CN101355392A - Method and system for measuring time delay of user terminal receiving channel - Google Patents
Method and system for measuring time delay of user terminal receiving channel Download PDFInfo
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Abstract
The invention provides a method for measuring time delay of a UE receiving channel and a measuring system. The measuring method comprises the following steps that: A. the radio frequency signal sent by a base station is divided into two radio frequency signals; B. the lower conversion frequency of one of the two radio frequency signals is the baseband signal; C. the UE receives another radio frequency signal of the two radio frequency signals by the receiving channel, and acquires the clock signal of the system; D. according to the clock signal of the system and the baseband signal, the time delay of the UE receiving channel is acquired. According to the measuring method and the measuring system of the invention, the time delay of the UE receiving channel can be accurately measured, which reliably guarantees the synchronization between a repeater and the base station.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of user terminal (UE, UserEquipment) receive path Delay Measurement and measuring system.
Background technology
In mobile communications network, the repeater is fine the replenishing that the network coverage is carried out in the base station, can enlarge the coverage of base station and be used for coverage hole.In time division duplex (TDD, Time Division Duplex) system, the repeater is for guaranteeing the break-even amplification of uplink and downlink signals, must with the base station strict synchronism.As shown in Figure 1, a kind of method that solves repeater and base station synchronization at present is the UE module of integrated this mobile communication system in the repeater.
System is an example with Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization CodeDivision Multiple Access), Figure 2 shows that the schematic diagram of clock time delay in the TD-SCDMA system.In this system, the cycle that the repeater generally uses UE (as wireless module) to obtain its present position is the clock signal of system of 5 milliseconds (ms), and this 5ms clock signal (signal 2 among the figure two) has comprised certain path propagation delay time T with respect to the 5ms clock signal (signal 1 among the figure two) of base station
LThe 5ms clock signal of UE inside (signal 3 among the figure two) is a benchmark with the digital baseband time then, and it is compared with the base station down radiofrequency signal that the UE antenna opening receives, and also has certain time delay, i.e. the simulation receive path time delay T of UE
RXTherefore, as shown in Figure 2, the 5ms clock signal of UE digital baseband has T than the 5ms clock of base station side
L+ T
RXTime delay.And the repeater actual needs is the 5ms clock signal (i.e. the signal 2 of figure two) of its base station down radiofrequency signal correspondence that receives, and the 5ms clock signal of wireless module digital baseband output need be deducted self receive path time delay T for this reason
RX, the system 5ms clock signal that reflects the base station down radiofrequency signal that the present position, repeater receives that could be correct.
For the group delay of receiver and transmitter radio frequency module, can adopt network analyzer to measure usually.But the limitation of this measurement is that input, the output signal frequency of requirement receiver and transmitter radio frequency module all is identical, because the frequency of the uplink and downlink signals of existing mobile communications system is all inequality, therefore can't measure separately receive path by network analyzer.
Because the time delay of the receive path of UE can't adopt network analyzer directly to measure, the design engineer often can only estimate the time delay of UE receive path according to the group delay index that provides in the service manual that receives each device in the link under many circumstances.Figure 3 shows that the device that is comprised in the receiving-transmitting chain of UE, as shown in Figure 3, in whole reception link, to contributive receiving filter RxFilter, rf receiver unit RF_RXU, the analog to digital converter ADC etc. of being mainly of time delay.Obviously, the method of this estimation need be understood the group delay index of each device, and the time delay that the group delay index that service manual provided produces might not be each device real work the time also can only adopt the way of compromise when concrete estimation, so its estimation result is very rough.And this evaluation method more is difficult to accomplish reasonable estimation for the caused time delay of the track between each device (lead).
Summary of the invention
Technical problem to be solved by this invention provides a kind of UE receive path Delay Measurement and measuring system, is used for accurately measuring the time delay of the UE of TDD system receive path.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
A kind of user terminal UE receive path Delay Measurement is applied to comprise step in the TDD system:
A, the radiofrequency signal that the base station is sent is divided into the two-way radiofrequency signal;
B down-converts to baseband signal with road radiofrequency signal in the described two-way radiofrequency signal;
C, UE receives another road radiofrequency signal in the described two-way radiofrequency signal by its receive path, and therefrom obtains clock signal of system;
D obtains UE receive path time delay according to described clock signal of system and baseband signal.
Method of measurement of the present invention, wherein, in the described steps A, the radiofrequency signal that send described base station is the TDD radiofrequency signal that send the base station, or the TDD radiofrequency signal sent of signal source anolog base station.
Method of measurement of the present invention, wherein, among the described step C, described clock signal of system is to be 5 milliseconds of clock signal of system in the cycle.
Method of measurement of the present invention, wherein, described step D comprises:
Observe described clock signal of system and baseband signal simultaneously by oscilloscope, the delay inequality between measuring system clock signal waveform and the baseband signal waveform corresponding with this clock signal of system obtains described UE receive path time delay.
Method of measurement of the present invention, wherein, described step B specifically comprises:
Frequency mixer receives the local oscillation signal that road radiofrequency signal in the described two-way radiofrequency signal and local source provide, and according to described local oscillation signal described one tunnel radiofrequency signal is down-converted to baseband signal.
Method of measurement of the present invention wherein, also comprises after the described step D:
E calculates the described UE receive path time delay sum that obtains among the delay parameter of described frequency mixer and the step D, obtains actual UE receive path time delay.
Method of measurement of the present invention, wherein, in the described step e, the delay parameter of described frequency mixer is to utilize network analyzer to measure to obtain, and specifically comprises:
The frequency that the outbound port of network analyzer sends is that first signal of first frequency is sent to first frequency mixer;
The frequency that first frequency mixer provides according to local source is the secondary signal of second frequency, described first signal frequency conversion that receives is the 3rd signal of the 3rd frequency after, be sent to second frequency mixer;
Second frequency mixer is according to described secondary signal, described the 3rd signal frequency conversion that receives is the 4th signal of first frequency after, be sent to the inbound port of network analyzer;
Network analyzer is measured the time delay of described first signal and the 4th signal, and the gained time delay value is the delay parameter twice of described frequency mixer.
A kind of measuring system of UE receive path time delay comprises:
The radiofrequency signal shunt module is used to receive the radiofrequency signal that external base station is sent, and this signal is divided into the two-way radiofrequency signal, is sent to UE to be measured and baseband signal acquisition module respectively;
The baseband signal acquisition module is used to receive the road radiofrequency signal that described radiofrequency signal shunt module is told, and this radiofrequency signal is down-converted to baseband signal;
The time delay acquisition module, be used for the baseband signal that the clock signal of system that obtains according to UE to be measured and described baseband signal acquisition module obtain, obtain the receive path time delay of UE to be measured, described clock signal of system is to obtain another road radiofrequency signal of telling of described radiofrequency signal shunt module that UE to be measured receives from its receive path.
Measuring system of the present invention, wherein, described radiofrequency signal shunt module is a power splitter.
Measuring system of the present invention, wherein, described baseband signal acquisition module comprises: local source and frequency mixer, wherein,
Described local source is used to produce local oscillation signal and sends to described frequency mixer;
Described frequency mixer is used for according to described local oscillation signal, and the road radiofrequency signal that the described radiofrequency signal shunt module that receives is told down-converts to baseband signal.
Measuring system of the present invention, wherein, described time delay acquisition module comprises an oscilloscope, is used to receive and shows the described baseband signal that clock signal of system that UE to be measured obtains and frequency mixer obtain.
From the above as can be seen, UE receive path Delay Measurement provided by the invention and measuring system, by oscilloscope observation system clock signal and baseband signal, obtain UE receive path time delay according to the time delay difference between the signal waveform, thereby realized accurate measurement, for providing reliable assurance synchronously between repeater and the base station to UE receive path time delay.
Description of drawings
Fig. 1 sets up synchronous schematic diagram for the repeater by UE module and base station;
Fig. 2 is the schematic diagram of clock time delay in the TD-SCDMA system;
Fig. 3 is the structural representation of the receiving-transmitting chain of UE;
Fig. 4 is the schematic diagram of the measuring system of the described UE receive path of embodiment of the invention time delay;
Fig. 5 is the flow chart of the described UE receive path of embodiment of the invention Delay Measurement;
Fig. 6 is by the observed oscillogram of oscilloscope in the embodiment of the invention;
The connection diagram that Fig. 7 delays time when measuring frequency mixer by network analyzer in the embodiment of the invention.
Embodiment
The invention provides a kind of UE receive path Delay Measurement and measuring system, be applied to the measurement of UE receive path time delay in the TDD system.The present invention can accurately measure the time delay of UE receive path, below is example with the TD-SCDMA system, by specific embodiment the present invention is elaborated in conjunction with the accompanying drawings.
As shown in Figure 4, the measuring system of the described UE receive path of embodiment of the invention time delay comprises: radiofrequency signal shunt module 41, and baseband signal acquisition module and time delay acquisition module, wherein,
Described radiofrequency signal shunt module 41 is used to receive the radiofrequency signal that external base station is sent, and this signal is divided into the two-way radiofrequency signal, is sent to UE to be measured and baseband signal acquisition module 42 respectively;
Described baseband signal acquisition module 42 is used to receive the road radiofrequency signal that described radiofrequency signal shunt module 41 is told, and this radiofrequency signal is down-converted to baseband signal;
Described time delay acquisition module 43, be used for the baseband signal that the clock signal of system that obtains according to UE to be measured and described baseband signal acquisition module 42 obtain, obtain the receive path time delay of UE to be measured, described clock signal of system is to obtain another road radiofrequency signal of telling of described radiofrequency signal shunt module that UE to be measured receives from its receive path.
What here, described radiofrequency signal shunt module 41 was concrete can be power splitter.
Here, described baseband signal acquisition module 42 concrete can comprising: local source and frequency mixer, wherein, described local source is used to produce local oscillation signal and sends to described frequency mixer; Described frequency mixer is used for according to described local oscillation signal, and the road radiofrequency signal that the described radiofrequency signal shunt module 41 that receives is told down-converts to baseband signal.
Here, described time delay acquisition module 43 can comprise an oscilloscope, is used to receive and shows the described baseband signal that clock signal of system that UE to be measured obtains and frequency mixer obtain.Thereby the tester can observe the receive path time delay of UE to be measured by the signal waveform on the oscilloscope.
In Fig. 4, can further include the UE test board, this UE test board is connected with UE to be measured, by the UE test board clock signal of system that UE obtains is input to oscilloscope.
As shown in Figure 5, the described UE receive path of embodiment of the invention Delay Measurement may further comprise the steps:
Here, described radiofrequency signal can be the TDD radiofrequency signal that send the base station, or the TDD radiofrequency signal sent of signal source anolog base station; The time delay of the two-way radiofrequency signal that obtains along separate routes is identical.
Here, UE receives TDD radiofrequency signal from the base station by its receive path, and the TDD radiofrequency signal that receives is carried out processing such as demodulation, obtains clock signal of system wherein, as cycle of TD-SCDMA system be 5 milliseconds of clock signal of system.
Here, another road TDD radiofrequency signal is down-converted to baseband signal, to guarantee in step 53, observing (the TDD radio frequency signal frequency is too high, can't observe with oscilloscope usually) with oscilloscope by frequency mixer.Certainly, also can described another road TDD radiofrequency signal be down-converted to baseband signal here by other demodulation methods.
Here, concrete can observe described clock signal of system and baseband signal simultaneously by oscillographic two passages, as shown in Figure 6, is the clock signal of system waveform by the observed signal 1 of oscilloscope, and signal 2 is the signal waveform of frequency mixer output; Then, the delay inequality between measuring system clock signal waveform and the baseband signal waveform corresponding with this clock signal of system obtains described UE receive path time delay T '
RX
According to above method, can obtain the time delay T ' of the receive path of UE
RX, but in said method, compare with the radiofrequency signal after the shunt through the described baseband signal that frequency mixer obtains, increased the time delay T of frequency mixer
Mixer, therefore, actual UE receive path time delay T
RXShould be the time delay T of described frequency mixer
MixerWith the described UE receive path time delay T ' that obtains in the step 53
RXSum, i.e. T
RX=T
Mixer+ T '
RXHere, the time delay T of described frequency mixer
MixerThe service manual that parameter can be consulted this frequency mixer obtains, and can also utilize network analyzer to measure and obtain, and wherein, measures T by network analyzer
MixerCan carry out according to connected mode shown in Figure 7:
Because time-delay when network analyzer is measured, require the signal frequency of its inbound port and outbound port identical, therefore in Fig. 7, utilize two frequency mixers (frequency mixer 1 and 2) and network analyzer to connect into a loop, make the signal frequency of network analyzer inbound port and outbound port identical.Described two frequency mixers, identical with the frequency mixer that uses in the above-mentioned UE receive path Delay Measurement, in other words, these two frequency mixers have with above-mentioned UE receive path Delay Measurement in the identical time delay T of frequency mixer that uses
MixerAmong Fig. 7, it is the secondary signal of second frequency that local source B produces frequency, after a power splitter is divided into two paths of signals, is sent to two frequency mixers respectively.Like this, in above-mentioned loop, the frequency that the outbound port of network analyzer sends is that first signal of first frequency is sent to frequency mixer 1; The secondary signal that frequency mixer 1 provides according to local source, first signal frequency conversion that receives is the 3rd signal of the 3rd frequency after, be sent to frequency mixer 2; The described secondary signal that frequency mixer 2 provides according to local source, described the 3rd signal frequency conversion that receives is the 4th signal of first frequency after, be sent to the inbound port of network analyzer.Utilize network analyzer that this loop time delay (time delay between first signal and the 4th signal) is measured, the gained time delay value is the time delay sum of described frequency mixer 1 and 2, i.e. 2T
MixerThereby, can obtain T
Mixer
In sum, a kind of UE receive path Delay Measurement provided by the invention and measuring system can accurately be measured UE receive path time delay, thereby repeater clock and base station clock provide reliable assurance synchronously in the TDD system in order to solve.
UE receive path Delay Measurement of the present invention and measuring system, be not limited in listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.
Claims (11)
1. a user terminal UE receive path Delay Measurement is applied to it is characterized in that in the TDD system, comprises step:
A, the radiofrequency signal that the base station is sent is divided into the two-way radiofrequency signal;
B down-converts to baseband signal with road radiofrequency signal in the described two-way radiofrequency signal;
C, UE receives another road radiofrequency signal in the described two-way radiofrequency signal by its receive path, and therefrom obtains clock signal of system;
D obtains UE receive path time delay according to described clock signal of system and baseband signal.
2. method of measurement as claimed in claim 1 is characterized in that, in the described steps A, the radiofrequency signal that send described base station is the TDD radiofrequency signal that send the base station, or the TDD radiofrequency signal sent of signal source anolog base station.
3. method of measurement as claimed in claim 1 is characterized in that, among the described step C, described clock signal of system is to be 5 milliseconds of clock signal of system in the cycle.
4. method of measurement as claimed in claim 1 is characterized in that, described step D comprises:
Observe described clock signal of system and baseband signal simultaneously by oscilloscope, the delay inequality between measuring system clock signal waveform and the baseband signal waveform corresponding with this clock signal of system obtains described UE receive path time delay.
5. method of measurement as claimed in claim 1 is characterized in that, described step B specifically comprises:
Frequency mixer receives the local oscillation signal that road radiofrequency signal in the described two-way radiofrequency signal and local source provide, and according to described local oscillation signal described one tunnel radiofrequency signal is down-converted to baseband signal.
6. method of measurement as claimed in claim 5 is characterized in that, also comprises after the described step D:
E calculates the described UE receive path time delay sum that obtains among the delay parameter of described frequency mixer and the step D, obtains actual UE receive path time delay.
7. method of measurement as claimed in claim 6 is characterized in that, in the described step e, the delay parameter of described frequency mixer is to utilize network analyzer to measure to obtain, and specifically comprises:
The frequency that the outbound port of network analyzer sends is that first signal of first frequency is sent to first frequency mixer;
The frequency that first frequency mixer provides according to local source is the secondary signal of second frequency, described first signal frequency conversion that receives is the 3rd signal of the 3rd frequency after, be sent to second frequency mixer;
Second frequency mixer is according to described secondary signal, described the 3rd signal frequency conversion that receives is the 4th signal of first frequency after, be sent to the inbound port of network analyzer;
Network analyzer is measured the time delay of described first signal and the 4th signal, and the gained time delay value is the delay parameter twice of described frequency mixer.
8. the measuring system of a UE receive path time delay is characterized in that, comprising:
The radiofrequency signal shunt module is used to receive the radiofrequency signal that external base station is sent, and this signal is divided into the two-way radiofrequency signal, is sent to UE to be measured and baseband signal acquisition module respectively;
The baseband signal acquisition module is used to receive the road radiofrequency signal that described radiofrequency signal shunt module is told, and this radiofrequency signal is down-converted to baseband signal;
The time delay acquisition module, be used for the baseband signal that the clock signal of system that obtains according to UE to be measured and described baseband signal acquisition module obtain, obtain the receive path time delay of UE to be measured, described clock signal of system is to obtain another road radiofrequency signal of telling of described radiofrequency signal shunt module that UE to be measured receives from its receive path.
9. measuring system as claimed in claim 8 is characterized in that, described radiofrequency signal shunt module is a power splitter.
10. measuring system as claimed in claim 8 is characterized in that, described baseband signal acquisition module comprises: local source and frequency mixer, wherein,
Described local source is used to produce local oscillation signal and sends to described frequency mixer;
Described frequency mixer is used for according to described local oscillation signal, and the road radiofrequency signal that the described radiofrequency signal shunt module that receives is told down-converts to baseband signal.
11. measuring system as claimed in claim 8 is characterized in that, described time delay acquisition module comprises an oscilloscope, is used to receive and shows the described baseband signal that clock signal of system that UE to be measured obtains and frequency mixer obtain.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325058A (en) * | 2011-09-06 | 2012-01-18 | 北京空间飞行器总体设计部 | Frequency change system group delay test method |
| CN102447515A (en) * | 2011-09-26 | 2012-05-09 | 中国空间技术研究院 | System and method for testing satellite-ground time delay and onboard time errors |
| CN106654485A (en) * | 2016-11-22 | 2017-05-10 | 中国电子科技集团公司第五十五研究所 | Microwave frequency band over-sized delay method and system |
| CN109067494A (en) * | 2018-08-27 | 2018-12-21 | 电子科技大学 | A kind of UAT data-link time synchronization method and device about CPFSK Modulation Types |
| CN111929708A (en) * | 2020-06-30 | 2020-11-13 | 中国科学院国家授时中心 | Antenna and receiving channel calibration system and method for signal quality evaluation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100341375C (en) * | 2004-05-31 | 2007-10-03 | 华为技术有限公司 | Device and method for measuring time delay of cell RF transmission channel |
| CN100426684C (en) * | 2004-11-17 | 2008-10-15 | 华为技术有限公司 | 2-carrier receiving module and multiple-carrier base station receiver |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325058A (en) * | 2011-09-06 | 2012-01-18 | 北京空间飞行器总体设计部 | Frequency change system group delay test method |
| CN102325058B (en) * | 2011-09-06 | 2014-01-15 | 北京空间飞行器总体设计部 | Frequency change system group delay test method |
| CN102447515A (en) * | 2011-09-26 | 2012-05-09 | 中国空间技术研究院 | System and method for testing satellite-ground time delay and onboard time errors |
| CN102447515B (en) * | 2011-09-26 | 2014-10-08 | 中国空间技术研究院 | System and method for testing satellite-ground time delay and onboard time errors |
| CN106654485A (en) * | 2016-11-22 | 2017-05-10 | 中国电子科技集团公司第五十五研究所 | Microwave frequency band over-sized delay method and system |
| CN106654485B (en) * | 2016-11-22 | 2020-01-24 | 中国电子科技集团公司第五十五研究所 | Microwave frequency band ultra-large delay method and system |
| CN109067494A (en) * | 2018-08-27 | 2018-12-21 | 电子科技大学 | A kind of UAT data-link time synchronization method and device about CPFSK Modulation Types |
| CN109067494B (en) * | 2018-08-27 | 2019-08-13 | 电子科技大学 | A kind of UAT data-link time synchronization method and device about CPFSK Modulation Types |
| CN111929708A (en) * | 2020-06-30 | 2020-11-13 | 中国科学院国家授时中心 | Antenna and receiving channel calibration system and method for signal quality evaluation |
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