CN104270208A - 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 a kind of method that remote radio unit (RRU) RRU standing-wave ratio detects, and, the device that a kind of remote radio unit (RRU) RRU standing-wave ratio detects.
Background technology
Mainly have employed distributed frame in current comparatively popular base station system architectures, is be made up of RRU (Remote Radio Unit, remote radio unit (RRU)) and BBU (Building Base band Unit, indoor baseband processing unit).The important function of of base station system architectures is exactly the detection realizing system standing-wave ratio, and standing-wave ratio measures an index of reflective properties.SWR (Standard Wave Ratio, standing-wave ratio)/VSWR (Voltage Standing Wave Ratio, voltage standing wave ratio) refer to and each antenna channels of RRU is detected, thus measure the standing wave value obtaining each antenna port of RRU, thus know the matching state of antenna port in time, standing-wave ratio detects and mainly comprises OPD (Output Power Detector, power output detects) and RPD (Return Power Detector, reflection power detects).
If base station system standing-wave ratio is bigger than normal, and can not accurately detect, RF (Radio Frequency Signal can be caused, radiofrequency signal) pour in down a chimney the prevention at radio-frequency port into RRU by antenna port, cause the phenomenon that the devices such as the power amplifier PA in RRU (power amplifier, power amplifier) burn.
Therefore, one of problem that those skilled in the art are in the urgent need to address is, proposes method and the device of the detection of a kind of remote radio unit (RRU) RRU standing-wave ratio, in order to accurately to detect the standing-wave ratio of RRU.
Summary of the invention
Technical problem to be solved by this invention is to provide method and the device of the detection of a kind of remote radio unit (RRU) RRU standing-wave ratio, in order to accurately to detect the standing-wave ratio of RRU.
In order to solve the problem, the invention discloses a kind of method that remote radio unit (RRU) RRU standing-wave ratio detects, store calibration data in described RRU, described method comprises:
Generate swept-frequency signal;
Preset training sequence is adopted to launch described swept-frequency signal to Devices to test;
The reflection power adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
RPD feedback data and power output detection OPD feedback data computational reflect parameter is detected according to described reflection power;
The calibration data in described reflection parameters and described RRU is adopted to calculate accurate reflection coefficient;
Adopt the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
Described average reflection coefficient is adopted to calculate standing-wave ratio.
Preferably, described calibration data comprises directional error D, skin tracking error R, and source mismatch error S, and described calibration data obtains in the following way:
Preset training sequence is adopted to launch described swept-frequency signal to Devices to test;
The reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively detects RPD feedback data;
Adopt the reflection power of the described described Devices to test when short circuit, open circuit, load matched to detect RPD feedback data and calculate described directional error D, skin tracking error R, and source mismatch error S.
Preferably, the described step according to described reflection power detection RPD feedback data and power output detection OPD feedback data computational reflect parameter comprises:
Adopt described power output to detect OPD feedback data and Phase synchronization operation is carried out to described reflection power detection RPD feedback data;
Segmentation detects RPD feedback data from the reflection power of each preset resident frequency after described Phase synchronization and extracts tone signal;
Peak-peak is obtained according to described tone signal;
Adopt described peak-peak and computational reflect parameter.
Preferably, the described step according to described tone signal acquisition peak-peak comprises:
Fast Fourier transform FFT is carried out to described tone signal 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 that a kind of remote radio unit (RRU) RRU standing-wave ratio detects, store calibration data in described RRU, described device comprises:
Generation module, for generating swept-frequency signal;
First transmitter module, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
First handling module, the reflection power for adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
First computing module, for detecting RPD feedback data and power output detection OPD feedback data computational reflect parameter according to described reflection power;
Second computing module, calculates accurate reflection coefficient for adopting the calibration data in described reflection parameters and described RRU;
3rd computing module, for adopting the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
4th computing module, calculates standing-wave ratio for adopting described average reflection coefficient.
Preferably, described calibration data comprises directional error D, skin tracking error R, and source mismatch error S, and described device also comprises:
Second transmitter module, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
Second handling module, detects RPD feedback data for the reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively;
5th computing module, for adopt described when short circuit, open circuit, load matched the reflection power of described Devices to test detect RPD feedback data and calculate described directional error D, skin tracking error R, and source mismatch error S.
Preferably, described first computing module comprises:
Calibration submodule, detects OPD feedback data for adopting described power output and carries out Phase synchronization operation to described reflection power detection RPD feedback data;
Segmentation captures submodule, to detect RPD feedback data extract tone signal for segmentation from the reflection power of each preset resident frequency after described Phase synchronization;
Peak value obtains submodule, for obtaining peak-peak according to described tone signal;
Reflection parameters calculating sub module, for adopting described peak-peak and computational reflect parameter.
Preferably, described peak value acquisition submodule comprises:
Converter unit, obtains frequency domain character figure for carrying out fast Fourier transform FFT to described tone signal;
Peak value computing 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 comprises following advantage:
In the embodiment of the present invention, single port calibration method and frequency domain reflection measuring technology are combined, carry out standing-wave ratio detection based on vector calibration technology, by sending swept-frequency signal, then obtain and calculate multiple relevant parameter and calibration data can accurately calculate standing-wave ratio.The understanding current device standing-wave ratio situation enabling base station equipment administrative staff accurately real-time, contributes to the service behaviour of base station maintenance system, better prevents expensive base station equipment from occurring situation about damaging.
Adopt the mode generating and utilize base band swept-frequency signal in the embodiment of the present invention, use the mode of TD base station system transmitting training sequence, intersymbol interference can be eliminated to a certain extent, can amount of calculation be greatly reduced simultaneously.The amplitude criteria of swept-frequency signal can adjust accordingly according to demand, in embodiments of the present invention can Tiao Zheng Wei – A.
The power output simultaneously capturing RRU is needed to detect OPD feedback data and reflection power detection RPD feedback data in the embodiment of the present invention, corresponding calibration is carried out to data and goes perturbation operation, ensure the accuracy that standing-wave ratio detects thus, reflect the operating state of each nonlinear device in RRU system accurately.
In the embodiment of the present invention, single port collimation technique is applied to RRU system, and the calibration data calculated can be stored in RRU internal system, conveniently apply at any time in the future, significantly promote and measure efficiency, reduce and measure cost at every turn.
In the embodiment of the present invention, the feedback signal OPD collected and RPD is carried out to the mechanism of synchroballistic process, ensure the time delay in OPD and RPD feedback data time and phase place with this.
In the embodiment of the present invention, standing-wave ratio detecting method can utilize computer program to realize, and be applied to base station system, do not need to increase extra hardware cost, only need a small amount of DSP computational resource utilizing base station system, and storage resources, the just accurate standing-wave ratio measuring ability of feasible system.
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 measuring technology FDR;
Fig. 3 is the flow chart of steps of the embodiment of the method that a kind of remote radio unit (RRU) RRU standing-wave ratio of the present invention detects;
Fig. 4 is the schematic diagram of a kind of single port DUT calibrating patterns of the present invention;
Fig. 5 is a kind of standing-wave ratio overhaul flow chart based on vector calibration technology of the present invention;
Fig. 6 is a kind of OPD and RPD time-domain signal without synchronous process of the present invention;
Fig. 7 is a kind of OPD and RPD time-domain signal after synchronously process of the present invention;
Fig. 8 is the applicating flow chart of a kind of standing-wave ratio detecting method based on vector calibration technology of the present invention in actual environment;
Fig. 9 is the structured flowchart of the device embodiment that a kind of remote radio unit (RRU) RRU standing-wave ratio of the present invention detects.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
With reference to the structure chart of a kind of base station far-end radio frequency unit RRU shown in Fig. 1, implement standing-wave ratio to detect at calibration plane place, specifically can comprise circulator, voltage controlled oscillator (VCO, voltage controlled oscillator), coupler (Coupler), frequency mixer (Mixer), analog to digital converter (ADC, Analog to Digital Converter), PA, load.If base station system standing-wave ratio is bigger than normal, and can not accurately detect, RF (Radio Frequency Signal, radiofrequency signal) can be caused to pour 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 detects and have employed as scalar detection technology and FDR (Frequency Domain Reflectometery, frequency domain reflection measuring technology) technology etc.
For scalar detection technology, suppose that the total voltage on one section of lossless transmission line can be expressed as
section 1 in formula is the expression formula of incident wave, and Section 2 is the expression formula of reflected wave, and reflection coefficient is then reflected wave and the ratio of incident wave.To calculate the reflection coefficient Γ at any point (l) place on transmission line, then make z=-l,
after calculating reflection coefficient, formula can be utilized
and then try to achieve standing-wave ratio.As can be seen from the expression formula of reflection coefficient, contain the amplitude information V0 of voltage when calculating, and phase information ej β l.For scalar detection technology, only used the amplitude information of voltage, and have ignored its phase information.Doing like this can be easier, calculates the standing-wave ratio of current base station system efficiently.In order to promote the precision of scalar detection technology further, some have employed the technology to transmitting and feedback signal amplitude calibration.
Frequency domain reflection measuring technology FDR is a kind of based on vector measurement technology, its general principle is in tested cable, inject a succession of RF sine sweep signal, breakpoint on tested cable or and the reflected signal that produces of other pip be added to the RF swept-frequency signal of input or subtract each other and can produce corresponding spectrogram, specifically can refer to a kind of frequency domain reflection measuring technology FDR principle schematic shown in Fig. 2, the figure that the vector of signal produces is the waveform along frequency axis, carries out invert fast fourier transformation (IFFT) be converted to time-domain information to the vector of this signal.Breakpoint in tested cable or fault point distance just can be calculated according to the relative propagation velocity of cable.The insertion loss of cable can compensate by 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 transform calculates is exactly the fault point characteristic pattern represented by the actual standing-wave ratio relative to distance.
For scalar detection technology and relevant improving technology thereof, although implement comparatively simple, it is not high that they all also exist measuring accuracy, when particularly large for standing-wave ratio.In addition, when for different frequencies and length of cable, after application scalar detection method, result of calculation undulation is comparatively large, can not be reflected in one section or the wide interior system standing-wave ratio situation of a few length of tape accurately.
For frequency domain reflection measuring technology FDR, although it is the measuring technique based on a kind of vector, and certainty of measurement is higher, and the realization of this technology needs to increase extra hardware circuit, e.g., and voltage controlled oscillator, coupler, frequency mixer, analog to digital converter etc.This will cause the increase of the overall link complexity of RRU, and overall cost also increases.Therefore, when not increasing hardware cost, can not accurately detect the standing-wave ratio of RRU, and can the detection carrying out standing-wave ratio in actual applications be accurately the guardian technique ensureing that whole base station system is well run.
With reference to Fig. 1, can find when calculation base station system standing-wave ratio, detect OPD and reflection power indeed through the power output capturing RRU and detect that RPD data calculate.Contain various active and passive device in RRU, due to cost and manufacturing process, they are not desirable, namely there is the problem of leakage signal and coupling, cause there is certain systematic error.Now calculate the standing-wave ratio of RRU, OPD and RPD data and partial transmitting signal mutually adulterate, and causes certain error of calculation.Therefore, in order to obtain result of calculation accurately, must calibrate systematic error.Observing Fig. 1 can find, is the form of a single port in the calibration plane of RRU and the junction of antenna, therefore, for the systematic error that RRU inside exists, the single port calibration method of vector network analyzer (VNA) can be used to carry out modeling analysis.
Inventor herein is based on above-mentioned situation just, creatively one of core idea proposing the embodiment of the present invention is, single port calibration method and frequency domain reflection measuring technology are combined, standing-wave ratio detection is carried out based on vector calibration technology, by sending swept-frequency signal, then obtain and calculate multiple relevant parameter and calibration data can accurately calculate standing-wave ratio.
With reference to Fig. 3, show the flow chart of steps of the embodiment of the method 1 that a kind of remote radio unit (RRU) RRU of the present invention standing-wave ratio detects, in described RRU, can calibration data be stored;
In one preferred embodiment of the invention, described calibration data can comprise directional error D, skin tracking error R, and source mismatch error S, and described calibration data can obtain in the following way:
Sub-step S11, adopts preset training sequence to launch described swept-frequency signal to Devices to test;
Sub-step S12, the reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively detects RPD feedback data;
Sub-step S13, adopts the reflection power of the described described Devices to test when short circuit, open circuit, load matched to detect RPD feedback data and calculates described directional error D, skin tracking error R, and source mismatch error S.
With reference to the schematic diagram of the of the present invention a kind of single port DUT calibrating patterns shown in Fig. 4, as seen from Figure 4, there are three kinds of errors in base station system, that is, directional error D, skin tracking error R and source mismatch error S.Reflection coefficient Γ m actual in system calculates by following formula:
Wherein, a is incoming signal, and b is reflected signal, and S11 is reflection parameters.
By carrying out short circuit to system, open circuit and matched load divide three measurements, recycle above-mentioned formula and can try to achieve the three kinds of error amounts existed in system.
It is short circuit, now S11=-1 that first time measures (M1), and above formula becomes:
Second time measures (M2) for open circuit, 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 formula M1, M2, M3, can solve D, R and S.
D＝M3
R＝(M
2-M
3)*(1-S)
Systematic error, once determine, just in succession can solve the true reflection coefficient Γ m of system, and then try to achieve standing-wave ratio.In embodiments of the present invention, conveniently follow-up measurement standing-wave ratio, stores systematic error as calibration data, directly can read in actual applications, can save plenty of time and cost to three kinds of calibration data.
Described method specifically can comprise the steps:
Step 101, generates swept-frequency signal;
Step 102, adopts preset training sequence to launch described swept-frequency signal to Devices to test;
In specific implementation, when after generation swept-frequency signal, its mode based on training sequence is launched, because training sequence is produced by a basic code circulation, so namely, intersymbol interference can be eliminated to a certain extent, simultaneously can greatly reduce amount of calculation, can systematic function be improved, and method simple, be easy to realize.
Step 103, the reflection power adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
In specific implementation, have non-linear equipment because RRU inside contains such as power amplifier etc., the RRU in base station system certainly exists the time delay in time and phase place for the collection of feedback signal (OPD and RPD).Therefore, in order to reflect their operating state more accurately, improving the accuracy measured, needing to detect the power output of RRU, namely power output detection OPD feedback data captures, and carries out Phase synchronization operation in order to detect RPD to reflection power.
Step 104, detects RPD feedback data according to described reflection power and power output detects OPD feedback data computational reflect parameter;
In one preferred embodiment of the invention, described step 104 can comprise following sub-step:
Sub-step S21, adopts described power output to detect OPD feedback data and carries out Phase synchronization operation to described reflection power detection RPD feedback data;
Sub-step S22, segmentation detects RPD feedback data from the reflection power of each preset resident frequency after described Phase synchronization and extracts tone signal;
Sub-step S23, obtains peak-peak according to described tone signal;
Sub-step S24, adopts described peak-peak and computational reflect parameter.
In one preferred embodiment of the invention, described sub-step S22 can comprise following sub-step:
Sub-step S22-1, carries out fast Fourier transform FFT to described tone signal and obtains frequency domain character figure;
Sub-step S22-2, calculates the peak-peak in nominated bandwidth from described frequency domain character figure.
In specific implementation, the tone signal for swept-frequency signal carries out FFT conversion, obtains the frequency domain character figure of signal, now then can solve the peak-peak of the wide interior signal of this length of tape.Wherein, peak-peak can be applied to calculating emission ratio.
Step 105, adopts the calibration data in described reflection parameters and described RRU to calculate accurate reflection coefficient;
Step 106, adopts the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
Step 107, adopts described average reflection coefficient to calculate standing-wave ratio.
In embodiments of the present invention, when calculating reflection coefficient, can obtain and precalculate and the calibration data stored in RRU, be i.e. directional error D, skin tracking error R, and source mismatch error S.Calibration data is utilized to calibrate, accurate reflection parameters can be calculated, can remove in RRU system due to system intrinsic error that the devices such as circulator bring, the accurate reflection coefficient of each section of swept-frequency signal is calculated again, the average reflection coefficient of last computing system in prescribed bandwidth according to accurate reflection parameters.Standing-wave ratio computing formula finally can be utilized to adopt average reflection coefficient can calculate accurate standing-wave ratio.
The single port collimation technique of vector network analyzer and frequency domain are reflected measuring technology and combine by the embodiment of the present invention, and make use of the feature that TD base station system sends training sequence, by obtaining OPD and RPD data, devise a set of can the method and apparatus of accurate Calculation system standing-wave ratio.In order to make those skilled in the art understand the embodiment of the present invention further, below concrete scheme is described in detail.
With reference to the of the present invention a kind of standing-wave ratio overhaul flow chart based on vector calibration technology shown in Fig. 5, export from the generation of swept signal source to the calculating of final system standing-wave ratio, altogether can be summed up as 14 steps.
Step 1: the sine sweep signal in analog frequency domain reflection measurement technology FDR, first will generate swept signal source in RRU side in step 1.The production form of this RF signal source is consistent with the training sequence of TD base station system, but amplitude calibration value needs to revise, and can arrange amplitude calibration Zhi is herein – A.In addition, the sigtnal interval of each swept-frequency signal can be arranged flexibly according to the tested bandwidth of RRU passage and the requirement of frequency resolution.
Step 2: by the RF swept signal source generated in step 1, once launch in the training sequence mode of TD base station system.
Step 3: have non-linear equipment because RRU inside contains such as power amplifier etc., therefore, in order to reflect their operating state more accurately, improve the accuracy measured, need to detect the power output of RRU, namely OPD data capture.
Step 4: by the RRU reflection power detection of grasping system under short circuit, open circuit and matched load state respectively, i.e. RPD data.The main purpose of carrying out this step is to use above-mentioned single port collimation technique to obtain systematic error D, R, S, and then calibrates system.Therefore, in order to improve measurement efficiency, save Measuring Time, can be stored in the memory of RRU internal system by calibration data D, R, S of the RPD data acquisition of system under short circuit, open circuit and matched load, as in EEPROM (Electrically Erasable Programmable Read-Only Memory, EEPROM (Electrically Erasable Programmable Read Only Memo)) or other memories.After processing like this, the RPD that standing-wave ratio detection in outfield need not all be carried out under short circuit, open circuit and matched load state at every turn detects, then carries out the calculating of systematic error.The substitute is and these three kinds of calibration data are directly read, therefore saved plenty of time and cost.
Step 5: by RRU device under test (DUT), as antenna, carry out the crawl of RPD data.
Step 6: data-signal process is carried out to all data (comprising OPD and RPD) grabbed by RRU.Because the RF swept-frequency signal generated in step 1 belongs to baseband signal, so its feedback signal carries stronger DC component, therefore, first need to carry out DC processing to them.After this, also need to carry out calibration process to the image signal in primary signal, thus reject the interference signal in feedback signal.
Step 7: the RRU in base station system certainly exists the time delay in time and phase place for the collection of feedback signal (OPD and RPD).Mode based on vector measurement includes the phase information of signal, therefore must carry out synchroballistic process to the signal collected.By the time-frequency characteristic analysis to feedback signal, contrast general multitone and pseudo random sequence, can find that RF swept-frequency signal has better autocorrelation performance.Specifically can with reference to of the present invention a kind of OPD and the RPD time-domain signal without synchronous process shown in Fig. 6, with of the present invention a kind of OPD and the RPD time-domain signal after synchronous process shown in Fig. 7, respectively illustrate OPD and the RPD time-domain signal characteristic before and after synchronous process.
Step 8: from the feedback signal captured, the swept-frequency signal of each resident frequency of stage extraction respectively, is namely extracted in the tone signal realized in certain bandwidth.Such as, within the scope of certain bandwidth B, realize swept-frequency signal, swept-frequency signal be spaced apart G, then the swept-frequency signal quantity in this length of tape is wide is T=B/G.The wherein data length of the dwell length of each root swept-frequency signal to be L/T, L be actual signal.
Step 9: respectively FFT conversion is carried out to the swept-frequency signal extracted in step 8, obtain the frequency domain character figure of signal, now then can solve the peak-peak of the wide interior signal of this length of tape.This peak-peak is applied to the reflection coefficient of computing system in subsequent step.
Step 10: the peak value utilizing each feedback signal calculated in step 9, respectively for its reflection parameters of calculated signals of short circuit, open circuit, coupling and Devices to test.The reflection parameters now calculated is the reflection parameters containing systematic error.
Step 11: use the single port calibration steps computing system error D of above-mentioned vector network analyzer, R, S.Wherein M1, M2, M3 are in step 4 by system RPD signal under short circuit, open circuit and matched load state that RRU captures.
Step 12: utilize the systematic error drawn in step 11 to calibrate the error existed in RRU system, and utilize formula
calculate accurate reflection coefficient, namely eliminate in RRU system due to system intrinsic error that the devices such as circulator bring.
Step 13: the accurate reflection coefficient using each section of swept-frequency signal obtained in step 12, the average reflection coefficient of computing system in prescribed bandwidth.
Step 14: so far, the standing-wave ratio in system bandwidth can utilize aforementioned formula
calculate.
14 above-mentioned steps describe the realization flow of the standing-wave ratio detecting method based on vector calibration technology in detail.It should be noted that, these detailed steps are realization flows of whole detection method and device, but in the application of reality, owing to storing the calibration data in RRU system, do not need to recalculate, therefore all about short circuit in above-mentioned steps, open circuit, matched load and the operation such as computing system error D, R, S all can be omitted, and this makes the present invention more convenient in actual applications.
The practical application flow process of the present invention after omitting the calculating of the process of short circuit, open circuit, matched load RPD data and systematic error D, R, S is with reference to the applicating flow chart of of the present invention a kind of standing-wave ratio detecting method based on vector calibration technology in actual environment shown in Fig. 8.Due to Fig. 5 basic simlarity, therefore not repeated at this.
A kind of RRU standing-wave ratio detecting method based on vector measurement technology that the embodiment of the present invention proposes and device mainly have following several respects advantage compared to prior art.
The first, SWR measurement precision is high.
The method that the embodiment of the present invention proposes is applied to existing base station system not to be needed to increase extra hardware cost, only need to utilize a small amount of DSP of base station system (Digital Signal Processor, digital signal processor) computational resource just can realize high-precision base station standing-wave ratio measuring ability.The base station worked under an actual environment uses the method to carry out validation test to the standing-wave ratio of RRU, the mismatched load of standard is employed in test, then the method utilizing the embodiment of the present invention to propose carries out the calculating of system standing-wave ratio, the result that the result of calculation of its embodiment of the present invention and vector network analyzer (VNA) are tested compares, and the comparison result that the method that specifically can propose with reference to the embodiment of the present invention shown in table 1 and VNA test is listed 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 test result of the standing-wave ratio testing result that the standing-wave ratio detecting method that the application embodiment of the present invention proposes obtains and VNA is the equipment of 3.0 and 1.5 for standard mismatched load, and its standing-wave ratio only differs 0.091 and 0.05 respectively.Thus, can prove that method that the embodiment of the present invention proposes is effective and accurate.
Use the standing-wave ratio detecting method that the embodiment of the present invention proposes, BTS hardware is safeguarded and testing staff, when carrying out base station equipment standing-wave ratio and detecting operation, do not need to carry heavy expensive instrument, do not need all to carry out the calibration of loaded down with trivial details short circuit, open circuit and matched load at every turn yet, but only utilize the calibration data being stored in RRU internal storage (as E2PROM), just can realize the accurate standing-wave ratio measuring ability of base station system.
Certainly, if conditions permit, also or can cut off the time just to calculating primary calibration data, the embodiment of the present invention is not restricted this at every turn.
The second, SWR measurement result is stablized.
The application embodiment of the present invention, standing-wave ratio result of calculation is comparatively stable.By the calibration to systematic error, the embodiment of the present invention can not by the impact of RRU its exterior environmental change.Such as, when calibration plane is in RRU port respectively and adds extra RF cable and attenuator in RRU port, relative to scalar detection method, the standing-wave ratio testing result change that the embodiment of the present invention obtains is minimum, the method that specifically can propose with reference to the embodiment of the present invention shown in table 2 and the testing result of scalar detection method when RRU external environment condition changes.
Table 2:
As can be seen from Table 2, adopt scalar detection method calibration plane be RRU port and 1 meter of radio frequency line+attenuator when, for the equipment that standard mismatched load is 3.0 and 1.5, its standing-wave ratio differs 16.2029 and 0.4510 respectively, it can thus be appreciated that the standing-wave ratio fluctuation adopting scalar detection method to measure is larger.And adopt the method for the embodiment of the present invention, calibration plane be RRU port and 1 meter of radio frequency line+attenuator when, for the equipment that standard mismatched load is 3.0 and 1.5, its standing-wave ratio differs 0.0034 and 0.2744 respectively, be easy to learn, compared with scalar detection method, fluctuate less, testing result is stablized, accurately.
It should be noted that, for embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the application is not by the restriction of described sequence of movement, because according to the application, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action might not be that the application is necessary.
With reference to Fig. 9, show the structured flowchart of the device embodiment that a kind of remote radio unit (RRU) RRU standing-wave ratio of the present invention detects, can store calibration data in described RRU, described device can comprise as lower module:
Generation module 201, for generating swept-frequency signal;
First transmitter module 202, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
First handling module 203, the reflection power for adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
First computing module 204, for detecting RPD feedback data and power output detection OPD feedback data computational reflect parameter according to described reflection power;
In one preferred embodiment of the invention, described first computing module 204 can comprise:
Calibration submodule, detects for adopting described power output after OPD feedback data carries out Phase synchronization to described reflection power detection RPD feedback data and operates;
Segmentation captures submodule, to detect RPD feedback data extract tone signal for segmentation from the reflection power of each preset resident frequency after described Phase synchronization;
Peak value obtains submodule, for obtaining peak-peak according to described tone signal;
Reflection parameters calculating sub module, for adopting described peak-peak and computational reflect parameter.
In one preferred embodiment of the invention, described peak value acquisition submodule comprises:
Converter unit, obtains frequency domain character figure for carrying out fast Fourier transform FFT to described tone signal;
Peak value computing unit, for calculating the peak-peak in nominated bandwidth from described frequency domain character figure.
Second computing module 205, calculates accurate reflection coefficient for adopting the calibration data in described reflection parameters and described RRU;
In one preferred embodiment of the invention, described calibration data can comprise directional error D, skin tracking error R, and source mismatch error S, and described device can also comprise:
Second transmitter module, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
Second handling module, detects RPD feedback data for the reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively;
5th computing module, for adopt described when short circuit, open circuit, load matched the reflection power of described Devices to test detect RPD feedback data and calculate described directional error D, skin tracking error R, and source mismatch error S.
3rd computing module 206, for adopting the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
4th computing module 207, calculates standing-wave ratio for adopting described average reflection coefficient.
For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Those skilled in the art should understand, the embodiment of the application can be provided as method, device or computer program.Therefore, the application can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the application can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The application describes with reference to according to the flow chart of the method for the embodiment of the present application, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although described the preferred embodiment of the application, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Above to the method that a kind of remote radio unit (RRU) RRU standing-wave ratio provided by the present invention detects, and, the device that a kind of remote radio unit (RRU) RRU standing-wave ratio detects, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a method for remote radio unit (RRU) RRU standing-wave ratio detection, store calibration data in described RRU, it is characterized in that, described method comprises:
Generate swept-frequency signal;
Preset training sequence is adopted to launch described swept-frequency signal to Devices to test;
The reflection power adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
RPD feedback data and power output detection OPD feedback data computational reflect parameter is detected according to described reflection power;
The calibration data in described reflection parameters and described RRU is adopted to calculate accurate reflection coefficient;
Adopt the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
Described average reflection coefficient is adopted to calculate standing-wave ratio.
2. method according to claim 1, is characterized in that, described calibration data comprises directional error D, skin tracking error R, and source mismatch error S, and described calibration data obtains in the following way:
Preset training sequence is adopted to launch described swept-frequency signal to Devices to test;
The reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively detects RPD feedback data;
Adopt the reflection power of the described described Devices to test when short circuit, open circuit, load matched to detect RPD feedback data and calculate described directional error D, skin tracking error R, and source mismatch error S.
3. method according to claim 1, is characterized in that, the described step according to described reflection power detection RPD feedback data and power output detection OPD feedback data computational reflect parameter comprises:
Adopt described power output to detect OPD feedback data and Phase synchronization operation is carried out to described reflection power detection RPD feedback data;
Segmentation detects RPD feedback data from the reflection power of each preset resident frequency after described Phase synchronization and extracts tone signal;
Peak-peak is obtained according to described tone signal;
Adopt described peak-peak and computational reflect parameter.
4. method according to claim 3, is characterized in that, the described step according to described tone signal acquisition peak-peak comprises:
Fast Fourier transform FFT is carried out to described tone signal and obtains frequency domain character figure;
The peak-peak in nominated bandwidth is calculated from described frequency domain character figure.
5. method according to claim 1, is characterized in that, described Devices to test is antenna.
6. a device for remote radio unit (RRU) RRU standing-wave ratio detection, store calibration data in described RRU, it is characterized in that, described device comprises:
Generation module, for generating swept-frequency signal;
First transmitter module, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
First handling module, the reflection power for adopting described RRU to capture described Devices to test detects RPD feedback data and power output detects OPD feedback data;
First computing module, for detecting RPD feedback data and power output detection OPD feedback data computational reflect parameter according to described reflection power;
Second computing module, calculates accurate reflection coefficient for adopting the calibration data in described reflection parameters and described RRU;
3rd computing module, for adopting the average reflection coefficient in described accurate reflection coefficient calculations nominated bandwidth;
4th computing module, calculates standing-wave ratio for adopting described average reflection coefficient.
7. device according to claim 6, is characterized in that, described calibration data comprises directional error D, skin tracking error R, and source mismatch error S, and described device also comprises:
Second transmitter module, launches described swept-frequency signal to Devices to test for adopting preset training sequence;
Second handling module, detects RPD feedback data for the reflection power adopting RRU to capture the described Devices to test when short circuit, open circuit, load matched respectively;
5th computing module, for adopt described when short circuit, open circuit, load matched the reflection power of described Devices to test detect RPD feedback data and calculate described directional error D, skin tracking error R, and source mismatch error S.
8. device according to claim 6, is characterized in that, described first computing module comprises:
Calibration submodule, detects OPD feedback data for adopting described power output and carries out Phase synchronization operation to described reflection power detection RPD feedback data;
Segmentation captures submodule, to detect RPD feedback data extract tone signal for segmentation from the reflection power of each preset resident frequency after described Phase synchronization;
Peak value obtains submodule, for obtaining peak-peak according to described tone signal;
Reflection parameters calculating sub module, for adopting described peak-peak and computational reflect parameter.
9. device according to claim 8, is characterized in that, described peak value obtains submodule and comprises:
Converter unit, obtains frequency domain character figure for carrying out fast Fourier transform FFT to described tone signal;
Peak value computing unit, for calculating the peak-peak in nominated bandwidth from described frequency domain character figure.
10. device according to claim 6, described Devices to test is antenna.
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