CN1848703A - TD-SCDMA terminal radio frequency consistency testing method - Google Patents
TD-SCDMA terminal radio frequency consistency testing method Download PDFInfo
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Abstract
A method for testing consistency of radio frequency at TC-SCDMA terminal includes sending out the first signal by sending end, setting radio and medium frequency attenuation ( RMFA ) at receiving end and carrying out data sampling (DS) after signal is attenuated, then making fine synchronization (FS ) calculating out power of synchronized signal to obtain emission power (EP) of sending end; sending out the second signal by sending end, removing off set RMFA at receiving end and carrying out DS on received signal, then making FS, calculating out power of synchronized signal to obtain closing power (CP) of sending end, combining obtained EP with obtained CP to obtain measurement value of power to time.
Description
Technical field
The present invention relates to TD-SCDMA mobile communication technology field, relate in particular to TD-SCDMA terminal radio frequency consistency field tests.
Background technology
Current moving communicating field, along with the requirement to wireless data service, wireless transmission rate and reduction wireless transmission cost constantly strengthens, 3G technology and application fast development.The TD-SCDMA standard of China's independent development and the progress of application thereof are one of key factors that influences China 3G process always.To the test of TD-SCDMA terminal equipment, affect the large-scale production of terminal equipment, therefore become the emphasis in the industry chain, also be weak link simultaneously.As the important content of terminal radio frequency consistency test, PVT (Power vs Time) test is being brought into play important effect at aspects such as terminal equipment research and development, production line test and radio frequency impairments location.
Regularly play important effect with the system that burst form transmits for a multi-slot.In order not influence adjacent time slot, the burst power in a particular time-slot must be strict controlled in the set masterplate, and Here it is, and PVT measures institute's test contents.Concerning WCDMA and cdma2000, this dynamic range is approximately 40dB, but the dynamic range of the power of TD-SCDMA standard formulation is comparatively strict, has reached 112dB, this dynamic range is difficult concerning common radio-frequency front-end to realize also there is not effective method of measurement at present.Therefore, how measuring the bigger variable power of dynamic range fast and accurately becomes the difficult point that PVT measures item, and efficient feasible PVT method of measurement also becomes the research focus of TD-SCDMA terminal radio frequency consistency field tests.
Summary of the invention
The object of the present invention is to provide a kind of TD-SCDMA terminal radio frequency consistency testing method.
According to the present invention, a kind of TD-SCDMA terminal radio frequency consistency testing method is provided, comprise step:
(1) sends signal in the first time of making a start;
(2) set radio frequency and intermediate frequency decay in receiving end, to after the described signal attenuation that receives of making a start, carrying out data sampling again, and the signal after the sampling is carried out fine synchronization;
The power of the signal after (3) the calculating process fine synchronization, and obtain described transmitting power of making a start;
(4) send signal in the second time of making a start;
(5) remove the radio frequency of described setting and intermediate frequency decay in described receiving end, to carrying out data sampling, and the signal after the sampling is carried out fine synchronization from the described signal that receives of making a start;
(6) calculate power through the signal after the fine synchronization, and obtain described make a start close power;
(7) making a start that make a start transmitting power and the step (6) that step (3) is obtained obtains closed the power amalgamation together, obtains power to time (PVT) measured value.
Preferably, wherein said fine synchronization step is further comprising the steps of:
(1) at the described signal of making a start and sending of the data collecting module collected of described receiving end;
(2) data of described collection are carried out filtering through root raised cosine filter;
(3) filtered data are divided into 12 groups, utilize local multiple intermediate code to slide relevant respectively with described 12 groups of data, obtain the relevant peaks maximum a road as the optimum sampling branch road, and utilize the correlation peak position, obtain multiple intermediate code in the filtered 12 times of accurate positions replied immediately in the data sequence of root raised cosine filter;
(4) symmetrical structure according to optimum sampling branch road that obtains in the step (3) and root raised cosine filter produces linear delay, calculates multiple intermediate code 12 times of accurate positions of replying immediately in the data sequence.
Preferably, the rolloff-factor of described raised cosine filter is 0.22.
Preferably, step (1) also comprises step:
According to the nominal calibration value of described data acquisition module to its acquired signal, extract begin from the nominal time slot before 80 chips, 72 chips signal of totally 1000 chips after the nominal time slot finishes, as the data of described collection.
Method of the present invention has solved the not enough defective of traditional TD-SCDMA terminal PVT indicator consilience testing algorithm dynamic range, and tests TD-SCDMA terminal PVT index under the prerequisite that does not need repeatedly to scan.
Description of drawings
Fig. 1 shows according to clock switch template of the present invention;
Fig. 2 shows physical channel signal form and the system burst structure of TD-SCDMA
Embodiment
TD-SCDMA terminal radio frequency consistency testing method of the present invention is described with reference to the accompanying drawings and in conjunction with the preferred embodiments.
Conformance test method of the present invention carries out twice processing after the terminal data that receives is sampled, and reaches the dynamic range requirement of standard code.Wherein single treatment is measured low side power at noise; Another time processing then transmits at terminal, adjusts the radio-frequency front-end decay, measures high-end power.The result who measures for twice is carried out amalgamation, obtain a variable power figure that dynamic range is bigger.And provide a pass/fail function to determine fast whether signal is within the masterplate scope on the display screen fully and consistent with agreement.
The transmission characteristic that the PVT test item can be observed transmitter in time by the selected test target of user can be observed power on specific business time-slot, UpPTS, DwPTS, single burst, the complete 10ms frame to time value.Different time slots has different power template, and the present invention is that example describes with the specific transactions time slot only.In the specific transactions time slot, the transmitting power of transmitter should satisfy emission ON/OFF time template.This template definition is that the UE transmitter cuts out from being opened to, and from be closed to the process of opening, the transmitted power level that is allowed changes the corresponding time of institute, as shown in Figure 1.If in the transmitting power of the terminal template restricted portion in the figure, then measure a pass, otherwise fail.
In the test of terminal PVT indicator consilience, terminal and test instrumentation adopt the connected mode of radio frequency cable, should at first utilize protocol simulator or base station and terminal to set up the RMC reference measure channel of 12.2kbps, dispose it and enter the loopback test pattern.In order to reach reasonable effect, terminal uses solid size to transmit, and arrives the transmitting power control of terminal maximum by anolog base station.Signals sampling should finish back 50 chips, the time range of 948 chips altogether up to this time slot since 50 chips (chip) before the starting point at a time slot (the protection interval that does not comprise this time slot).Why select 50 chips to be because can observe the power of closing of longer time like this.The thin simultaneous operation of this process need is coordinated to finish, and promptly accurately locatees launch time according to the multiple intermediate code sequence in the sampled data, and for the PVT measurement provides the precise time coordinate, the while also provides prerequisite for the amalgamation of twice deal with data.'s 0.22 root raised cosine filter with sampled data through the rolloff-factor that equates with the spreading rate bandwidth, calculate the average power of each chip again on each chip according to the result behind the wave filter, it is exactly the PVT figure of terminal in a time slot that these chip power are combined.How to finish thin simultaneous operation accurately and become one of difficult point of for this reason measuring item.Another difficult point is exactly because the dynamic range of radio-frequency front-end can not reach the 112dB that TD-SCDMA requires, therefore we carry out twice processing after sampling by the terminal data that receives, and the result that twice processing obtains is carried out the dynamic range requirement that amalgamation reaches standard code.Describe these difficult point problems below in detail.
One. fine synchronization
In the TD-SCDMA system, except that characteristic, also have the characteristics of TDMA on its access mode with DS-CDMA.Its basic physical channel characteristics is by frequency, and sign indicating number and time slot determine.Its frame structure is divided into two 5ms subframes with the radio frames of 10ms, and 7 conventional time slots and 3 special time slots are arranged in each subframe.Fig. 2 shows physical channel signal form and the system burst structure of TD-SCDMA.Physical channel under the tdd mode is with the particular time-slot emission of a burst in the radio frames of being distributed, and therefore regularly has very important significance for the TD-SCDMA system.Burst in a particular time-slot must be strict controlled in the masterplate, otherwise will cause interference to other time slots, and the purpose of PVT test is exactly whether check UE uses protection to open or close the action of its transmitting power at interval.In addition, (just not launch time) also checked outside transmitting time and guard time in this test, and whether the power of UE is closing under the power.As can be seen, the PVT measuring essence is exactly the burst masterplate that whether conformance with standard is stipulated in time that check dut terminal transmitter is launched in assigned timeslot.
According to terminal PVT indicator consilience test request, the level that dut terminal transmits must be positioned within the masterplate shown in Figure 1 the track of time, and regulation is with the intermediate code of the tested burst benchmark as the time location, promptly utilizes intermediate code to be that the sampled point one by one of tested burst is corresponding and gives a temporal coordinate.
Thin synchronous effect is exactly by transmit structure of dut terminal itself it to be accurately positioned on the time shaft.The present invention utilizes the autocorrelation performance of the intermediate code in the TD-SCDMA system burst structure to finish transmit in time location of dut terminal.It is as follows at first to define basic symbol:
Receive 12 times and reply immediately data sequence { x
1(n), 0≤n≤N-1}
Wherein N is the receiving data sequence length of storage.
The filtered reception of RRC is replied immediately data sequence { x for 12 times
2(n), 0≤n≤N-1}
Wherein N is the receiving data sequence length of storage.
Local intermediate code sequence { x
3(n), 0≤n≤M-1}
Wherein M is an intermediate code length, and value is 144 in the TD-SCDMA system.
Sampling rate R
Sample=15.38Mhz
Character rate R
Symbol=1.28Mchip/s
In system design, the front end data acquisition module has thick synchronizing capacity, can think that each sampled value of the measured signal that it is gathered is demarcated the skew with respect to intermediate code.But this time calibrating is inaccurate, and can have the skew of 0 to 10 chip.According to terminal PVT indicator consilience test request, carry out PVT when measuring, must be its demarcation correct time coordinate according to measured signal, promptly need to demarcate exactly in the time slot to be measured each sample value with respect to the skew of intermediate code.Based on this requirement, just need carry out fine synchronization to the receiving data sequence of front end data acquisition module collection.Concrete grammar is described below:
1, obtains the baseband signal sampled value of the dut terminal emission of its collection from data acquisition module.The sampled data x of assigned timeslot is provided according to its time calibrating that provides
1(n), need be during extraction according to the nominal calibration value of acquisition module to its acquired signal, extract before beginning from the nominal time slot 80 chips after the nominal time slot finishes 72 chips the signal of totally 1000 chips as the analysis data of PVT method.
2, open up new buffer memory, be used to deposit that to utilize rolloff-factor be that 0.22 root raised cosine filter (RRC) carries out the filtered data x of RRC to receiving data
2(n).
3, according to data acquisition module its sampled signal is made the uncertain region of time calibrating, can preliminary judgement from 1000 chips that data acquisition module obtains, if counting is started from scratch, intermediate code possible initial is positioned in [69,79] interval of these 1000 chips.For increased reliability, the possible interval of the initial chip of time slot is increased to [59,119].The intermediate code of 144 complete like this chips may will be contained in [59,263] between the area of coverage, extract this one piece of data from 1000 chips of data collecting module collected, be designated as sequences y (n).
y(n)＝x
2(n+59)，0≤n≤(263-59)×12＝2448
Multiple intermediate code sequence x with this locality storage
3(n) carry out related operation.Because sequences y (n) therefore is divided into 12 groups for the filtered 12 times of fast data y of RRC, every group of data are reinstated 12 bit intervals with an initial sampling, and extraction obtains to y (n), is designated as b respectively
0(n), b
1(n) ..., b
k(n), 0≤k≤11
b
k(n)＝y(k+12·n)，0≤n≤204
With 12 groups of data respectively with multiple intermediate code sequence x
3(n) related operation that slides, and get the relevant peaks maximum a road as the optimum sampling branch road, getting this branch number is L, getting this branch road relevant peaks place sequence number is O.Can obtain intermediate code in 12 times of accurate positions of replying immediately in the data sequence of the filtered reception of RRC with the correlation peak position.
O＝m
SC
L(m)＝max(SC
L(n))
SC
k(n) sequence b is asked in expression
kWith local intermediate code x
3 *The slip correlated series.
The accurate original position that intermediate code is replied immediately in the data sequence 12 times of the filtered receptions of RRC is (59+O) * 12+L.
4, the linear delay that produces of the symmetrical structure of the RRC filter of realizing by the optimum position that obtains in 3 and by finite impulse response (FIR) can calculate intermediate code and reply immediately data sequence x receiving 12 times
1(n) the accurate position in.Thereby can be to x
1(n) carry out time calibrating exactly, for the PVT measurement provides the precise time coordinate.Just from x
1(n) obtain 12 times of fast sampled datas of 948 chips in accurately.
Two. obtain high dynamic range.
We have adopted twice dynamic range requirement that method for scanning reaches standard code.Be described in detail at terminal radio frequency consistency testing method of the present invention below.
At first send signal in the first time of making a start.
Sending order, to data acquisition module rf attenuation to be set be RFAtt, and when intermediate frequency decayed to IFAtt, sampled data obtained on the time shaft sampled data of 948 chips accurately through fine synchronization.
Calculate chip power.It promptly is chip power that 12 sampling complex datas of each chip are carried out mould square summation.The power of supposing 948 chips measuring is respectively P
1, P
2... P
948, the emission actual power of terminal is so at this moment
(P
1+RFAtt+IFAtt)，(P
2+RFAtt+IFAtt)...(P
948+RFAtt+IFAtt)
Make X
i=P
i+ RFAtt+IFAtt is X then
1, X
2... X
948Be the transmitting power of making a start.Because the dynamic range of data acquisition module radio-frequency front-end is limited, the low side power that measure this moment, just make a start to close power (thermal noise) not correct through overcompression, but the high-end power of this moment, the transmitting power of just making a start is correct.Therefore the transmitting power of making a start will be organized the number from this and obtain.
Make a start and send signal for the second time.Identical with the signal that sends for the first time.
Send order to data acquisition module and remove radio frequency and intermediate frequency decay, sampled data afterwards obtains on the time shaft sampled data of 948 chips accurately through fine synchronization.
Calculate chip power.It promptly is chip power that 12 sampling complex datas of each chip are carried out mould square summation.The power of supposing 948 chips measuring is respectively Y
1, Y
2... Y
948, because the dynamic range of data acquisition module radio-frequency front-end is limited, the high-end power that measure this moment, the transmitting power of also promptly making a start is not correct through overcompression, but the low side power that measure this moment is correct.That is to say, can organize from this and accurately obtain the power of closing of making a start data.
The data of twice processing are carried out amalgamation can obtain power time (PVT) measured value.This paper has provided a kind of combination method rationally and efficiently.When pad value not being set, the received RF plate can correct measurement the power dynamic range at-90～0dBm, select suitable R FAtt and IFAtt, RFAtt=28dBm for example, IFAtt=9dBm can be-53～37dBm so that record the dynamic range of actual power, carry out amalgamation for twice just can obtain-dynamic range of 90～37dBm, satisfied the power dynamic range (surpassing 112dB) of TD-SCDMA terminal.Why select RFAtt=28dBm, IFAtt=9dBm is because this is the maximum attenuation that the received RF plate can be supported.The dynamic range of twice measurement have a common factor (53～0dBm), select a desired value, for example-20dBm can be with twice amalgamation as a result together as the point of interface of twice measurement.
In view of sequence X
1, X
2... X
948Characteristics be that some values of beginning and end of sequence are less and incorrect, middle numerical value is big and correct, therefore seeks from sequence head, up to finding a value greater than-20dBm, notes the sequence number n of this moment
1, continue to seek backward, up to the value that finds last greater than-20dBm, note the sequence number n of this moment
2The data that send owing to make a start for twice are identical, and there is thin simultaneous operation that each data are carried out the precise time location, can think has identical performance number among the result of twice measurement on the time location that same offset is arranged with respect to intermediate code, that is to say at sequence Y
1, Y
2... Y
948In, first value greater than-20dBm also will appear at n
1, and last value greater than-20dBm will appear at n
2Work as sequence number so less than n
1With greater than n
2The time, value in the Y sequence, when sequence number greater than n
1And less than n
2The time, value in the X sequence, just final sequence are Y
1, Y
2... Y
N1-1X
N1, X
N1+1... X
N2, Y
N2+1, Y
N2+2... Y
948, this tectonic sequence has truly reflected the emission of TD-SCDMA terminal and has closed power characteristic over time when satisfying the PVT measurement and needing than the great dynamic range requirement.
Claims (4)
1, a kind of TD-SCDMA terminal radio frequency consistency testing method comprises step:
(1) sends signal in the first time of making a start;
(2) set radio frequency and intermediate frequency decay in receiving end, to after the described signal attenuation that receives of making a start, carrying out data sampling again, and the signal after the sampling is carried out fine synchronization;
The power of the signal after (3) the calculating process fine synchronization, and obtain described transmitting power of making a start;
(4) send signal in the second time of making a start;
(5) remove the radio frequency of described setting and intermediate frequency decay in described receiving end, to carrying out data sampling, and the signal after the sampling is carried out fine synchronization from the described signal that receives of making a start;
(6) calculate power through the signal after the fine synchronization, and obtain described make a start close power;
(7) making a start that make a start transmitting power and the step (6) that step (3) is obtained obtains closed the power amalgamation together, obtains power to time (PVT) measured value.
2, method according to claim 1, wherein said fine synchronization step is further comprising the steps of:
(1) at the described signal of making a start and sending of the data collecting module collected of described receiving end;
(2) data of described collection are carried out filtering through root raised cosine filter;
(3) filtered data are divided into 12 groups, utilize local multiple intermediate code to slide relevant respectively with described 12 groups of data, obtain the relevant peaks maximum a road as the optimum sampling branch road, and utilize the correlation peak position, obtain multiple intermediate code in the filtered 12 times of accurate positions replied immediately in the data sequence of root raised cosine filter;
(4) symmetrical structure according to optimum sampling branch road that obtains in the step (3) and root raised cosine filter produces linear delay, calculates multiple intermediate code 12 times of accurate positions of replying immediately in the data sequence.
3, method according to claim 2, the rolloff-factor of wherein said raised cosine filter are 0.22.
4, method according to claim 2, wherein step (1) also comprises step:
According to the nominal calibration value of described data acquisition module to its acquired signal, extract begin from the nominal time slot before 80 chips, 72 chips signal of totally 1000 chips after the nominal time slot finishes, as the data of described collection.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996802B (en) * | 2006-12-04 | 2010-06-23 | 信息产业部电信研究院 | RF consistency testing system of the time division synchronization and code division multi-address access terminal |
| CN101072420B (en) * | 2007-06-18 | 2010-12-08 | 中兴通讯股份有限公司 | TD-SCDMA transmitter open/close time domain template testing method |
| CN101500250B (en) * | 2008-01-31 | 2011-08-17 | 大唐移动通信设备有限公司 | Fast frequency point conversion method and apparatus |
| CN101384062B (en) * | 2008-09-28 | 2011-12-28 | 深圳国人通信有限公司 | Verification test method for timeslot interval at second switching point of repeater |
| CN101370234B (en) * | 2008-09-28 | 2012-02-01 | 深圳国人通信有限公司 | System and method for testing ascending switch time amount of TD-SCDMA repeater |
| CN101765142B (en) * | 2009-12-25 | 2015-03-04 | 上海闻泰电子科技有限公司 | Method and device for preventing PVT from exceeding standard during GPRS multi-time slot continuous emission |
| WO2018171462A1 (en) * | 2017-03-24 | 2018-09-27 | 中兴通讯股份有限公司 | Power state conversion method and device, terminal, storage medium and processor |
| CN113132178A (en) * | 2020-01-15 | 2021-07-16 | 普天信息技术有限公司 | Protocol consistency test method and device |
Family Cites Families (1)
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| CN1124756C (en) * | 2000-11-14 | 2003-10-15 | 华为技术有限公司 | Gain equalizing method and device based on wide band multiple carrier base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996802B (en) * | 2006-12-04 | 2010-06-23 | 信息产业部电信研究院 | RF consistency testing system of the time division synchronization and code division multi-address access terminal |
| CN101072420B (en) * | 2007-06-18 | 2010-12-08 | 中兴通讯股份有限公司 | TD-SCDMA transmitter open/close time domain template testing method |
| CN101500250B (en) * | 2008-01-31 | 2011-08-17 | 大唐移动通信设备有限公司 | Fast frequency point conversion method and apparatus |
| CN101384062B (en) * | 2008-09-28 | 2011-12-28 | 深圳国人通信有限公司 | Verification test method for timeslot interval at second switching point of repeater |
| CN101370234B (en) * | 2008-09-28 | 2012-02-01 | 深圳国人通信有限公司 | System and method for testing ascending switch time amount of TD-SCDMA repeater |
| CN101765142B (en) * | 2009-12-25 | 2015-03-04 | 上海闻泰电子科技有限公司 | Method and device for preventing PVT from exceeding standard during GPRS multi-time slot continuous emission |
| WO2018171462A1 (en) * | 2017-03-24 | 2018-09-27 | 中兴通讯股份有限公司 | Power state conversion method and device, terminal, storage medium and processor |
| CN113132178A (en) * | 2020-01-15 | 2021-07-16 | 普天信息技术有限公司 | Protocol consistency test method and device |
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