CN101615958B - Method for detecting isolation between antennas for digital radio repeater system - Google Patents

Method for detecting isolation between antennas for digital radio repeater system Download PDF

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Publication number
CN101615958B
CN101615958B CN 200810029056 CN200810029056A CN101615958B CN 101615958 B CN101615958 B CN 101615958B CN 200810029056 CN200810029056 CN 200810029056 CN 200810029056 A CN200810029056 A CN 200810029056A CN 101615958 B CN101615958 B CN 101615958B
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China
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digital
repeater
signal
digital radio
frequency
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CN 200810029056
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Chinese (zh)
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CN101615958A (en
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赵建平
刘志敏
伍尚坤
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京信通信系统(中国)有限公司
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Abstract

The invention provides a method for detecting isolation between antennas for a digital radio repeater system, which comprises the following steps that: a downlink digital processing unit (103) automatically utilizes an idle channel to search idle frequency points; an FPGA (1034) of the downlink digital processing unit (103) produces a dot frequency signal X; the X is transformed into an analog intermediate-frequency signal through DUC digital upconversion and D/A conversion; the analog intermediate-frequency signal enters the downlink digital processing unit (103) through a downlink upconversion module (104), an AMP (105), a duplexer (302), a retransmission antenna (402), a donor antenna (401), a duplexer (301), an LNA (101), and a down-conversion module (102) becomes the analog intermediate- frequency signal and enters the downlink digital processing unit (103); and the analog intermediate-frequency signal is transformed into a digital baseband signal Y through A/D conversion and DDC, the Y is equal to X+G-IL, G is system gain, and IL is the isolation between the donor antenna (401) and the retransmission antenna (402).

Description

The method for detecting isolation between antennas of digital radio repeater system
Technical field
The present invention relates to the digital radio repeater system design field, specifically be meant the method for detecting isolation between antennas of digital radio repeater system.
Background technology
Along with the professional rapid growth of mobile communication, there is active demand in operator to the lifting of brand effect separately, and the corresponding network quality requirement is also improving.Now each underground shelter, rural area, highway, railway, etc. construction project expansion just like a raging fire.Wireless discharging-directly station (comprising digital radio repeater and artificial antenna repeater) has unlimited potentiality as effectively extending network coverage means.As shown in Figure 1, general digital radio repeater system can (but being not limited only to) comprise: up link, down link; Said down link is connected to form by duplexer (301), low noise amplifier LNA (101), down conversion module (102), digital processing element (103), up-conversion module (104), descending amplifier AMP (105), duplexer (302) successively; Said up link is connected to form by duplexer (302), low noise amplifier LNA (205), down conversion module (204), digital processing element (203), up-conversion module (202), upstream amplifier AMP (201), duplexer (301) successively; Said duplexer (301) is connected with base station signal (501) through donor antenna (401), and duplexer (302) is connected with cellphone subscriber (502) through retransmitting antenna (402).And this invention realizes the detection of isolation between antennas in down link according to the downlink power and the metastable condition that gains thereof.
As shown in Figure 2; In digital radio repeater system, said digital processing element can comprise (but being not limited only to) A/D converter (1031), DDC Digital Down Convert passage (1032), digital filtering module (1033), FPGA (1034), DUC Digital Up Convert passage (1035), D/A converter (1036).Wherein the effect of A/D converter (1031) be with analog signal be transformed to digital signal, DDC Digital Down Convert passage (1032) to this digital signal be down-converted to digital baseband signal, digital filtering module (1033) carries out LPF to signal; FPGA (1034) processing base band signals; Signal is after DUC Digital Up Convert passage (1035) up-conversion, through D/A converter (1036) output analog signal then.
But in the process that wireless discharging-directly station is opened and moved, a key factor need considering when the isolation of antenna is system and project installation.If the isolation between donor antenna and the retransmitting antenna is less than the requirement (general wireless system requires: the isolation between donor antenna and the retransmitting antenna is than gaining greater than 15dB) of system; Then can cause system signal distortion, power dissipation, decreased performance, can cause system's self-excitation when serious, cause the damage of equipment, the covering of the whole network of influence.In application of practical project, the influence that is subject to environment, weather and surrounding building owing to donor antenna and retransmitting antenna makes isolation produce certain variation, so the isolation of antenna detects and becomes particularly important in digital radio repeater.
Method for the wireless discharging-directly station isolation degree test; Generally there are three kinds: as shown in Figure 3; A kind of is at donor antenna and the retransmitting antenna two ends respectively connect a signal source and a frequency spectrograph carries out the test of isolation between antennas; But this generally is when opening the station or the engineering staff makes in this way when on-the-spot, because signal source all be somewhat expensive with frequency spectrograph and move inconvenient equipment, so this has brought some difficulties to the wireless discharging-directly station isolation degree test; Another kind method is to be with a signal source and a frequency spectrograph to test isolation in inside, repeater, the interference that this can increase the cost of equipment undoubtedly and cause signal; The third is to synthesize through radio frequency detection, signal, increase the detection that control circuit reaches isolation between antennas, but this method can increase cost, and the precision that detects is not high yet.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art; The method for detecting isolation between antennas of digital radio repeater system is provided; This method is utilized the principle of software radio, according to the downlink power of digital radio repeater and the metastable condition that gains thereof, in down link, realizes the detection of isolation between antennas; System is workable, and monitoring accuracy is high, need not increase any hardware cost.
The object of the invention is realized through following proposal: the method for detecting isolation between antennas of this digital radio repeater system, and its step comprises:
(1) in down link digital processing element (103) lining, select an idle DDC passage to do and detect use, in bandwidth range, change the down-conversion frequency of this DDC passage from low to high;
(2) add up the digital power of this DDC passage, make an uproar the end of with and compare, if said digital power makes an uproar the end of near, be-80~-90dBm, just think that current frequency leaves unused, continue to seek idle frequency otherwise return step (1);
(3) in down link digital processing element (103) lining, use an idle DUC passage, corresponding the frequency of this DUC and this DDC passage;
(4) the FPGA (1034) of down link digital processing element (103) produce one-20~-the point-frequency signal X of 30dBm, it is arrowband or direct current signal, the watt level of this point-frequency signal X is decided by the power of used repeater and the gain of system;
(5) the point-frequency signal X that produced of said FPGA (1034) carries out Digital Up Convert through DUC Digital Up Convert passage (1035), carries out D/A converter (1036) then digital signal is become analog if signal;
(6) analog if signal becomes analog if signal entering down link digital processing element (103) through descending up-conversion module (104), descending amplifier (105), duplexer (302), retransmitting antenna (402), donor antenna (401), duplexer (301), low noise amplifier (101), down conversion module (102);
(7) after analog if signal gets into down link digital processing element (103); Become digital medium-frequency signal through A/D converter (1031); Become digital baseband signal Y through DDC Digital Down Convert passage (1032) then; Y=X+G-IL, wherein G is that system gain, IL are the isolation between donor antenna (401) and the retransmitting antenna (402), the isolation of repeater is IL=G+X-Y just.
For realizing the present invention better, the concrete realization hardware of said down link digital processing element (103) and framework can have multiple, like FPGA, and CPLD, DSP etc.
Said above-mentioned idle DDC passage and idle DUC passage can be the fixing passages of using for test, also can be the idle channels when night, telephone traffic was few.
The standard of said digital radio repeater system can be GSM, CDMA, and WCDMA, or other mixes standard etc.
Said digital radio repeater can be that digital radio carrier wave repeater, digital radio broad band repeater, digital radio carrier wave frequency selecting repeater, digital radio frequency-shift repeater, digital radio self-excitation offset repeater and other digital radio repeaters.
The method for detecting isolation between antennas of this digital radio repeater system compared with prior art has the following advantages and beneficial effect:
(1) comparatively advanced software radio theory is adopted in the design of complete machine, and simplicity of design under the situation that does not increase hardware, can realize isolation degree test flexibly, can practice thrift cost to greatest extent;
(2) possess digital processing element, signal is carried out effective processing capacity at numeric field;
When (3) detecting isolation, utilize idle frequency range, can not influence the signal of normal communication;
(4) effectively avoided the artificial antenna repeater to come observation line isolation, greatly reduced the cost of equipment through increasing built-in signal source and frequency spectrograph.
The method of (4) utilization numeral is carried out the detection of isolation, has optimized detection means and has improved the precision that detects;
(5) this system not only is applicable to digital radio carrier wave repeater, also is applicable to the repeater in digital radio broadband simultaneously, and in other digital radio repeater.
Description of drawings
Fig. 1 is the structure principle chart of existing digital radio repeater system;
Fig. 2 is a down link baseband processing unit internal structure schematic diagram shown in Figure 1;
Fig. 3 is that existing simulation antenna isolating level of direct amplifying station with antenna detects sketch map;
Fig. 4 is the isolation between antennas testing process sketch map of digital radio repeater system of the present invention;
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but execution mode of the present invention is not limited thereto.
Embodiment one
As shown in Figure 1, adopt existing digital radio repeater system, direct discharging station is a wireless carrier frequency selecting repeater system, comprising: up link, down link; Said down link is connected to form by duplexer (301), low noise amplifier LNA (101), down conversion module (102), digital processing element (103), up-conversion module (104), descending amplifier AMP (105), duplexer (302) successively; Said up link is connected to form by duplexer (302), low noise amplifier LNA (205), down conversion module (204), digital processing element (203), up-conversion module (202), upstream amplifier AMP (201), duplexer (301) successively; Said duplexer (301) is connected with base station signal (501) through donor antenna (401), and duplexer (302) is connected with cellphone subscriber (502) through retransmitting antenna (402).
As shown in Figure 2, down link digital processing element (103) comprises A/D converter (1031), DDC Digital Down Convert passage (1032), digital filtering module (1033) (the main effect of said digital filtering module is outer spuious, the raising carrier selecting property of filtering band), FPGA (1034), DUC Digital Up Convert passage (1035), the D/A converter (1036) that connects successively.
As shown in Figure 4; It is such that this GSM digital radio repeater system carries out isolation between antennas testing process: in the down link digital processing element; Select an idle DDC passage to do and detect use, in bandwidth range, change the down-conversion frequency of this DDC passage from low to high; Add up the digital power of this DDC passage, make an uproar the end of with and compare, if said digital power near the end make an uproar (be-80~-90dBm) just think that current frequency leaves unused; In the down link digital processing element, use an idle DUC passage, corresponding the frequency of this DUC and this DDC passage.
In down link digital processing element (103) lining; Produce a suitable point-frequency signal X through FPGA (1034); It is arrowband or direct current signal, and the watt level of this point-frequency signal is decided by the power of used repeater and the gain of system, can be taken as-20~-30dBm; This signal X carries out Digital Up Convert through DUC (1035); Through D/A converter (1036) digital signal is become analog if signal then, analog if signal becomes analog if signal through descending up-conversion module (104), descending amplifier (105), duplexer (302), retransmitting antenna (402), donor antenna (401), duplexer (301), low noise amplifier (101), down conversion module (102) and gets into baseband processing unit (103).
After analog if signal gets into down link digital processing element (103); Become digital medium-frequency signal through A/D converter (1031); Become digital baseband signal Y (Y=X+G-IL, wherein G is that system gain, IL are the isolation between donor antenna and the retransmitting antenna) through DDC (1032) then.
The point-frequency signal X that this digital baseband signal Y and former FPGA produce compares and can draw: Δ=X-Y=X-(X+G-IL)=IL-G.According to system requirements: the isolation between donor antenna (401) and the retransmitting antenna (402) is than the big 15dB of gain; As long as, then detect system's isolation and meet the demands, if compare Δ<15dB so compare Δ >=15dB; Then detecting system's isolation does not meet the demands; At this moment direct amplifying station monitoring sends the isolation alarm, or reduces system gain automatically, to satisfy system requirements.
Said down link digital processing element (103) adopts FPGA, CPLD, DSP etc.
Said above-mentioned idle DDC passage can be the fixing passage of using for test with (1032) idle DUC passages (1035), also can be the idle channel when night, telephone traffic was few.
The standard of said digital radio repeater system can be GSM, CDMA, and WCDMA, or other mixes standard etc.
Said digital radio repeater can be that digital radio carrier wave repeater, digital radio broad band repeater, digital radio carrier wave frequency selecting repeater, digital radio frequency-shift repeater, digital radio self-excitation offset repeater and other digital radio repeaters.
Originally the introducing that has the GSM digital radio repeater system of isolation between antennas measuring ability can not cause bad influence to base station and this direct discharging station; Because FPGA can seek idle frequency earlier automatically before producing point-frequency signal X; Can not choose signal like this, when testing, can not produce and disturb useful signal in usefulness.
As stated, can realize preferably that just the present invention, the foregoing description are merely preferred embodiment of the present invention, be not to be used for limiting practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.

Claims (7)

1. the method for detecting isolation between antennas of digital radio repeater system is characterized in that may further comprise the steps:
(1) in down link digital processing element (103) lining, select an idle DDC passage to do and detect use, in bandwidth range, change the down-conversion frequency of this DDC passage from low to high;
(2) add up the digital power of this DDC passage, make an uproar the end of with and compare, if said digital power makes an uproar the end of near, be-80~-90dBm, just think that current frequency leaves unused, continue to seek idle frequency otherwise return step (1);
(3) in down link digital processing element (103) lining, use an idle DUC passage, corresponding the frequency of this DUC and this DDC passage;
(4) the FPGA (1034) of down link digital processing element (103) produce one-20~-the point-frequency signal X of 30dBm, it is arrowband or direct current signal, the watt level of this point-frequency signal X is decided by the power of used repeater and the gain of system;
(5) the point-frequency signal X that produced of said FPGA (1034) carries out Digital Up Convert through DUC Digital Up Convert passage (1035), carries out D/A converter (1036) then digital signal is become analog if signal;
(6) analog if signal becomes analog if signal entering down link digital processing element (103) through descending up-conversion module (104), descending amplifier (105), duplexer (302), retransmitting antenna (402), donor antenna (401), duplexer (301), low noise amplifier (101), down conversion module (102);
(7) after analog if signal gets into down link digital processing element (103); Become digital medium-frequency signal through A/D converter (1031); Become digital baseband signal Y through DDC Digital Down Convert passage (1032) then; Y=X+G-IL, wherein G is that system gain, IL are the isolation between donor antenna (401) and the retransmitting antenna (402), the isolation of repeater is IL=G+X-Y just.
2. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1, it is characterized in that: said down link digital processing element (103) adopts FPGA, CPLD, DSP.
3. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1; It is characterized in that: said above-mentioned idle DDC passage and idle DUC passage are the fixing passages of using for test, or the idle channel when night, telephone traffic was few.
4. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1, it is characterized in that: the standard of said digital radio repeater system comprises GSM, CDMA, WCDMA.
5. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1, it is characterized in that: said digital radio repeater comprises that digital radio carrier wave repeater, digital radio broad band repeater, digital radio carrier wave frequency selecting repeater, digital radio frequency-shift repeater, digital radio self-excitation offset the repeater.
6. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1, it is characterized in that: the said point-frequency signal X of step (4) is arrowband or direct current signal.
7. according to the method for detecting isolation between antennas of the said digital radio repeater system of claim 1, it is characterized in that: the watt level of the said point-frequency signal X of step (4) gets-20~-30dBm.
CN 200810029056 2008-06-27 2008-06-27 Method for detecting isolation between antennas for digital radio repeater system CN101615958B (en)

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CN101867423B (en) * 2010-06-22 2014-04-09 中兴通讯股份有限公司 Method and device for detecting spatial thermal noise at position of antenna
CN102315875A (en) * 2010-06-30 2012-01-11 段向胜 Transfer device used for enhancing wireless sensor signal
CN102932071B (en) * 2011-08-10 2015-02-11 京信通信系统(中国)有限公司 Offline isolation detection method for digital repeater
CN102761382A (en) * 2012-06-07 2012-10-31 哈尔滨海能达科技有限公司 Method, system and correlated device for determining isolation between antennae
CN103874111B (en) * 2012-12-18 2018-05-01 佳律通信设备(上海)有限公司 Direct discharging station adaptive optimization method based on isolation detection
CN103647590B (en) * 2013-11-21 2016-08-17 航天恒星科技有限公司 A kind of determination method of phased array antenna receive-transmit isolation
TWI601388B (en) * 2016-11-17 2017-10-01 翌勤通訊股份有限公司 Symmetric repeater and method for measuring antenna isolation
CN107453823B (en) * 2017-07-31 2021-02-02 武汉虹信科技发展有限责任公司 Single body test system and method for optical fiber distributed repeater

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