CN104270208B - Method and device for detecting standing-wave ratio of RRU - Google Patents
Method and device for detecting standing-wave ratio of RRU Download PDFInfo
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Abstract
The invention provides a method and device for detecting the standing-wave ratio of an RRU. Calibration data are stored in the RRU. The method includes the steps that swept-frequency signals are generated; the swept-frequency signals are sent to equipment to be detected through a preset training sequence; the RRU is adopted for capturing RPD feedback data and OPD feedback data of the equipment to be detected; reflection parameters are calculated according to the RPD feedback data and the OPD feedback data; by the adoption of the reflection parameters and the calibration data in the RRU, accurate reflection coefficients are calculated; the accurate reflection coefficients are adopted for calculating an average reflection coefficient in a designated bandwidth; the standing-wave ratio is calculated through the average reflection coefficient. The method and device are used for accurately detecting the standing-wave ratio of the RRU.
Description
Technical field
The present invention relates to shift measurement technical field, particularly relate to the side of a kind of remote radio unit (RRU) RRU standing-wave ratio detection
Method, and, the device of a kind of remote radio unit (RRU) RRU standing-wave ratio detection.
Background technology
The most popular current base station system architectures mainly have employed distributed frame, be by RRU (Remote Radio
Unit, remote radio unit (RRU)) and BBU (Building Base band Unit, indoor baseband processing unit) composition.Base station is
One important function of system framework is exactly to realize the detection of system standing-wave ratio, and standing-wave ratio is to measure a finger of reflective properties
Mark.SWR (Standard Wave Ratio, standing-wave ratio)/VSWR (Voltage Standing Wave Ratio, voltage standing wave(VSW)
Than) refer to each antenna channels of RRU is detected, thus measure the standing wave value of each antenna port obtaining RRU, thus in time
Know that the matching state of antenna port, standing-wave ratio detection mainly include that OPD (Output Power Detector, examine by output
Survey) and RPD (Return Power Detector, reflection power detects).
If base station system standing-wave ratio is bigger than normal, it is unable to accurately detect, RF (Radio Frequency can be caused
Signal, radiofrequency signal) poured in down a chimney the prevention at radio-frequency port into RRU by antenna port, cause the power amplifier PA (power in RRU
Amplifier, power amplifier) etc. the phenomenon burnt of device.
Therefore, one of problem that those skilled in the art are in the urgent need to address is, proposes a kind of remote radio unit (RRU) RRU
The method and device of standing-wave ratio detection, in order to accurately to detect the standing-wave ratio of RRU.
Summary of the invention
The technical problem to be solved is to provide method and the dress of a kind of remote radio unit (RRU) RRU standing-wave ratio detection
Put, in order to accurately to detect the standing-wave ratio of RRU.
In order to solve the problems referred to above, the method that the invention discloses the detection of a kind of remote radio unit (RRU) RRU standing-wave ratio, described
In RRU, storage has calibration data, described method to include:
Generate swept-frequency signal；
Preset training sequence is used to launch described swept-frequency signal to Devices to test；
Described RRU is used to capture reflection power detection RPD feedback data and the output detection OPD of described Devices to test
Feedback data；
Reflection parameters is calculated according to described reflection power detection RPD feedback data and output detection OPD feedback data；
The calibration data in described reflection parameters and described RRU is used to calculate accurate reflection coefficient；
Use the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth；
Described average reflection coefficient is used to calculate standing-wave ratio.
Preferably, described calibration data includes directional error D, skin tracking error R, and source mismatch error S, described school
Quasi-data obtain in the following way:
Preset training sequence is used to launch described swept-frequency signal to Devices to test；
The reflection power detection RPD that employing RRU captures the described Devices to test when short circuit, open circuit, load matched respectively is anti-
Feedback data；
Use the described reflection power detection RPD feedback data meter of described Devices to test when short circuit, open circuit, load matched
Calculate described directional error D, skin tracking error R, and source mismatch error S.
Preferably, described according to described reflection power detection RPD feedback data and output detection OPD feedback data meter
The step calculating reflection parameters includes:
Use described output detection OPD feedback data that described reflection power detection RPD feedback data is carried out phase place
Simultaneously operating；
Segmentation from each preset resident frequency after described Phase synchronization reflection power detection RPD feedback data carry
Take tone signal；
Peak-peak is obtained according to described tone signal；
Use described peak-peak and calculate reflection parameters.
Preferably, the described step according to described tone signal acquisition peak-peak includes:
Described tone signal is carried out fast Fourier transform FFT and obtains frequency domain character figure；
The peak-peak in nominated bandwidth is calculated from described frequency domain character figure.
Preferably, described Devices to test is antenna.
The embodiment of the invention also discloses the device of a kind of remote radio unit (RRU) RRU standing-wave ratio detection, described RRU stores
Calibration data, described device is had to include:
Generation module, is used for generating swept-frequency signal；
First transmitter module, for using preset training sequence to launch described swept-frequency signal to Devices to test；
First handling module, for using described RRU to capture the reflection power detection RPD feedback data of described Devices to test
And output detection OPD feedback data；
First computing module, for according to described reflection power detection RPD feedback data and output detection OPD feedback
Data calculate reflection parameters；
Second computing module, for using the calibration data in described reflection parameters and described RRU to calculate accurate reflection system
Number；
3rd computing module, the average reflection coefficient in using described accurate reflection coefficient calculations nominated bandwidth；
4th computing module, is used for using described average reflection coefficient to calculate standing-wave ratio.
Preferably, described calibration data includes directional error D, skin tracking error R, and source mismatch error S, described dress
Put and also include:
Second transmitter module, for using preset training sequence to launch described swept-frequency signal to Devices to test；
Second handling module, for using RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively
Reflection power detection RPD feedback data；
5th computing module, for using the described reflection power of described Devices to test when short circuit, open circuit, load matched
Detection RPD feedback data calculates described directional error D, skin tracking error R, and source mismatch error S.
Preferably, described first computing module includes:
Calibration submodule, is used for using described output detection OPD feedback data anti-to described reflection power detection RPD
Feedback data carry out Phase synchronization operation；
Segmentation captures submodule, for segmentation from each preset resident frequency reflection power after described Phase synchronization
Detection RPD feedback data extracts tone signal；
Peak value obtains submodule, for obtaining peak-peak according to described tone signal；
Reflection parameters calculating sub module, is used for using described peak-peak and calculating reflection parameters.
Preferably, described peak value acquisition submodule includes:
Converter unit, obtains frequency domain character figure for described tone signal carries out fast Fourier transform FFT；
Peak computational unit, for calculating the peak-peak in nominated bandwidth from described frequency domain character figure.
Preferably, described Devices to test is antenna.
Compared with background technology, the embodiment of the present invention includes advantages below:
Single port calibration method and frequency domain reflection measurement technology are combined, based on vector calibration technology by the embodiment of the present invention
Carry out standing-wave ratio detection, by sending swept-frequency signal, then obtain and calculate multiple relevant parameter and calibration data can be accurately
Calculate standing-wave ratio.Enable the understanding current device standing-wave ratio situation that base station equipment management personnel are the most real-time, contribute to dimension
Protect the service behaviour of base station system, preferably prevent the base station equipment of costliness from situation about damaging occurring.
The embodiment of the present invention uses the mode generating and utilizing base band swept-frequency signal, uses TD base station system to launch training
The mode of sequence, can eliminate intersymbol interference to a certain extent, can greatly reduce amount of calculation simultaneously.The amplitude of swept-frequency signal
Standard can be adjusted correspondingly as desired, can be adjusted to A in embodiments of the present invention.
The embodiment of the present invention needs capture the output detection OPD feedback data of RRU and reflection power inspection simultaneously
Survey RPD feedback data, data are calibrated accordingly interference operation, thereby guarantees that the accuracy that standing-wave ratio detects, accurately
Reflection RRU system in the duty of each nonlinear device.
Single port collimation technique is applied to RRU system by the embodiment of the present invention, and the calibration data calculated can be existed
RRU internal system stores, and conveniently applies the most at any time, and measurement efficiency is substantially improved, and reduces and measures cost every time.
The embodiment of the present invention carries out the mechanism of synchroballistic process for feedback signal OPD collected and RPD, with
This ensures the time delay in OPD and RPD feedback data time and phase place.
In the embodiment of the present invention, standing-wave ratio detecting method may utilize computer program and realizes, and is applied to base station system
System, it is not necessary to increase extra hardware cost, it is only necessary to utilize a small amount of DSP of base station system to calculate resource, and storage resource,
Just feasible system accurate standing-wave ratio detection function.
Accompanying drawing explanation
Fig. 1 is the structure chart of a kind of base station far-end radio frequency unit RRU；
Fig. 2 is the principle schematic of a kind of frequency domain reflection measurement technology FDR；
Fig. 3 is the flow chart of steps of the embodiment of the method for a kind of remote radio unit (RRU) RRU standing-wave ratio detection of the present invention；
Fig. 4 is the schematic diagram of a kind of single port DUT calibration model of the present invention；
Fig. 5 is a kind of based on vector calibration technology the standing-wave ratio overhaul flow chart of the present invention；
Fig. 6 is a kind of OPD Yu RPD time-domain signal without synchronization process of the present invention；
Fig. 7 is a kind of OPD Yu RPD time-domain signal after synchronization process of the present invention；
Fig. 8 is a kind of based on vector calibration technology the standing-wave ratio detecting method of present invention application stream in actual environment
Cheng Tu；
Fig. 9 is the structured flowchart of the device embodiment of a kind of remote radio unit (RRU) RRU standing-wave ratio detection of the present invention.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, real with concrete below in conjunction with the accompanying drawings
The present invention is further detailed explanation to execute mode.
With reference to the structure chart of a kind of base station far-end radio frequency unit RRU shown in Fig. 1, at calibration plane, implement standing-wave ratio inspection
Survey, specifically can include circulator, voltage controlled oscillator (VCO, voltage controlled oscillator), bonder
(Coupler), frequency mixer (Mixer), analog-digital converter (ADC, Analog to Digital Converter), PA, load.
If base station system standing-wave ratio is bigger than normal, be unable to accurately detect, can cause RF (Radio Frequency Signal,
Radiofrequency signal) poured in down a chimney the prevention at radio-frequency port into RRU by antenna port, cause the phenomenon that power amplifier PA etc. burns.
At present, standing-wave ratio detection have employed such as scalar detection technology and FDR (Frequency Domain
Reflectometery, frequency domain reflection measurement technology) technology etc..
For scalar detection technology, it is assumed that the total voltage on one section of lossless transmission line is represented by
Section 1 in formula is the expression formula of incidence wave, and Section 2 is the expression formula of echo, and reflection coefficient is then that echo is with incident
The ratio of ripple.To calculate the reflection coefficient Γ at any point (l) place on transmission line, then make z=-l,Work as meter
After calculation draws reflection coefficient, available formulaAnd then try to achieve standing-wave ratio.Can from the expression formula of reflection coefficient
To find out, contain the amplitude information V0 of voltage, and phase information ej β l when calculating.For scalar detection technology, only make
With the amplitude information of voltage, and have ignored its phase information.The comparable simplicity of do so, is calculated current base station efficiently
The standing-wave ratio of system.In order to promote the precision of scalar detection technology further, some have employed launching and feedback signal amplitude
The technology of calibration.
Frequency domain reflection measurement technology FDR is a kind of based on vector measurement technology, and its ultimate principle is to tested cable
Middle injection a succession of RF sine sweep signal, breakpoint on tested cable or and the reflected signal that produces of other pip and input
RF swept-frequency signal be added or subtract each other and can produce corresponding spectrogram, specifically can refer to a kind of frequency domain reflection measurement shown in Fig. 2
Technology FDR principle schematic, figure produced by the vector of signal is the waveform along frequency axis, enters the vector of this signal
Row fast Flourier inverse transformation (IFFT) is converted to time-domain information.Relative propagation velocity according to cable just can calculate by survey line
Breakpoint in cable or trouble point distance.The insertion loss of cable can compensate with known cable attenuation value (dB/ foot).
On frequency relation figure, the quantity of waveform is directly proportional to the electrical distance of pip on transmission line, and the result that this Fourier transformation calculates is just
It is with the trouble point characteristic pattern represented relative to the actual standing-wave ratio of distance.
For scalar detection technology and relevant improving technology thereof, though significantly simpler to implement, they are all deposited
The highest in measuring accuracy, especially for standing-wave ratio relatively big in the case of.Additionally, for different frequencies and length of cable
In the case of, after application scalar detection method, result of calculation undulation is bigger, it is impossible to be enough reflected in one section or several sections band accurately
System standing-wave ratio situation in width.
For frequency domain reflection measurement technology FDR, although it is measurement technology based on a kind of vector, and certainty of measurement is relatively
Height, but the realization of this technology needs to increase extra hardware circuit, e.g., voltage controlled oscillator, bonder, frequency mixer, modulus
Transducer etc..This will cause the increase of RRU entirety link complexity, overall cost also to increase.It is thus impossible to it is enough
In the case of not increasing hardware cost, accurately detect the standing-wave ratio of RRU, and standing wave can be carried out in actual applications accurately
The detection of ratio is to ensure that the guardian technique that whole base station system is well run.
With reference to Fig. 1, it appeared that when calculation base station system standing-wave ratio, indeed through the output capturing RRU
Detection OPD calculates with reflection power detection RPD data.RRU comprises various active and passive device, due to cost
And the reason of manufacturing process, they are not the most preferable, i.e. there is signal and reveal and the problem of coupling, cause also existing necessarily
Systematic error.Now calculating the standing-wave ratio of RRU, OPD Yu RPD data and partial transmitting signal are mutually doping, cause
Certain calculating error.Therefore, in order to obtain result of calculation accurately, it is necessary to systematic error is calibrated.Observe Fig. 1 can send out
Existing, it is the form of a single port, therefore, the system that RRU inside is existed in the calibration plane of RRU and the junction of antenna
Error, it is possible to use the single port calibration method of vector network analyzer (VNA) is modeled analyzing.
Inventor herein is based on above-mentioned situation just, and creatively one of core idea proposing the embodiment of the present invention exists
In, single port calibration method and frequency domain reflection measurement technology are combined, based on vector calibration technology carries out standing-wave ratio detection, logical
Cross transmission swept-frequency signal, then obtain and calculate multiple relevant parameter and calibration data can accurately calculate standing-wave ratio.
With reference to Fig. 3, it is shown that the step of the embodiment of the method 1 of the present invention a kind of remote radio unit (RRU) RRU standing-wave ratio detection
Flow chart, can store calibration data in described RRU；
In one preferred embodiment of the invention, described calibration data can include directional error D, and skin tracking is by mistake
Difference R, and source mismatch error S, described calibration data can obtain in the following way:
Sub-step S11, uses preset training sequence to launch described swept-frequency signal to Devices to test；
Sub-step S12, uses RRU to capture the reflection power of described Devices to test when short circuit, open circuit, load matched respectively
Detection RPD feedback data；
Sub-step S13, uses the described reflection power detection RPD of described Devices to test when short circuit, open circuit, load matched
Feedback data calculates described directional error D, skin tracking error R, and source mismatch error S.
With reference to the schematic diagram of a kind of single port DUT calibration model of the present invention shown in Fig. 4, from fig. 4, it can be seen that base station system
In there are three kinds of errors, i.e. directional error D, skin tracking error R and source mismatch error S.Reflection actual in system
Coefficient Γ m can be calculated by following formula:
Wherein, a is incoming signal, and b is reflected signal, and S11 is reflection parameters.
By system carries out short circuit, open circuit and matched load are measured in three times, and recycling above-mentioned formula can try to achieve
Three kinds of error amounts present in system.
Measuring (M1) for the first time is short circuit, now S11=-1, and above formula becomes:
It is open circuit that second time measures (M2), now S11=1, and above formula becomes:
It is matched load 50 Europe that third time measures (M3), now S11=0, and above formula becomes:
M3=D
By above-mentioned three formulas M1, M2, M3, D, R and S can be solved.
D=M3
R=(M2-M3)*(1-S)
Systematic error once it is determined that, it is possible in succession solve the true reflection coefficient Γ m of system, and then try to achieve standing wave
Ratio.In embodiments of the present invention, follow-up measurement standing-wave ratio, systematic error is stored as calibration data,
Three kinds of calibration data can be directly read out by actual application, plenty of time and cost can have been saved.
Described method specifically may include steps of:
Step 101, generates swept-frequency signal；
Step 102, uses preset training sequence to launch described swept-frequency signal to Devices to test；
In implementing, after generating swept-frequency signal, its mode based on training sequence is launched, due to training
Sequence is produced by a basic code circulation, the most i.e. can eliminate intersymbol interference to a certain extent, can greatly reduce simultaneously
Amount of calculation, it is possible to increase systematic function, and method is simple, be easily achieved.
Step 103, uses described RRU to capture reflection power detection RPD feedback data and the output work of described Devices to test
Rate detection OPD feedback data；
In implementing, owing to containing such as power amplifier etc. inside RRU, there is non-linear equipment, base station system
In RRU the time delay in time and phase place is certainly existed for the collection of feedback signal (OPD and RPD).Therefore, in order to more accurate
Their duty of reflection, improve the accuracy measured, need the output to RRU detect, i.e. output detects
OPD feedback data captures, in order to reflection power detection RPD is carried out Phase synchronization operation.
Step 104, calculates according to described reflection power detection RPD feedback data and output detection OPD feedback data
Reflection parameters；
In one preferred embodiment of the invention, described step 104 can include following sub-step:
Sub-step S21, uses described output detection OPD feedback data that described reflection power is detected RPD feedback coefficient
According to carrying out Phase synchronization operation；
Sub-step S22, segmentation from each preset resident frequency after described Phase synchronization reflection power detection RPD anti-
Feedback extracting data tone signal；
Sub-step S23, obtains peak-peak according to described tone signal；
Sub-step S24, uses described peak-peak and calculates reflection parameters.
In one preferred embodiment of the invention, described sub-step S22 can include following sub-step:
Sub-step S22-1, carries out fast Fourier transform FFT and obtains frequency domain character figure described tone signal；
Sub-step S22-2, calculates the peak-peak in nominated bandwidth from described frequency domain character figure.
In implementing, the tone signal for swept-frequency signal carries out FFT, obtains the frequency domain character figure of signal,
Now can then solve the peak-peak of signal in this section of bandwidth.Wherein, peak-peak can apply to calculate emission ratio.
Step 105, uses the calibration data in described reflection parameters and described RRU to calculate accurate reflection coefficient；
Step 106, uses the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth；
Step 107, uses described average reflection coefficient to calculate standing-wave ratio.
In embodiments of the present invention, when calculating reflection coefficient, the calibration precalculating in RRU and storing can be obtained
Data, i.e. directional error D, skin tracking error R, and source mismatch error S.Utilize calibration data to calibrate, can calculate
Go out accurate reflection parameters, the system constant error brought due to devices such as circulators in RRU system can be removed, further according to essence
True reflection parameters calculates the accurate reflection coefficient of each section of swept-frequency signal, the system that finally calculates average reflection in prescribed bandwidth
Coefficient.Standing-wave ratio computing formula finally can be utilized to use average reflection coefficient can calculate accurate standing-wave ratio.
The single port collimation technique of vector network analyzer is combined by the embodiment of the present invention with frequency domain reflection measurement technology,
And make use of TD base station system to send the feature of training sequence, by obtaining OPD Yu RPD data, devise and a set of can accurately count
The method and apparatus of calculation system standing-wave ratio.In order to make it is further understood that the embodiment of the present invention, below to tool
Body scheme is described in detail.
With reference to a kind of based on vector calibration technology the standing-wave ratio overhaul flow chart of the present invention shown in Fig. 5, believe from frequency sweep
The calculating generated to final system standing-wave ratio in number source exports, and altogether can be attributed to 14 steps.
Step 1: the sine sweep signal in analog frequency domain reflection measurement technology FDR, first has in step 1 in RRU side
Generate swept signal source.The form that generates of this RF signal source is consistent with the training sequence of TD base station system, but amplitude calibration
Value needs are modified, and can arrange amplitude calibration value is A herein.Additionally, the sigtnal interval of each swept-frequency signal can be according to quilt
The requirement of the bandwidth and frequency resolution of surveying RRU passage is arranged flexibly.
Step 2: the RF swept signal source that will generate in step 1, is carried out once in the training sequence mode of TD base station system
Launch.
Step 3: there is non-linear equipment, therefore, in order to more accurate owing to containing such as power amplifier etc. inside RRU
Their duty of reflection, improve the accuracy measured, need the output to RRU to detect, i.e. OPD data are grabbed
Take.
Step 4: distinguish grasping system reflection power under short circuit, open circuit and matched load state by RRU and detect,
I.e. RPD data.Carry out the main purpose of this step be in order to use above-mentioned single port collimation technique obtain systematic error D, R,
S, and then system is calibrated.Therefore, in order to improve measurement efficiency, save the measurement time, by system short circuit, open circuit with
And calibration data D, R, S of the RPD data acquisition under matched load can be stored in the memorizer of RRU internal system, as
(Electrically Erasable Programmable Read-Only Memory, electric erazable programmable is read-only to be deposited EEPROM
Reservoir) or other memorizeies in.After so processing, the detection of outfield standing-wave ratio need not carry out every time short circuit, open circuit and
Join the RPD detection under load condition, then carry out the calculating of systematic error.The substitute is and these three calibration data is directly entered
Row reads, and has therefore saved plenty of time and cost.
Step 5: by RRU device under test (DUT), such as antenna, carry out the crawl of RPD data.
Step 6: all data (including OPD and RPD) grabbed by RRU are carried out data signal process.Due to
The RF swept-frequency signal generated in step 1 belongs to baseband signal, so its feedback signal carries stronger DC component, because of
This, it is necessary first to they are carried out DC processing.After this, in addition it is also necessary to the image signal in primary signal is calibrated
Process, thus reject the interference signal in feedback signal.
Step 7: the RRU in base station system certainly exists in time and phase place for the collection of feedback signal (OPD and RPD)
Time delay.Mode based on vector measurement includes the phase information of signal, it is therefore necessary to synchronize the signal collected
Compensation deals.By the time-frequency characteristic analysis to feedback signal, contrast general multitone and pseudo-random sequence, it is possible to find RF frequency sweep is believed
Number there is more preferable autocorrelation performance.Specifically be referred to a kind of OPD without synchronization process of the present invention shown in Fig. 6 with
RPD time-domain signal, with a kind of OPD Yu RPD time-domain signal after synchronization process of the present invention shown in Fig. 7, is shown respectively
OPD Yu RPD time-domain signal characteristic before and after synchronization process.
Step 8: from the feedback signal captured, the swept-frequency signal of each resident frequency of stage extraction, is i.e. extracted in one respectively
The tone signal realized in determining bandwidth.Such as, in the range of certain bandwidth B, realize swept-frequency signal, swept-frequency signal be spaced apart G,
Then the swept-frequency signal quantity in this section of bandwidth is T=B/G.The dwell length of each of which root swept-frequency signal is that L/T, L are
The data length of actual signal.
Step 9: respectively the swept-frequency signal extracted in step 8 is carried out FFT, obtain the frequency domain character figure of signal, this
Time can then solve the peak-peak of signal in this section of bandwidth.This peak-peak is applied in subsequent step the anti-of the system that calculates
Penetrate coefficient.
Step 10: utilize the peak value of each feedback signal calculated in step 9, respectively for short circuit, open a way, mate with
And the signal of Devices to test calculates its reflection parameters.The reflection parameters now calculated is the reflection parameters containing systematic error.
Step 11: use the single port calibration steps of above-mentioned vector network analyzer to calculate systematic error D, R, S.Wherein
M1, M2, M3 are the system RPD signal under short circuit, open circuit and matched load state captured by RRU in step 4.
Step 12: utilize the systematic error drawn in step 11 that error present in RRU system is calibrated, and utilize
FormulaCalculate accurate reflection coefficient, i.e. eliminate in RRU system due to devices such as circulators
The system constant error brought.
Step 13: use the accurate reflection coefficient of each section of swept-frequency signal obtained in step 12, the system that calculates is at regulation band
Average reflection coefficient in width.
Step 14: so far, the standing-wave ratio in system bandwidth may utilize aforementioned formulaCalculate.
What 14 above-mentioned steps were described in detail standing-wave ratio detecting method based on vector calibration technology realizes flow process.Need
It is noted that these detailed steps are the flow processs that realizes of whole detection method and device, but in actual application, due to
The calibration data in RRU system is stored, it is not necessary to recalculate, therefore all about short in above-mentioned steps
The operations such as road, open circuit, matched load and calculating systematic error D, R, S all can be omitted, and this makes the present invention in actual applications
The most convenient.
The present invention is through saving the calculating of short circuit, open circuit, the process of matched load RPD data and systematic error D, R, S
Actual application flow after slightly exists with reference to a kind of based on vector calibration technology the standing-wave ratio detecting method of the present invention shown in Fig. 8
Applicating flow chart in actual environment.Due to Fig. 5 basic simlarity, therefore do not repeat at this.
A kind of based on vector measurement technology RRU standing-wave ratio detecting method and device that the embodiment of the present invention is proposed are compared
In prior art, mainly there is following several respects advantage.
The first, SWR measurement precision is high.
The method that the embodiment of the present invention is proposed is applied to existing base station system and need not increase extra hardware cost, only
The a small amount of DSP (Digital Signal Processor, digital signal processor) utilizing base station system is needed just to calculate resource
High-precision base station standing-wave ratio detection function can be realized.The base station worked under an actual environment uses the method to RRU's
Standing-wave ratio has carried out validation test, employs the mismatched load of standard in test, then utilizes the embodiment of the present invention to be proposed
Method carries out the calculating of system standing-wave ratio, and the result of calculation of its embodiment of the present invention is tested with vector network analyzer (VNA)
Result compare, be specifically referred to the comparison result row of method that the embodiment of the present invention shown in table 1 proposes and VNA test
In table 1.
Table 1:
| VSWR | Standard mismatched load=3.0 | Standard mismatched load=1.5 |
| VNA test result | 3.495 | 1.558 |
| The inventive method result of calculation | 3.586 | 1.508 |
| The two difference | +0.091 | -0.05 |
Can be known by table 1, the standing-wave ratio detection obtained by the standing-wave ratio detecting method that the application embodiment of the present invention proposes
Result differs only by 0.091 He with the test result of VNA respectively for the equipment that standard mismatched load is 3.0 and 1.5, its standing-wave ratio
0.05.Thus, it is possible to prove that the method that the embodiment of the present invention is proposed is efficiently and accurately.
Use the standing-wave ratio detecting method that the embodiment of the present invention is proposed, BTS hardware is safeguarded and testing staff comes
Say, when carrying out the detection operation of base station equipment standing-wave ratio, it is not necessary to carry heavy expensive instrument, it is not required that carry out every time
The calibration of loaded down with trivial details short circuit, open circuit and matched load, but merely with being stored in the school of RRU internal storage (such as E2PROM)
Quasi-data, just can realize base station system accurate standing-wave ratio detection function.
Certainly, if conditions permit, it is also possible to every time or cut off the time just to calculating primary calibration data, present invention reality
Execute example this is not restricted.
The second, SWR measurement result is stable.
The application embodiment of the present invention, standing-wave ratio result of calculation is relatively stable.By the calibration to systematic error, the present invention is real
Execute example to be affected by RRU its exterior environmental change.Such as, it is respectively at RRU port and at RRU when calibration plane
Port adds extra RF cable and attenuator, relative to scalar detection method, the standing-wave ratio obtained by the embodiment of the present invention
Testing result change is minimum, is specifically referred to the method that the embodiment of the present invention shown in table 2 proposed and exists with scalar detection method
Testing result in the case of the change of RRU external environment condition.
Table 2:
From table 2 it can be seen that using scalar detection method is RRU port and the feelings of 1 meter of radio frequency line+attenuator in calibration plane
Under shape, for the equipment that standard mismatched load is 3.0 and 1.5, its standing-wave ratio differs 16.2029 and 0.4510 respectively, thus may be used
Knowing, the standing-wave ratio fluctuation using scalar detection method to measure is bigger.And the method using the embodiment of the present invention, in calibration plane it is
When RRU port and 1 meter of radio frequency line+attenuator, for the equipment that standard mismatched load is 3.0 and 1.5, its standing wave score
Xiang Cha 0.0034 and 0.2744, it is easy to learning, compared with scalar detection method, fluctuating less, testing result is stable, accurately.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of action group
Closing, but those skilled in the art should know, the application is not limited by described sequence of movement, because according to this Shen
Please, some step can use other orders or carry out simultaneously.Secondly, those skilled in the art also should know, description
Described in embodiment belong to preferred embodiment, necessary to involved action not necessarily the application.
With reference to Fig. 9, it is shown that the structure of the device embodiment of a kind of remote radio unit (RRU) RRU standing-wave ratio detection of the present invention
Block diagram, can store calibration data in described RRU, described device can include such as lower module:
Generation module 201, is used for generating swept-frequency signal；
First transmitter module 202, for using preset training sequence to launch described swept-frequency signal to Devices to test；
First handling module 203, for using described RRU to capture the reflection power detection RPD feedback of described Devices to test
Data and output detection OPD feedback data；
First computing module 204, for according to described reflection power detection RPD feedback data and output detection OPD
Feedback data calculates reflection parameters；
In one preferred embodiment of the invention, described first computing module 204 may include that
Calibration submodule, is used for using described output detection OPD feedback data anti-to described reflection power detection RPD
Feedback data operate after carrying out Phase synchronization；
Segmentation captures submodule, for segmentation from each preset resident frequency reflection power after described Phase synchronization
Detection RPD feedback data extracts tone signal；
Peak value obtains submodule, for obtaining peak-peak according to described tone signal；
Reflection parameters calculating sub module, is used for using described peak-peak and calculating reflection parameters.
In one preferred embodiment of the invention, described peak value acquisition submodule includes:
Converter unit, obtains frequency domain character figure for described tone signal carries out fast Fourier transform FFT；
Peak computational unit, for calculating the peak-peak in nominated bandwidth from described frequency domain character figure.
Second computing module 205, for using the calibration data in described reflection parameters and described RRU to calculate accurate reflection
Coefficient；
In one preferred embodiment of the invention, described calibration data can include directional error D, and skin tracking is by mistake
Difference R, and source mismatch error S, described device can also include:
Second transmitter module, for using preset training sequence to launch described swept-frequency signal to Devices to test；
Second handling module, for using RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively
Reflection power detection RPD feedback data；
5th computing module, for using the described reflection power of described Devices to test when short circuit, open circuit, load matched
Detection RPD feedback data calculates described directional error D, skin tracking error R, and source mismatch error S.
3rd computing module 206, the average reflection coefficient in using described accurate reflection coefficient calculations nominated bandwidth；
4th computing module 207, is used for using described average reflection coefficient to calculate standing-wave ratio.
For device embodiment, due to itself and embodiment of the method basic simlarity, so describe is fairly simple, relevant
Part sees the part of embodiment of the method and illustrates.
Each embodiment in this specification all uses the mode gone forward one by one to describe, what each embodiment stressed is with
The difference of other embodiments, between each embodiment, identical similar part sees mutually.
Those skilled in the art are it should be appreciated that embodiments herein can be provided as method, device or computer program
Product.Therefore, the reality in terms of the application can use complete hardware embodiment, complete software implementation or combine software and hardware
Execute the form of example.And, the application can use at one or more computers wherein including computer usable program code
The upper computer program product implemented of usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, equipment (system) and the flow process of computer program according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Although having been described for the preferred embodiment of the application, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the application scope.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, do not arrange
Except there is also other identical element in including the process of described key element, method, article or equipment.
Method to a kind of remote radio unit (RRU) RRU standing-wave ratio provided by the present invention detection above, and, a kind of far-end
The device of radio frequency unit RRU standing-wave ratio detection, is described in detail, the specific case principle to the present invention used herein
And embodiment is set forth, the explanation of above example is only intended to help to understand that the method for the present invention and core thereof are thought
Think；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, in specific embodiments and applications
All will change, in sum, this specification content should not be construed as limitation of the present invention.
Claims (8)
1. a method for remote radio unit (RRU) RRU standing-wave ratio detection, in described RRU, storage has calibration data, it is characterised in that
Described method includes:
Generate swept-frequency signal；
Preset training sequence is used to launch described swept-frequency signal to Devices to test；
Described RRU is used to capture reflection power detection RPD feedback data and the output detection OPD feedback of described Devices to test
Data；
Reflection parameters is calculated according to described reflection power detection RPD feedback data and output detection OPD feedback data；
Wherein, described according to described reflection power detection RPD feedback data and output detection OPD feedback data calculate reflection
The step of parameter includes:
Use described output detection OPD feedback data that described reflection power detection RPD feedback data is carried out Phase synchronization
Operation；
Segmentation is extracted single from each preset resident frequency reflection power detection RPD feedback data after described Phase synchronization
Tone signal；
Peak-peak is obtained according to described tone signal；
Use described peak-peak and calculate reflection parameters；
The calibration data in described reflection parameters and described RRU is used to calculate accurate reflection coefficient；
Use the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth；
Described average reflection coefficient is used to calculate standing-wave ratio.
Method the most according to claim 1, it is characterised in that described calibration data includes directional error D, skin tracking
Error R, and source mismatch error S, described calibration data obtains in the following way:
Preset training sequence is used to launch described swept-frequency signal to Devices to test；
RRU is used to capture the reflection power detection RPD feedback coefficient of the described Devices to test when short circuit, open circuit, load matched respectively
According to；
Described in using, when short circuit, open circuit, load matched, the reflection power detection RPD feedback data of described Devices to test calculates institute
State directional error D, skin tracking error R, and source mismatch error S.
Method the most according to claim 1, it is characterised in that the described step obtaining peak-peak according to described tone signal
Suddenly include:
Described tone signal is carried out fast Fourier transform FFT and obtains frequency domain character figure；
The peak-peak in nominated bandwidth is calculated from described frequency domain character figure.
Method the most according to claim 1, it is characterised in that described Devices to test is antenna.
5. a device for remote radio unit (RRU) RRU standing-wave ratio detection, in described RRU, storage has calibration data, it is characterised in that
Described device includes:
Generation module, is used for generating swept-frequency signal；
First transmitter module, for using preset training sequence to launch described swept-frequency signal to Devices to test；
First handling module, for using described RRU to capture the reflection power detection RPD feedback data and defeated of described Devices to test
Go out power detection OPD feedback data；
First computing module, for according to described reflection power detection RPD feedback data and output detection OPD feedback data
Calculate reflection parameters；
Wherein, described first computing module includes:
Calibration submodule, is used for using described output detection OPD feedback data that described reflection power is detected RPD feedback coefficient
According to carrying out Phase synchronization operation；
Segmentation capture submodule, for segmentation from each preset resident frequency after described Phase synchronization reflection power detection
RPD feedback data is extracted tone signal；
Peak value obtains submodule, for obtaining peak-peak according to described tone signal；
Reflection parameters calculating sub module, is used for using described peak-peak and calculating reflection parameters；
Second computing module, for using the calibration data in described reflection parameters and described RRU to calculate accurate reflection coefficient；
3rd computing module, the average reflection coefficient in using described accurate reflection coefficient calculations nominated bandwidth；
4th computing module, is used for using described average reflection coefficient to calculate standing-wave ratio.
Device the most according to claim 5, it is characterised in that described calibration data includes directional error D, skin tracking
Error R, and source mismatch error S, described device also includes:
Second transmitter module, for using preset training sequence to launch described swept-frequency signal to Devices to test；
Second handling module, for using RRU to capture the reflection of described Devices to test when short circuit, open circuit, load matched respectively
Power detection RPD feedback data；
5th computing module, for using the described reflection power detection of described Devices to test when short circuit, open circuit, load matched
RPD feedback data calculates described directional error D, skin tracking error R, and source mismatch error S.
Device the most according to claim 5, it is characterised in that described peak value obtains submodule and includes:
Converter unit, obtains frequency domain character figure for described tone signal carries out fast Fourier transform FFT；
Peak computational unit, for calculating the peak-peak in nominated bandwidth from described frequency domain character figure.
Device the most according to claim 5, described Devices to test is antenna.
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| CN106487461B (en) * | 2015-08-28 | 2019-02-26 | 大唐移动通信设备有限公司 | A kind of standing wave peak value determines method and apparatus |
| CN106549721A (en) * | 2015-09-23 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of standing-wave ratio detecting method and device and base station |
| CN107994959B (en) * | 2016-10-26 | 2020-10-16 | 普天信息技术有限公司 | Method and device for detecting standing-wave ratio of remote radio unit RRU |
| CN111030760B (en) * | 2019-12-23 | 2022-04-22 | 京信网络系统股份有限公司 | Standing wave detection method and device |
| CN112799315B (en) * | 2020-12-29 | 2022-02-01 | 成都沃特塞恩电子技术有限公司 | Radio frequency control method and device and radio frequency source |
| CN113406527B (en) * | 2021-05-13 | 2023-05-16 | 北京北方华创微电子装备有限公司 | Radio frequency power supply control system, calibration method and device thereof and semiconductor device |
| CN114124251A (en) * | 2021-12-01 | 2022-03-01 | 哲库科技(北京)有限公司 | Calibration method, electronic device, chip and storage medium |
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| CN102325339B (en) * | 2011-07-22 | 2014-08-13 | 京信通信系统（中国）有限公司 | Standing wave detection method and device and radio remote unit |
| JP2013048338A (en) * | 2011-08-29 | 2013-03-07 | Hitachi Kokusai Electric Inc | Radio amplifier vswr detection circuit |
| CN103297154B (en) * | 2012-02-28 | 2015-03-18 | 鼎桥通信技术有限公司 | Method and device for detecting standing-wave ratio |
| CN103427915B (en) * | 2012-05-25 | 2016-08-31 | 南京中兴软件有限责任公司 | A kind of radio-frequency apparatus standing-wave ratio detection in remove interference method and device |
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| CN203225773U (en) * | 2013-04-11 | 2013-10-02 | 京信通信系统（中国）有限公司 | Antenna feed system standing wave detection device |
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