CN1905494A - System for testing space radio frequency performance of WLAN apparatus - Google Patents
System for testing space radio frequency performance of WLAN apparatus Download PDFInfo
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- CN1905494A CN1905494A CN 200610089147 CN200610089147A CN1905494A CN 1905494 A CN1905494 A CN 1905494A CN 200610089147 CN200610089147 CN 200610089147 CN 200610089147 A CN200610089147 A CN 200610089147A CN 1905494 A CN1905494 A CN 1905494A
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Abstract
The invention relates to an aerial radio frequency performance testing system for wireless local-area network (WLAN) equipment, belonging to the radio frequency testing technical field of wireless communication products. And it comprises: WLAN protocol tester, spectrum analyzer, cellular base station simulator, system control platform and connecting cables, where the system control platform is connected through cable and TCP/IP protocol with the WLAN protocol tester to control the WLAN protocol tester to make related tests; the system control platform is connected through GPIB cable with the cellular base station simulator and the spectrum analyzer. And it accords with national standard--Wi-Fi Mobile Converged Devices RF Certification Test Document and can complete all contained test items specified in the standard for making OTA test on WLAN equipment, having high testing accuracy, high automation degree and low indeterminacy, and simple and convenient to operate.
Description
Technical field
The invention belongs to the radio frequency testing technical field of wireless communications products, especially the design of WLAN devices test macro.
Background technology
Along with development of modern industry, electromagnetic environment goes from bad to worse, all kinds of Wireless Telecom Equipments only possess good radiated radio frequency (RF) characteristic and receiving feature just can insure telecommunication service quality, be that total radiant power (TRP) wants big, it is high that total receiving sensitivity (TIS) is wanted, and promptly the air interface OTA of product (aerial radio frequency testing) performance is good.Especially exempt to authorize in the frequency range at 2.4/5GHz, the extensive use of all kinds of wireless products, make that the electromagnetic environment of this frequency range is abominable unusually, only possess good OTA performance at the Wireless Telecom Equipment of this frequency range and could guarantee its operate as normal, and WLAN devices exempts to authorize exemplary wireless communication device in the frequency range for this, most in the world manufacturers, some international well-known laboratories (comprising communication measurement centre of China's Ministry of Information Industry), U.S. CTIA, Wi-Fi Alliance etc. all playing an active part in its OTA testing standard of formulation, have now been finished the formulation of testing standard.The method of testing of comparative maturity is the detection of relevant cellular mobile telephone in the world at present, because cellular device is the alien frequencies duplex apparatus, so its transmitting power can be got final product by the power of a receiver test fixed frequency point, and, then can fully uplink downlink separately only be carried out the test of down link for the receiving sensitivity test.But this method is then unworkable for WLAN devices, because WLAN devices is a common-frequency time division equipment, the shared same frequency of its uplink downlink, so up-downgoing can not be separated fully, test for radiant power, if with the power summation under this frequency of receiver test, then can not reflect this EUT (equipment under test) actual power size, this reason also is applicable to the receiving sensitivity test equally.At present, International Standards Organization's Wi-Fi Alliance and CTIA standard group have been issued " Wi-Fi Mobile Converged Devices RFCertification Test Document " jointly, in this testing standard OTA test how to carry out WLAN devices is stipulated, but at present, because technology, the restriction in equipment and place is difficult to realize the test of above prescribed by standard.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, a kind of aerial radio-frequency performance test macro of WLAN devices is proposed, this test macro is abideed by international standard " Wi-Fi Mobile ConvergedDevices RF Certification Test Document ", that can finish defined in this standard carries out all test items that the OTA test is comprised to WLAN devices, and measuring accuracy height, easy and simple to handle, the automaticity height, uncertainty is low.。
The present invention proposes the aerial radio-frequency performance test macro of a WLAN devices, it is characterized in that this system comprises: the protocol of wireless local area network tester, spectrum analyzer, the cellular basestation simulator, system control position, and the interconnective cable of described parts; The annexation of each parts is: described system control position links to each other with the protocol of wireless local area network tester with ICP/IP protocol by cable (netting twine), and control protocol of wireless local area network tester carries out dependence test; This system control position also by cable (GPIB cable) respectively with described cellular basestation simulator, spectrum analyzer links to each other.
Technical characterstic of the present invention and effect
System of the present invention is placed in the OTA darkroom, this system can finish all tests of being contained in the international standard " Wi-FiMobile Converged Devices RF Certification Test Document ", and measuring accuracy height, easy and simple to handle, the automaticity height, uncertainty is low.This system can finish all tests of defined in the above standard.
Native system adopts the protocol of wireless local area network analyzer as nucleus equipment, is aided with spectrum analyzer, and base station simulator, system controlling software have been formed the complete radio frequency test system of a cover.
Adopt the protocol of wireless local area network analyzer as the tester of analyzing the receiving sensitivity Packet Error Ratio in the native system, because its protocal analysis is powerful, reduce the uncertainty of the Packet Error Ratio test in WLAN devices receptivity test process, improved the precision of system.
The present invention also can adopt accurate radio frequency attenuator to carry out the test of receiving sensitivity, has improved the stable and repeated of test greatly, and the test uncertainty of whole system is reduced greatly.
The present invention also can further comprise the radio-frequency (RF) switch instrument, without the connection of conversion cable, has simplified the circuit connection when carrying out different experiments.
Description of drawings
Fig. 1 forms structured flowchart for the aerial radio-frequency performance test macro embodiment of WLAN devices of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.
The present invention proposes a kind of aerial radio-frequency performance test macro of WLAN devices, can detect eat dishes without rice or wine RF radiation power and receiver performance of WLAN devices, it is characterized in that, this system comprises: the protocol of wireless local area network tester, spectrum analyzer, the cellular basestation simulator, system control position, and the interconnective cable of described parts; The annexation of each parts is: described system control position links to each other with the protocol of wireless local area network tester with ICP/IP protocol by cable (netting twine), and control protocol of wireless local area network tester carries out dependence test; This system control position also by cable (GPIB cable) respectively with described cellular basestation simulator, spectrum analyzer links to each other.
System of the present invention is placed in the OTA darkroom, and described each tester is all finished full-automatic testing by the antenna in OTA darkroom to the EUT that is placed on the turntable of darkroom.
Connect in order to simplify circuit, be unlikely to the connection of conversion cable when carrying out different experiments, the present invention also comprises the radio-frequency (RF) switch instrument, described cellular basestation simulator, and spectrum analyzer, the radio frequency precision attenuator links to each other with this radio-frequency (RF) switch instrument respectively by radio frequency cable.
Like this, when carrying out different tests,, just can realize the test of different instrument to EUT as long as change the respective switch of radio-frequency (RF) switch instrument.
The present invention also further comprises the radio frequency precision attenuator, and this radio frequency precision attenuator is connected protocol of wireless local area network tester and radio-frequency (RF) switch instrument by radio frequency cable, and effect is the transmitting power that accurately reduces the protocol of wireless local area network tester.
Adopt the protocol of wireless local area network analyzer as the tester of analyzing the receiving sensitivity Packet Error Ratio in the native system,, reduced the uncertainty that Packet Error Ratio is tested, improved the measuring accuracy of system because its protocal analysis is powerful.
Adopt accurate radio frequency attenuator to carry out the test of receiving sensitivity in the native system, improved the stable and repeated of test greatly, the test uncertainty of whole system is reduced greatly.
A kind of embodiment of the present invention further describes as follows:
As shown in Figure 1, the OTA test macro of the WLAN devices of present embodiment comprises protocol of wireless local area network tester PTW70, radio frequency precision attenuator RSP, spectrum analyzer FSQ26, cellular basestation simulator CMU200, employing is equipped with the system control position of the PC (Dell Dimension 5150) of system controlling software RPS16, radio-frequency (RF) switch instrument TS-RSP and interconnective cable.
The function and the configuration of present embodiment each several part are respectively described below:
Protocol of wireless local area network tester PTW70 is as the nucleus equipment of present embodiment, and major function is to establish a communications link with EUT, and the back is tested RF radiation power and the receiving sensitivity index of EUT connecting.When carrying out the RF radiation power test, protocol analyzer can be issued PTW70 the packet of EUT and packet that EUT issues PTW70 separates fully, on the basis that separates, measure the received signal intensity indication RSSI that EUT issues the packet ACK of PTW70, repeatedly test then, averaged obtains the radiant power numerical value of this EUT.In the receiving sensitivity test process, PTW70 is as tester, at first can on tested channel, the speed with per second 50 frame hardwoods send 200 frames, treat that EUT receives after the Frame, can report the reception condition of each packet of PTW70, i.e. the ACK of each bag, if each packet can both return ACK, prove that then all packets all receive, then reduce the transmitting power of PTW70, till Packet Error Ratio is less than 90%.The computing formula of Packet Error Ratio is: the data frame number that the ACK number that Packet Error Ratio=PTW70 receives/PTW70 sends.
The radio frequency power output that act as reduction protocol of wireless local area network tester PTW70 of radio frequency precision attenuator RSP in native system, because PTW70 is as a protocal analysis instrument, its radio-frequency module making relative accuracy is lower, if so use its inner attenuator, to influence the stable and repeated of test result, serious will cause test failure.The scheme that present embodiment adopts is: the fixedly output of PTW70, at PTW70 and spectrum analyzer FSQ26, between insertion radio frequency precision attenuator RSP on the link, the precision of radio frequency precision attenuator can reach 0.1dB, and has very wide frequency corresponding.This test macro is after this transforms, and stability and repeatability increase greatly, also greatly reduce the test uncertainty accordingly.
The effect of spectrum analyzer FSQ26 in native system mainly is to be implemented in the test to signal templates of stipulating in the standard, because it has the function that vector signal is analyzed, so can realize above function fully.
Cellular basestation simulator CMU200 finishes the OTA test how to carry out cellular mobile station and WLAN (wireless local area network) fusion device of stipulating in the standard and adds.Standard code, if belong to the pattern of fusion equipment of honeycomb and WLAN (wireless local area network) coexistence, need the performance of checking under the state that two kinds of standards are all opened to reduce, promptly WLAN (wireless local area network) is to the assessment to the performance impact of WLAN (wireless local area network) of the performance impact assessment of cellular network and cellular network.When carrying out above test, the performance of carrying out cellular network by the base station simulator of adjusting radio-frequency (RF) switch instrument TS-RSP unlatching cellular network reduces test.
The function that radio-frequency (RF) switch instrument TS-RSP mainly realizes is the switching of carrying out between the different radio frequency links.Because system complex, for realizing that different tests needs radio frequency link is carried out different overlap joints sometimes, if the cable that frequent conversion links to each other with equipment is to realize this purpose, then can increase the test uncertainty greatly, and, cable is a precision element, long-time screwing and will cause its damage repeatedly.If the replacing cable then needs whole system is calibrated again, waste time and energy.So in native system, added a radio-frequency (RF) switch instrument, need the cable of frequent dismounting all to concentrate coupled, realize the connection of different links by its inside relay switch, like this, the stability of system strengthens greatly, simultaneously because it is remote controlled element, so can realize software controlled fully.
The PC that system controlling software RPS16 is installed is the control centre of whole system, and Control Software RPS16 realizes whole system is controlled, and tests automatically.PC is connected with the continuous realization of PTW70 TCP/IP by netting twine to be controlled PTW70, and other equipment all link to each other with controlling computer by the GPIB line.When testing automatically, relevant test parameter all is provided with in RPS16 software, and RPS16 can send to corresponding instrument with the form of ordering with test parameter, to realize co-operation, finishes test automatically, generates test result figure.
Claims (4)
1, a kind of aerial radio-frequency performance test macro of WLAN devices, it is characterized in that, can abide by eat dishes without rice or wine RF radiation power and receiver performance of international standard to WLAN devices detects, this system comprises: the protocol of wireless local area network tester, spectrum analyzer, the cellular basestation simulator, system control position, and the interconnective cable of described parts; The annexation of each parts is: described system control position links to each other with the protocol of wireless local area network tester with ICP/IP protocol by netting twine, and control protocol of wireless local area network tester carries out dependence test; This system control position also by the GPIB cable respectively with described cellular basestation simulator, spectrum analyzer links to each other.
2, the system as claimed in claim 1 is characterized in that, this system also comprises the radio-frequency (RF) switch instrument, described cellular basestation simulator, and spectrum analyzer, the radio frequency precision attenuator links to each other with this radio-frequency (RF) switch instrument respectively by radio frequency cable.
3, system as claimed in claim 2 is characterized in that, this system also further comprises the radio frequency precision attenuator, and this radio frequency precision attenuator is connected between protocol of wireless local area network tester and the radio-frequency (RF) switch instrument by radio frequency cable.
As claim 1,2 or 3 described systems, it is characterized in that 4, described system control position adopts the PC computer that system controlling software RPS16 is installed.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101184006B (en) * | 2007-12-07 | 2010-08-25 | 深圳国人通信有限公司 | Test method and system for WLAN equipment index |
| CN101106792B (en) * | 2007-08-23 | 2012-05-23 | 中兴通讯股份有限公司 | Parameter measurement method for wireless video terminal |
| CN102571233A (en) * | 2011-12-29 | 2012-07-11 | 西安欣创电子技术有限公司 | Fast assessment method for overall unit OTA (Over The Air) performance of wireless terminal products |
| CN102577579A (en) * | 2009-08-05 | 2012-07-11 | 英特尔公司 | Method and system for determining total isotropic sensitivity using RSSI measurements for WiMAX device certification |
| US8559885B2 (en) | 2011-04-14 | 2013-10-15 | Accel Telecom Ltd. | System and method for measurement of parameters of radio-frequency transmission devices |
| CN103973377A (en) * | 2013-02-04 | 2014-08-06 | 中国移动通信集团公司 | Base station testing method, base station testing device and base station testing system |
| CN106603170A (en) * | 2016-11-29 | 2017-04-26 | 上海斐讯数据通信技术有限公司 | Automatic test method and system of receiving sensitivity |
| CN107683587A (en) * | 2015-05-26 | 2018-02-09 | 莱特普茵特公司 | Method for testing radio frequency (RF) data packet signal transceiver via wireless signal path |
| CN107896132A (en) * | 2017-11-07 | 2018-04-10 | 上海同耀通信技术有限公司 | LAN protocol detecting system |
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2006
- 2006-08-07 CN CN 200610089147 patent/CN1905494A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106792B (en) * | 2007-08-23 | 2012-05-23 | 中兴通讯股份有限公司 | Parameter measurement method for wireless video terminal |
| CN101184006B (en) * | 2007-12-07 | 2010-08-25 | 深圳国人通信有限公司 | Test method and system for WLAN equipment index |
| CN102577579B (en) * | 2009-08-05 | 2015-04-22 | 英特尔公司 | Method and system for determining total isotropic sensitivity using RSSI measurements for WiMAX device certification |
| CN102577579A (en) * | 2009-08-05 | 2012-07-11 | 英特尔公司 | Method and system for determining total isotropic sensitivity using RSSI measurements for WiMAX device certification |
| US8559885B2 (en) | 2011-04-14 | 2013-10-15 | Accel Telecom Ltd. | System and method for measurement of parameters of radio-frequency transmission devices |
| CN102571233B (en) * | 2011-12-29 | 2014-08-20 | 西安欣创电子技术有限公司 | Fast assessment method for overall unit OTA (Over The Air) performance of wireless terminal products |
| CN102571233A (en) * | 2011-12-29 | 2012-07-11 | 西安欣创电子技术有限公司 | Fast assessment method for overall unit OTA (Over The Air) performance of wireless terminal products |
| CN103973377A (en) * | 2013-02-04 | 2014-08-06 | 中国移动通信集团公司 | Base station testing method, base station testing device and base station testing system |
| CN103973377B (en) * | 2013-02-04 | 2016-03-30 | 中国移动通信集团公司 | A kind of base station test method, Apparatus and system |
| CN107683587A (en) * | 2015-05-26 | 2018-02-09 | 莱特普茵特公司 | Method for testing radio frequency (RF) data packet signal transceiver via wireless signal path |
| CN107683587B (en) * | 2015-05-26 | 2021-12-07 | 莱特普茵特公司 | Method for testing a Radio Frequency (RF) data packet signal transceiver via a wireless signal path |
| CN106603170A (en) * | 2016-11-29 | 2017-04-26 | 上海斐讯数据通信技术有限公司 | Automatic test method and system of receiving sensitivity |
| CN107896132A (en) * | 2017-11-07 | 2018-04-10 | 上海同耀通信技术有限公司 | LAN protocol detecting system |
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