CN105025503B - A kind of standing-wave ratio detecting method and system of TD-LTE RRU - Google Patents
A kind of standing-wave ratio detecting method and system of TD-LTE RRU Download PDFInfo
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Abstract
The invention discloses a kind of standing-wave ratio detecting methods and system of TD LTE RRU, including obtain the configuration information of TD LTE radio frames；Calculate first GP slot starting point time span；It is inserted into tone signal within the GP periods；Acquire the forward and backward performance number acquisition measurement return loss value that tone signal is inserted into the GP periods；Actual return loss value is obtained as first passing through the return loss calibration value obtained by Network Analyzer calibration in advance；Actual standing wave ratio is obtained by the return loss value after calibration.Method using the present invention, which can conveniently realize, improves TD LTE RRU standing-wave ratio accuracy in detection, while ensureing that TD LTE system performances are unaffected.
Description
Technical field
The present invention relates to mobile communication fields, a kind of standing-wave ratio detecting method particularly with regard to TD-LTE RRU and are
System.
Background technology
LTE is by the long term evolution of the 3GPP UMTS technical standards organized to set up, i.e., said 4G.With 4G licence plates
Successive granting, 4G enters extensive networking stage, especially high-power RRU device demand and sharply increases, to the property of equipment
It can be required with the self-shield of equipment also higher and higher.Standing-wave ratio is protected as prevention at radio-frequency port and power amplifier match condition is weighed
Shield power amplifier does not cause power amplifier to damage because matching deteriorates, it is therefore necessary to carry out standing-wave ratio detection in real time.In TD-
Since there are the switchings of uplink and downlink signals in LTE system, and powerful device improves system performance, detection using DPD algorithms
Drastically deteriorate there are system performance when standing-wave ratio and standing-wave ratio accuracy in detection is not enough asked according at standing-wave ratio wrong report, equipment damage
Topic.
It is as follows to introduce LTE technical field essential terms：
1、RRU：Remote RF Unit, Remote Radio Unit
2、LTE：Long Term Evolution, long term evolution plan
3、TD-LTE：Time Division Long Term Evolution, time-division long term evolution
4、FDD-LTE：Frequency Division Duplex Long Term Evolution, frequency division duplex are long-term
Evolution
5、VSWR：Voltage Standing Wave Ratio, voltage standing wave ratio
6、DPD：Digital Pre-Distortion, digital pre-distortion
7、GP：Guard Period protect time slot
8、RL：Return Loss, return loss
9、CP：Cyclic Prefix, cyclic prefix
10、DwPTS：Downlink Pilot Time Slot, descending pilot frequency time slot
11、UpPTS：Uplink Pilot Time Slot, uplink pilot time slot
In order to improve the accuracy of TD-LTE RRU standing-wave ratios detection, there are two types of general ways at present：One is acquisitions
The forward power and backward power value of adjacent two frame obtain return loss value and carry out standing-wave ratio calculating, and for this method, there are two
A problem, one be system work acquisition forward feedback signal when there are preceding reversed switchings, will necessarily be according to the evil at DPD performances
Change, the other is, when there is significant change in equipment output power due to be not detection synchronization preceding backward power value
The return loss of acquisition, there are errors for the standing-wave ratio of detection, inaccurate according to the standing-wave ratio at detection.Another kind be by detect before to
Power and corresponding base band power and backward power and corresponding base band power, obtain forward power relative to base band power gain
Value and backward power calculate return loss value and carry out standing-wave ratio detection, by this method relative to base band power yield value
There is certain improvement relative to first method, can ensure the base band power point of acquisition with before by time delay in accurate measurement plate
To power collecting point and base band power point same one piece of data corresponding with backward power collection point, but it is special when equipment is produced in batches
It is to deposit onboard delay variation after having hardware device correcting to need to re-start accurate measurement, other system similar to the first way
There are preceding reversed switchings when work acquisition forward feedback signal of uniting, according at system performance degradation problem.
Invention content
The object of the present invention is to provide a kind of TD-LTE RRU standing-wave ratios detection technique schemes, it is intended to solve detection standing-wave ratio
When system performance degradation and detection standing-wave ratio the problem of being not allowed to cause wrong report.
The present invention provides a kind of standing-wave ratio detecting method of TD-LTE RRU, includes the following steps：
Step 1, the configuration information of TD-LTE radio frames is obtained；
Step 2, according to the configuration information of step 1 gained TD-LTE radio frames, first protection in a radio frames is obtained
Length Tgp of the starting point of time slot relative to the shift time T1 and protection time slot of frame head；
Step 3, shift time T2 is signal insertion point on the basis of being set in protection slot starting point, is inserted into time span
The tone signal for being P1 for T3, power；If base band scaled power is Pc, the corresponding dynamic range of signal bandwidth is Δ Α Τ Τ,
Then P1=Pc- Δs Α Τ Τ；
Step 4, the shift time Δ Τ behind the signal insertion point of present frame, after acquisition time length is the insertion signal of T4
Forward signal power value；
Step 5, in the signal insertion point of next frame by preceding reversed switching switching to reversed, and be equally inserted into signal
Shift time Δ Τ after point, acquisition time length are reverse signal power value after the insertion signal of T4, will be preceding anti-after the completion of acquisition
To switching switch be switched to again before to；
Step 6, forward signal power value and reverse signal power value after the insertion signal acquired by step 4 and step 5,
Obtain the return loss value RL1 of detection；
Step 7, it is calibrated to obtain actual return loss value RL, RL=RL1+ Δs RL according to return loss calibration value Δ RL；
Step 8, standing-wave ratio testing result is obtained according to actual return loss value obtained by step 7.
Moreover, in step 1, the configuration information of the TD-LTE radio frames includes TD-LTE ascending-descending subframes proportional arrangements letter
Breath, special subframe configuration information, circulating prefix-length select information and signal bandwidth information.
Moreover, in step 2, the shift time T1 is first downlink subframe time span and downlink pilot time length
Sum.
Moreover, in step 3, T2 >=20us, T3≤Tgp-2 × T2.
Moreover, 20us≤T2≤(Tgp-T3)/2, T4+ Δs Τ≤T3≤Tgp-2 × T2, △ T<<T3, T4≤T3- Δ Τ.
Moreover, the acquisition methods of the return loss calibration value Δ RL are, practical end is tested using Network Analyzer in advance
The standing wave ratio of mouth, and it is scaled corresponding return loss value RL2, calculate Δ RL=RL2-RL1.
Moreover, in step 8, standing-wave ratio testing result realization method is obtained according to actual return loss value obtained by step 7
To obtain actual standing wave ratio according to self-built in advance RRU return loss table or standing-wave ratio calculation formula.
The present invention further correspondingly provides a kind of standing-wave ratio detecting system of TD-LTE RRU, which is characterized in that including as follows
Module：Configuration information extraction module, the configuration information for obtaining TD-LTE radio frames；
Slot starting point information extraction modules, for the configuration according to TD-LTE radio frames obtained by configuration information extraction module
Information obtains shift time T1 and protection time slot of the starting point relative to frame head of first protection time slot in a radio frames
Length Tgp；Tone signal is inserted into module, is inserted into for signal for shift time T2 on the basis of being set in protection slot starting point
Point, be inserted into time span be T3, the tone signal that power is P1；If base band scaled power is Pc, the corresponding dynamic of signal bandwidth
Ranging from Δ Α Τ Τ, then P1=Pc- Δs Α Τ Τ；
Forward power extraction module, for shift time Δ Τ, acquisition time length behind the signal insertion point of present frame
For forward signal power value after the insertion signal of T4；
Backward power extraction module, for the signal insertion point of next frame will preceding reversed switching switching to reversely,
And the shift time Δ Τ equally behind signal insertion point, acquisition time length are reverse signal power value after the insertion signal of T4,
Before preceding reversed switching switch is switched to again after the completion of acquisition to；
Return loss value computing module is inserted for what is acquired by forward power extraction module and backward power extraction module
Enter forward signal power value and reverse signal power value after signal, obtains return loss value RL1 when test；
Return loss value correction module, for calibrating to obtain actual return loss value according to return loss calibration value Δ RL
RL, RL=RL1+ Δ RL；
Standing-wave ratio output module, for obtaining standing wave according to actual return loss value obtained by return loss value correction module
Compare testing result.
The present invention has the advantages that following and good effect：
1, the technical program can easily realize the accuracy for improving detection TD-LTE RRU standing-wave ratios, need not accurately survey
Measure delay of the forward/reverse radio frames relative to downlink radio frame.
2, while the technical program can easily realize the accuracy for improving detection TD-LTE RRU standing-wave ratios, ensure
TD-LTE system performance is not influenced by standing-wave ratio detection and is deteriorated.
Description of the drawings
Fig. 1 is downlink radio frame of the embodiment of the present invention and forward/reverse radio frames timing diagram.
Fig. 2 is the flow chart of the embodiment of the present invention.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments.
When it is implemented, software technology implementation process automatic running can be used in the present invention.Downlink radio frame shown in Figure 1
With forward/reverse radio frames sequential relationship, the embodiment of the present invention includes following steps：
Step 1, the configuration information of TD-LTE radio frames is obtained.
When it is implemented, the configuration information of the TD-LTE radio frames includes TD-LTE ascending-descending subframes proportional arrangements letter
Breath, special subframe configuration information, circulating prefix-length select information and signal bandwidth information.
Step 2, the configuration information of the TD-LTE radio frames obtained according to step 1 obtains first protection in a radio frames
Length Tgp of the time slot GP starting points relative to the shift time T1 and GP of frame head.
It selects to believe according to TD-LTE ascending-descending subframes proportional arrangements information, special subframe configuration information and circulating prefix-length
Breath, can obtain the length Tgp of shift time T1 and GP.Offset of the first protection time slot GP starting points relative to frame head
Time T1 is the sum of first downlink subframe time span and downlink pilot time length, and Tgp can be tabled look-up by configuration information and be obtained
It takes.
Step 3, shift time T2 is signal insertion point on the basis of being set in GP starting points, and insertion time span is T3,
It is inserted into the tone signal (i.e. the sinusoidal signal of single-frequency) that power is P1.
When it is implemented, shift time T2 is more than or equal to 2 times of system clock maximum drift time, it is ensured that be inserted into signal
Starting point within the GP periods, such as in system index clock keep it is most severe when clock drift be 10us, then T2 >=20us (=
2×10us).To ensure to be inserted into signal in system clock drift maximum, when being inserted into signal without falling into DwPTS and UpPTS special
In gap, then suggest being inserted into time span T3≤Tgp-2 × T2.It is inserted into signal power and needs sufficiently large raising in equipment linearly interval
The preceding backward power intensity of coupling, while ensureing that i.e. only there are one will not be to insert when DPD operations when resource block in power minimum
Enter signal and do calibration operation, be then inserted into tone signal, be inserted into performance number when signal power is a resource block, meter base band calibrates work(
Rate is Pc, and the corresponding dynamic range of signal bandwidth is Δ Α Τ Τ, then is inserted into signal power P1=Pc- Δ Α Τ Τ.It is specific real
Shi Shi can determine Δ Α Τ Τ according to signal bandwidth information.
Step 4, the forward power of shifted signal insertion point △ T acquisition times T4：It is retrodeviated in the signal insertion point of present frame
It moves the Δ Τ times, forward signal power value after the insertion signal that acquisition time length is T4.
If baseband signal collects the time delay of preceding reverse signal to RRU, i.e., preceding reversed delay is Tdl.△ T times are used
Delay of the reverse signal relative to downlink signal before compensation, while delay difference between equipment is compensated, need △ T>>Tdl, simultaneously
△T<<T3.For acquisition time length T4, the preceding reverse signal to ensure acquisition needs T4≤T3- △ within the period of insertion
T.According to custom,>>Expression is much larger than,<<Expression is much smaller than.
Therefore, present invention further propose that, time Tgp, T2, T3, Δ Τ, T4, Tdl relationship be, 20us≤T2≤
(Tgp-T3)/2, T4+ Δs Τ≤T3≤Tgp-2 × T2, Tdl<<△T<<T3, T4≤T3- Δ Τ.Because of Tdl<<△T<<T3 is adopted
The preceding backward power value of collection, which is always fallen, to be inserted into signal time segment limit, does not have to when specific implementation accurate measure Tdl, △ T<<
T3.
Step 5, the backward power of neighbor frame offset signal insertion point △ T acquisition times T4：It is inserted into the signal of next frame
Point will preceding reversed switching switching to reversely, and the shifted by delta Τ times equally behind signal insertion point, acquisition time length are
Reverse signal power value after the insertion signal of T4, before preceding reversed switching switch is switched to again after the completion of acquisition to.
Preceding reversed switching switching to reversed time section be in the GP sections of radio frames.
Step 6, pass through forward signal power value and reverse signal power value after step 4 and the insertion signal of step 5 acquisition
Obtain the return loss value RL1 of detection.
When it is implemented, reverse signal power value can be subtracted by forward signal power value, return loss value RL1 is obtained.
Step 7, the return loss value that 6 gained of calibration steps detects, it is RL to count actual return loss value.
It is RL, RL=RL1+ Δs RL that embodiment, which obtains return loss calibration value Δ RL and calibrates actual return loss value,.
Specific implementation can use the standing wave ratio of Network Analyzer test actual port in advance, be scaled corresponding echo damage
Consumption value RL2.
The return loss value RL2 obtained with Network Analyzer test is true return loss value, then described actual time
Wave loss RL meets RL=RL2=RL1+ (RL2-RL1), counts Δ RL=RL2-RL1, then RL=RL1+ Δs RL, seeks Δ in advance
After RL, in system normal operation, Δ RL can be used as configuration parameter and be configured to RRU, and RL1 acquires calculating and obtains in real time.
Step 8, actual standing wave ratio, i.e. standing-wave ratio can be obtained by tabling look-up or calculating according to the return loss value of step 7
Testing result.
Include tabling look-up and calculating two methods to obtain actual standing wave ratio after acquisition return loss value.
Below to detect TD-LTE RRU ascending-descending subframes proportional arrangement information as 3, special subframe configuration information is 4 and follows
Ring prefix length selects information for routine CP, signal bandwidth 20MHz, and base band scaled power applies this implementation for being -14dBFS
Example technical solution illustrates, and detailed process is as shown in Figure 2：
Step 101, the configuration information of TD-LTE radio frames is obtained.
The present invention needs to obtain the configuration information of the TD-LTE radio frames of TD-LTE RRU devices in advance before configuring cell,
The information is the configuration information that Base Band Unit is allocated to RRU by IR interfaces.
Step 102, shift time T1 of the GP starting points relative to frame head is calculated.
It is 3 according to the ascending-descending subframes proportional arrangement information of the present embodiment TD-LTE radio frames, special subframe configuration information
For 4 and circulating prefix-length select information for conventional CP.According to table 1, ascending-descending subframes proportional arrangement information each subframe letter when being 3
Breath be DSUUUDDDDD, according to table 2, special subframe configuration information be 4 and circulating prefix-length select information for conventional CP when
The corresponding time span of DwPTS, GP, UpPTS is 26336Ts, 2192Ts, 2192Ts, then GP starting points are relative to the inclined of frame head
Shift time T1=1ms+26336 × (10ms/307200)=1857.3us, while available GP length Tgp=2192 ×
(10ms/307200)=71.3us.
Table 1：TD-LTE ascending-descending subframes proportional arrangements
D：Downlink subframe S：Special subframe U：Sub-frame of uplink
Table 2：TD-LTE special subframe configuration informations
Step 103, it is the tone signal that P1 time spans are T3 that offset GP starting points T2, which is inserted into power,.
Shift time T2 value ranges are 20us≤T2≤(Tgp-T3)/2, and it is 20us that this example, which takes T2,.According to this example signal
Bandwidth 20MHz, then the dynamic range of signal is 20dB, back-off Δ Α Τ Τ=20dB, according to this example base band scaled power
For Pc=-14dBFS, then power P 1=Pc- Δ Α Τ Τ=- 14dBFS-20dB=-34dBFS of signal is inserted into.It is inserted into signal
Time segment length T3 value range is T4+ Δs Τ≤T3≤Tgp-2 × T2, then T3≤Tgp-2 × T2=71.3us-2 × 20us
=31.3us, this example T3 take 20us.
Step 104, the forward power Pf of shifted signal insertion point Δ Τ acquisition times T4.
Shifted signal insertion point Δ Τ be the same radio frames downlink data of compensation relative to the delay of forward/reverse data and
Delay difference between equipment, descending physical link is 500ns relative to the delay of forward/reverse physical link in this example, preceding reversed
Data processing delay is 200ns, Tdl=700ns, i.e., need to compensate 700ns, while considering that distinct device and compatible equipment correcting are poor
Different Δ Τ>>700ns and Δ Τ<<T3=20us, this example Δ Τ take 10us.Acquisition time T4 value ranges are T4≤T3- Δs Τ
=20us-10us=10us, this example T4 take 10us, acquisition power to be calculated as Pf.
Step 105, the backward power Pb of neighbor frame offset signal insertion point Δ Τ acquisition times T4.
After being switched to preceding reverser reversely behind adjacent frame signal insertion point, it is as step 104 unanimously takes Δ Τ
10us, T4=10us, collect backward power Pb, and before preceding reverser is switched to.
Step 106, the return loss value RL1 for obtaining detection is calculated.
According to step 104 and step 105 then return loss value RL1=Pf-Pb.
Step 107, inquiry, which obtains return loss calibration value Δ RL and calculates, obtains actual ghosts loss value RL.
Network Analyzer test actual port stays when return loss calibration value Δ RL is usually at present equipment manufacture test
Bobbi value is scaled the difference for the return loss value that actual return loss value is obtained with test, and is configured in RRU device,
Δ RL is obtained by inquiring when RRU device shows network operation, passes through the standing wave ratio of Network Analyzer actual test in this example
The return loss value of conversion is RL2, then Δ RL=RL2-RL1.Actual ghosts loss value RL=RL1+ Δs RL.
Step 108, it tables look-up or calculates and obtain standing wave ratio.
Actual return loss value after the calibration obtained according to step 107 passes through RRU device return loss self-built in advance
Table or standing-wave ratio calculation formula obtain actual standing wave ratio.
When it is implemented, modular mode can also be used to provide corresponding system.The embodiment of the present invention accordingly provides one
The standing-wave ratio detecting system of kind TD-LTE RRU, which is characterized in that including following module：
Configuration information extraction module, the configuration information for obtaining TD-LTE radio frames；
Slot starting point information extraction modules, for the configuration according to TD-LTE radio frames obtained by configuration information extraction module
Information obtains shift time T1 and protection time slot of the starting point relative to frame head of first protection time slot in a radio frames
Length Tgp；Tone signal is inserted into module, is inserted into for signal for shift time T2 on the basis of being set in protection slot starting point
Point, be inserted into time span be T3, the tone signal that power is P1；If base band scaled power is Pc, the corresponding dynamic of signal bandwidth
Ranging from Δ Α Τ Τ, then P1=Pc- Δs Α Τ Τ；
Forward power extraction module, for shift time Δ Τ, acquisition time length behind the signal insertion point of present frame
For forward signal power value after the insertion signal of T4；
Backward power extraction module, for the signal insertion point of next frame will preceding reversed switching switching to reversely,
And the shift time Δ Τ equally behind signal insertion point, acquisition time length are reverse signal power value after the insertion signal of T4,
Before preceding reversed switching switch is switched to again after the completion of acquisition to；
Return loss value computing module is inserted for what is acquired by forward power extraction module and backward power extraction module
Enter forward signal power value and reverse signal power value after signal, obtains return loss value RL1 when test；
Return loss value correction module, for calibrating to obtain actual return loss value according to return loss calibration value Δ RL
RL, RL=RL1+ Δ RL；
Standing-wave ratio output module, for obtaining standing wave according to actual return loss value obtained by return loss value correction module
Compare testing result.
Each module specific implementation is corresponding to step, and it will not go into details by the present invention.
Particular embodiments described above is the preferable embodiment of the present invention, but does not limit the model of spirit of that invention
It encloses.If various possible equivalent changes or replacement to the present invention, and all changes and replacement should all belong to right of the present invention and want
Ask and its protection domain of equivalent technologies within.
Claims (9)
1. a kind of standing-wave ratio detecting method of TD-LTE RRU, which is characterized in that include the following steps：
Step 1, the configuration information of TD-LTE radio frames is obtained；
Step 2, according to the configuration information of step 1 gained TD-LTE radio frames, first protection time slot in a radio frames is obtained
Starting point relative to frame head shift time T1 and protection time slot length Tgp；
Step 3, shift time T2 is signal insertion point on the basis of being set in the starting point of first protection time slot, is inserted into the time
The tone signal that length is T3, power is P1；If base band scaled power is Pc, the corresponding dynamic range of signal bandwidth is Δ Α Τ
Τ, then P1=Pc- Δs Α Τ Τ；
Step 4, the shift time Δ Τ behind the signal insertion point of present frame, acquisition time length are forward direction after the insertion signal of T4
Signal power value；
Step 5, in the signal insertion point of next frame by preceding reversed switching switching to reversed, and equally behind signal insertion point
Shift time Δ Τ, acquisition time length are reverse signal power value after the insertion signal of T4, are reversely cut preceding after the completion of acquisition
Change switch be switched to again before to；
Step 6, it by forward signal power value and reverse signal power value after step 4 and the insertion signal of step 5 acquisition, obtains
The return loss value RL1 of detection；
Step 7, it is calibrated to obtain actual return loss value RL, RL=RL1+ Δs RL according to return loss calibration value Δ RL；
Step 8, standing-wave ratio testing result is obtained according to actual return loss value obtained by step 7.
2. the standing-wave ratio detecting method of TD-LTE RRU according to claim 1, it is characterised in that：In step 1, the TD-
The configuration information of LTE radio frames includes TD-LTE ascending-descending subframes proportional arrangements information, special subframe configuration information, cyclic prefix
Length selects information and signal bandwidth information.
3. the standing-wave ratio detecting method of TD-LTE RRU according to claim 1, it is characterised in that：In step 2, the offset
Time T1 is the sum of first downlink subframe time span and downlink pilot time length.
4. the standing-wave ratio detecting method of TD-LTE RRU according to claim 1, it is characterised in that：In step 3, T2 >=
20us, T3≤Tgp-2 × T2.
5. the standing-wave ratio detecting method of TD-LTE RRU according to claim 4, it is characterised in that：20us≤T2≤(Tgp-
T3)/2, T4+ Δs Τ≤T3≤Tgp-2 × T2, △ T<<T3, T4≤T3- Δ Τ.
6. according to claims 1 or 2 or the standing-wave ratio detecting method of the 3 or 4 or 5 TD-LTE RRU, it is characterised in that：It is described
The acquisition methods of return loss calibration value Δ RL are in advance using the standing wave ratio of Network Analyzer test actual port, and to change
It is corresponding return loss value RL2 to calculate, and calculates Δ RL=RL2-RL1.
7. according to claims 1 or 2 or the standing-wave ratio detecting method of the 3 or 4 or 5 TD-LTE RRU, it is characterised in that：Step
In 8, obtaining standing-wave ratio testing result realization method according to actual return loss value obtained by step 7 is, self-built in advance according to RRU
Return loss table or standing-wave ratio calculation formula obtain actual standing wave ratio.
8. the standing-wave ratio detecting method of TD-LTE RRU according to claim 6, it is characterised in that：In step 8, according to step
The 7 actual return loss values of gained obtain standing-wave ratio testing result realization method and are, according to RRU return loss tables self-built in advance
Or standing-wave ratio calculation formula obtains actual standing wave ratio.
9. a kind of standing-wave ratio detecting system of TD-LTE RRU, which is characterized in that including following module：
Configuration information extraction module, the configuration information for obtaining TD-LTE radio frames；
Slot starting point information extraction modules, for matching confidence according to TD-LTE radio frames obtained by configuration information extraction module
It ceases, length of the starting point of first protection time slot relative to the shift time T1 and protection time slot of frame head in one radio frames of acquisition
Spend Tgp；Tone signal is inserted into module, is letter for shift time T2 on the basis of being set in the starting point of first protection time slot
Number insertion point, be inserted into time span be T3, the tone signal that power is P1；If base band scaled power is Pc, signal bandwidth corresponds to
Dynamic range be Δ Α Τ Τ, then P1=Pc- Δs Α Τ Τ；
Forward power extraction module, for the shift time Δ Τ behind the signal insertion point of present frame, acquisition time length is T4
Insertion signal after forward signal power value；
Backward power extraction module, for the signal insertion point of next frame will preceding reversed switching switching to reversely, and together
Sample shift time Δ Τ behind signal insertion point, acquisition time length are reverse signal power value after the insertion signal of T4, acquisition
Before preceding reversed switching switch is switched to again after the completion to；
Return loss value computing module, the insertion letter for being acquired by forward power extraction module and backward power extraction module
Forward signal power value and reverse signal power value after number obtain return loss value RL1 when test；
Return loss value correction module, for calibrating to obtain actual return loss value RL according to return loss calibration value Δ RL,
RL=RL1+ Δs RL；
Standing-wave ratio output module, for obtaining standing-wave ratio inspection according to actual return loss value obtained by return loss value correction module
Survey result.
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| CN106230763B (en) * | 2016-07-28 | 2019-08-02 | 武汉邮电科学研究院有限公司 | LTE TDD RRU peak-to-average force ratio statistical method based on FPGA |
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