CN102215075A - Method and device for carrying out standing wave detection on antenna - Google Patents
Method and device for carrying out standing wave detection on antenna Download PDFInfo
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- CN102215075A CN102215075A CN2011101498699A CN201110149869A CN102215075A CN 102215075 A CN102215075 A CN 102215075A CN 2011101498699 A CN2011101498699 A CN 2011101498699A CN 201110149869 A CN201110149869 A CN 201110149869A CN 102215075 A CN102215075 A CN 102215075A
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Abstract
The invention discloses a method and device for carrying out standing wave detection on an antenna, and the method and device are used for reducing the complexity for implementing the standing-wave detection and decreasing the detection cost. The method comprises the following steps: adding a new functional module in an FPGA (field programmable gate array) on an RRU (radio remote unit) so as to carry out standing-wave detection on the antenna; acquiring the output data of the antenna; carrying out OPD (output power detection) and RPD (reflection power detection) on the antenna in accordance with the output data of the antenna; and acquiring the SWR (standing-wave ratio) of the antenna in accordance with the OPD and RPD results. Thus, a special detection chip is not required to be added on a PCB (printed circuit board) of the RRU, thereby effectively decreasing the complexity in achieving the circuit layout and detection procedures, reducing the product cost and improving the integration of product design. According to the scheme, the standing-wave detection is carried out on the antenna, thus the implementation way is flexible, the detection accuracy is adjustable, products are convenient to run and maintain, and the overall performance of the system is improved.
Description
Technical field
The present invention relates to communication system, particularly a kind of method and device that antenna is carried out the standing wave detection.
Background technology
At TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) in the wireless communication system, the intrasystem base station of TD-SCDMA product mainly comprises indoor BBU (Building Base band Unit, baseband processing unit) and the RRU of far-end (Remote RF Unit, Remote Radio Unit).
Under the prior art, on the one hand, relatively large or the full load when descending transmit signal power, for guaranteeing that the power amplifier on the RRU does not cause that because of load connects standing wave is poor, thereby cause damaging, usually need earlier RRU to be carried out SWR (Standard Wave Ratio, standing wave detects), determine to carry out again under the normal situation of standing wave the signal emission; On the other hand, in practical engineering application, the Carrier Requirements base station equipment provides the inspection means to antenna feeder system performance, so that in time find the problem that antenna-feedback system exists, thereby repair as early as possible, and then bring into play performance of antenna feeder system to greatest extent, and open the station stage in the installation of base station product, because the equipment connection is unreliable, usually cause the feeder line connectivity problem easily, so opening the station self check stage, before feeder line joint detection process is opened, open automatic pass antenna function, this just need detect by standing wave, obtain the standing wave value of each antenna port of RRU,, thereby avoid the excessive damage that causes device of echo so that in time check the matching state of antenna port; In addition, operator can also standing-wave ratio detect as preventing a kind of monitoring means that antenna is stolen.
So-called standing wave detects, promptly be that each antenna channels to RRU detects, thereby measure the standing wave value of each antenna port of RRU, thereby in time know the matching state of antenna port, standing wave detects and mainly comprises OPD (Output Power Detector, power output detects) and RPD (Return Power Detector, reflection power detects).The TD-SCDMA system adopts the working method of time division duplex, and every 5ms subframe is divided into following time slot: TS0, DWPTS (descending pilot frequency time slot), and GP (protection time slot), UPPTS (uplink pilot time slot), TS1, TS2 ..., TS6; Wherein, TS0, DWPTS is for fixing descending, UPPTS is for fixing up, because DWPTS is as special time slot, it does not change with downlink business, and position and length in each subframe are consistent substantially, therefore, all are to detect at DWPTS when carrying out OPD and RPD.
At present, method for detecting standing wave commonly used is, on RRU, arrange the dedicated test chip, by (the Field Programmable Gate Array of the FPGA on the RRU, programmable logic device) with each antenna give the dedicated test chip with road clock and control signal, the dedicated test chip will be carried out the statistical value that obtains behind OPD and the RPD and feed back to FPGA, will be for further processing by FPGA then, thereby obtain the standing wave value of each antenna, it realizes that schematic diagram is illustrated in fig. 1 shown below.
Prior art detects owing to adopted the dedicated test chip to carry out standing wave, therefore, needs to be provided with simultaneously dedicated test chip and FPGA on the PCB of RRU (printed circuit board (PCB)) plate face, and this has improved the cost of product undoubtedly; Simultaneously, finish the standing wave detection, therefore, need the accurately interaction flow between design two components and parts, improved the implementation complexity that standing wave detects owing to need FPGA and dedicated test chip to cooperatively interact; In addition, because the increase of components and parts on the pcb board face may cause the area of pcb board face and the increase of layout difficulty, integrated requirement produces certain negative effect to existing integrated circuit board design height for this.
Summary of the invention
The embodiment of the invention provides a kind of antenna is carried out method and the device that standing wave detects, and reduces the implementation complexity that standing wave detects in order to solve, and reduces and detect cost.
The concrete technical scheme that the embodiment of the invention provides is as follows:
A kind of method that antenna is carried out the standing wave detection comprises:
Checkout gear obtains the dateout of antenna;
Checkout gear carries out OPD and RPD according to the dateout of the described antenna that obtains to described antenna;
Checkout gear obtains the standing-wave ratio of described antenna according to the testing result of OPD and RPD.
A kind of checkout gear that antenna is carried out the standing wave detection comprises:
Acquiring unit is used to obtain the dateout of antenna;
Detecting unit is used for the dateout according to the described antenna that obtains, and described antenna is carried out OPD and RPD;
Computing unit is used for obtaining according to the testing result of OPD and RPD the standing-wave ratio of described antenna.
In the embodiment of the invention, realized the standing wave of antenna is detected by setting up new functional module among the FPGA on RRU, no longer needing additionally on the pcb board face of RRU increases a dedicated test chip, thereby effectively reduce the implementation complexity of circuit layout and testing process, simultaneously, reduce product cost again, improved the integrated of product design; Adopt such scheme that antenna is carried out standing wave and detect, implementation is flexible, and accuracy of detection is adjustable, is convenient to product operation and maintenance, has improved the overall performance of system.
Description of drawings
Fig. 1 is that standing wave detects principle schematic under the prior art;
Fig. 2 is that standing wave detects principle schematic in the embodiment of the invention;
Fig. 3 is a FPGA illustrative view of functional configuration in the embodiment of the invention;
Fig. 4 is that standing wave detects schematic flow diagram in the embodiment of the invention;
Fig. 5 is OPO and a RPD execution schematic diagram in the embodiment of the invention;
This distinguishes that standing wave detects detail flowchart in the example to Fig. 6 for the present invention.
Embodiment
In order to reduce the implementation complexity that standing wave detects, and reduce and detect cost, consult shown in Figure 2ly, in the embodiment of the invention, do not re-use the patent detection chip and carry out standing wave and detect, but in checkout gear, set up new functional module, make checkout gear can be directly realize that according to statistics standing wave detects to the dateout of antenna, like this, on the basis that replaces the dedicated test chip, both the standing wave measuring ability be can realize, implementation complexity and product cost reduced simultaneously again.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Figure 3, in the embodiment of the invention, checkout gear (as, comprise acquiring unit 30, detecting unit 31 and computing unit 32 in FPGA), wherein,
Acquiring unit 30 is used to obtain the dateout of antenna; Preferable, acquiring unit 30 can be the feedback ADC (analog to digital converter) on the RRU;
Detecting unit 31 is used for the dateout according to the antenna that obtains, and antenna is carried out OPD and RPD;
Computing unit 32 is used for the standing-wave ratio according to the testing result acquisition antenna of OPD and RPD.
As shown in Figure 3, in the embodiment of the invention, also be provided with Alarm Unit 33 in the checkout gear, be used for when the cumulative frequency of the standing wave alarm of determining computing unit 32 statistics reaches setting threshold, the data that described antenna is interrupted in indication send, and carry out alarming processing.Preferable, in the present embodiment, checkout gear can be FPGA.
In the present embodiment, be that FPGA is that example is introduced with checkout gear.
Based on technique scheme, to consult shown in Figure 4ly, in the embodiment of the invention, it is as follows that the FPGA on the RRU carries out the detailed process that standing wave detects to the antenna on the RRU passage:
Step 400:FPGA obtains the dateout of antenna.
In the present embodiment, the dateout that FPGA can an antenna of single treatment also can be handled the dateout of many antennas simultaneously, in following examples, all is to be that example is carried out related description with an antenna.So-called dateout promptly is meant the clock signal and the control signal of antenna.
On the other hand, in the present embodiment, during the dateout of FPGA statistics antenna, be the dateout of obtaining antenna by feedback ADC (analog to digital converter).
Step 410:FPGA carries out OPD (power output detection) and RPD (reflection power detection) according to the dateout of the antenna that obtains to this antenna.
In the embodiment of the invention, it in fact promptly is that antenna is carried out OPD and RPD that standing wave detects, and calculates standing-wave ratio according to testing result, and the value of standing-wave ratio promptly is the result that standing wave detects.Be specially:
Consult shown in Figure 5ly, DWPTS does not change with downlink business usually as special time slot, and promptly position in each subframe and length are consistent substantially, and therefore, OPD and RPD all carry out at DWPTS; As shown in Figure 5; since single DwPTS by duration be 32chip (chip) protection at interval and duration be that the downlink synchronous sequence of 64chip is formed; therefore; when carrying out OPD; actual count be the power output of the downlink synchronous sequence of 64chip among each DWPTS; in like manner, when carrying out RPD, actual count be the reflection power of the downlink synchronous sequence of 64chip among each DWPTS.
In the present embodiment, add up power output or the reflection power of certain DWPTS, be also referred to as the energy value of this DWPTS of statistics, be designated as ∑ (fb_adc_data
2), fb_adc_data is the dateout of antenna, the fb_adc_data that receives in a subframe promptly can be used to carry out OPD, also can be used to carry out RPD; Be that OPD and RPD can adopt above-mentioned formula to calculate corresponding P
OPDAnd P
RPDThe content difference of the dateout fb_adc_data that only is to use, because OPD and RPD need the input data of adding up just different separately, though all be energy value outwardly at statistics DwPTS place, but the content of the input data that OPD added up is returned after the power amplifier coupling, and the content of the input data that RPD added up is returned through circulator, in brief, though OPD and RPD do statistics to the energy value of same time slot position, but the input source data are from different places, therefore output content is had any different naturally, thereby causes P
OPDAnd P
RPDValue also inequality, on the other hand, in the present embodiment, because what power output adopted is the DSP48 calculating of FPGA inside, so the length of output power value is generally 48bits, but according to the available accuracy needs, only need to keep its 1bit sign bit, intercept 31bits then from remaining 47bits again, the data of having pieced together 32bits altogether can meet the demands P
OPDAnd P
RPDAll be to adopt the mode of this 32bits to represent; On the other hand, in fact the data content of fb_adc_data is exactly I data and the input of Q data plural number, fb_adc_data is the general designation synonym of this complex data, the I data are exactly the imaginary part component of fb_adc_dat, the R data are exactly the real component of fb_adc_dat, therefore, ∑ (fb_adc_data
2) can be expressed as ∑ I again
2+ Q
2, P
OPDAnd P
RPDCalculate and all adopt this formula.
As shown in Figure 5, taking 5ms with a subframe is example, in a subframe, can only carry out one-time detection at DWPTS, promptly the dateout that receives in a subframe can only be used to carry out OPD or RPD, and is preferable, and OPD and RPD carry out every frame, the duration of finishing OPD and RPD is 10ms, promptly takies two subframes.
Step 420:FPGA obtains the standing-wave ratio of antenna according to the testing result of OPD and RPD.
In the present embodiment, the concrete executive mode of step 420 is: FPGA is one group with per two adjacent sub-frame, based on the OPD of each group subframe correspondence and the testing result of RPD, adopts formula pswr_value=10log (P respectively
OPD/ P
RPD) calculate the standing-wave ratio that each organizes the subframe correspondence respectively, wherein, pswr_value represents the standing-wave ratio of one group of subframe correspondence, P
OPDExpression is at the testing result of a subframe execution OPD in this group of subframe, P
RPDThe testing result of RPD is carried out in expression at another subframe in this group of subframe.
In each group subframe, can carry out OPD at a subframe earlier, carry out RPD at another subframe again, also can carry out RPD at a subframe earlier, carry out OPD at another subframe again, between every group of subframe, the execution sequence of OPD and RPD also can be inequality, and concrete executive mode is pre-configured by administrative staff.In the present embodiment, preferable, carry out OPD and RPD in the following ways, as shown in Figure 4, at each subframe that comprises in the antenna dateout, OPD carries out once every a frame, what detect is the downlink synchronous sequence of the 64chip that comprises in the DWPTS in the corresponding subframe, in like manner, RPD carries out once every a frame, detection also be the downlink synchronous sequence of the 64chip that comprises in the DWPTS in each subframe, and OPD and RPD do not carry out in same subframe, therefore, the duration of finishing OPD and RPD is 10ms, and promptly every two adjacent subframe one batch totals are calculated a standing-wave ratio.
Adopt aforesaid way, per two subframes are calculated in the process of a standing-wave ratio, can write down the value of the standing-wave ratio of each calculating acquisition, be designated as pswr_value, and the pswr_value that will calculate acquisition each time compares with the standing-wave ratio threshold value pswr_threshold that presets, in case the situation of pswr_value＜pswr_threshold occurs, just with cumulative frequency+1 of standing wave alarm, accumulative frequency until the standing wave alarm surpasses setting threshold, (this threshold value can be carried out pre-configured according to the empirical value in the actual application), produce and interrupt alarm, notification processor carries out relevant treatment.Wherein, why pswr_value＜pswr_threshold is set is Rule of judgment, is because pswr_value=10log (P
OPD/ P
RPD), P
OPDFor a subframe being carried out the testing result that OPD obtains, under the perfect condition, P
OPDValue is big more, and the reception of the reception object of antenna is good more, and P
RPDFor a subframe being carried out the testing result that RPD obtains, under the perfect condition, P
RPDValue is more little, and the reception of the reception object of antenna is good more, therefore, and P
OPD/ P
RPDValue big more, illustrate that the reception of reception object of antenna is good more, so, when pswr_value＜pswr_threshold, illustrate that the reception of the reception object of antenna has surpassed lower limit, need the alarm line correlation of going forward side by side to handle.
Consult shown in Figure 6ly, with a concrete implementing procedure the foregoing description is made being described in further detail below.
Step 600:FPGA obtains the dateout of antenna, and this dateout comprises some subframes.
In the present embodiment, FPGA can obtain the dateout of antenna in real time by built-in feedback ADC, and reads each subframe that this dateout comprises successively, and each subframe that identifies by subframe.
Step 610:FPGA carries out OPD to a subframe (being called subframe x) that reads.
Step 620:FPGA carries out RPD to next subframe (being called subframe y) that reads.
In the practical application, also can in step 610, carry out RPD earlier, in step 620, carry out OPD again, only for for example, repeat no more herein.
Step 630:FPGA calculates corresponding standing-wave ratio according to the testing result of OPD that obtains and RPD.
Promptly be to adopt formula pswr_value=10log (P
OPD/ P
RPD) calculate the standing-wave ratio of subframe x and subframe y correspondence.
Does step 640:FPGA judge that whether the standing-wave ratio of current calculating acquisition is less than default standing-wave ratio threshold value, i.e. pswr_value＜pswr_threshold? if then execution in step 650; Otherwise, return step 610.
Step 650:FPGA adds 1 with the cumulative frequency of standing wave alarm, then, and execution in step 660.
Does step 660:FPGA judge that the cumulative frequency of standing wave alarm reaches setting threshold? if then execution in step 670; Otherwise, return step 610.
The data output of antenna is interrupted in step 670:FPGA indication, and carries out alarming processing.
So-called alarming processing, promptly be FPGA with the present case notification processor, as, CPU, by CPU by man-machine interface to administrative staff's prompt alarm information, perhaps, carry out fault restoration automatically, or the like, do not repeat them here.
As shown in Figure 6, in the above-described embodiments, step 610 of every execution all can be synchronously compares the testing result of the OPD that obtains and default OPD threshold value, promptly judges P
OPD＞P
OPD_ threshold? in follow-up flow process, when definite standing wave alarm cumulative frequency reached setting threshold, FPGA was in step 660 ' in obtain P before reading
OPD＞P
OPDThe comparative result of _ threshold carries out reference, determines to satisfy P
OPD＞P
OPDDuring _ threshold, the data output of antenna is interrupted in indication again, and carries out alarming processing, if do not satisfy P
OPD＞POPD_threshold does not then produce and interrupts alarm, and certainly, FPGA also can be after definite standing wave alarm cumulative frequency reaches setting threshold, again in step 660 ' in obtain the OPD of buffer memory testing result compare i.e. P with the OPD threshold value of presetting
OPD＞P
OPD_ threshold, aforesaid way are for example.Wherein, P
OPD_ threshold is P
OPDMinimum comparison threshold is why before doing standing-wave ratio and interrupting alarm, earlier with P
OPDWith P
OPD_ threshold once compares, and is because if the P that counts on
OPDGreater than set P
OPDDuring _ threshold, P
OPDJust be considered to the effective value that meets the demands, just have and follow-up standing-wave ratio is interrupted the correct meaning of judging of alarm, if the P that counts on
OPDVery little, promptly be lower than set P
OPDDuring _ threshold, this value is unusual, does not meet the demands, therefore also just do not have follow-up the continuation to do necessity of standing-wave ratio interruption alarm, in brief, it is equivalent to a precondition of doing standing-wave ratio interruption alarm and judges, certainly, according to the difference of practical application scene, P can not appear if determine
OPDUnusual situation also can not carried out above-mentioned decision operation, herein only for giving an example.
In the embodiment of the invention, realized the standing wave of antenna is detected by setting up new functional module among the FPGA on RRU, no longer needing additionally on the pcb board face of RRU increases a dedicated test chip, thereby effectively reduce the implementation complexity of circuit layout and testing process, simultaneously, reduce product cost again, improved the integrated of product design; Adopt such scheme that antenna is carried out standing wave and detect, implementation is flexible, and accuracy of detection is adjustable, is convenient to product operation and maintenance, has improved the overall performance of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the method that antenna is carried out the standing wave detection is characterized in that, comprising:
Checkout gear obtains the dateout of antenna;
Checkout gear carries out power output to described antenna and detects OPD and reflection power detection RPD according to the dateout of the described antenna that obtains;
Checkout gear obtains the standing-wave ratio of described antenna according to the testing result of OPD and RPD.
2. the method for claim 1 is characterized in that, checkout gear carries out power output to described antenna and detects OPD and reflection power detection RPD according to the dateout of the described antenna that obtains, and comprising:
Each subframe that checkout gear comprises at the described dateout that obtains is carried out an OPD every a frame, and carries out a RPD every a frame, and wherein, OPD and RPD do not carry out in same frame.
3. method as claimed in claim 2 is characterized in that, checkout gear obtains the standing-wave ratio of described antenna according to the testing result of OPD and RPD, comprising:
Checkout gear is one group with per two adjacent sub-frame, based on the OPD of each group subframe correspondence and the testing result of RPD, adopts formula pswr_value=10log (P respectively
OPD/ P
RPD) calculate the standing-wave ratio that each organizes the subframe correspondence respectively, wherein, pswr_value represents the standing-wave ratio of one group of subframe correspondence, P
OPDExpression is at the testing result of a subframe execution OPD in this group of subframe, P
RPDThe testing result of RPD is carried out in expression at another subframe in this group of subframe.
4. as claim 1,2 or 3 described methods, it is characterized in that, further comprise:
Standing-wave ratio of the every calculating of checkout gear compares the standing-wave ratio that calculate to obtain and default standing-wave ratio threshold value, when determining to calculate the standing-wave ratio that obtains less than default standing-wave ratio threshold value, the cumulative frequency of standing wave alarm is added 1.
5. method as claimed in claim 4 is characterized in that, further comprises:
When checkout gear determined that the cumulative frequency of described standing wave alarm reaches setting threshold, the data that described antenna is interrupted in indication sent, and carry out alarming processing; Perhaps,
Checkout gear determines that the cumulative frequency of described standing wave alarm reaches setting threshold, and the testing result of OPD is during greater than default OPD minimum threshold, and the data that described antenna is interrupted in indication send, and carry out alarming processing.
6. as claim 1,2 or 3 described methods, it is characterized in that described checkout gear is programmable logic device FPGA.
7. the checkout gear that antenna is carried out the standing wave detection is characterized in that, comprising:
Acquiring unit is used to obtain the dateout of antenna;
Detecting unit is used for the dateout according to the described antenna that obtains, and described antenna is carried out power output detect OPD and reflection power detection RPD;
Computing unit is used for obtaining according to the testing result of OPD and RPD the standing-wave ratio of described antenna.
8. checkout gear as claimed in claim 7 is characterized in that, described detecting unit carries out power output to described antenna and detects OPD and reflection power detection RPD according to the dateout of the described antenna that obtains, and comprising:
Each subframe that described detecting unit comprises at the described dateout that obtains is carried out an OPD every a frame, and carries out a RPD every a frame, and wherein, OPD and RPD do not carry out in same frame.
9. checkout gear as claimed in claim 8 is characterized in that, described computing unit obtains the standing-wave ratio of described antenna according to the testing result of OPD and RPD, comprising:
Described computing unit is one group with per two adjacent sub-frame, based on the OPD of each group subframe correspondence and the testing result of RPD, adopts formula pswr_value=10log (P respectively
OPD/ P
RPD) calculate the standing-wave ratio that each organizes the subframe correspondence respectively, wherein, pswr_value represents the standing-wave ratio of one group of subframe correspondence, P
OPDExpression is at the testing result of a subframe execution OPD in this group of subframe, P
RPDThe testing result of RPD is carried out in expression at another subframe in this group of subframe.
10. as claim 7,8 or 9 described checkout gears, it is characterized in that, further comprise:
Described computing unit is further used for, and standing-wave ratio of every calculating compares the standing-wave ratio that calculate to obtain and default standing-wave ratio threshold value, when determining to calculate the standing-wave ratio that obtains less than default standing-wave ratio threshold value, the cumulative frequency of standing wave alarm is added 1.
11. checkout gear as claimed in claim 10 is characterized in that, further comprises:
Alarm Unit, when the cumulative frequency that is used for determining the standing wave alarm of described computing unit statistics reached setting threshold, the data that described antenna is interrupted in indication sent, and carry out alarming processing; Perhaps, the cumulative frequency that is used for the standing wave alarm of definite described computing unit statistics reaches setting threshold, and when described detecting unit was carried out testing result that OPD obtains greater than default OPD minimum threshold, the data that described antenna is interrupted in indication sent, and carry out alarming processing.
12., it is characterized in that described checkout gear is programmable logic device FPGA as claim 7,8 or 9 described checkout gears.
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| CN2011101498699A CN102215075A (en) | 2011-06-03 | 2011-06-03 | Method and device for carrying out standing wave detection on antenna |
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| CN104243065A (en) * | 2014-09-01 | 2014-12-24 | 大唐移动通信设备有限公司 | Method and device for standing-wave ratio detection |
| CN113498097A (en) * | 2020-04-01 | 2021-10-12 | 成都鼎桥通信技术有限公司 | Standing wave warning method and equipment suitable for small base station piggyback antenna scene |
| CN116938358A (en) * | 2023-07-31 | 2023-10-24 | 南京威翔科技有限公司 | Processing method of standing-wave ratio detection data of antenna feeder or antenna combiner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104243065A (en) * | 2014-09-01 | 2014-12-24 | 大唐移动通信设备有限公司 | Method and device for standing-wave ratio detection |
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| CN113498097A (en) * | 2020-04-01 | 2021-10-12 | 成都鼎桥通信技术有限公司 | Standing wave warning method and equipment suitable for small base station piggyback antenna scene |
| CN113498097B (en) * | 2020-04-01 | 2023-04-14 | 成都鼎桥通信技术有限公司 | Standing wave warning method and equipment suitable for small base station piggyback antenna scene |
| CN116938358A (en) * | 2023-07-31 | 2023-10-24 | 南京威翔科技有限公司 | Processing method of standing-wave ratio detection data of antenna feeder or antenna combiner |
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Application publication date: 20111012 |