CN102546040A - Method and system for testing channel delay difference - Google Patents
Method and system for testing channel delay difference Download PDFInfo
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- CN102546040A CN102546040A CN2010106010117A CN201010601011A CN102546040A CN 102546040 A CN102546040 A CN 102546040A CN 2010106010117 A CN2010106010117 A CN 2010106010117A CN 201010601011 A CN201010601011 A CN 201010601011A CN 102546040 A CN102546040 A CN 102546040A
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Abstract
The invention relates to a method and system for testing a channel delay difference and mainly achieves the aim of measuring the channel delay difference of a terminal with variable bandwidth. The method comprises the following steps of: a, sending a frequency-modulated signal with a carrier frequency of fc and a modulation frequency of fe to the terminal to be tested; b, notifying the terminal to be tested a center frequency point fc of a receiving signal and a bandwidth Bi to be measured in a variable bandwidth range; c, carrying out receiving at the terminal to be tested and measuring a phase of the receiving signal; and d, calculating a phase difference according to a reference phase under a selected bandwidth in the variable bandwidth range and the phase and calculating the channel delay difference according to the phase difference, wherein the frame length of a communication system which the terminal to be tested is based on is positive integer times of the period of the frequency-modulated signal and the period of the frequency-modulated signal is greater than the maximum channel delay inside the terminal to be tested.
Description
Technical field
The present invention relates to a kind of method of TCH test channel delay inequality, be applied to the system of LTE system and the follow-up various bandwidth varyings that possibly occur.
Background technology
Because factors such as signal processor, communication media exist channel time delay usually in the communication system.The channel time delay that will discuss below is meant the device time delay that receiving terminal is inner, and is as shown in Figure 1.Specifically, after antenna 10 receives signal, handle, convert the time delay that is produced in this process of digital signal into through radio frequency chip 12.Here the time delay maximum that produces by low pass filter.And,,, cause having bigger difference through the time delay of this low pass filter owing to the difference that is provided with of low pass filter for the signal of different bandwidth.
Channel time delay has confidential relation with system bandwidth, and communication systems such as communication system before such as GSM, TD-SCDMA, WCDMA all are the systems of equiband, so channel time delay just can not change as long as measure at the beginning again.And Long Term Evolution (LTE) system comprises time division duplex (TDD) system and FDD (FDD) system, is the communication system of adaptive-bandwidth, and its bandwidth does not wait from 1.4MHz to 20MHz.Channel time delay corresponding under each bandwidth also exists bigger difference, if still use unified channel time delay to deal with various bandwidth, can be because receive deviation regularly, thus influence the quality of reception, even can cause receiving decoding error.
In addition, existing channel time delay method of testing is to carry out through the method for using oscilloscope tolerance.The shortcoming that this method exists is, needs people's participation, can't realize automatic test, and certainty of measurement is not high, and error is big.
Summary of the invention
An object of the present invention is to provide a kind of method and system of TCH test channel delay inequality, to solve one or more problems that prior art exists.
Based on above-mentioned purpose, one aspect of the present invention proposes a kind of method of TCH test channel time delay, and this method may further comprise the steps:
A) sending carrier frequency to this terminal to be measured is f
c, and modulating frequency is f
eFM signal;
B) notify the center frequency point f that receives signal to this terminal to be measured
cWith the bandwidth B to be measured in the bandwidth varying scope
i
C) receive at this terminal to be measured, measure the phase place phase place
that receives signal
D) calculate phase difference according to a fixed phase
and this phase place
under the selected bandwidth of one in this bandwidth varying scope, and poor according to this phase difference calculating channel time delay;
Wherein this terminal to be measured based on the frame length of communication system be this FM signal cycle positive integer doubly, and this FM signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, at step c) or d) also can comprise afterwards:
E) determine whether to have traveled through the bandwidth to be measured in this bandwidth varying scope;
F) if do not traveled through bandwidth to be measured, change bandwidth B to be measured
i, and return this step b) and continue test.
In one embodiment of this invention, before step a), also comprise: receive center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.At this, according to this terminal to be measured based on being provided with of communication system types calculate this frequency modulating signal.
In one embodiment of this invention, said method is between a main frame, can send instrument and this terminal to be measured of FM signal, to automatically perform, wherein: in step a), utilize this instrument of this host notification to send this FM signal; In step b), utilize this main frame to notify this center frequency point f to this terminal to be measured
cWith this bandwidth B to be measured
i
In one embodiment of this invention, this step d) can be carried out at this terminal to be measured, and this terminal storage channel time delay to be measured is poor.
In one embodiment of this invention, this step d) is to carry out in host side, and after step d), also comprises: notify this terminal to be measured from this main frame with the channel time delay difference under the bandwidth to be measured; And it is poor at this terminal storage channel time delay to be measured.
In one embodiment of this invention, this terminal to be measured based on communication system comprise the LTE system.
The present invention proposes a kind of system of TCH test channel delay inequality in addition, and in order to test the inner passage delay inequality at a terminal to be measured, this system comprises instrument and main frame.Instrument is in order to send a FM signal.Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
eFM signal, and the notice this terminal to be measured based on center frequency point f
cWith the bandwidth B to be measured in the bandwidth varying scope
iReceive signal, then according to the fixed phase under the selected bandwidth of one in this bandwidth varying scope
The phase place of the reception signal that returns with this terminal to be measured
Calculate phase difference, and poor according to this phase difference calculating channel time delay.Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, this main frame also provides an operation interface, is used for receiving center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
In one embodiment of this invention, this main frame is used to also determine whether the bandwidth to be measured in the bandwidth varying scope that traveled through that if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
In one embodiment of this invention, this main frame also is used for this terminal to be measured of the notice of the channel time delay difference under each bandwidth to be measured.
The present invention also proposes the system of another kind of TCH test channel delay inequality, and in order to test the inner passage delay inequality at a terminal to be measured, this system comprises instrument and main frame.This instrument is in order to send a FM signal.Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
eFM signal, and the notice this terminal to be measured based on center frequency point f
cWith the bandwidth B to be measured in the bandwidth varying scope
iReceive signal.Wherein, Receive at this terminal to be measured; Measure phase place
and this terminal to be measured of receiving signal and calculate phase difference according to a fixed phase
and this phase place
under the selected bandwidth of one in this bandwidth varying scope, poor according to this phase difference calculating channel time delay then.Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, this main frame also provides an operation interface, is used for receiving center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
In one embodiment of this invention, this main frame is used to also determine whether the bandwidth to be measured in the bandwidth varying scope that traveled through that if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
In one embodiment of this invention, this terminal to be measured based on communication system comprise the LTE system.
The present invention is owing to adopt the method and system of above-mentioned TCH test channel delay inequality; FM signal through CF is set is as measured signal; And obtain delay inequality according to phase difference, can automation carry out and measure, and it is poor to measure the channel time delay of different bandwidth easily.
Description of drawings
For let above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, elaborate below in conjunction with the accompanying drawing specific embodiments of the invention, wherein:
Fig. 1 illustrates the inner channel time delay sketch map of receiving terminal.
Fig. 2 illustrates the test macro of the channel time delay difference of one embodiment of the invention.
Fig. 3 illustrates the channel time delay sketch map under the different bandwidth.
Fig. 4 illustrates the method for testing flow chart of first embodiment of the invention.
Fig. 5 illustrates the method for testing flow chart of second embodiment of the invention.
Fig. 6 illustrates variant embodiment illustrated in fig. 5.
Embodiment
Fig. 2 illustrates the test macro of channel time delay.In Fig. 2, terminal 100 is for waiting for the object of TCH test channel time delay, and in an embodiment of the present invention, terminal 100 can be mobile phone or has the portable mobile terminal of similar communication function.Terminal 100 can be based on the LTE system, and when based on the LTE system, the terminal has variable bandwidth.
The inner time delay at terminal 100 can be with reference to channel time delay sketch map shown in Figure 1.At this, instrumentation 200 carries out the channel time delay test with 300 pairs of terminals of main frame 100.
At intervals, terminal 100 is from instrument 200 acceptance test signals between instrument 200 and the terminal 100.
In the practical application example, main frame 300 is configurable to be personal computer, for example desktop computer or notebook, operation test program on it.Test program provides operation interface to the tester, receives bandwidth for you to choose, starts test, and presents test result.
In one embodiment, between main frame 300 and the terminal 100, and can connect through wired mode between main frame 300 and the instrument 200.
During test, instrument 200 can adopt like above-mentioned tone signal, is fixed on center frequency point f
cSend modulating frequency f
eBe sine wave, be modulated to the frequency f after the base band
eConfirm according to the frame length of system and the channel time delay of maximum possible.f
eDefinite method following:
1. at first with the basic timing as system of the frame length of system, requirement can comprise an integer tone signal, promptly the frame length of system be necessary for sine wave period T positive integer doubly, T=1/f
e
2. the channel time delay τ of maximum possible must be less than the cycle T of sine wave;
3.λ/T＝c。
Wherein, c is the light velocity.
For example, for the LTE system, frame length is 1ms, then f
eThe positive integer that is necessary for 100KHz doubly so just can satisfy condition 1.
In addition, the largest passages time delay is general relevant with bandwidth, and bandwidth is more little, and channel time delay is big more.For the LTE system, the largest passages time delay produces under lower band 1.4MHz, and its value is roughly the magnitude of 2～3us, so, in order to satisfy condition 2, so must make f
eValue less than 500KHz.
At this, for the LTE system with variable bandwidth, terminal 100 receives TCH test channel time delay under the bandwidth at 1.4MHz to the difference between the 20MHz.Fig. 3 illustrates several different channel time delay sketch mapes that receive under the bandwidth.With reference to shown in Figure 3, under the 20MHz bandwidth, channel time delay is τ 1; Under the 10MHz bandwidth, channel time delay is τ 2; Under the 5MHz bandwidth, channel time delay is τ 3, by that analogy.
Test program is through the phase place under the record different bandwidth, through calculating the channel time delay that just can obtain different bandwidth.
What deserves to be mentioned is that the introducing of considering channel time delay very major part is because the work of low pass filter causes, so if bandwidth is big more, so corresponding low pass filter parameter configuration will be simple more, corresponding channel time delay is also just short more.Based on this prerequisite; Can receive the phase place
that records with system's maximum bandwidth is benchmark, can obtain corresponding phase difference
in conjunction with the phase place that records under other bandwidth
Again because the term restriction of instrument signal; Sinusoidal wave wavelength is less than the channel time delay of maximum possible; So phase difference
must be between 0～2 π, the computing formula of channel time delay difference Δ τ is following:
Certainly; This is a kind of preferable example; In fact; Can in the bandwidth varying scope, select arbitrary bandwidth, with the phase place under this bandwidth as a reference phase place
obtain the channel time delay difference Δ τ under all the other each bandwidth to be measured.
According to above process, summarize the method for testing basic procedure of one embodiment of the invention.This embodiment will utilize test macro shown in Figure 2 to describe, but be appreciated that the embodiment of the invention method of testing execution and do not rely on specific test macro.As for example, an integrated special test system that sends FM signal function and test process controlled function can be used to replace the above-mentioned particular system that comprises instrument and main frame to carry out method of testing.
Fig. 4 illustrates the method for testing flow process of first embodiment of the invention.This embodiment has the terminal of bandwidth varying in order to test.Before test, the operation interface of main frame 300 is carried out the parameter setting, the type of system (LTE etc.) for example, center frequency point f
c, bandwidth varying scope B etc.According to the type of system, main frame 300 can be confirmed the frequency f of FM signal
eWith reference to shown in Figure 4, the step of present embodiment is following:
Step S11, it is f that main frame 300 notice instrument 200 are sent carrier frequency
c, modulating frequency is f
eFM signal.
Step S12, main frame 300 to terminal 100 to be measured inform receive signal based on center frequency point f
cWith bandwidth B to be measured
i
In this bandwidth B
iBe the bandwidth in the bandwidth varying scope B.For example, when bandwidth varying scope B is 1.4MHz to 20MHz, bandwidth B
iCan be the arbitrary value in this scope.
Step S13; Terminal 100 to be measured is carried out incident and is received, and measures the phase place
that receives signal
Step S14, main frame 300 judge whether that all bandwidth to be measured all travel through completion, if enter into step S16, otherwise jump to step S15.
Step S15, main frame 300 is revised bandwidth B
i, repeating step S12 all travels through completion until all bandwidth to be measured;
At this, all bandwidth B to be measured in the bandwidth varying scope B inherence have been obtained
iPhase place, comprise the fixed phase under the maximum bandwidth
After traversal is accomplished, the end-of-job of main frame 300, the notice of not redispatching is given terminal 100 to be measured.
Of preamble, alternatively, also can select the phase place phase place as a reference under other bandwidth beyond the maximum bandwidth.
Step S16, terminal 100 to be measured utilizes each bandwidth B to be measured earlier
iUnder phase place
And fixed phase
Calculate each phase difference according to formula 2
And according to formula 3 each channel time delay difference Δ of acquisition τ.
Step S17, terminal 100 to be measured writes result of calculation the memory cell of terminal inner.
In the present embodiment, though described the method for testing flow process with sequential system, the method for being appreciated that can have other execution sequences.Step S14 in that main frame 300 is carried out can perhaps carry out in the step 17 in the step 16 that carry out at terminal 300 to be measured, and perhaps more carry out evening.
Fig. 5 illustrates the method for testing flow process of second embodiment of the invention.This embodiment has the terminal of bandwidth varying in order to test.Different with last embodiment is that the step of compute channel delay inequality is placed in the main frame and carries out.Before test, the operation interface of main frame 300 is carried out the parameter setting, the type of system (LTE etc.) for example, center frequency point f
c, bandwidth varying scope B etc.According to the type of system, main frame 300 can be confirmed the frequency f of FM signal
eWith reference to shown in Figure 5, the step of present embodiment is following:
Step S21, it is f that main frame 300 notice instrument 200 are sent carrier frequency
c, modulating frequency is f
eFM signal;
Step S22, main frame 300 inform the center frequency point f that receives signal to terminal 100 to be measured
cWith bandwidth B to be measured
i
In this bandwidth B
iBe the bandwidth in the bandwidth varying scope B.For example, when bandwidth varying scope B is 1.4MHz to 20MHz, bandwidth B
iCan be the arbitrary value in this scope;
Step S23; Terminal 100 to be measured is carried out incident and is received, and measures the phase place
of reception signal and returns phase place
to main frame 300
At this, initial phase can be the waveform starting point of modulation signal, does not have channel time delay at this point;
Step S24, main frame 300 judge whether that all bandwidth to be measured all travel through completion, if enter into step S26, otherwise jump to step S25.
Step S25, main frame 300 is revised bandwidth B to be measured
i, repeating step S12 all travels through completion until all bandwidth to be measured;
At this, all bandwidth B to be measured in the bandwidth varying scope B inherence have been obtained
iPhase place, comprise the fixed phase under the maximum bandwidth
Step S26, main frame 300 utilize phase place
and fixed phase
to calculate phase difference
and obtain channel time delay difference Δ τ according to formula 3 according to formula 2 earlier;
Of preamble; Alternatively, also can select phase place phase place
as a reference under other bandwidth beyond the maximum bandwidth
Step S27, main frame 300 is notified terminal 100 to be measured with the channel time delay difference under each bandwidth to be measured of bandwidth varying scope B;
Step S28, terminal 100 to be measured writes this result the memory cell of terminal inner.
In the present embodiment, though described the method for testing flow process with sequential system, the method for being appreciated that can have other execution sequences.In variant shown in Figure 6; If obtained fixed phase
at main frame 300 after step S23; Execution in step S24 ' calculates the channel time delay difference Δ τ under the current bandwidth earlier.
The method of a kind of TCH test channel delay inequality that the above embodiment of the present invention proposed is compared with existing method of testing, has the following advantages:
1, adopts simple transmitting-receiving principle, reach precision of test result and reliability;
2, different bandwidth is tested respectively, and there is certain independence each other in each test;
3,, merge test result and be automatically converted to delay inequality to the test result of different bandwidth;
4, realize simply can in batch process, testing automatically.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (22)
1. the method for a TCH test channel delay inequality, in order to test the inner passage delay inequality at a terminal to be measured, this method may further comprise the steps:
A) sending carrier frequency to this terminal to be measured is f
c, and modulating frequency is f
eFM signal;
B) notify the center frequency point f that receives signal to this terminal to be measured
cWith the bandwidth B to be measured in the bandwidth varying scope
i
C) receive at this terminal to be measured, measure the phase place
that receives signal
D) calculate phase difference according to a fixed phase
and this phase place
under the selected bandwidth of one in this bandwidth varying scope, and poor according to this phase difference calculating channel time delay;
Wherein this terminal to be measured based on the frame length of communication system be this FM signal cycle positive integer doubly, and this FM signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
2. the method for claim 1 is characterized in that, after step c), also comprises:
E) determine whether to have traveled through the bandwidth to be measured in this bandwidth varying scope;
F) if do not traveled through bandwidth to be measured, change bandwidth B to be measured
i, and return this step b) and continue test.
3. the method for claim 1 is characterized in that, after step d), also comprises:
E) determine whether to have traveled through the bandwidth to be measured in this bandwidth varying scope;
F) if do not traveled through bandwidth to be measured, change bandwidth B to be measured
i, and return this step b) and continue test.
4. the method for claim 1 is characterized in that, before step a), also comprises: receive center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
5. method as claimed in claim 3 is characterized in that, according to this terminal to be measured based on being provided with of communication system types calculate this frequency modulating signal.
6. the method for claim 1 is characterized in that, be between a main frame, can send instrument and this terminal to be measured of FM signal, to automatically perform, wherein:
In step a), utilize this instrument of this host notification to send this FM signal;
In step b), utilize this main frame to notify this center frequency point f to this terminal to be measured
cWith this bandwidth B to be measured
i
7. method as claimed in claim 6 is characterized in that, after step c), also comprises:
E) this main frame determines whether to have traveled through the bandwidth to be measured in this bandwidth varying scope;
F) if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and return this step b) and continue test.
8. method as claimed in claim 6 is characterized in that, after step d), also comprises:
E) this main frame determines whether to have traveled through the bandwidth to be measured in this bandwidth varying scope;
F) if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and return this step b) and continue test.
9. like claim 7 or 8 described methods, it is characterized in that this step d) is to carry out at this terminal to be measured, and this terminal storage channel time delay to be measured is poor.
10. like claim 7 or 8 described methods, it is characterized in that this step d) is to carry out in host side, and after step d), also comprises:
Notify this terminal to be measured from this main frame with the channel time delay difference under the bandwidth to be measured; And
Poor at this terminal storage channel time delay to be measured.
11. method as claimed in claim 6 is characterized in that, before step a), also comprises: this main frame receives center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
12. method as claimed in claim 11 is characterized in that, this main frame according to this terminal to be measured based on communication system types this frequency modulating signal of calculating is set.
13. the method for claim 1 is characterized in that, this terminal to be measured based on communication system comprise the LTE system.
14. the system of a TCH test channel delay inequality in order to test the inner passage delay inequality at a terminal to be measured, comprising:
Instrument is in order to send a FM signal;
Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
eFM signal, and the notice this terminal to be measured based on center frequency point f
cWith the bandwidth B to be measured in the bandwidth varying scope
iReceive signal, then according to the fixed phase under the selected bandwidth of one in this bandwidth varying scope
The phase place of the reception signal that returns with this terminal to be measured
Calculate phase difference, and poor according to this phase difference calculating channel time delay,
Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
15. system as claimed in claim 14 is characterized in that, this main frame also provides an operation interface, is used for receiving center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
16. system as claimed in claim 14 is characterized in that, this main frame is used to also determine whether the bandwidth to be measured in the bandwidth varying scope that traveled through that if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
17., it is characterized in that this main frame also is used for this terminal to be measured of the notice of the channel time delay difference under each bandwidth to be measured like claim 14 or 16 described systems.
18. system as claimed in claim 14 is characterized in that, this terminal to be measured based on communication system comprise the LTE system.
19. the system of a TCH test channel delay inequality in order to test the inner passage delay inequality at a terminal to be measured, comprising:
Instrument is in order to send a FM signal;
Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
eFM signal, and the notice this terminal to be measured based on center frequency point f
cWith the bandwidth B to be measured in the bandwidth varying scope
iReceive signal;
Wherein, Receive at this terminal to be measured; Measure phase place
and this terminal to be measured of receiving signal and calculate phase difference according to a fixed phase
and this phase place
under the selected bandwidth of one in this bandwidth varying scope, poor according to this phase difference calculating channel time delay then;
Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle is greater than the largest passages time delay of this terminal inner to be measured.
20. system as claimed in claim 19 is characterized in that, this main frame also provides an operation interface, is used for receiving center frequency point f
c, the bandwidth one or more to be measured in this bandwidth varying scope and this terminal to be measured based on the setting of communication system types.
21. system as claimed in claim 19 is characterized in that, this main frame is used to also determine whether the bandwidth to be measured in the bandwidth varying scope that traveled through that if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
22. system as claimed in claim 19 is characterized in that, this terminal to be measured based on communication system comprise the LTE system.
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| CN103916199A (en) * | 2014-03-18 | 2014-07-09 | 中国科学院国家天文台 | Device and method for time delay and phase adjustment of antenna signal |
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| CN107222271B (en) * | 2017-05-15 | 2020-05-15 | 中国科学院国家授时中心 | Long-wave ground wave time delay prediction method based on double-frequency/multi-frequency time delay difference measurement |
| CN111064532A (en) * | 2019-12-23 | 2020-04-24 | 北京航天益森风洞工程技术有限公司 | Transmission delay test method and system for unmanned platform remote control and remote measurement data system |
| CN111064532B (en) * | 2019-12-23 | 2022-08-12 | 北京航天益森风洞工程技术有限公司 | Transmission delay test method and system for unmanned platform remote control and remote measurement data system |
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