 bIt is defeated to the synthesis
Enter signal to be sampled, the odd term of available first signal and the even item of second signal, as illustrated in fig. 4 c.Theoretically,
The method of sampling can obtain the complete sequence of signal, but the signal sequence sampled is not ordered into arrangement, occurs between signal
Intersect and overlapping.In order to improve this problem, using multiplexing technique, letter is realized using the sample delay and cascade of signal
The reconstruct of number waveform.Down-sampled (sample rate can be passed through) the high sampled output signal of Accurate Reconstruction in sample, it theoretically can be with
Output signal is obtained in high sampling rate (sample rate fs) in the case of reconstruction signal of equal value, as shown in figure 4d.But in reality
Under applicable cases, even the excitation of identical signal, due to the measurement noise and system noise of this province of observation device, acquisition
Signal is also impossible to identical, but the interference of this noise disturbance will not influence the analysis of broadband PA5 characteristic.Due in reality
Signal during the PA characteristic test on border mainly using finite length (being under normal circumstances several milliseconds) is sent out by signal
Raw device carries out loop play, carries out excitation analysis, this point ensure that the correctness of dividing method of the present invention.Moreover, of the invention
It is split in the sub-block cutting procedure for carrying out output signal using single sample as delay time unit, to test function
The characteristic put does not influence.
In order to better illustrate the specific implementation process of present case, consider that a signal waveform sample point is the original of K=6
Signal is f in sample ratesIn the case of available K × 1 vector, be expressed as
X=[x (1) x (2) x (3) x (4) x (5) x (6)] (1)
In the case where N=2, the test signal of synthesis is f in sample ratesIn the case where can obtain NK × 1
Vector is
xsyn=[x (1) ... x (6) x (2) ... x (6) x (1)] (2)
Then it is using sample frequency in output endCarry out one vector of K × 1 of down-sampled acquisition, output signal when N=2
Down-sampled signal be
yundersampled=[y (1) y (3) y (5) y (2) y (4) y (6)] (3)
Then reconstruct can be obtained by being multiplexed first three sample signal (K/N=3) and last three sample signals
High sampled output signal is
yrec=[y (1) y (2) y (3) y (4) y (5) y (6)] (4)
So far, signal reconstruction is realized, subsequent to carry out complete power amplifier characteristic modeling and analysis.
DAC, upconverting unit, coupler, attenuator, down-converter unit and ADC in the present invention can be using existing
Some mature technologies.Finally it is emphasized that above specific implementation step is primarily used to illustrate realization of the invention
Journey, rather than the limitation to the invention concrete application field.Any broadband test device based on the structure cannot be detached from this
The spirit and scope of invention should be included within the scope of the claims of the present invention.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (4)
1. a kind of broadband measuring device based on lack sampling compensation, characterized by comprising:
Baseband signal processing unit, digital analog converter, upconverting unit, coupler, down-converter unit and analog-digital converter；
Baseband signal unit output end is connected with digital analog converter input terminal, and digital analog converter will come from base band signal process list
The preprocessed signal of member is changed into analog signal；
The digital analog converter output end is connected with the upconverting unit input terminal, and upconverting unit is by analog signal up-conversion
To desired transmitting frequency range；
The upconverting unit output end is connected with the input terminal of broadband power amplifier to be measured, power amplifier output end in broadband to be measured and the coupling
The input terminal of clutch is connected, and transmitting frequency range is amplified to enough power levels and is concurrently incident upon coupler by broadband power amplifier to be measured；
The output end of the coupler is connected through attenuator with the input terminal of down-converter unit, the coupling unit output work of coupler
Rate signal；For attenuator for controlling down coversion input power, power signal is down-converted to desired intermediate-frequency band by down coversion list
And it is transferred to analog-digital converter；
The output end of down-converter unit is connected with the input terminal of the analog-digital converter, the output end of the analog-digital converter and institute
The input terminal for stating baseband signal processing unit is connected；Analog-digital converter samples down coversion output RF signal and is transferred to base
Band signal processing unit.
2. the broadband measuring device according to claim 1 based on lack sampling compensation, it is characterised in that:
The baseband signal processing unit include baseband signal source unit, base-band pre-processing unit, baseband postprocessing unit with
And algorithm execution unit；The baseband signal source unit output end is executed with the base-band pre-processing unit and algorithm respectively
The input terminal of unit connects, the connection of digital analog converter input terminal described in the output end of the base-band pre-processing unit, described
The input terminal of baseband postprocessing unit connect with the AfD converter output, the baseband postprocessing unit it is defeated
Outlet is connect with the input terminal of the algorithm execution unit；
The output base band sources of baseband signal source unit are to base-band pre-processing unit, and base-band pre-processing unit is to input base band letter
Number source carries out sample delay and synthesis processing, obtains the original test signal of synthesis and exports to digital analog converter；After base band
It manages unit and receives the down coversion output RF signal after analog-digital converter sampling, and time alignment, signal are carried out to received signal
The processing such as reconstruct, and signal is input to algorithm process unit by treated.
3. the broadband measuring device according to claim 2 based on lack sampling compensation, it is characterised in that:
The algorithm execution unit is software execution unit, after being based primarily upon the output signal and base band of baseband signal unit
The output signal for managing unit completes signal reconstruction algorithm, PA5 characteristic modeling algorithm, model parameter identification algorithm.
4. the measurement method based on the broadband measuring device described in claim 1 based on lack sampling compensation, it is characterised in that packet
Include following steps:
S1. base-band pre-processing unit is initialized firstly the need of to down-sampled multiple N, then according to the demand of N to original
Baseband signal carry out sample delay generate baseband signal (N-1) a postpones signal；Postpones signal and original signal cascade structure
Build synthesis test signal；
S2. test signal is after through coupler coupling, attenuator control and down coversion, by with original demands sample rateLow sampling analog-digital converter carry out lack sampling, obtain test signal and export sample, and signal is split, is exported N number of
Subsignal unit；
S3. baseband postprocessing unit reconstructs speedy carding process signal using N number of subsignal of segmentation；
S4. algorithm execution unit utilizes the high sampling rate Output Signal Analysis PA characteristic of original baseband signal and reconstruct.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110647208A (en) * | 2019-09-26 | 2020-01-03 | 中国科学院微电子研究所 | Signal generating device |
| CN112468222A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院微小卫星创新研究院 | Environmental channel simulation system and method |
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| CN102969987A (en) * | 2012-12-17 | 2013-03-13 | 东南大学 | Undersampling-based broadband power-amplifier pre-distortion method |
| CN104301269A (en) * | 2014-10-27 | 2015-01-21 | 成都师范学院 | Equivalent sampling predistortion system and method |
| CN107592083A (en) * | 2017-09-07 | 2018-01-16 | 东南大学 | The digital pre-distortion system and its method of millimeter wave broadband power amplifier |
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| WO2009098641A1 (en) * | 2008-02-06 | 2009-08-13 | Nxp B.V. | Signal converter |
| CN102969987A (en) * | 2012-12-17 | 2013-03-13 | 东南大学 | Undersampling-based broadband power-amplifier pre-distortion method |
| CN104301269A (en) * | 2014-10-27 | 2015-01-21 | 成都师范学院 | Equivalent sampling predistortion system and method |
| CN107592083A (en) * | 2017-09-07 | 2018-01-16 | 东南大学 | The digital pre-distortion system and its method of millimeter wave broadband power amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110647208A (en) * | 2019-09-26 | 2020-01-03 | 中国科学院微电子研究所 | Signal generating device |
| CN112468222A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院微小卫星创新研究院 | Environmental channel simulation system and method |
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