CN101605350A - Based on multiple wireless access technology space Performance Test System and method of testing thereof - Google Patents
Based on multiple wireless access technology space Performance Test System and method of testing thereof Download PDFInfo
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Abstract
Based on multiple wireless access technology space performance (OTA, Over The Air) test macro is used to evaluate and test space performance (OTA) index of wireless terminal device, its principle is by equipment under test is placed three dimensions, and set up and base station simulator (has another name called: the communication link integrated wireless communication tester), control Phi, Theta axle (two mutually perpendicular axles) is by setting the step-length rotation, respectively all angles position is measured, measure travelling carriage at three-dimensional spherical effective isotropic radiated power (TRP, Total Radiated Power) and receiver total omnidirectional sensitivity (TIS, Total Isotropic Sensitivity).This system mainly is made of the main control terminal computer of darkroom, high-accuracy position system and controller thereof (comprising rotating shaft controller and polarization controller), radio frequency testing instrument and equipment and band autotest program.Main radio frequency instrument and equipment has integrated wireless communication tester (hereinafter to be referred as " wireless comprehensive test instrument "), spectrum analyzer, network analyzer and radio frequency unit.
Description
Technical field
The present invention relates to a kind of test macro, relate more specifically to a kind of based on multiple wireless access technology space Performance Test System and the method for utilizing this system to test.
Background technology
(1) non-source test of portable terminal and active test
What the current test of more and more paying close attention to the complete machine radiance in the mobile terminal radio frequency performance test, this radiance had reflected portable terminal finally transmits and receives performance.Mainly containing two kinds of methods at present investigates the radiance of portable terminal: a kind of is to judge from the radiance of antenna, is present comparatively traditional antenna test method, is called non-source test; Another kind is in specific microwave dark room, and the radiant power of testing mobile terminal and receiving sensitivity are called active test.OTA (Over The Air) test belongs to active test.
The radiance of portable terminal is investigated in the radiation parameter aspect that non-source test stresses antennas such as the gain, efficient, directional diagram from mobile terminal antenna.Though non-source test has been considered the influence of complete machine environment (such as the antenna peripheral devices, uncap and close lid) to antenna performance, but final radiated transmission power and receiving sensitivity be how after cooperating with complete machine for antenna, can't learn directly that from the non-source test data test data is not directly perceived.
Active test then stresses from the radiance of the transmitting power of portable terminal complete machine and receiving sensitivity aspect investigation portable terminal.Active test is to test transmitting power and the receiving sensitivity of complete machine in the three dimensions all directions, the more directly radiance of reflect mobile terminal complete machine in specific microwave dark room.CTIA has formulated the relevant criterion of OTA (Over The Air).The test of complete machine radiance aspect is carried out in the OTA test emphatically, and becomes the test event that portable terminal manufacturer payes attention to and approves gradually.
(2) purpose of OTA test
When mobile terminal call, because human brain near mobile terminal antenna, will reduce the performance that transmits and receives of portable terminal, the transmitting and receiving performance and all can reduce of portable terminal complete machine radiation.In the portable terminal R﹠D process, answer the transmit and receive Effect on Performance of quantitative measurment human brain, be optimized design portable terminal, make transmit and receive that performance reduces can not be too big, promptly reduce the electromagnetic coupling effect of human body and antenna.
For investigating the radiance of portable terminal, except the passive performance of investigating mobile terminal antenna, the active performance of complete machine also is an important investigation aspect.The active performance of current complete machine more and more is subjected to the attention of manufacturer terminal, therefore two kinds of radiances should be integrated consideration in the investigation of mobile terminal radiating performance.Terminal antenna manufacturer generally all requires the antenna provision merchant that passive and active test report is provided in research and development at present.
(3) OTA of CTIA authentication test test leading indicator, method of measurement and pluses and minuses
OTA mainly measures radio-frequency (RF) index:
1) total radiant power (TRP:Total Radiated Power)
2) antenna radiation pattern figure, directivity is near the partial power (NHPRP:Nea rHorizon Partial Radiated Power) of horizontal plane
3) antenna efficiency (TRP is divided by the power output of PA)
4) total omnidirectional sensitivity (TIS:Total Isotropic Sensitivity)
5) the local receiving sensitivity (NHPIS:Near Horizon PartialIsotropic Sensitivity) of close horizontal plane
The OTA advantage:
1) integrated survey the performance of terminal with antenna
2) TRP and TIS have simulated the situation of the actual use of close human body head
3) OTA is radiation and the receptivity that three-dimensional 3D investigates terminal
The OTA shortcoming:
1) test is slow and complicated
2) cost height
The TRP method of testing: by the position of control dut terminal, at the Effective Radiated Power EIRP of inboard two points of 3d space, by the mean value on the integral and calculating sphere, each anglec of rotation of dut terminal is 15 degree.
The TIS method of testing: by the position of control dut terminal, at the space receiving sensitivity EIS of inboard two points of 3d space, by the mean value on the integral and calculating sphere, each anglec of rotation of dut terminal is 30 degree.
(4) development of OTA test
Mobile terminal antenna is very important to the influence of the actual transmission of complete machine and receptivity.From in August, 2004, the OTA test plan of CTIA is adopted as its authentication specifications in the North America, and the PTCRB of portable terminal application North America authentication must be tested by OTA.GCF organizes and is also considering to include it in test request.The CTIA of the U.S. is unique tissue of formulating the OTA testing standard.Simultaneously, also there is other tissue to participate in the test in this field, mainly contains PTCRB (PCS Type CertificationReview Board), 3GPP (3G Partner Project) and COST 273.Have only by the portable terminal of OTA test and could sell in North America market in the North America, countries such as present Eurasia also more and more pay attention to OTA test importance, launch the work of dependence test laboratory construction in succession.In Chinese OTA test also is not a compulsory testing standard at present, but according to present trend, the OTA test more and more becomes the test data that the portable terminal manufacturer terminal is valued.
(5) OTA test major parameter introduction and correlation computations
In the OTA test, the radiance parameter mainly is divided into two classes: emission parameter and reception parameter.Emission parameter has TRP, NHPRP; Receive parameter TIS, NHPIS are arranged.TRP (Total Radiated Power): obtain by the transmitting power of whole radiation sphere being carried out the area branch and being averaged.The transmitting power situation of its reflect mobile terminal complete machine, relevant with the transmitting power of portable terminal under the conduction situation with antenna radiation performance.
NHPRP (Near Horizon Partial Radiated Power): the parameter that is reflected near the transmitting power situation of the antenna H face of portable terminal.
TIS (Total Isotropic Sensitivity): the situation that is reflected in whole radiation sphere portable terminal receiving sensitivity index.It has reflected the receiving sensitivity situation of portable terminal complete machine, and is relevant with the radiance of the conducted susceptibility of portable terminal and antenna.
Near NHPIS (Near Horizon Partial Isotropic Sensitivity): the parameter of reflect mobile terminal receiving sensitivity situation of the antenna H face.
For handheld terminal, also will investigate terminal at the above-mentioned parameter that has under the phantom bead situation in the OTA test, relatively in the situation of change that has or not relevant parameter under the phantom bead situation.
Summary of the invention
In view of this, it is a kind of based on multiple wireless access technology space performance (OTA, Over The Air) test macro that main purpose of the present invention is to provide, and it is characterized in that comprising:
Wireless comprehensive test instrument, anolog base station transmits, TRP (Total Radiated Power, total radiant power) is used in the measurement being connected with tested foundation calling, during measuring, TIS (Total IsotropicSensitivity, total omnidirectional sensitivity) sets error rate level to tested wireless device is reached by the transmitting power of successively decreasing;
Network analyzer is used for the S parametric calibration to horizontal antenna and vertical antenna;
Spectrum analyzer is used to receive the maximum power that equipment under test is launched in TRP (Total Radiated Power, total radiant power) measures;
Rotating shaft controller, control combination axle system are pressed the rotation of test program required angle, make test to carry out on the specified point of ball-type system;
Turntable, what be used to control measured object horizontally rotates angle Theta angle, promptly measurement point and+angle between the Z axle;
Polarization controller is used to control the polarization selection of test;
Measure antenna, be used for and equipment under test between set up communication link;
Radio frequency unit, by radio frequency cable, connect each hardware cell and by test request control each hardware cell break-make, make the test macro can operate as normal;
Main control terminal PC moves automatic supervision test software, by gpib bus (General-PurposeInterface Bus, general-purpose interface bus) above-mentioned programmable instrument is realized control.
According to a preferred embodiment of the invention, described radio frequency unit comprises:
Radio-frequency (RF) switch is used for the switching between each test access of airborne performance test;
Attenuator is used for the high-power signal decay to input, and the protection tester is not burnt; And
The radio-frequency (RF) switch controller, by gpib bus (General-Purpose Interface Bus, general-purpose interface bus) receive the instruction that PC sends, the unlatching of control radio-frequency (RF) switch is selected different test accesss with closure state, finishes the test access selection function.
According to a preferred embodiment of the invention, described wireless comprehensive test instrument is that CMU200 is (for GSM, CDMA, WCDMA, CDMA2000) or CBT32 (BlueTooth) or SP6010 (TD-SCDMA) or WIMAX (AGILENT E6651A Mobile WiMAX tester).
According to a preferred embodiment of the invention, described spectrum analyzer is R﹠amp; The FSU spectrum analyzer of S company.
According to a preferred embodiment of the invention, described radio frequency unit is R﹠amp; The RSP-BRF+RSP-EMI of S company.
According to a preferred embodiment of the invention, the described network analyzer E8362B that is Agilent company.
Space performance (OTA) test of multiple wireless access technology can be contained according to of the present invention based on multiple wireless access technology space performance (OTA) test macro comprehensively, and the automation tested can be realized to greatest extent.Its covering scope is wide, and test-types is complete; The automaticity height, simple to operate, friendly interface; Flexible configuration is easy to upgrade with the modification of test establishing criteria; The measuring accuracy height; System possesses good maintainability and extensibility.
Though will describe the present invention in conjunction with some exemplary enforcements and using method hereinafter, and it will be appreciated by those skilled in the art that to not being intended to the present invention is limited to these embodiment.Otherwise, be intended to cover all substitutes, correction and the equivalent that are included in defined spirit of the present invention of appending claims and the scope.
Other advantages of the present invention, target, to set forth in the following description to a certain extent with feature, and to a certain extent,, perhaps can obtain instruction from the practice of the present invention based on being conspicuous to those skilled in the art to investigating hereinafter.Target of the present invention and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
Fig. 1 is according to the block diagram based on multiple wireless access technology space performance (OTA) test macro of the present invention;
Fig. 2 shows the connection diagram according to radio frequency unit of the present invention;
Fig. 3 shows the typical sphere coordinate system;
Fig. 4 shows spherical coordinate system polarised direction schematic diagram;
Fig. 5 (a), Fig. 5 (b) show according to exemplary distribution axle system and built-up shaft system;
Fig. 6 shows headform's orientation diagram;
Fig. 7 shows travelling carriage free space coordinate system;
Fig. 8 shows travelling carriage headform coordinate system;
Fig. 9 shows the block diagram of TRP test macro;
Figure 10 shows the block diagram of TIS test macro;
Figure 11 shows testing system software general structure block diagram;
Figure 12 shows the overall flow figure of testing system software;
Figure 13 shows the flow chart of test receiver sensitivity TRP;
Figure 14 shows the flow chart of test receiver sensitivity TIS;
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.It should be noted that the execution mode based on multiple wireless access technology space Performance Test System and method of testing thereof according to the present invention as just example, but the invention is not restricted to this embodiment.
(1) system constitutes and test philosophy
Referring to Fig. 1, test system hardware mainly comprises:
Wireless comprehensive test instrument: anolog base station transmits, and is used for during TRP measures being connected with tested foundation calling, sets error rate level by the transmitting power of successively decreasing to mobile radio station is reached during TIS measures.
For different category of tests, need to select different comprehensive test instruments, for GSM, CDMA, WCDMA, R﹠amp is selected in the test of CDMA2000; The CMU200 of S company, the built-in GSM of CMU200, CDMA, WCDMA, the test module of CDMA2000 can provide good support to these wireless access technologys, and excellent performance, and is reliable and stable.For BlueTooth, then adopt R﹠amp; The CBT32 type wireless comprehensive test instrument of S company.
Network analyzer is used for the S parametric calibration to horizontal antenna and vertical antenna;
Spectrum analyzer: spectrum analyzer only uses in RF radiation power is measured, and is used to receive the maximum power of equipment under test emission, need not in the receiver performance test.
Power-measuring device mainly contains spectrum analyzer and power meter, and it can directly be controlled relevant parameter and satisfy the requirement of different communication signal power measurement.Because the broadband response of power meter probe is difficult to power of reverse link and forward power are isolated, and does not therefore recommend to use power meter to make the power-measuring device of this test.
Radio frequency unit: by radio frequency cable, connect each hardware cell and by test request control each hardware cell break-make, make the test macro can operate as normal.Described radio frequency unit comprises: radio-frequency (RF) switch is used for the switching between each test access of airborne performance test; Attenuator is used for the high-power signal decay to input, and the protection tester is not burnt; And radio-frequency (RF) switch controller, by gpib bus (General-Purpose Interface Bus, general-purpose interface bus) receive the instruction that PC sends, the unlatching of control radio-frequency (RF) switch is selected different test accesss with closure state, finishes the test access selection function.
The rotating shaft controller: the control combination axle system is pressed the rotation of test program required angle, makes test to carry out on the specified point of ball-type system.
Turntable, what be used to control measured object horizontally rotates angle Theta angle, promptly measurement point and+angle between the Z axle;
Polarization controller: because test macro is divided into single polarization and two kinds of test case of dual polarization, polarization controller just is used to control the polarization selection of test.
Measure antenna: be used for transmitting and sending transmitting of comprehensive test instrument of receiving mobile.Wherein a kind ofly be used for connecting, a kind ofly be used for the power signal that mobile terminal receive is launched with portable terminal.
Main control terminal PC: computer, move automatic supervision test software, by gpib bus programmable instrument is realized control, be the maincenter of whole test system.
Figure 2 shows that radio frequency unit internal switch and attenuator connection diagram.The selection of its internal switch make position has determined the link of signal, and the make position of concrete switch and the selection of link are as shown in the table:
| Port one | Switch closed position | Port 2 | Signaling link function is described |
| Signal generator | ?K33(2)(C) | The turntable boresight antenna | The output of link Insertion Loss calibrating signal |
| The network analyzer output port | ?K33(6)(C) | The turntable boresight antenna | The output of link S parametric calibration signal |
| The network analyzer input port | ?K25(C)(NO)K23(NO)(C) | The vertical survey antenna | The input of vertical survey antenna S parametric calibration signal |
| The network analyzer input port | ?K25(C)(N)K24(NO)(C) | The horizontal survey antenna | The input of horizontal survey antenna S parametric calibration signal |
| The spectrum analyzer input port | ?K22(NO)(C)K31(C)(1)K23(NC)(C) | The vertical survey antenna | The transmission of TRP test vertical survey antenna power |
| The spectrum analyzer input port | ?K22(NO)(C)K31(C)(2)K24(NC)(C) | The horizontal survey antenna | The TRP testing level is measured the antenna power transmission |
| The wireless comprehensive test instrument output port | ?K21(C)(NC)K22(NC)(C)K31(1) ?K23(NC)(C) | The vertical survey antenna | The TIS test perpendicular polarization path that transmits |
| Wireless comprehensive test | ?K21(C)(NC)K22(NC)(C)K31(2) | Horizontal survey | The TIS testing level |
| The instrument output port | ??K24(NC)(C) | Antenna | The path that transmits polarizes |
| The wireless comprehensive test instrument output port | ??K21(C)(NO) | Communication antenna TX/RX | The TRP testing base station path that transmits |
| Wireless comprehensive test instrument is defeated as port | The 20dB attenuator | Communication antenna TX/RX | TRP testing base station received signal path |
Figure 3 shows that the typical sphere coordinate system, wherein: Phi (φ) axle is the Z axle, the Theta angle be defined as measurement point and+angle between the Z axle, the Phi angle be defined as measurement point the projection on the XY plane and+angle between the X-axis.Defined after the spherical coordinate system, defined two orthogonal polarization directions of each measurement point, as shown in Figure 4: the direction of motion the when direction of motion when the Phi polarised direction is defined as the rotation of Phi axle, Theta polarised direction are defined as the rotation of Theta axle.
For ease of test,, define two kinds of navigation systems: distribution axle system and built-up shaft system based on spherical method of testing.The distribution axle system is meant that two rotating shafts are separate, and referring to Fig. 5 (a), measure antenna and rotate around the Theta axle this moment, and EUT rotates around the Phi axle.Two rotating shafts of built-up shaft system are together with each other, and referring to Fig. 5 (b), are to install the Phi axis positioner additional on Theta axis positioner basis at this moment, and EUT is simultaneously around two axle rotations.
Based on above two kinds of navigation systems, corresponding built-up shaft system, definition great circle cutting method is measured scan method:
Measure antenna and maintain static this moment, and travelling carriage rotates according to a definite sequence on two normal axis.Great circle cutting method cutting method and measurement data points, are tested under following two kinds of situations respectively according to the EUT type referring to Fig. 6 (based on 30 degree step-lengths):
A free space: when EUT is non-portable set, only need carry out the test under the free space.This moment, EUT placed the turntable top, and the center of three-dimensional rotation axle is travelling carriage receiver position, and the receiver location definition is referring to IEEE-1528.Figure 7 shows that the coordinate system of travelling carriage under the free space test condition.Wherein, the vertical major axis of travelling carriage is the Z axle, right-hand rule definition X and Y-axis.
B headform: when EUT is portable set, except that needs carry out test under the free space, also need to carry out the test under the headform.At this moment, the headform places the turntable top, and EUT is close to the headform.Because the data that EUT measures under two kinds of situations of headform's left and right sides ear may be different, thus test respectively in both cases required, as shown in Figure 8.
For carrying out number of people simulation test, also need to meet the headform of CTIA standard.
Fig. 9 shows the block diagram of TRP test macro; Figure 10 shows the block diagram of TIS test macro; In order to finish whole spherical scanning, travelling carriage not only will also need to rotate around the Phi axle around the rotation of Theta axle.
Test is carried out in full electric wave antenna darkroom, and tested mobile terminal pivot and the distance of measuring between the antenna phase center must be greater than minimum test distance R, and the whole measuring system uncertainty needs less than 2dB.Tested mobile terminal support fixture structure must be able to satisfy carries out the requirement of totally 3 kinds of test conditions of free space, headform, left and right sides ear to travelling carriage, and uses the radio frequency transparent material.
The far field test condition of antenna measurement need be satisfied in the darkroom, a certain size dead zone is arranged and satisfy the requirement of overall uncertainty less than 2dB.The rotating shaft controller is the navigation system of tested mobile terminal.The rotating shaft controller makes tested mobile terminal be rotated at whole sphere as shown in Figure 4, satisfies the high accuracy three-dimensional location.
Each radio frequency instrument, rotating shaft controller communicate by gpib interface with the PC of band automatic testing software.
To sketch below based on multiple wireless access technology space performance (OTA) test macro management software General layout Plan.
Systems soft ware is to use Visual C++6.0 application development environment as developing instrument, automatically supervision test software can replace artificial direct control to instrument, effectively guidance system is carried out the test-types selection, initial configuration, according to test specification whole system is carried out control and management, realize that test process carries out in order, and measurement result is analyzed, handled and preserves.Portability and extensibility in order to strengthen program adopt modular programming idea, each independently funtion part make dynamic link library.Software is divided into three-tier architecture, as shown in figure 11.
The set that the test instrumentation Driver Library is made up of a plurality of independently instrument drive storehouse, every kind of corresponding self contained instrument Driver Library of test instrumentation; 2 partial functions are realized in the instrument drive storehouse: provide the test parameter function of initializing of instrument and test command to carry out function.The instrument initialization section comprises 3 functional modules:
1. built-in initiation parameter set: the general operation according to instrument is provided with, and makes the beginner needn't possess professional knowledge, just can operate.
2. parameter is provided with interface: advanced level user can test needs flexible configuration parameter according to reality, to reach better test effect.
3. instrument initialization:, instrument is returned to the set state of parameter according to the parameter of final setting.
Test command is carried out function and is comprised 2 functional modules:
1. test function set: have several test function modules in this set, each module integrated a series of test command is finished 1 specific test process.Like this, the beginner need not be concerned about the specific implementation step of instrument, just can operate, and realizes test function.
2. universal test command interface: this interface provides for advanced level user, and the user needs the imperative structures and the parameter of detail knowledge instrument, and own compound command sequence is finished self-defining operation.
The test process control section has been realized the control to 3 measuring technologies, is respectively PatternMeasurement, Scalar (pattern measurement, scalar); Pattern Measurement, Sensitivity (pattern measurement, sensitivity); Pattern Measurement, Cal (pattern measurement, calibration); Each measuring technology all realizes 4 kinds of Mode S ADP (single shaft dual polarization), SASP (single shaft single polarization), TADP (twin shaft dual polarization), TASP (twin shaft single polarization); As shown in figure 16.Its implementation procedure is: call the equipment orchestration that UI selects, the initialization apparatus state; Read the configuration information of UI (user interface), select suitable measuring technology item; Judge the test parameter (frequency and rotating shaft speed, whether step-length etc. are legal) that UI is provided with; Begin test, and give UI the test result real-time update.
UI is a window, and all test setting, operation, result will have visual representing in UI.
UI realizes following several partial functions:
1, test event is selected;
2, the instrument drive storehouse is selected, and the Driver Library initiation parameter is provided with;
3, test parameter setting (comprising test frequency, rotating shaft speed, step-length);
4, check value management;
5, test control;
6, test result shows (form, broken line graph, three kinds of forms of 3D figure);
7, test data is preserved (parameter is preserved, and the result preserves);
8, historical data is reproduced;
Figure 12 shows the overall flow figure of testing system software.
(2) mobile station testing project and step
A. transmitter RF radiation power TRP measures
As shown in figure 13, measure the radio-frequency radiation performance that travelling carriage EIRP weighs EUT (equipment under test, Equipment Under Test) by diverse location around the travelling carriage sphere.As shown in figure 14, this test is assessed Effective Radiated Power by the measurement data of analyzing each measurement point on the sphere, obtains the three-dimensional radiation characteristic of EUT.The Theta of spherical coordinates axle and Phi axle respectively at interval 15 degree get 1 measurement point, far-field radiation pattern and the total radiant power of EUT promptly can fully be described.Owing to when θ=0 degree and θ=180 are spent, need not test,, all measurement results are integrated into total radiant power (TRP) according to equation A-1 so each polarization needs 264 points of measurement.
Power-measuring device is a spectrum analyzer, satisfies the requirement of different communication signal power measurement because it can directly control relevant parameter.The peak signal strength that frequency spectrograph receives will be higher than background noise 40dB at least.Adjust the reference level and the pad value of frequency spectrograph, make the peak signal of reception show the low at least 5dB of grid maximum than spectrum analyzer.In order to satisfy the characteristic requirement of different modulated signals, frequency spectrograph should be supported the adjustment function of sweep time and test data point.Frequency spectrograph is used for carrying out soft, the hardware of data analysis and must supports the digital signal corresponding analytic function to obtain required result.Unless noted otherwise, the mode of operation of EUT should be the conversation and with maximum power transmission.To supporting the EUT of multiple standard, each standard all should be tested.
Measuring process is as follows:
Requirement according to test specification is provided with parameter, and as corresponding CDMA, test specification is TIA/EIA-98-D, connects between travelling carriage and base station simulator, adjusts the travelling carriage radio frequency power output to maximum.In EUT is frequency bands supported, select high, medium and low three different channels to test, power control signal is made as " Always Up " and can makes travelling carriage after several milliseconds, launch maximum power.
By test specification the minimum residence time of spectrum analyzer, triggering mode, sweep bandwidth, resolution bandwidth, video bandwidth are set.Received signal must be stablized, all data points should be worth therein ± the 0.5dB scope in, the detection that spectrum analyzer adopts is decided according to test specification.
Complete RF radiation power measure be included under free space and two kinds of configurations of headform (if being suitable for) and antenna is extracted and the two kinds of patterns of withdrawing under (if suitable), carry out the test of all test channel.
For GSM and CDMA standard, the dependence test standard produces, and for the test specification of wireless access technologys such as BlueTooth and WiMAX still among making.
B. receiver performance is measured
As shown in figure 14, weigh the receiver performance of EUT by measuring the minimal forward link power of EUT under certain error rate (BER) or frame error rate (FER) condition.This test is defined under the poorest configuration of EUT receiving sensitivity and tests, and assesses effective receiver sensitivity by the measurement data of analyzing each measurement point on the sphere, obtains the three-dimensional receiver identity of EUT.The θ of spherical coordinates axle and Φ axle respectively at interval 30 degree get 1 measurement point, total receiving sensitivity of EUT promptly can fully be described.Owing to when θ=0 degree and θ=180 are spent, need not test,, all measurement results are integrated into total omnidirectional sensitivity (TIS) according to equation A-4 so each polarization needs 60 points of measurement.
Total omnidirectional sensitivity (TIS) should carry out complete test on frequency bands supported high, medium and low 3 channels of EUT.Remaining intermediate channels also need be carried out the test of relative receiving sensitivity.Because some EUT supports a large amount of intermediate channels, then can with intermediate channels they between ignore accident as long as be not more than 500kHz at interval between two continuous channels of actual measurement this moment.
Non-portable EUT need carry out the test under the free space, and portable EUT also needs to carry out the test under the headform.EUT connects with base station simulator under the test channel and configuration of regulation, and base station simulator record EUT is to the error rate or the frame error rate of its report.Regulate the radio frequency output level of base station simulator, make the error rate of EUT or frame error rate on each spherical measurement point, reach desired value.Bit number of measuring or frame number must be abundant so that the confidence level of the error rate greater than 95%.Because receiver sensitivity measurements has the transmitter RF radiation power to measure accurately, so allow to carry out TIS when testing, Theta axle and Phi axle are spent step-lengths with 30 and are rotated.
Measuring process:
Measure the travelling carriage receiving sensitivity with base station simulator, record reaches 2% and the minimal forward link power of confidence level greater than 95% time when the frame error rate of EUT.Connect on the test channel of regulation, travelling carriage is with maximum power transmission, starts frame error rate FER or error rate BER (according to wireless access way and different) and measures, and measures confidence level that frame number should make frame error rate greater than 95%, and maximum frame number restriction is arranged.When forward direction link power during near sensitivity level, power decline step-length should be not more than 0.5dB.When each test point was made sensitivity measure, the control of the power of base station simulator should be set to " Always Up ".Reduce the base station simulator power output, up to FER rise to 2% or BER rise to 2.44%.The sensitivity test value of all test points should be integrated into total omnidirectional sensitivity (TIS).
Do complete TIS test at frequency bands supported high/medium/low 3 channels of EUT.For intermediate channels, satisfying under the largest interval condition, measure relative receiving sensitivity.
Claims (8)
1. one kind based on multiple wireless access technology space Performance Test System, it is characterized in that comprising:
Wireless comprehensive test instrument, anolog base station transmits, TRP (Total Radiated Power, total radiant power) is used in the measurement being connected with tested foundation calling, during measuring, TIS (Total IsotropicSensitivity, total omnidirectional sensitivity) sets error rate level to tested wireless device is reached by the transmitting power of successively decreasing;
Network analyzer is used for the S parametric calibration to horizontal antenna and vertical antenna;
Spectrum analyzer is used to receive the maximum power that equipment under test is launched in TRP (Total Radiated Power, total radiant power) measures;
Rotating shaft controller, control combination axle system are pressed the rotation of test program required angle, make test to carry out on the specified point of ball-type system;
Turntable, what be used to control measured object horizontally rotates angle Theta angle, promptly measurement point and+angle between the Z axle;
Polarization controller is used to control the polarization selection of test;
Measure antenna, be used for and equipment under test between set up communication link;
Radio frequency unit, by radio frequency cable, connect each hardware cell and by test request control each hardware cell break-make, make the test macro can operate as normal;
Main control terminal PC moves automatic supervision test software, by gpib bus (General-PurposeInterface Bus, general-purpose interface bus) above-mentioned programmable instrument is realized control.
According to claim 1 based on multiple wireless access technology space Performance Test System, it is characterized in that described radio frequency unit comprises:
Radio-frequency (RF) switch is used for the switching between each test access of airborne performance test;
Attenuator is used for the high-power signal decay to input, and the protection tester is not burnt; And
The radio-frequency (RF) switch controller, by gpib bus (General-Purpose Interface Bus, general-purpose interface bus) receive the instruction that PC sends, the unlatching of control radio-frequency (RF) switch is selected different test accesss with closure state, finishes the test access selection function.
3. according to claim 1 and 2 a kind of based on multiple wireless access technology space Performance Test System, it is characterized in that described wireless comprehensive test instrument is CMU200 or CBT32 or SP6010 or AGILENT E6651A Mobile WiMAX tester.
4. according to claim 1 and 2 a kind of based on multiple wireless access technology space Performance Test System, it is characterized in that described spectrum analyzer is R﹠amp; The FSU spectrum analyzer of S company.
According to claim 1-3 each based on multiple wireless access technology space performance (OTA) test macro, it is characterized in that described radio frequency unit is R﹠amp; The RSP-BRF+RSP-EMI of S company.
According to claim 1-3 each based on multiple wireless access technology space performance (OTA) test macro, it is characterized in that described network analyzer is the E8362B of Agilent company.
7. one kind is utilized the described system of claim 1 to carry out the method that multiple wireless access technology space performance total radiant power is measured, and it is characterized in that comprising following steps:
(1) according to the requirement of test specification, carries out the initial setting up of test system and test parameter;
(2) the Theta of travelling carriage spherical coordinates axle and Phi axle respectively at interval 15 degree get 1 measurement point;
(3) θ angle rotation 15 degree, 15 degree are rotated at the φ angle, measure and saving result;
(4) keep the θ angle constant, the φ angle serves as the interval wheel measuring with 15 degree, and saving result;
(5) when 360 degree rotations were finished at the φ angle, it served as to be rotated at interval that the θ angle is continued with 15 degree, repeats above-mentioned steps and saving result.
(6) when 360 degree rotations are finished at the θ angle, change channel, once test and saving result at three channels of this frequency range respectively;
(7) above-mentioned measurement result transfers to main control terminal PC by gpib bus (General-Purpose Interface Bus, general-purpose interface bus), moves automatic supervision test software and carries out correlation computations and demonstration.
8. method of utilizing the described system of claim 1 to carry out multiple wireless access technology space performance total omnidirectional sensitivity is characterized in that comprising following steps:
(1) according to the requirement of test specification, carries out the initial setting up of test system and test parameter.
(2) the Theta of travelling carriage spherical coordinates axle and Phi axle respectively at interval 30 degree get 1 measurement point;
(3) θ angle rotation 30 degree, 30 degree are rotated at the φ angle, measure and saving result;
(4) keep the θ angle constant, the φ angle serves as the interval wheel measuring with 30 degree, and saving result;
(5) when 360 degree rotations were finished at the φ angle, it served as to be rotated at interval that the θ angle is continued with 30 degree, repeats above-mentioned steps and saving result.
(6) when 360 degree rotations are finished at the θ angle, change channel, once test and saving result at three channels of this frequency range respectively;
(7) above-mentioned measurement result transfers to main control terminal PC by general gpib bus (General-Purpose InterfaceBus, general-purpose interface bus), moves automatic supervision test software and carries out correlation computations and demonstration.
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| CNA200910148731XA CN101605350A (en) | 2009-07-01 | 2009-07-01 | Based on multiple wireless access technology space Performance Test System and method of testing thereof |
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| CNA200910148731XA CN101605350A (en) | 2009-07-01 | 2009-07-01 | Based on multiple wireless access technology space Performance Test System and method of testing thereof |
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| CNA200910148731XA Pending CN101605350A (en) | 2009-07-01 | 2009-07-01 | Based on multiple wireless access technology space Performance Test System and method of testing thereof |
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Application publication date: 20091216 |