CN107181547A - The method and apparatus for obtaining MIMO OTA test system center powers - Google Patents
The method and apparatus for obtaining MIMO OTA test system center powers Download PDFInfo
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- CN107181547A CN107181547A CN201710452588.8A CN201710452588A CN107181547A CN 107181547 A CN107181547 A CN 107181547A CN 201710452588 A CN201710452588 A CN 201710452588A CN 107181547 A CN107181547 A CN 107181547A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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Abstract
The invention discloses a kind of method and apparatus of acquisition MIMO OTA test system center powers.Wherein, this method includes：The transmission power of input signal is obtained, wherein, input signal is sent by the signal source of MIMO OTA test systems；Obtain input signal and reach signal attenuation of the darkroom per paths in mulitpath, wherein, darkroom is used to place equipment under test when MIMO OTA test systems test equipment under test；Signal attenuation according to the transmission power of signal source and per paths determines the center power of MIMO OTA test systems.The present invention solve in correlation technique due to reading data dependence channel simulator instrument parameter configuration, cause the technical problem that measurement result is inaccurate.
Description
Technical field
The present invention relates to field of signal processing, MIMO-OTA test system center powers are obtained in particular to one kind
Method and apparatus.
Background technology
Correlation technique MIMO OTA (Multiple Input Multiple Output Over The Air, it is how defeated
Enter multi output over the air) in test system, the forms of expression of all test results be all power-throughput curve or
Person's signal to noise ratio-throughput curve.Therefore for test system and testing system software, calibrate and calculate darkroom center
The power at EUT (Equipment Under Test, Device under test) place is extremely important.
LTE (Long Term Evolution, Long Term Evolution) signal is divided into two kinds of LTE-FDD and LTE-TDD, both
The power testing method of signal is entirely different, in relevant criterion, does not propose how clearly to enter using channel simulator instrument
Row power measurement.Alternatively, due to the complexity of MIMO OTA systems, usual tester needs to set more test ginseng
Number, if test parameter input error, will produce the test result of mistake.
OTA is exactly, with radio transmission ability, target information to be passed by air interface technologies from a side of communication equipment
It is multicast to the method for the opposing party.Traditional SISO OTA tests are the performances for weighing mobile communication terminal transmitting antenna.And MIMO
What OTA tests were weighed is the receptivity of MIMO terminals.
The structure of MIMO OTA test systems is as shown in Figure 1：Test is entered in micro-wave screening darkroom (hereinafter referred darkroom)
OK, darkroom is generally rectangular configuration, and six faces of darkroom inside are covered with absorbing material；In horizontal loops of one rigidity with absorbing material,
Ring radius meets measured object far field condition, is evenly arranged N number of test probe, for transmitting and receiving signal, is communicated with measured object；Water
Turntable is placed in flat ring center, can be with 360 degree of rotations.Calibration in darkroom is realized by vector network analyzer.Measured object passes through
Probe is set up to be connected and receive under the control of integrated wireless communication tester with integrated wireless communication tester outside darkroom to be launched
Data.While measured object receives transmitting data, test software records the measured object parameter of integrated wireless communication tester.It is logical
Cross such a method of testing can detect measured object whether according to be manually set radiation or receive corresponding signal.
On the basis of above-mentioned MIMO OTA test systems, correlation technique sets the center work(of system in the following way
Rate.
1st, input, the output calibration of system are carried out, each paths are obtained from the output end of channel simulator instrument, into darkroom
The loss value (Wanted Path Loss) of the heart, the path number of said system is different according to the configuration of channel model file, leads to
The number on road, it is more that conventional eight dual polarizations probe has 16 paths, different system to might have under configuring, not herein
Repeat.
2nd, before test, selection needs the channel model tested, and inputs the loss value of cable, sets channel
The Average input level parameters (expectation input power) of emulating instrument input port.
3rd, channel simulator instrument desired output power (Expected output level) is read.
4th, with reference to the Wanted Path Loss of each paths obtained before, asked by the power to all paths
With obtain the performance number at darkroom center.
It could be aware that by above-mentioned calculating process, the shortcoming for the center power value that correlation technique is determined mainly has two aspects：
On the one hand, test result is dependent on Average input level parameters (this ginseng of different instrument suppliers set
Several titles may slightly have difference, but function is basically identical) because this parameter can influence the pad value inside channel simulator,
So as to influence the power output that channel simulator is fed back, the setting of this parameter and actual input power value have many large deviations, most
The test result obtained eventually just has corresponding deviation, once tester is inaccurate to this parameter setting, or has other wrong
Operation, will obtain the test data of mistake by mistake, simultaneously because having used channel simulator to measure the function of power output, be
System introduces the uncertainty of channel simulator power measurement function, improves the uncertainty of total system；
On the other hand, because test software can read the power of the output port of channel simulator, therefore channel simulator
The uncertainty of output port power measurement can significantly affect test result, especially such case in LTE-TDD signal measurements.
Because LTE-TDD signals are time division signal, the data readings of channel simulator can over time change and significantly fluctuate, therefore survey
The performance number that examination software is read is inaccurate.
Thus, correlation technique depends on the parameter configuration of instrument in the data and sizable degree of reading, in measurement
Also there is potential defect during LTE-TDD signals.Alternatively, existing scheme brings higher learning cost to tester, increases
Produce the possibility of test errors.
For in correlation technique due to reading data dependence channel simulator instrument parameter configuration, cause measurement result forbidden
Really the problem of, effective solution is not yet proposed at present.
The content of the invention
The embodiments of the invention provide a kind of method and apparatus of acquisition MIMO-OTA test system center powers, with least
Solve correlation technique in due to reading data dependence channel simulator instrument parameter configuration, cause the technology that measurement result is inaccurate
Problem.
One side according to embodiments of the present invention is used to obtain MIMO OTA test system center powers there is provided one kind
Method, including：The transmission power of input signal is obtained, wherein, input signal is sent out by the signal source of MIMO OTA test systems
Go out；Obtain input signal and reach signal attenuation of the darkroom per paths in mulitpath, wherein, darkroom is used in MIMO OTA
Equipment under test is placed when test system is tested equipment under test；Signal according to the transmission power of signal source and per paths
Decay determines the center power of MIMO OTA test systems.
Alternatively, the corresponding loss of input cable per paths is obtained, wherein, input cable is that signal source is imitative to channel
Cable between true instrument；Obtain attenuated inside of the channel simulator instrument in every paths；Channel simulator instrument is obtained to the space in darkroom
Decay.
Alternatively, the signal attenuation according to the transmission power of signal source and per paths, obtains the performance number per paths；
According to the performance number of every paths, the center power of MIMO OTA test systems is obtained.
Alternatively, the performance number per paths is obtained by equation below：Pm=S+TotalChannelGainm+
WantedPathLossm, wherein, PmPerformance number for characterizing path m, S is used for the transmission power for characterizing signal source,
TotalChannelGainmPad value for characterizing path m, WantedPathLossmFor characterizing being imitated by channel for path m
True instrument to darkroom pad value.
Alternatively, the center work(of MIMO OTA test systems is obtained according to the performance number per paths by equation below
Rate：Wherein, PtotalCenter power for characterizing MIMO OTA test systems, M is used for table
Levy the number of paths of test system.
Alternatively, the expectation input power and crest factor of channel simulator instrument are set, so that channel simulator instrument receives signal
The input signal that source is sent.
Another aspect according to embodiments of the present invention, is additionally provided a kind of for obtaining MIMO OTA test systems center work(
The device of rate, including：First acquisition module, the transmission power for obtaining input signal, wherein, input signal is by MIMO OTA
The signal source of test system is sent；Second acquisition module, darkroom is reached on mulitpath Zhong Meitiao roads for obtaining input signal
The signal attenuation in footpath, wherein, darkroom is used to place equipment under test when MIMO OTA test systems test equipment under test；
Determining module, the signal attenuation according to the transmission power of signal source and per paths determines the center work(of MIMO OTA test systems
Rate.
Alternatively, the second acquisition module includes：First acquisition submodule, the input cable correspondence for obtaining every paths
Loss, wherein, input cable is signal source to the cable between channel simulator instrument；Second acquisition submodule, for obtaining letter
Attenuated inside of the road emulating instrument in every paths；3rd acquisition submodule, declines for obtaining channel simulator instrument to the space in darkroom
Subtract.
Optionally it is determined that module includes：3rd acquisition submodule, for the transmission power according to signal source and per paths
Signal attenuation, obtain per paths performance number；4th acquisition submodule, for according to the performance number per paths, obtaining
The center power in darkroom.
Another aspect according to embodiments of the present invention, additionally provides a kind of storage medium, and storage medium includes the journey of storage
Sequence, wherein, equipment where controlling storage medium when program is run performs being surveyed for obtaining MIMO OTA for above-mentioned any one
The method of test system center power.
Another aspect according to embodiments of the present invention, additionally provides a kind of processor, and processor is used for operation program, its
In, program performs the method for obtaining MIMO OTA test system center powers of above-mentioned any one when running.
In embodiments of the present invention, the transmission power of input signal is obtained, input signal is obtained and reaches darkroom on a plurality of road
The signal attenuation in footpath, is determined in MIMO OTA test systems according to the signal attenuation of the transmission power of signal source and mulitpath
Heart power.The method that such scheme calculates center power is the path loss according to MIMO OTA test systems, then is decomposed every
Bar link carries out evaluation respectively and, finally by composite calulation, obtains the actual power value at darkroom center.Pass through such scheme letter
Change the requirement to channel simulator parameter setting, improve the redundancy of system.Exported by avoiding using channel simulator
The measurement function of power, solve in correlation technique due to reading data dependence channel simulator instrument parameter configuration, cause survey
The inaccurate technical problem of result is measured, while reducing the uncertainty of system.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of structural representation of MIMO OTA test systems according to correlation technique；
Fig. 2 is a kind of stream for being used to obtain the method for MIMO OTA test system center powers according to embodiments of the present invention
Cheng Tu；
Fig. 3 is a kind of schematic diagram of determination MIMO OTA test system center powers according to embodiments of the present invention；
Fig. 4 is a kind of showing for device for being used to obtain MIMO OTA test system center powers according to embodiments of the present invention
It is intended to.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Embodiment 1
There is provided a kind of reality for being used to obtain the method for MIMO OTA test system center powers according to embodiments of the present invention
Apply example, it is necessary to explanation, the step of the flow of accompanying drawing is illustrated can such as one group computer executable instructions meter
Performed in calculation machine system, and, although logical order is shown in flow charts, but in some cases, can be with difference
Shown or described step is performed in order herein.
Fig. 2 is the flow for being used to obtain the method for MIMO OTA test system center powers according to embodiments of the present invention
Figure, as shown in Fig. 2 this method comprises the following steps：
Step S202, obtain input signal transmission power, wherein, input signal by MIMO OTA test systems signal
Source is sent.
Specifically, above-mentioned signal source can be communication simulation device, i.e. integrated wireless communication tester.
Tester.During MIMO OTA test systems are tested measured object, signal source sends input signal,
And connection is set up by the measured object in the probe and darkroom in darkroom, so that measured object receives input signal.
Step S204, obtains input signal and reaches signal attenuation of the darkroom per paths in mulitpath, wherein, darkroom
For placing equipment under test when MIMO OTA test systems are tested equipment under test.
Specifically, above-mentioned mulitpath is different according to the configuration of channel model file, the quantity in path is different, usual eight
Dual polarization probe has 16 paths, might have under different system configuration more.
In a kind of optional embodiment, in above-mentioned mulitpath, the signal attenuation per paths can include as follows
Several parts：Input cable waste, channel simulator loss, and space loss.Obtain input signal and reach darkroom a plurality of
The signal attenuation in path can be that every paths are obtained with above-mentioned three kinds of losses.
Step S206, the signal attenuation according to the transmission power of signal source and per paths determines MIMO OTA test systems
Center power.
Herein it should be noted that correlation technique obtain MIMO OTA test systems center power when, it is necessary to pass through
The loss value at the Average input level parameter combination darkrooms center of channel simulator instrument input port determines, finally according to
The power of the output port of channel simulator can be read by test software.It can thus be appreciated that the determination of its center power is dependent on setting
Average input level parameters and the result that reads of test software, and the such scheme of the application passes through MIMO
The transmission power of the path loss combined input signal of OTA test systems determines the center power of MIMO OTA test systems,
So that Average of the determination of the center power of MIMO OTA test systems independent of channel simulator instrument input port
The test result of input level parameters and test software.
From the foregoing, it will be observed that the above embodiments of the present application obtains the transmission power of input signal, obtain input signal and reach darkroom
In the signal attenuation of mulitpath, determine that MIMO OTA are tested according to the signal attenuation of the transmission power of signal source and mulitpath
The center power of system.The method that such scheme calculates center power is the path loss according to MIMO OTA test systems, then
Decompose each of the links and carry out difference evaluation finally by composite calulation, obtain the actual power value at darkroom center.By upper
The scheme of stating simplifies the requirement to channel simulator parameter setting, improves the redundancy of system.Imitated by avoiding using channel
The measurement function of true device power output, the parameter for solving the data dependence channel simulator instrument in correlation technique due to reading is matched somebody with somebody
Put, cause the technical problem that measurement result is inaccurate, while reducing the uncertainty of system.
Optionally, according to the above embodiments of the present application, step S204 obtains input signal and reaches darkroom in mulitpath
Signal attenuation per paths, including：
Step S2041, obtains the corresponding loss of input cable per paths, wherein, input cable is that signal source is extremely believed
Cable between road emulating instrument.
Specifically, the corresponding loss of above-mentioned input cable can be obtained according to Network Analyzer.Fig. 3 is according to of the invention real
Apply a kind of schematic diagram of determination MIMO OTA test system center powers of example.In a kind of optional embodiment, with reference to Fig. 3 institutes
Show, integrated wireless communication tester (signal source) exports input signal S to the line between channel model unit (channel simulator instrument)
Cable is input cable, and the corresponding loss of the part cable is the corresponding loss of input cable that above-mentioned steps are obtained, i.e. Input
Loss。
Step S2043, obtains attenuated inside of the channel simulator instrument in each path.
Still combine shown in figure, channel model unit (channel simulator instrument) declining in each path is read in above-mentioned steps
Depreciation, i.e. Total Channel Gain.
Before signal attenuation of the input signal arrival darkroom in mulitpath per paths is obtained, in addition it is also necessary to which letter is set
The expectation input power and crest factor of road emulating instrument, so that channel simulator instrument receives the input signal that the signal source is sent.
Step S2045, obtains channel simulator instrument to the space attenuation in darkroom.
In above-mentioned steps, the space attenuation of MIMO OTA test systems can be obtained by calibrating, i.e., is imitated by signal
True instrument to darkroom Wanted Path Loss.
In above-mentioned steps, with reference to shown in Fig. 3, mainly included by integrated wireless communication tester to the loss between darkroom
Input Loss, Total Channel Gain and Wanted Path Loss per paths, therefore combine above three
Parameter, you can it is determined that the signal attenuation per paths.
Optionally, according to the above embodiments of the present application, step S206, according to the transmission power of signal source and per paths
Signal attenuation determines the center power of MIMO OTA test systems, including：
Step S2061, the signal attenuation according to the transmission power of signal source and per paths obtains the power per paths
Value.
Step S2063, according to the performance number of every paths, obtains the center power of MIMO OTA test systems.
Optionally, according to the above embodiments of the present application, the signal attenuation according to the transmission power of signal source and per paths,
The performance number per paths is obtained, including：
Performance number per paths is obtained by equation below：
Pm=S+TotalChannelGainm+WantedPathLossm,
Wherein, PmPerformance number for characterizing path m, S is used for the transmission power for characterizing signal source,
TotalChannelGainmPad value for characterizing path m, WantedPathLossmFor characterizing being imitated by channel for path m
True instrument to darkroom pad value.
Optionally, according to the above embodiments of the present application, according to the performance number of every paths, MIMO OTA test systems are obtained
Center power, including：
By equation below according to the performance number per paths, the center power of MIMO OTA test systems is obtained:
Wherein, PtotalCenter power for characterizing MIMO OTA test systems, M is used for the number of path of characterization test system
Amount.
Below, the example with reference to shown in Fig. 3, the center power for the determination MIMO OTA test systems that above-mentioned steps are realized
Method carry out a kind of optional embodiment.
1st, the transmission power level S for the communication simulation device (integrated wireless communication tester) that user is set is obtained.
2nd, according to input cable waste, loss value will be obtained according to by network analysis instrument, and set to channel simulator
The input cable waste Input Loss of instrument (channel model unit).
The 3rd, Average Input Level and the Crest Factor (crest factor) of channel simulator are set, to ensure
Channel simulator can have correctly received communication simulation device transmission signal.
4th, the pad value Total Channel Gain in each path of channel model are read.
5th, with reference to Wanted Path Loss, the performance number at darkroom center is directly calculated.
Specific formula for calculation is as follows, wherein, the unit of power P is dBm or dBm/15kHz：
If total path bar number is M in system；
The performance number P of m pathsm=S+TotalChannelGainm+WantedPathLossm；
The total power value at darkroom center
From the foregoing, it will be observed that the such scheme in the application has evaded traditional reading channel simulator output end power to calculate
The shortcoming of the method for darkroom center performance number, only requires that tester sets a rational Average Input Level
(expectation input power), it is not necessary to matched completely with input power numerical value completely.After calibration data is obtained, set by reading
Integrated wireless communication tester input signal S watt level, damaged according to the input obtained using radiofrequency signal processing unit
Input loss and Wanted Path Loss are consumed, then read the attenuated inside Total of the channel model unit set
Channel Gain, directly carry out the power summation in all paths, so as to calculate the performance number of darkroom center.Above-mentioned side
The advantage of case is that the attenuated inside Total Channel Gain of channel model unit are once provided with channel model unit
Parameter would not change again, even expect input power Average Input Level differ with actually entering power
In the case of cause, the performance number at darkroom center still can be correctly set, due to no longer reading the desired output of channel simulator instrument
Power, so that the problem of having evaded the continuous saltus step of TDD signal powers.
Embodiment 2
There is provided a kind of reality for being used to obtain the device of MIMO OTA test system center powers according to embodiments of the present invention
Example is applied, Fig. 4 is a kind of signal for being used to obtain the device of MIMO OTA test system center powers according to embodiments of the present invention
Figure, as shown in figure 4, the device includes：
First acquisition module 40, the transmission power for obtaining input signal, wherein, input signal is tested by MIMO OTA
The signal source of system is sent.
Second acquisition module 42, declines for obtaining signal of the input signal arrival darkroom per paths in mulitpath
Subtract, wherein, darkroom is used to place equipment under test when MIMO OTA test systems test equipment under test.
Determining module 44, the signal attenuation according to the transmission power of signal source and per paths determines MIMO OTA tests system
The center power of system.
Optionally, according to the above embodiments of the present application, the second acquisition module includes：
First acquisition submodule, the corresponding loss of input cable for obtaining every paths, wherein, input cable is letter
Number source is to the cable between channel simulator instrument；
Second acquisition submodule, for obtaining attenuated inside of the channel simulator instrument in every paths；
3rd acquisition submodule, for obtaining channel simulator instrument to the space attenuation in darkroom.
Optionally, according to the above embodiments of the present application, determining module includes：
3rd acquisition submodule, the signal attenuation for the transmission power according to signal source and per paths obtains every
The performance number in path；
4th acquisition submodule, for according to the performance number per paths, obtaining the center power in darkroom.
Optionally, according to the above embodiments of the present application, the 3rd acquisition submodule includes：
First computing unit, for obtaining the performance number per paths by equation below：Pm=S+
TotalChannelGainm+WantedPathLossm, wherein, PmPerformance number for characterizing path m, S is used to characterize signal source
Transmission power, TotalChannelGainmPad value for characterizing path m, WantedPathLossmFor characterizing path m
The pad value by channel simulator instrument to darkroom.
Optionally, according to the above embodiments of the present application, the 4th acquisition submodule includes：
Second computing unit, for, according to the performance number per paths, obtaining MIMO OTA tests system by equation below
The center power of system；Wherein, PtotalCenter work(for characterizing MIMO OTA test systems
Rate, M is used for the number of paths of characterization test system.
Optionally, according to the above embodiments of the present application, said apparatus also includes：
Setup module, desired output power and crest factor for setting channel simulator instrument, so that channel simulator instrument connects
Receive the input signal that signal source is sent.
Embodiment 3
According to embodiments of the present invention there is provided a kind of storage medium, storage medium includes the program of storage, wherein, in journey
Equipment where controlling storage medium during sort run, which performs any one in embodiment 1, to be used to obtain MIMO OTA test systems center
The method of power.
Embodiment 4
According to embodiments of the present invention there is provided a kind of processor, processor is used for operation program, wherein, when program is run
Perform the method that any one in embodiment 1 is used to obtain MIMO OTA test system center powers.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, others can be passed through
Mode is realized.Wherein, device embodiment described above is only schematical, such as division of described unit, Ke Yiwei
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, it can be stored in a computer read/write memory medium.Understood based on such, technical scheme is substantially
The part contributed in other words to correlation technique or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are to cause a computer
Equipment (can for personal computer, server or network equipment etc.) perform each embodiment methods described of the invention whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of method for obtaining MIMO OTA test system center powers, it is characterised in that including：
The transmission power of input signal is obtained, wherein, the input signal is sent out by the signal source of the MIMO OTA test systems
Go out；
Obtain the input signal and reach signal attenuation of the darkroom per paths in mulitpath, wherein, the darkroom is used for
The equipment under test is placed when the MIMO OTA test systems are tested equipment under test；
The MIMO OTA test systems are determined according to the transmission power of the signal source and the signal attenuation per paths
Center power.
2. according to the method described in claim 1, it is characterised in that obtain the input signal and reach darkroom in mulitpath
Signal attenuation per paths, including：
The corresponding loss of input cable per paths is obtained, wherein, the input cable is the signal source to channel
Cable between emulating instrument；
The channel simulator instrument is obtained in the attenuated inside per paths；
The channel simulator instrument is obtained to the space attenuation in the darkroom.
3. method according to claim 1 or 2, it is characterised in that according to the transmission power of the signal source and described every
The signal attenuation of paths determines the center power of the MIMO OTA test systems, including：
According to the transmission power of the signal source and the signal attenuation per paths, the power per paths is obtained
Value；
According to the performance number per paths, the center power of the MIMO OTA test systems is obtained.
4. method according to claim 3, it is characterised in that according to the transmission power of the signal source and every road
The signal attenuation in footpath, obtains the performance number per paths, including：
The performance number per paths is obtained by equation below：
Pm=S+TotalChannelGainm+WantedPathLossm,
Wherein, PmPerformance number for characterizing path m, S is used for the transmission power for characterizing the signal source,
TotalChannelGainmPad value for characterizing path m, WantedPathLossmFor characterizing being imitated by channel for path m
True instrument to the darkroom pad value.
5. method according to claim 4, it is characterised in that according to the performance number per paths, obtains described
The center power of MIMO OTA test systems, including：
By equation below according to the performance number per paths, the center power of the MIMO OTA test systems is obtained：
<mrow>
<msub>
<mi>P</mi>
<mrow>
<mi>t</mi>
<mi>o</mi>
<mi>t</mi>
<mi>a</mi>
<mi>l</mi>
</mrow>
</msub>
<mo>=</mo>
<mn>10</mn>
<mo>*</mo>
<msub>
<mi>log</mi>
<mn>10</mn>
</msub>
<mrow>
<mo>(</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>m</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>M</mi>
</munderover>
<msup>
<mn>10</mn>
<mfrac>
<mrow>
<mi>P</mi>
<mi>m</mi>
</mrow>
<mn>10</mn>
</mfrac>
</msup>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
Wherein, PtotalCenter power for characterizing the MIMO OTA test systems, M is used for the number of path of characterization test system
Amount.
6. according to the method described in claim 1, it is characterised in that reach darkroom in mulitpath obtaining the input signal
In per paths signal attenuation before, methods described also includes：
The expectation input power and crest factor of channel simulator instrument are set, so that the channel simulator instrument receives the signal source hair
The input signal gone out.
7. a kind of device for being used to obtain MIMO OTA test system center powers, it is characterised in that including：
First acquisition module, the transmission power for obtaining input signal, wherein, the input signal is surveyed by the MIMO OTA
The signal source of test system is sent；
Second acquisition module, signal attenuation of the darkroom per paths in mulitpath is reached for obtaining the input signal,
Wherein, the darkroom is used to place the equipment under test when the MIMO OTA test systems test equipment under test；
Determining module, the MIMO OTA are determined according to the transmission power of the signal source and the signal attenuation per paths
The center power of test system.
8. device according to claim 7, it is characterised in that second acquisition module includes：
First acquisition submodule, for obtaining the corresponding loss of input cable per paths, wherein, the input cable
For the signal source to the cable between channel simulator instrument；
Second acquisition submodule, for obtaining the channel simulator instrument in the attenuated inside per paths；
3rd acquisition submodule, for obtaining the channel simulator instrument to the space attenuation in the darkroom.
9. the device according to claim 7 or 8, it is characterised in that the determining module includes：
3rd acquisition submodule, the signal attenuation for the transmission power according to the signal source and per paths obtains described
Performance number per paths；
4th acquisition submodule, for according to the performance number per paths, obtaining the center power in the darkroom.
10. a kind of storage medium, it is characterised in that the storage medium includes the program of storage, wherein, in described program operation
When control the storage medium where in equipment perform claim requirement 1 to 6 being used for described in any one obtain MIMO OTA surveys
The method of test system center power.
11. a kind of processor, it is characterised in that the processor is used for operation program, wherein, right of execution when described program is run
Profit requires the method for obtaining MIMO OTA test system center powers described in any one in 1 to 6.
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