CN106100760A - A kind of probe calibration scheme for MIMO test system - Google Patents
A kind of probe calibration scheme for MIMO test system Download PDFInfo
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- CN106100760A CN106100760A CN201610580021.4A CN201610580021A CN106100760A CN 106100760 A CN106100760 A CN 106100760A CN 201610580021 A CN201610580021 A CN 201610580021A CN 106100760 A CN106100760 A CN 106100760A
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- 239000000523 sample Substances 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000010606 normalization Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 abstract description 7
- 238000007405 data analysis Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of probe calibration scheme for MIMO test system, what the present invention proposed is the calibration steps Frings transmission formula from antenna, utilize two antenna methods to determine the signal loss in the system of anechoic chamber, part, and probe antenna is normalized compensation.This patent selects a gain popped one's head in as reference standard in Multi probe antenna measurement system, Network Analyzer is used to carry out receiving and transmitting signal, by the Data Analysis Services that Network Analyzer is read, the numerical value that probe compensation is different is normalized, have that system channel capacity is big, the high communication quality, test result feature accurately.
Description
Technical field
The present invention relates to wireless communication technology field, a kind of probe for MIMO test system
Calibration program.
Background technology
MIMO (Multiple-Input Multiple-Output) technology refers to use many respectively at transmitting terminal and receiving terminal
Individual transmitting antenna and reception antenna, make signal pass through transmitting terminal and multiple antenna transmission of receiving terminal and reception, thus improve logical
Letter quality.It can make full use of space resources, realizes MIMO by multiple antennas, is not increasing frequency spectrum resource and antenna is sent out
In the case of penetrating power, system channel capacity can be increased exponentially, demonstrate obvious advantage, be considered of future generation mobile logical
The core technology of letter.
MIMO test system comprises multiple dual polarization (H, V two polarization) probe, each probe transmitting-receiving ability to signal
Inconsistent, between dual polarization probe mutual coupling, signal comes out to be received the damage during this by mobile phone from probe antenna
Consumption, these factors all can have a strong impact on the accuracy of test result.But be strict with in MIMO tests, in the multichannel of MIMO
The gain that each probe in passage is launched in systems keeps consistent, in the urgent need to a kind of school for MIMO test system
Quasi-method.
Therefore, how to provide a kind of have that system channel capacity is big, the high communication quality, the accurate feature of test result for
The probe calibration scheme of MIMO test system is the problem that those skilled in the art need solution badly.
Summary of the invention
In view of this, the invention provides one and have that system channel capacity is big, the high communication quality, test result the most special
The probe calibration scheme for MIMO test system of point.
For achieving the above object, the present invention provides following technical scheme:
A kind of for MIMO test system probe calibration scheme, it is characterised in that including: the calibration steps of proposition be from
The Frings transmission formula of antenna sets out, and determines the signal loss in the system of anechoic chamber, part by two antenna methods, and
Probe antenna is normalized compensation；The method that this patent provides, can all carry out amplitude to each road of MIMO test system
Normalization calibration, and the loss balancing of every path；Probe antenna gain G inside mimo system can be obtainedt；
Probe normalization calibration and compensation principle be:
The antenna that two polarised directions are consistent, meets relationship below:
Pr=(c/4 π Rf)2PtGtGr (1)
Above formula both sides are taken denary logarithm simultaneously, obtain result shown in formula 2:
G1(dB)=201g (4 π Rf/c)+101g (Pr/Pt)-Gr(dB) (2)
Wherein, c is electromagnetic wave spread speed in a vacuum, and f is the operating frequency of signal, the standard horn of system calibration
The reception power of antenna is Pr, the transmitting power of system probe antenna is Pt, R be the spacing of two antennas, GrFor standard horn sky
The gain of line, GtFor system probe antenna gain.
Preferably, above-mentioned a kind of in the probe calibration scheme of MIMO test system, the loss of described every path
Offset determines that method is as follows:
Known system probe used is G in the real gain of certain frequency freal, the gain recorded in systems is Gt, that
The difference of both is the offset of system；The system balance in each footpath of MIMO OTA system can be using the following method
Obtain:
Offset=Greal-Gt (3)。
Preferably, above-mentioned a kind of in the probe calibration scheme of MIMO test system, described each road all carries out width
The normalization calibration steps of degree is as follows:
We pop one's head in as reference probe to calibrate first recorded, and first gain recorded in system of popping one's head in is Gt1,
It is G that second probe records gain in systemt2, with real gain G of first proberealFor reference standard, to second spy
Head is normalized；The like, finally make each probe gain in systems consistent:
offset1=Greal-Gt1 (4)
offset2=Greal-Gt2 (5)
..........。
Understanding via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of test for MIMO is
The probe calibration scheme of system, what the present invention proposed is the calibration steps Frings transmission formula from antenna, utilizes two antennas
Method determines the signal loss in the system of anechoic chamber, part, and probe antenna is normalized compensation.This patent is many
Probe antenna measurement system selects the gain of a probe as reference standard, use Network Analyzer to carry out receiving and transmitting signal, logical
Cross the Data Analysis Services that Network Analyzer is read, the numerical value that probe compensation is different is normalized；Have and be
System channel capacity is big, the high communication quality, test result feature accurately.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
The accompanying drawing provided obtains other accompanying drawing.
Fig. 1 accompanying drawing is the structural representation that the present invention calibrates when H polarizes.
Fig. 2 accompanying drawing is the structural representation that the present invention calibrates when V polarizes.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the invention discloses one and have that system channel capacity is big, the high communication quality, the accurate feature of test result
For MIMO test system probe calibration scheme.
Refer to accompanying drawing 1, accompanying drawing 2, for a kind of probe calibration scheme for MIMO test system disclosed by the invention, tool
Body includes:
The calibration steps proposed is the Frings transmission formula from antenna, determines that signal is at electricity by two antenna methods
The loss of the system of ripple darkroom part, and probe antenna is normalized compensation；The method that this patent provides, can survey MIMO
Each road of test system all carries out the normalization calibration of amplitude, and the loss balancing of every path；Probe antenna can be obtained
Gain G t inside mimo system；
Probe normalization calibration and compensation principle be:
The antenna that two polarised directions are consistent, meets relationship below:
Pr=(c/4 π Rf)2PtGtGr (1)
Above formula both sides are taken denary logarithm simultaneously, obtain result shown in formula 2:
Gt(dB)=201g (4 π Rf/c)+101g (Pr/Pt)-Gr(dB) (2)
Wherein, c is electromagnetic wave spread speed in a vacuum, and f is the operating frequency of signal, the standard horn of system calibration
The reception power of antenna is Pr, the transmitting power of system probe antenna be Pt, R be the spacing of two antennas, Gr is standard horn
The gain of antenna, Gt is system probe antenna gain.
The invention discloses a kind of probe calibration scheme for MIMO test system, what the present invention proposed is calibration steps
From the Frings transmission formula of antenna, utilize two antenna methods to determine the signal loss in the system of anechoic chamber, part,
And probe antenna is normalized compensation.This patent selects a gain conduct popped one's head in Multi probe antenna measurement system
Reference standard, uses Network Analyzer to carry out receiving and transmitting signal, by the Data Analysis Services reading Network Analyzer, mends probe
Repay different numerical value to be normalized；Have that system channel capacity is big, the high communication quality, test result the most special
Point.
In order to optimize technique scheme further, the loss balancing value of every path determines that method is as follows:
Known system probe used is G in the real gain of certain frequency freal, the gain recorded in systems is Gt, that
The difference of both is the offset of system；The system balance in each footpath of MIMO OTA system can be using the following method
Obtain:
Offet=Greal-Gt (3)。
In order to optimize technique scheme further, the normalization calibration steps that each road all carries out amplitude is as follows:
We pop one's head in as reference probe to calibrate first recorded, and first gain recorded in system of popping one's head in is Gt1,
It is G that second probe records gain in systemt2, with real gain G of first proberealFor reference standard, to second spy
Head is normalized；The like, finally make each probe gain in systems consistent:
offset1=Greal-Gt1 (4)
offset2=Greal-Gt2 (5)
..........。
In order to optimize technique scheme further, patent of the present invention realizes based on techniques below method:
The first step, selects the E5071 of Agilent as calibration signal transmitting and receiving instrument, and the standard horn of calibration is double roof-angle cone loudspeakers
SH-600, working frequency range is 0.6-6GHz, contains the working frequency range of present stage mobile communication system；
Second step, is connected to the probe of the MIMO anechoic chamber, of test by the emission port (Tx port) of Network Analyzer
Antenna, receiving port is placed on the standard horn on anechoic chamber, pole；
3rd step, by the H polarized probe of electromagnetic horn horizontal positioned alignment test system, it is ensured that launch the reception sky of antenna
The polarization of line is consistent, and the signal that Network Analyzer sends sends through electromagnetic horn, system probe antenna return after receiving
Network Analyzer, is read corresponding S21 data by our software；
Repeat step 3, the S21 data of each H polarized probe of test system are read out, accompanying drawing: loudspeaker turn
90 ° of horizontal positioned；
4th step, after being tested by all of for system H polarized probe, then calibrates V polarized probe.By loudspeaker sky
The V polarized probe of line half-twist alignment test system, reads data method and the 3rd step is consistent；
The data read are processed by the 5th step, obtain the data that each probe place path needs to compensate.With system
As a example by one H polarized probe calibration: assuming that the electromagnetic horn of calibration and probe antenna spacing are 50mm, need the work frequency of calibration
Point is 2.5G, and the S12 data that net point reads are-35dB, and the calibration electromagnetic horn gain when f=2.5Ghz is 8dB, system
Probe antenna gain when f=2.5Ghz is 5dB；
Gt=201g (4 × π × 0.05 × 25/3)-45-8=-45.81dB
Offset=Greal-Gt=5-(-45.81)=50.81dB
In summary, this MIMO needs the numerical value to this H probe path compensation to be 50.81dB when testing system calibration.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.For device disclosed in embodiment
For, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part sees method part and says
Bright.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (3)
1. the probe calibration scheme for MIMO test system, it is characterised in that including: the calibration steps of proposition is from sky
The Frings transmission formula of line sets out, and determines the signal loss in the system of anechoic chamber, part by two antenna methods, and right
Probe antenna is normalized compensation；The method that this patent provides, can all carry out amplitude to each road of MIMO test system
Normalization is calibrated, and the loss balancing of every path；Probe antenna gain G inside mimo system can be obtainedt；
Probe normalization calibration and compensation principle be:
The antenna that two polarised directions are consistent, meets relationship below:
Pr=(c/4 π Rf)2PtGtGr (1)
Above formula both sides are taken denary logarithm simultaneously, obtain result shown in formula 2:
Gt(dB)=201g (4 π Rf/c)+101g (Pr/Pt)-Gr(dB) (2)
Wherein, c is electromagnetic wave spread speed in a vacuum, and f is the operating frequency of signal, the standard horn antenna of system calibration
Reception power be Pr, the transmitting power of system probe antenna is Pt, R be the spacing of two antennas, GrFor standard horn antenna
Gain, GtFor system probe antenna gain.
The most according to claim 1 a kind of for MIMO test system probe calibration scheme, it is characterised in that described often
The loss balancing value of bar path determines that method is as follows:
Known system probe used is G in the real gain of certain frequency freal, the gain recorded in systems is Gt, then this
Both differences are the offset of system；The system balance in each footpath of MIMO OTA system can obtain using the following method
Arrive:
Offset=Greal-Gt (3)。
The most according to claim 1 a kind of for MIMO test system probe calibration scheme, it is characterised in that described often
The normalization calibration steps that one tunnel all carries out amplitude is as follows:
We pop one's head in as reference probe to calibrate first recorded, and first gain recorded in system of popping one's head in is Gt1, second
It is G that individual probe records gain in systemt2, with real gain G of first proberealFor reference standard, second is popped one's head in into
Row normalized；The like, finally make each probe gain in systems consistent:
offset1=Greal-Gt1 (4)
offset2=Greal-Gt2 (5)
..........。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610580021.4A CN106100760A (en) | 2016-07-22 | 2016-07-22 | A kind of probe calibration scheme for MIMO test system |
| PCT/CN2016/111863 WO2018014505A1 (en) | 2016-07-22 | 2016-12-24 | Probe calibration scheme for mimo testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610580021.4A CN106100760A (en) | 2016-07-22 | 2016-07-22 | A kind of probe calibration scheme for MIMO test system |
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| WO (1) | WO2018014505A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018014505A1 (en) * | 2016-07-22 | 2018-01-25 | 深圳市新益技术有限公司 | Probe calibration scheme for mimo testing system |
| CN108508393A (en) * | 2018-07-03 | 2018-09-07 | 上海益麦电磁技术有限公司 | A kind of Multi probe Antenna testing system probe calibration system and calibration method |
| CN109725275A (en) * | 2018-12-26 | 2019-05-07 | 刘科宏 | Probe calibration method based near field Multi probe antenna measurement system |
| CN110166144A (en) * | 2019-05-09 | 2019-08-23 | 武汉虹信通信技术有限责任公司 | A kind of test macro for testing mimo antenna |
| CN110518990A (en) * | 2019-08-19 | 2019-11-29 | 深圳创维数字技术有限公司 | Calibration method, system and the computer readable storage medium of multiple antennas WiFi product |
| US11187737B2 (en) | 2019-06-06 | 2021-11-30 | Rohde & Schwarz Gmbh & Co. Kg | System and method for calibrating radio frequency test chambers |
| CN116381467A (en) * | 2023-06-05 | 2023-07-04 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Asymmetric compensation method, device, equipment and storage medium for dual-port near-field probe |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115236415B (en) * | 2022-06-02 | 2024-02-09 | 中国计量科学研究院 | Antenna gain acquisition method and device, electronic equipment and storage medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018014505A1 (en) * | 2016-07-22 | 2018-01-25 | 深圳市新益技术有限公司 | Probe calibration scheme for mimo testing system |
| CN108508393A (en) * | 2018-07-03 | 2018-09-07 | 上海益麦电磁技术有限公司 | A kind of Multi probe Antenna testing system probe calibration system and calibration method |
| CN109725275A (en) * | 2018-12-26 | 2019-05-07 | 刘科宏 | Probe calibration method based near field Multi probe antenna measurement system |
| CN109725275B (en) * | 2018-12-26 | 2022-08-30 | 刘科宏 | Probe calibration method based on near-field multi-probe antenna measurement system |
| CN110166144A (en) * | 2019-05-09 | 2019-08-23 | 武汉虹信通信技术有限责任公司 | A kind of test macro for testing mimo antenna |
| US11187737B2 (en) | 2019-06-06 | 2021-11-30 | Rohde & Schwarz Gmbh & Co. Kg | System and method for calibrating radio frequency test chambers |
| CN110518990A (en) * | 2019-08-19 | 2019-11-29 | 深圳创维数字技术有限公司 | Calibration method, system and the computer readable storage medium of multiple antennas WiFi product |
| CN110518990B (en) * | 2019-08-19 | 2021-10-22 | 深圳创维数字技术有限公司 | Calibration method, system and computer readable storage medium for multi-antenna WiFi product |
| CN116381467A (en) * | 2023-06-05 | 2023-07-04 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Asymmetric compensation method, device, equipment and storage medium for dual-port near-field probe |
| CN116381467B (en) * | 2023-06-05 | 2023-09-01 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Asymmetric compensation method, device, equipment and storage medium for dual-port near-field probe |
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| WO2018014505A1 (en) | 2018-01-25 |
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Application publication date: 20161109 |