CN102122994A - Device and method for testing multichannel radiation characteristic of multi-input multi-output (MIMO) equipment - Google Patents
Device and method for testing multichannel radiation characteristic of multi-input multi-output (MIMO) equipment Download PDFInfo
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- CN102122994A CN102122994A CN2010100038640A CN201010003864A CN102122994A CN 102122994 A CN102122994 A CN 102122994A CN 2010100038640 A CN2010100038640 A CN 2010100038640A CN 201010003864 A CN201010003864 A CN 201010003864A CN 102122994 A CN102122994 A CN 102122994A
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Abstract
The invention provides a device and method for testing a multichannel radiation characteristic of multi-input multi-output (MIMO) equipment. The method comprises the following steps: establishing test channels; storing test data received by each channel circuit of a receiver of a tested terminal; and analyzing the stored test data of each channel to obtain the multichannel characteristic of the tested terminal after the test data acquisition is finished. The device comprises a signal generator, the tested terminal, a storage device and a signal analysis device, wherein the signal generator is used for sending test signals; the tested terminal is used for receiving the test signals and storing the test data received by each channel circuit in the storage device; and the signal analysis device is used for analyzing the stored test data received by each channel circuit to obtain the multichannel characteristic of the tested terminal after the acquisition of the test data of the tested terminal is finished. By using the technical scheme, the characteristic of each channel of the terminal can be analyzed exactly.
Description
Technical field
The present invention relates to complete machine transceiver channel characteristic test technology in the radio communication, relate in particular to a kind of test multiple-input, multiple-output (MIMO, Multiple In ﹠amp; Multiple Out) method and the device of the multichannel radiation characteristic of equipment.
Background technology
Today that communication requirement is growing, people constantly seek to increase the method for channel capacity on the limited basis of frequency resource.Wherein, the MIMO technology has obtained everybody concern and has been used widely.Application in the later wireless communication technology of 3G is such as HSPA (high-speed packet inserts, and is commonly referred to as 3.5 generation techniques), LTE communication systems such as (evolution over a long time of 3G).Meanwhile, in test and appraisal, increased inevitably realizing the performance measuring and evaluating of the communication port of MIMO on the portable terminal to the portable terminal in these systems.Wherein, the communication port part of realization MIMO comprises: MIMO antenna, and the reception/transtation mission circuit corresponding with each antenna, baseband circuit and codec.Assessment method to its performance is specially: anolog base station and space channel, make portable terminal by space channel that simulates and the base station communication that simulates, and record the data throughout of portable terminal, weigh the performance that realizes the part of MIMO on the portable terminal by the throughput that records.
But in the above-mentioned test, MIMO antenna in the part of described realization MIMO, and the receiving circuit of each antenna correspondence of comprising of MIMO antenna, the performance of baseband circuit and codec all can influence described throughput, especially codec can carry out error correction coding to the information that receives, and then improve described throughput, as seen, the throughput that records in the said method can not strictly reflect the multichannel radiation characteristic of MIMO, because multichannel radiation characteristic is with MIMO antenna itself and receiving circuit, the electrical characteristic of baseband circuit is relevant, and irrelevant with the digital signal processing algorithm in the communication equipment.Simultaneously, general test usually is connected instruments such as frequency spectrograph, oscilloscope, comprehensive test instrument on the equipment under test when catching test data, thereby cause the electromagnetic property of equipment under test this moment variant when not being connected tester, thereby can not test out the true electromagnetic property of equipment under test accurately.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of device and method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, can analyze the characteristic of each passage of terminal exactly.
In order to address the above problem, the invention provides a kind of method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, comprising:
Set up test access, the test data that each channel circuit of dut terminal receiver receives is stored, the collecting test data back that finishes draws the multichannel characteristic of described dut terminal to the test data analysis of each passage of storage.
Further, when setting up test access, if the test environment of selecting is non-free space environment, the access wireless channel simulator is converted to the propagation channel equivalence of the signal of dut terminal reception and the corresponding channel of selected test model between signal generator and omnidirectional antenna.
Further, described each channel circuit of dut terminal receiver is handled the back input with the signal of antenna reception and is sampled as digital signal with this passage corresponding simulating base band analog to digital converter;
The read module of described dut terminal is stored in the memory device as test data after reading described digital signal;
Described memory device is positioned at described dut terminal or is positioned at described dut terminal outside.
Further, after the collecting test data finished, the test data that each channel circuit of storing is received was sent to the characteristic that signal analysis equipment is analyzed described each passage of dut terminal.
The present invention also provides a kind of device of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, comprises signal generator, dut terminal, memory device and signal analysis equipment;
Described signal generator is used for emissioning testing signal;
Described dut terminal is used to receive described test signal and test data that each channel circuit is received is stored to described memory device;
Described signal analysis equipment is used for the multichannel characteristic that described dut terminal adopt test data to finish test data analysis that the back receives each channel circuit of storage draws described dut terminal.
Further, when test environment is non-free space environment, described device also comprises radio channel emulator, is used to receive the test signal of described signal generator emission, and the propagation channel equivalence of dut terminal received signal is converted to and the corresponding channel of selected test model.
Further, described dut terminal comprises receiver, one or more Analog Baseband analog to digital converter, read module;
Described receiver is used to receive described test signal and signal that each antenna the is received channel circuit by correspondence is sent to corresponding simulating base band analog to digital converter;
Described Analog Baseband analog to digital converter, the conversion of signals that is used for receiving is a digital signal;
Described read module is used to read described digital signal and is stored to memory device as test data.
Further, described memory device is positioned at described dut terminal or is positioned at described dut terminal outside;
In the time of outside memory device is positioned at dut terminal, dut terminal links to each other with memory device by wireless or wired mode, and test data is sent to memory device.
In sum, the invention provides a kind of device and method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, can record MIMO terminal multichannel characteristic during launching electromagnetic wave under the real work scene, and then reflect the ardware feature of MIMO terminal, thereby provide with reference in order to indicate improvement direction for the designer.
Description of drawings
Fig. 1 is a test logic connection layout of the present invention;
Fig. 2 tests the link position schematic diagram for the present invention;
Fig. 3 reads figure for the present invention tests test data.
Embodiment
The invention provides a kind of device and method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, can analyze the characteristic of each passage of dut terminal exactly.
Present embodiment provides a kind of device of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, as shown in Figure 1, comprises signal generator, dut terminal, memory device and signal analysis equipment;
Signal generator is used for emissioning testing signal;
Dut terminal is used for the acceptance test signal and test data that each channel circuit is received is stored to memory device;
Signal analysis equipment is used for the multichannel characteristic that dut terminal adopt test data to finish test data analysis that the back receives each channel circuit of storage draws dut terminal.
When test environment was non-free space environment, described device also comprised radio channel emulator, was used for the test signal of received signal generator emission, and the propagation channel equivalence of dut terminal received signal is converted to and the corresponding channel of selected test model.
Dut terminal comprises receiver, one or more Analog Baseband analog to digital converter, read module;
Receiver is used for the acceptance test signal and signal that each antenna the is received channel circuit by correspondence is sent to corresponding simulating base band analog to digital converter;
The Analog Baseband analog to digital converter, the conversion of signals that is used for receiving is a digital signal;
Read module is used to read digital signal and is stored to memory device as test data.
Memory device is positioned at dut terminal or is positioned at the dut terminal outside;
When memory device was positioned at dut terminal inside, dut terminal was stored in test data in the local storage, and local storage can be ROM or RAM or the like.After the collecting test data finish, test data is sent to analytical equipment or is read the test data of storage by the analytical equipment self terminal.
In the time of outside memory device is positioned at dut terminal, dut terminal can link to each other with memory device by wireless or wired mode according to circumstances, with the storage data.Signal analysis equipment draws the characteristic of each passage of dut terminal according to the test data analysis that receives.
Present embodiment provides a kind of method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment, may further comprise the steps:
Step 1: test is prepared.
Because the radiance of UE (user equipment is exactly user terminals such as said mobile phone usually) antenna and the residing circuit board of antenna and be closely related with load that antenna joins, they are an indivisible integral body.Therefore to obtain the real radiation characteristic of UE, can not change the electric conductor structure of UE self, such as on UE, connecting the electric conductor structure that various types of other test cable etc. all can change UE self.
But in order to obtain test data, just need do corresponding processing on UE, promptly in order to test data is directly stored, can be to be kept in the memory of UE self, also can be to be stored to External memory equipment, and the present invention does not limit this.After test data collection finishes, read the test data of storage and test.For example can be by in UE, implanting the small routine of test usefulness, this program is responsible for reading the initial data after the AD sampling of Analog Baseband part among the UE, and it is stored in the middle of the local storage.Local storage can be ROM or RAM or the like.Such as: if adopt RAM, the power down of then after testing, can not shutting down, but need to wait for will test data wherein read finish after just power down.
Step 2: the electromagnetic environment of determining tested UE work.
Test access (comprising the residing environment of UE) comprises signal emitting-source, signal transmission channel, the residing environment of UE to be measured etc.Such as following two kinds, first kind of situation is the free space environment: signal transmission channel is accessible free space, reverberation that UE does not nearby have yet; Second kind of situation is non-free space environment, is put in as anthropomorphic phantom's type and multi-path environment: UE in the actual working environment of artificial simulations such as headform, simulates multipath propagation environment with the multipath channel simulator simultaneously; Electromagnetic environment when the tester can select UE tested according to concrete application purpose, thus corresponding test environment set up.Present embodiment is an example with the free space environment of band headform with the meaning represented.
Step 3: set up test access.
Antenna, the test bracket that supports UE or headform etc. that signal generator will be connected put into the microwave dark room that its attenuation band comprises target frequency, as shown in Figure 2.The logic of signal path connects as shown in Figure 1, the output of signal generator is connected upward omnidirectional antenna, between signal generator and omnidirectional antenna, can insert corresponding radio channel emulator as required, be converted to and the corresponding channel of selected test model in order to the propagation channel equivalence of signal that dut terminal is received as emission.Test the dut terminal MIMO multichannel radiation characteristic in the free space here, directly the output with signal generator is connected on the omnidirectional antenna, again tested UE is placed on the far-field radiation district of omnidirectional antenna, be generally beyond 10 wavelength, such as the tranmitting frequency for 2600Mhz, 3 meters distance also is fine so.
Step 4: test.
Open tested UE power supply, start the testing equipment that is used to test among the tested UE, as receiver, Analog Baseband AD converter, read module etc.; And guarantee that each testing equipment is in normal operating conditions (normally receiving the state of data as receive path).
The signalization generator is launched echo signal continuously, such as the single-tone sinusoidal signal of certain designated carrier frequency or the LTE signal of 5Mhz bandwidth etc.Signal arrives aerial through transmission antennas transmit, MIMO antenna by tested UE receives, enter receiver, again through after the processing such as each channel circuit filtering mixing of reception, AD (analog to digital converter) sampling that simulated base band becomes digital signal (being test data), by read module test data is read in the memory then, this memory can be positioned at tested UE, also can be to be positioned at tested UE outside.Memory device adopts the ROM (read-only memory) of dut terminal in the present embodiment.
According to concrete test request, can set the time of collecting test data arbitrarily, such as being 1 LTE physics frame length 10ms, perhaps a sub-frame length 5ms.
Usually, a plurality of channel circuits of receiver are to there being a plurality of AD (analog to digital converter), and the data correspondence of each passage is obtained by the sampling of one tunnel AD converter.
Step 5: test data is read to analytical equipment;
Analytical equipment can be the equipment except that this dut terminal, and as computer, as shown in Figure 3, can read to computer this moment by the test data that USB or UART data communication interfaces such as (universal asynchronous receiving-transmittings) will be stored in dut terminal.Analytical equipment can also be a dut terminal itself, only needs this moment to come computational analysis to get final product by analysis module read test data from memory device of terminal.
Because test data has been stored and finished before this, come reading of data can not influence test result before with any connected mode this moment again, and this is the test data that has comprised the most real aerial radiation characteristic of tested UE.
Step 6: analyzing test data, acquisition comprises the tested UE multi-channel performance index of aerial radiation characteristic.
The data that front 5 steps obtain are comprising all characteristics of each passage in the aspect of signal, so can adopt different processing modes to the test data that collects according to concrete demand, finally obtain the characteristic of each passage.
Such as, tested UE with 2 antennas, 2 passages is an example, to time-domain signal s1 (t) and the s2 (t) that from tested UE, reads from antenna 1 and antenna 2 pairing passages 1 and passage 2, carry out discrete Fourier transform (DFT), obtain its frequency domain data f1 (k) and f2 (k), f1 (k) and f2 (k) are expressed as the form of array in computer.Wherein, f1 (k) representative is from the digital spectrum of the signal of passage 1, and f2 (k) representative is from the digital spectrum of the signal of passage 2.When being FFT, can be according to the characteristics of the communication system that tested UE worked, such as the LTE signal of preceding step 4 described specific bandwidth B, the sample frequency that the AD device of tested UE own is adopted, and this test request frequency resolution that will reach etc., decide the time span of FFT.For example, if the AD sample frequency is S Msps (because that Qwest's sampling thheorem, S＞=2B), subcarrier spacing is C Khz, can adopt the discrete Fourier transform (DFT) of S/C to count so, the time span of about 1/C just can make the resolution of f1 (k) and f2 (k) reach the requirement of differentiating subcarrier.The just amplitude that when receiving or launching the signal of corresponding each frequency content, showed of passage 1 and passage 2 and the difference of phase place as can be seen on the difference of f1 (k) and f2 (k).The information that is containing tester's needs.
Claims (8)
1. method of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment comprises:
Set up test access, the test data that each channel circuit of dut terminal receiver receives is stored, the collecting test data back that finishes draws the multichannel characteristic of described dut terminal to the test data analysis of each passage of storage.
2. the method for claim 1 is characterized in that:
When setting up test access, if the test environment of selecting is non-free space environment, the access wireless channel simulator is converted to the propagation channel equivalence of the signal of dut terminal reception and the corresponding channel of selected test model between signal generator and omnidirectional antenna.
3. the method for claim 1 is characterized in that:
The signal that described each channel circuit of dut terminal receiver receives antenna is handled the back input and is sampled as digital signal with this passage corresponding simulating base band analog to digital converter;
The read module of described dut terminal is stored in the memory device as test data after reading described digital signal;
Described memory device is positioned at described dut terminal or is positioned at described dut terminal outside.
4. method as claimed in claim 3 is characterized in that:
After the collecting test data finished, the test data that each channel circuit of storing is received was sent to the characteristic that signal analysis equipment is analyzed described each passage of dut terminal.
5. a device of testing the multichannel radiation characteristic of multiple-input, multiple-output equipment comprises signal generator, dut terminal, memory device and signal analysis equipment; It is characterized in that:
Described signal generator is used for emissioning testing signal;
Described dut terminal is used to receive described test signal and test data that each channel circuit is received is stored to described memory device;
Described signal analysis equipment is used for the multichannel characteristic that described dut terminal adopt test data to finish test data analysis that the back receives each channel circuit of storage draws described dut terminal.
6. device as claimed in claim 5 is characterized in that:
When test environment is non-free space environment, described device also comprises radio channel emulator, be used to receive the test signal of described signal generator emission, and the propagation channel equivalence of dut terminal received signal is converted to and the corresponding channel of selected test model.
7. device as claimed in claim 5 is characterized in that:
Described dut terminal comprises receiver, one or more Analog Baseband analog to digital converter, read module;
Described receiver is used to receive described test signal and signal that each antenna the is received channel circuit by correspondence is sent to corresponding simulating base band analog to digital converter;
Described Analog Baseband analog to digital converter, the conversion of signals that is used for receiving is a digital signal;
Described read module is used to read described digital signal and is stored to memory device as test data.
8. device as claimed in claim 7 is characterized in that:
Described memory device is positioned at described dut terminal or is positioned at described dut terminal outside;
In the time of outside memory device is positioned at dut terminal, dut terminal links to each other with memory device by wireless or wired mode, and test data is sent to memory device.
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| CN2010100038640A CN102122994A (en) | 2010-01-08 | 2010-01-08 | Device and method for testing multichannel radiation characteristic of multi-input multi-output (MIMO) equipment |
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| CN2010100038640A CN102122994A (en) | 2010-01-08 | 2010-01-08 | Device and method for testing multichannel radiation characteristic of multi-input multi-output (MIMO) equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871583A (en) * | 2012-10-08 | 2015-08-26 | 网件公司 | Near-field mimo wireless test systems, structures, and processes |
| CN107689835A (en) * | 2016-08-03 | 2018-02-13 | 罗德施瓦兹两合股份有限公司 | measuring system and method |
| WO2018107927A1 (en) * | 2016-12-14 | 2018-06-21 | 深圳市通用测试系统有限公司 | Wireless performance testing method for mimo wireless terminal |
| CN114374451A (en) * | 2022-01-10 | 2022-04-19 | 中国人民解放军国防科技大学 | Large-scale MIMO channel simulation method and device based on optical matrix switching |
-
2010
- 2010-01-08 CN CN2010100038640A patent/CN102122994A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871583A (en) * | 2012-10-08 | 2015-08-26 | 网件公司 | Near-field mimo wireless test systems, structures, and processes |
| CN107689835A (en) * | 2016-08-03 | 2018-02-13 | 罗德施瓦兹两合股份有限公司 | measuring system and method |
| CN107689835B (en) * | 2016-08-03 | 2021-08-13 | 罗德施瓦兹两合股份有限公司 | Measurement system and method |
| WO2018107927A1 (en) * | 2016-12-14 | 2018-06-21 | 深圳市通用测试系统有限公司 | Wireless performance testing method for mimo wireless terminal |
| KR20180111958A (en) * | 2016-12-14 | 2018-10-11 | 제너럴 테스트 시스템 아이엔씨. | Wireless performance test method of MIMO wireless terminal |
| KR102111874B1 (en) | 2016-12-14 | 2020-05-18 | 제너럴 테스트 시스템 아이엔씨. | Method for testing wireless performance of MIMO wireless terminals |
| US10797808B2 (en) | 2016-12-14 | 2020-10-06 | General Test Systems Inc. | Method for testing wireless performance of MIMO wireless terminal |
| CN114374451A (en) * | 2022-01-10 | 2022-04-19 | 中国人民解放军国防科技大学 | Large-scale MIMO channel simulation method and device based on optical matrix switching |
| CN114374451B (en) * | 2022-01-10 | 2023-08-22 | 中国人民解放军国防科技大学 | Large-scale MIMO channel simulation method and device based on optical matrix switching |
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Application publication date: 20110713 |