CN101854654A - EVM (Error Vector Magnitude) test system and method of fast moving LTE (Long Term Evolution)-TD mobile terminal - Google Patents
EVM (Error Vector Magnitude) test system and method of fast moving LTE (Long Term Evolution)-TD mobile terminal Download PDFInfo
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- CN101854654A CN101854654A CN200910132989A CN200910132989A CN101854654A CN 101854654 A CN101854654 A CN 101854654A CN 200910132989 A CN200910132989 A CN 200910132989A CN 200910132989 A CN200910132989 A CN 200910132989A CN 101854654 A CN101854654 A CN 101854654A
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Abstract
The invention discloses EVM (Error Vector Magnitude) test system and method of a fast moving LTE (Long Term Evolution)-TD mobile terminal. The test system comprises an LTE-TD base station simulator, a Doppler channel simulator and an ascending-descending conversion circuit, wherein the LTE-TD base station simulator is respectively connected with the ascending-descending conversion circuit and the Doppler channel simulator; the Doppler channel simulator is connected with the ascending-descending conversion circuit, wherein the LTE-TD base station simulator is used for stimulating functions and performance of an LTE-TD base station and measuring EVM; the Doppler channel simulator stimulates fast movement of the LTE-TD mobile terminal by overlapping a frequency value on the output frequency of the LTE-TD base station simulator; and the ascending-descending conversion circuit is used for switching ascending and descending channels to stimulate ascending-descending transmission.
Description
Technical field
The present invention relates to field of mobile communication, be particularly related to a kind of LTE-TD (LTE TD-SCDMA, the CDMA (Code Division Multiple Access) that the time-division of Long Term Evolution is synchronous) method of testing and the test macro of portable terminal Error Vector Magnitude (Error Vector magnitude is called for short EVM) under the high-speed motion condition.
Background technology
The fast development of cellular mobile network, WLAN (wireless local area network) and the broadcasting and television network communication technology has stimulated people on the portable terminal based on above-mentioned communication network technology, at any applied environment, watches the demand of mobile service content.
At present commercial cellular mobile terminal technology, the application ring scape of consideration be the low speed scene be portable terminal relatively the movement velocity of its base station less than 200km/h.
The bullet train that surpasses 200km/h along with speed per hour constantly puts it into commercial operation, and the LTE-TD cellular mobile terminal technology that the bullet train environment is satisfied in exploitation more and more becomes a key technical problem of being badly in need of solution.Solve a most important condition of this technology, be to form modeling method, verification method and the method for testing that can characterize, test and verify this technology, so that can provide the basic means of system emulation and design, performance evaluation and checking, fault detect and location and the basis that technical optimization is provided for solving this technology.
But, also do not have LTE-TD portable terminal EVM determination method for parameter under the high-speed motion condition at present.
Summary of the invention
Technical problem to be solved by this invention provides a kind of EVM test macro and method of high-speed motion LTE-TD portable terminal.
For solving the problems of the technologies described above, the invention provides a kind of Error Vector Magnitude EVM test macro of high-speed motion LTE-TD portable terminal, comprise LTE-TD base station simulator, Doppler Doppler channel simulator and up-downgoing change-over circuit, described LTE-TD base station simulator links to each other with described Doppler channel simulator with described up-downgoing change-over circuit respectively, described Doppler channel simulator links to each other with described up-downgoing change-over circuit, wherein:
Described LTE-TD base station simulator is used to simulate the function and the performance of LTE-TD base station, comprises the upstream data that sends downlink data and mobile terminal receive, according to up-downgoing data computation bit error rate, and measures EVM;
Described Doppler channel simulator is simulated the high-speed mobile of LTE-TD portable terminal by stack one frequency values on the output frequency of described LTE-TD base station simulator;
Described up-downgoing change-over circuit is used to carry out the up-downgoing channel and switches, with simulation up-downgoing transmission.
Further, described Doppler channel simulator comprises upconverter, low-converter, Doppler signal generator, frequency mixer and radio-frequency (RF) local oscillator source, wherein, the input signal of Doppler channel simulator is imported from described upconverter, described upconverter, frequency mixer, low-converter connect successively, described Doppler signal generator outputs signal to described frequency mixer, to described upconverter and low-converter, the output signal of described low-converter is the output signal of Doppler channel simulator to described radio-frequency (RF) local oscillator source output signal respectively.
Further, the frequency input signal f of described Doppler channel simulator
In, input signal power p
In, output signal frequency f
Out, output signal power p
Out, and the output signal frequency fd of Doppler signal generator satisfies following relation: f
Out=f
In± f
d, p
Out=p
In
Further, described Doppler channel simulator is a swept signal source, the output signal frequency of described Doppler signal generator is by frequency sweep amplitude and frequency sweep cycle decision, described frequency sweep amplitude directly characterizes the translational speed of LTE-TD portable terminal, and described frequency sweep cycle characterizes the switch speed of LTE-TD portable terminal in the minizone.
Further, described LTE-TD base station simulator adopts comprehensive test instrument to realize.
Further, described up-downgoing change-over circuit adopts duplexer or switch element to realize.
For solving the problems of the technologies described above, the present invention also provides a kind of Error Vector Magnitude EVM method of testing of high-speed motion LTE-TD portable terminal, be applicable to test macro as claimed in claim 1, described system comprises LTE-TD base station simulator, Doppler Doppler channel simulator and up-downgoing change-over circuit; Described method comprises:
The LTE-TD portable terminal is connected to described test macro, and makes described test macro and LTE-TD portable terminal be in the normal wireless link working state;
Stack one frequency values is measured the bit error rate of LTE-TD portable terminal this moment with the high-speed mobile of simulation LTE-TD portable terminal on the output frequency of described LTE-TD base station simulator;
The regulating frequency parameter remains in the critical field bit error rate of LTE-TD portable terminal, measures the EVM of this moment.
Further, the described frequency values that superposes on the output frequency of LTE-TD base station simulator is to realize by the frequency sweep cycle and the frequency sweep amplitude of regulating Doppler channel simulator Doppler frequency displacement in the described test macro.
Further, described regulating frequency parameter remains in the critical field bit error rate of LTE-TD portable terminal and is meant: keep Doppler channel simulator Doppler frequency displacement constant, the power output of regulating the LTE-TD base station simulator; Perhaps, keep the power output of LTE-TD base station simulator constant, regulate the frequency displacement of Doppler channel simulator.
Further, the frequency displacement of described adjusting Doppler channel simulator is meant: regulate the sweep amplitude of Doppler channel simulator Doppler frequency displacement, keep the scan period constant.
The present invention is according to Doppler effect, the translational speed of utilizing the size of frequency to come simulating mobile terminal.It is low to have environmental requirement, Easy Test, simple and easy to do advantage.In addition, system of the present invention can be compatible fully with the existing equipment interface, has the advantage of highly versatile.
Description of drawings
Fig. 1 is a present embodiment test macro schematic diagram;
Fig. 2 is a Doppler channel simulator schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
For present LTE-TD system,, when perhaps being higher than 200km/h, can think that this MS is in high-speed moving state when LTE-TD MS (Mobile Station, travelling carriage or title portable terminal are hereinafter to be referred as MS) speed is higher than 150km/h.
As shown in Figure 1, the test macro of present embodiment comprises LTE-TD base station simulator (claiming LTE-TD system simulator again), Doppler (Doppler) channel simulator and up-downgoing change-over circuit.Wherein, the LTE-TD base station simulator links to each other with the Doppler channel simulator with the up-downgoing change-over circuit respectively, and the Doppler channel simulator links to each other with the up-downgoing change-over circuit.Above-mentioned connection is meant by low loss cable and connects.
Described LTE-TD base station simulator (hereinafter to be referred as base station simulator) is used to simulate the function and the performance of LTE-TD base station, comprises the upstream data that sends downlink data and mobile terminal receive, according to up-downgoing data computation bit error rate, and measures EVM; This base station simulator can adopt comprehensive test instrument to realize;
The Doppler channel simulator is simulated the high-speed mobile of LTE-TD portable terminal by stack one frequency values on the output frequency of base station simulator; This Doppler channel simulator can adopt swept signal source to realize;
The up-downgoing change-over circuit is used to carry out the up-downgoing channel and switches, and with simulation up-downgoing transmission, for example adopts duplexer or switch element to realize.
The Doppler channel simulator comprises upconverter, low-converter, Doppler signal generator, frequency mixer and RF (radio frequency) local vibration source as shown in Figure 2.Wherein, the input signal of Doppler channel simulator is imported from upconverter, upconverter, frequency mixer, low-converter connect successively, the Doppler signal generator outputs signal to frequency mixer, the local vibration source output signal is respectively to upconverter and low-converter, and the output signal of low-converter is the output signal of Doppler channel simulator.
From the frequency input signal of Doppler channel simulator input port input is f
In, input signal power is p
In, through output signal frequency (or claiming local frequency) f of low-converter and local vibration source
LoRealize that (output signal power of local vibration source is p in mixing
Lo), low-converter output signal frequency (or claiming IF-FRE) is f
If, output signal power (or claiming intermediate frequency power) is p
Iff
IfRealize and Doppler signal generator output signal frequency f through frequency mixer again
dMixing, the mixer output signal frequency is f
If± f
d, output signal power is p
IfdThe output signal frequency of frequency mixer is through upconverter, with the output signal frequency f of local vibration source
LoRealize mixing, upconverter device output signal frequency f
OutBe the output signal frequency of Doppler channel simulator, upconverter device output signal power p
OutBe the output signal power of Doppler channel simulator.
The frequency input signal f of described Doppler channel simulator
In, input signal power p
In, output signal frequency f
Out, output signal power p
Out, and the output signal frequency f of Doppler signal generator
dSatisfy following relation: f
Out=f
In± f
d, p
Out=p
In
The output signal frequency f of Doppler signal generator
dSimulated the speed of service of portable terminal, this f
dBy the frequency sweep amplitude A
dWith the frequency sweep cycle decision, by changing the frequency sweep amplitude A
dAnd/or frequency sweep cycle, can change f
dSize, wherein, the scope of frequency sweep amplitude reflection frequency change, it directly characterizes the translational speed of MS; The speed of frequency sweep cycle reflection frequency change characterizes the switch speed of MS in the minizone.
During test, it is indoor that described test macro and MS all are positioned at electromagnetic shielding, and described test macro links to each other with MS, and particularly, MS links to each other by low loss cable with up-downgoing change-over circuit in the test macro.
Be example with MS receiving demodulation dedicated transmission channel (DCH) below, describe the method for testing of MS EVM in conjunction with Fig. 1 and Fig. 2.
Described MS is connected to up-downgoing change-over circuit in the test macro, and the communication link parameter of base station simulator and MS is set so that test macro and MS are in the normal wireless link working state;
Regulating Doppler channel simulator Doppler frequency displacement (is f
d) frequency sweep cycle and frequency sweep amplitude A
d, the state when being in high-speed mobile with simulation MS is measured the bit error rate of MS at this moment;
For example, the scan period is set to 11 seconds, regulates sweep amplitude A
dBe 715Hz.At this moment, the output signal frequency f of Doppler signal generator in the Doppler channel simulator
dMaximum be 715Hz, minimum value is-715Hz, the translational speed of expression MS this moment is 0-250km/h.The corresponding relation of speed and Doppler frequency can obtain by existing speed and Doppler frequency curve.The output signal frequency of regulating local vibration source in the Doppler channel simulator is 2140Mhz.
On LTE-TD channel to be measured, the regulating frequency parameter makes the bit error rate of MS keep measuring EVM with this understanding less than 0.01.
Can control bit error rate by following one of mode down: the f that keeps the Doppler signal generator
dConstant, as to regulate base station simulator power output, the i.e. input power of Doppler channel simulator; Keep the input power of Doppler channel simulator constant, regulate the f of Doppler signal generator
d, for example constant by the scan period that keeps Doppler channel simulator Doppler frequency displacement, regulate sweep amplitude A
dRealize.
If the bit error rate value greater than 0.01, then can pass through to improve the power output of base station simulator, or increase Doppler channel simulator Doppler frequency displacement, promptly improve the output frequency f of Doppler signal generator
dRealize.
Making the bit error rate maintenance of MS is in order to satisfy the requirement of standard less than 0.01.
The value of EVM in the time of can obtaining the MS high-speed mobile by said method.
LTE-TD portable terminal as herein described comprises cellular handset, card of surfing Internet etc.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the Error Vector Magnitude EVM test macro of a high-speed motion LTE-TD portable terminal, it is characterized in that, comprise LTE-TD base station simulator, Doppler Doppler channel simulator and up-downgoing change-over circuit, described LTE-TD base station simulator links to each other with described Doppler channel simulator with described up-downgoing change-over circuit respectively, described Doppler channel simulator links to each other with described up-downgoing change-over circuit, wherein:
Described LTE-TD base station simulator is used to simulate the function and the performance of LTE-TD base station, comprises the upstream data that sends downlink data and mobile terminal receive, according to up-downgoing data computation bit error rate, and measures EVM;
Described Doppler channel simulator is simulated the high-speed mobile of LTE-TD portable terminal by stack one frequency values on the output frequency of described LTE-TD base station simulator;
Described up-downgoing change-over circuit is used to carry out the up-downgoing channel and switches, with simulation up-downgoing transmission.
2. the system as claimed in claim 1 is characterized in that,
Described Doppler channel simulator comprises upconverter, low-converter, Doppler signal generator, frequency mixer and radio-frequency (RF) local oscillator source, wherein, the input signal of Doppler channel simulator is imported from described upconverter, described upconverter, frequency mixer, low-converter connect successively, described Doppler signal generator outputs signal to described frequency mixer, to described upconverter and low-converter, the output signal of described low-converter is the output signal of Doppler channel simulator to described radio-frequency (RF) local oscillator source output signal respectively.
3. system as claimed in claim 2 is characterized in that,
The frequency input signal f of described Doppler channel simulator
In, input signal power p
In, output signal frequency f
Out, output signal power p
Out, and the output signal frequency f of Doppler signal generator
dSatisfy following relation: f
Out=f
In± f
d, p
Out=p
In
4. as claim 2 or 3 described systems, it is characterized in that,
Described Doppler channel simulator is a swept signal source, the output signal frequency of described Doppler signal generator is by frequency sweep amplitude and frequency sweep cycle decision, described frequency sweep amplitude directly characterizes the translational speed of LTE-TD portable terminal, and described frequency sweep cycle characterizes the switch speed of LTE-TD portable terminal in the minizone.
5. the system as claimed in claim 1 is characterized in that,
Described LTE-TD base station simulator adopts comprehensive test instrument to realize.
6. the system as claimed in claim 1 is characterized in that,
Described up-downgoing change-over circuit adopts duplexer or switch element to realize.
7. the Error Vector Magnitude EVM method of testing of a high-speed motion LTE-TD portable terminal, it is characterized in that, be applicable to test macro as claimed in claim 1, described system comprises LTE-TD base station simulator, Doppler Doppler channel simulator and up-downgoing change-over circuit; Described method comprises:
The LTE-TD portable terminal is connected to described test macro, and makes described test macro and LTE-TD portable terminal be in the normal wireless link working state;
Stack one frequency values is measured the bit error rate of LTE-TD portable terminal this moment with the high-speed mobile of simulation LTE-TD portable terminal on the output frequency of described LTE-TD base station simulator;
The regulating frequency parameter remains in the critical field bit error rate of LTE-TD portable terminal, measures the EVM of this moment.
8. method as claimed in claim 7 is characterized in that,
The described frequency values that superposes on the output frequency of LTE-TD base station simulator is to realize by the frequency sweep cycle and the frequency sweep amplitude of regulating Doppler channel simulator Doppler frequency displacement in the described test macro.
9. method as claimed in claim 7 is characterized in that, described regulating frequency parameter remains in the critical field bit error rate of LTE-TD portable terminal and is meant:
Keep Doppler channel simulator Doppler frequency displacement constant, the power output of regulating the LTE-TD base station simulator;
Perhaps, keep the power output of LTE-TD base station simulator constant, regulate the frequency displacement of Doppler channel simulator.
10. method as claimed in claim 9 is characterized in that,
The frequency displacement of described adjusting Doppler channel simulator is meant: regulate the sweep amplitude of Doppler channel simulator Doppler frequency displacement, keep the scan period constant.
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| CN200910132989A CN101854654A (en) | 2009-04-01 | 2009-04-01 | EVM (Error Vector Magnitude) test system and method of fast moving LTE (Long Term Evolution)-TD mobile terminal |
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| CN200910132989A CN101854654A (en) | 2009-04-01 | 2009-04-01 | EVM (Error Vector Magnitude) test system and method of fast moving LTE (Long Term Evolution)-TD mobile terminal |
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| CN102739328A (en) * | 2012-06-18 | 2012-10-17 | 航天恒星科技有限公司 | Error vector magnitude measurement device and method for satellite mobile communication terminal |
| CN102821406A (en) * | 2011-06-10 | 2012-12-12 | 上海华为技术有限公司 | Test method and device used during high-speed movement of user equipment |
| CN103633997A (en) * | 2013-11-18 | 2014-03-12 | 中国电子科技集团公司第四十一研究所 | Synchronizing and local oscillating device in TD-LTE-A (time-division long term evolution advanced) integrated tester |
| CN108966266A (en) * | 2018-06-12 | 2018-12-07 | Oppo广东移动通信有限公司 | Communication connecting method, device, electronic device and computer-readable medium |
| CN113133005A (en) * | 2019-12-31 | 2021-07-16 | 中国移动通信集团终端有限公司 | Method, device, system, equipment and storage medium for testing wireless communication performance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102821406A (en) * | 2011-06-10 | 2012-12-12 | 上海华为技术有限公司 | Test method and device used during high-speed movement of user equipment |
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| CN108966266A (en) * | 2018-06-12 | 2018-12-07 | Oppo广东移动通信有限公司 | Communication connecting method, device, electronic device and computer-readable medium |
| CN108966266B (en) * | 2018-06-12 | 2021-11-16 | Oppo广东移动通信有限公司 | Communication connection method, device, electronic device and computer readable medium |
| CN113133005A (en) * | 2019-12-31 | 2021-07-16 | 中国移动通信集团终端有限公司 | Method, device, system, equipment and storage medium for testing wireless communication performance |
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Application publication date: 20101006 |