CN102932071B - Offline isolation detection method for digital repeater - Google Patents
Offline isolation detection method for digital repeater Download PDFInfo
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- CN102932071B CN102932071B CN201110227704.9A CN201110227704A CN102932071B CN 102932071 B CN102932071 B CN 102932071B CN 201110227704 A CN201110227704 A CN 201110227704A CN 102932071 B CN102932071 B CN 102932071B
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- 238000002955 isolation Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000012544 monitoring process Methods 0.000 abstract 2
- 238000012545 processing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention discloses an offline isolation detection method for a digital repeater. The method comprises the following steps of: (1) setting the transmission intensity and transmission frequency point of a transmitted signal; (2) performing down-conversion on the received signal received by a receiver to obtain a down-converted signal, and performing first down-conversion sampling on the down-converted signal to obtain a first sampled signal; (3) performing second down-conversion sampling on the first sampled signal to obtain a second sampled signal; (4) filtering an interference signal from the second sampled signal to regain a transmitted signal (5) performing power statistics on the transmitted signal; (6) reporting the obtained power to a monitoring system; and (7) calculating system isolation according to a difference between the intensity of the transmitted signal and the intensity of the received signal by using the monitoring system. According to the method, the addition of a module to repeater equipment is avoided, so that the additional increase of cost of the equipment is avoided.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of method that digital high-frequency amplification station offline isolation detects.
Background technology
The isolation of wireless discharging-directly station dual-mode antenna is an important test parameter when project installation, and dual-mode antenna must meet certain requirement just can leave station, otherwise equipment just may abnormal work and affect the covering of base station.
Traditional isolation detection scheme increases a radio-frequency module in a device, goes out isolation between antennae by the receiving and transmitting signal process computation of radio-frequency module.This scheme will increase a module in repeater equipment, and volume, weight turn increase the cost of equipment while increasing.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, provide a kind of method that digital high-frequency amplification station offline isolation detects, the method does not need to increase module in repeater equipment, thus without the need to additionally increasing the cost of equipment.
Object of the present invention is achieved through the following technical solutions: the method that digital high-frequency amplification station offline isolation detects, and comprises the following steps:
(1) emissive porwer transmitted is set and launches frequency;
(2) down-conversion is carried out to the Received signal strength that receiving terminal receives, obtain down-conversion signal, first time down-conversion sampling is done to down-conversion signal, obtains first time sampled signal;
(3) then the sampling of second time down-conversion is carried out to first time sampled signal, obtain second time sampled signal;
(4) interference signal in the sampling of filtering second time, recovers to transmit;
(5) power statistic is carried out to transmitting of recovery;
(6) power counted on is reported to supervisory control system;
(7) supervisory control system calculates the isolation of system by the difference of the intensity of the intensity that transmits and Received signal strength.
Preferably, the first time down-conversion in described step (2) is sampled as 6 times of down-conversion samplings; Second time down-conversion in described step (3) is sampled as 8 times of down-conversion samplings.
Preferably, the isolation ISO of described step (7) computing system, formula is:
ISO＝P
out+(G-G3)-P
in；
P
outfor the some power frequently produced by numeric field, G2 is the gain after numeric field, and G1 is gain before numeric field, P
infor feedback power, G3 is numeric field gain, complete machine gain G=G1+G2.
The present invention has following advantage and effect relative to prior art: without the need to increasing hardware module in digital high-frequency amplification station equipment, only need add the software program according to the inventive method design in the FPGA module of digital high-frequency amplification station; Thus without the need to additionally increasing the cost of equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of digital high-frequency amplification station;
Fig. 2 is the flow chart of method for detecting isolation between of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 1, method for detecting isolation between of the present invention based on digital high-frequency amplification station be of the prior art, it comprises donor antenna port (DT), power amplifier (being called for short power amplifier, PA), frequency-variable module, low noise amplifier (LNA), digital signal processing module, filter (FIR), user antenna port (MT); Wherein, digital signal processing module comprises the analog to digital converter (ADC), FPGA module and the digital to analog converter (DAC) that connect successively, is provided with digital controlled oscillator (NCO) in FPGA module; Donor antenna port is used for being connected with donor antenna, and user antenna port is used for being connected with user antenna.
At transmitting terminal, FPGA module inside produces a direct current signal, up-converts to after low frequency signal (da_inf) give digital-to-analogue conversion (DA) chip through digital controlled oscillator (NCO); At receiving terminal, FPGA module is carried out down-frequency conversion to the intermediate-freuqncy signal (ad_inf) after the sampling of analog-to-digital conversion (AD) chip by digital controlled oscillator (NCO) and is moved 0 frequently, then (point two-stage is carried out to carry out 48 samplings to 0 frequency signal, first 6 samplings, 8 samplings again), be low pass filter (LP) filtering of 10kHz again through passband, finally will count on average energy and report supervisory control system, to be shown on debugging software interface.
Repeater of the present invention offline isolation detection method is realized by the software that FPGA module is embedded; Take offline inspection mode, when equipment carries out isolation detected state, supervisory control system controls repeater and only opens a sense channel, rest channels Close All.A direct current signal is produced by numeric field, this signal is converted to intermediate frequency through Digital Up Convert module (DUC), change to after radio frequency through up-conversion again, launched by transmitting antenna (TX antenna), the signal launched receives from reception antenna (RX antenna) behind space, after radio-frequency front-end down-conversion, become intermediate frequency, finally enter numeric field with the form of direct current again through Digital Down Converter Module (DDC) frequency conversion.FPGA module can calculate the current isolation of system by the power detecting feedback signal.After equipment exits isolation detected state, supervisory control system controls the passage that repeater recovers to open when normally working again, carries out the amplification of signal.
The formula proving of isolation is as follows:
If the point produced by numeric field frequently power is P
out, the gain after numeric field is G2, and before numeric field, gain is G1, and the feedback power that numeric field receives is P
in, the isolation of dual-mode antenna is ISO, and numeric field gain is G3, complete machine gain G.So have:
ISO＝P
out+G1+G2-P
in…………①
Because (G1+G2) and the gain of complete machine have relation, 1. institute can be deformed into the formula:
ISO＝P
out+(G-G3)-P
in…………②
The processing procedure of above-mentioned core has been come by FPGA module, and as shown in Figure 2, the handling process of FPGA module inside, comprises the steps:
(1) by supervisory control system, the emissive porwer and transmitting frequency that transmit are set;
(2) down-conversion is carried out to the Received signal strength that receiving terminal receives, obtain down-conversion signal, use primary link DDC passage and first time down-conversion sampling (in this enforcement, being 6 times of down-conversion samplings) is done to down-conversion signal, obtain first time sampled signal;
(3) then second time down-conversion sampling (in this enforcement, being 8 times of down-conversion samplings) is carried out to first time sampled signal, obtain second time sampled signal;
(4) interference signal in the sampling of filtering second time, recovers to transmit;
(5) at receiving terminal, power statistic is carried out to transmitting of recovery;
(6) power counted on is reported to supervisory control system;
(7) supervisory control system calculates the isolation of system by the difference of the intensity of the intensity that transmits and Received signal strength; Computing formula be above-mentioned formula 2..
Like this, in the present embodiment, be 48 times of down-conversion samplings after described first time down-conversion sampling, second time down-conversion sample and stack.In the present invention, as long as first time down-conversion sampling, the sampling of second time down-conversion meet Sampling Theorem, namely require FS/ sampling multiple >=2B (FS is the speed that AD converter gives FPGA, and B is the bandwidth of FPGA filters internal), the sampling multiple after superposition is not limited to 48 times.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. a method for digital high-frequency amplification station offline isolation detection, is characterized in that, comprise the following steps:
(1) emissive porwer transmitted is set and launches frequency; At transmitting terminal, FPGA module inside produces a direct current signal, and this signal is converted to intermediate frequency through Digital Up Convert module, then changes to after radio frequency through up-conversion, is launched by transmitting antenna;
(2) at receiving terminal, the signal of transmitting receives from reception antenna behind space, becomes intermediate frequency, after Digital Down Converter Module frequency conversion, become direct current signal after radio-frequency front-end down-conversion;
FPGA module carries out down-conversion to this direct current signal, obtains down-conversion signal, does first time down-conversion sampling, obtain first time sampled signal to down-conversion signal;
(3) then the sampling of second time down-conversion is carried out to first time sampled signal, obtain second time sampled signal;
(4) interference signal in the sampling of filtering second time, recovers to transmit;
(5) power statistic is carried out to transmitting of recovery;
(6) power counted on is reported to supervisory control system;
(7) supervisory control system calculates the isolation of system by the difference of the intensity of the intensity that transmits and Received signal strength.
2. the method for digital high-frequency amplification station offline isolation detection according to claim 1, is characterized in that, the first time down-conversion in described step (2) is sampled as 6 times of down-conversions samplings; Second time down-conversion in described step (3) is sampled as 8 times of down-conversion samplings.
3. the method for digital high-frequency amplification station offline isolation detection according to claim 1, it is characterized in that, the isolation ISO of described step (7) computing system, formula is:
ISO＝P
out+(G-G3)-P
in
P
outfor the some power frequently produced by numeric field, G2 is the gain after numeric field, and G1 is gain before numeric field, P
infor feedback power, G3 is numeric field gain, complete machine gain G=G1+G2.
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| CN201110227704.9A CN102932071B (en) | 2011-08-10 | 2011-08-10 | Offline isolation detection method for digital repeater |
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| CN201110227704.9A CN102932071B (en) | 2011-08-10 | 2011-08-10 | Offline isolation detection method for digital repeater |
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| CN108390702A (en) * | 2017-12-28 | 2018-08-10 | 三维通信股份有限公司 | A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band |
| CN109194419B (en) * | 2018-09-11 | 2020-08-28 | 京信通信系统（中国）有限公司 | Station opening method and device, electronic equipment and storage medium |
| CN111162850B (en) * | 2019-12-27 | 2022-03-01 | 京信网络系统股份有限公司 | Isolation degree processing method, device, equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1368828A (en) * | 2002-03-12 | 2002-09-11 | 武汉邮电科学研究院 | Automatic measuring technique for antenna isolating level of direct amplifying station with antenna transmission |
| CN1852059A (en) * | 2006-05-22 | 2006-10-25 | 京信通信技术(广州)有限公司 | Free-space optical transmission mobile communication digital peater |
| CN101615958A (en) * | 2008-06-27 | 2009-12-30 | 京信通信系统（中国）有限公司 | The method for detecting isolation between antennas of digital radio repeater system |
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| RU2425468C2 (en) * | 2006-10-31 | 2011-07-27 | Квэлкомм Инкорпорейтед | Controlling inter-cell power when sharing fractional frequency |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1368828A (en) * | 2002-03-12 | 2002-09-11 | 武汉邮电科学研究院 | Automatic measuring technique for antenna isolating level of direct amplifying station with antenna transmission |
| CN1852059A (en) * | 2006-05-22 | 2006-10-25 | 京信通信技术(广州)有限公司 | Free-space optical transmission mobile communication digital peater |
| CN101615958A (en) * | 2008-06-27 | 2009-12-30 | 京信通信系统（中国）有限公司 | The method for detecting isolation between antennas of digital radio repeater system |
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