CN103812582A - Low-gain low-power repeater isolation detection method - Google Patents
Low-gain low-power repeater isolation detection method Download PDFInfo
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- CN103812582A CN103812582A CN201210454771.9A CN201210454771A CN103812582A CN 103812582 A CN103812582 A CN 103812582A CN 201210454771 A CN201210454771 A CN 201210454771A CN 103812582 A CN103812582 A CN 103812582A
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- link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a low-grain low-power repeater isolation detection method. A detection module for detecting link gain and power is arranged on an up link, a numerical control attenuator and a simulation attenuator are arranged on the detection module, the attenuator is adjusted to be matched with the link gain and the output power which are detected by the detection module to judge whether a device is in the self-excitation state, and meanwhile the isolation is calculated. Compared with the prior art, the up link with low power is selected to be detected during detection, the up link is not easy to damage, interference of manual factors is avoided during detection, and the detection accuracy is high.
Description
Technical field
The present invention relates to a kind of method for detecting isolation between, especially relate to the method for detecting isolation between of a kind of low gain low-power repeater.
Background technology
Isolation be the input port signal of repeater to the degree of decay between delivery outlet, be the ratio of power, unit is: dB.It depends on the position of donor antenna and retransmitting antenna, also with the azimuth of antenna, and the relating to parameters such as front and back ratio.In real site is installed, donor antenna to BTS port and MS port to the isolation between retransmitting antenna as shown in Figure 1, measure by employing signal source, spectrum analyzer, power amplifier by the mensuration of its isolation.In the time testing in this way, because signal source and spectrum analyzer belong to high-precision instrument, be not easy to use in the wild, another kind method is to be based upon theoretical calculating aspect, but actual environment can be because of the variation of weather, the reflection of Adjacent Buildings and absorption, affect the isolation of dual-mode antenna, thus can and actual Zhi Xiang missionary society larger.
Summary of the invention
Object of the present invention is exactly the method for detecting isolation between that a kind of low gain low-power repeater is provided in order to overcome the defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
The method for detecting isolation between of a kind of low gain low-power repeater, described repeater comprises up link and down link, up link and down link include duplexer, power amplifier, intermediate-frequency filter, local oscillation signal generator, AGC (Automatic Gain Control, automatic gain control) control circuit and low noise amplifier, be provided for detecting the testing circuit of link gain and power in described up link, this testing circuit is provided with numerical-control attenuator and analog attenuator, and described detection method comprises the following steps:
1) close the power amplifier of down link, the numerical-control attenuator that up link and down link are set is 31dB;
2) up AGC control circuit is adjusted into open circuit, AGC control circuit is stopped uplink gain control;
3) numerical-control attenuator of progressively adjusting up link is by 31dB to 0dB;
4) be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, testing circuit is judged in self-excitation state, the pad value of isolation=link gain-numerical-control attenuator; If output power value is unchanged, perform step 5);
5) decontrol the analog attenuation value of up link analog attenuator, and to be progressively adjusted to this analog attenuation value by the preset value of this analog attenuation value be 0dB;
6) be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, detection module is judged in self-excitation state, the analog attenuation value that isolation=link gain+analog attenuator is decontroled.
Step 3) and step 5) in adjust step value be 1dB.
Step 5) in the preset value of analog attenuation value be 12dB.
Compared with prior art, the present invention adopts up link to detect, because its merit power is less compared to down link, not fragile under self-excitation state, therefore can improve the reliability of detection, in addition AGC control circuit is adjusted into open circuit, after cancelling closed loop loop, detect again, at this moment carry out isolation detection, the isolation value measuring and actual isolation value differ and can not exceed 3dB, while doing isolation detection, need to, the shielding of AGC link, just can accomplish that accuracy is high.
Accompanying drawing explanation
Fig. 1 is the connection diagram of repeater and donor antenna, retransmitting antenna;
Fig. 2 is the detection architecture schematic diagram of repeater;
Fig. 3 is flow chart of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
General repeater comprises up link A and down link B, up link A and down link B include the equipment such as duplexer 1, power amplifier 2, intermediate-frequency filter 3, local oscillation signal generator 4, AGC control circuit 5 and low noise amplifier 6, method of the present invention is the testing circuit 7 that is provided for detecting link gain and power at up link A, as shown in Figure 2.This testing circuit is provided with numerical-control attenuator and analog attenuator, can be used for adjusting the pad value of link, and the flow process of this detection method as shown in Figure 3, specifically comprises the following steps:
Step 1: close the power amplifier of down link, the numerical-control attenuator that up link and down link are set is 31dB;
Step 2: up AGC control circuit is adjusted into open circuit, AGC control circuit is stopped uplink gain control;
Step 3: progressively adjust the numerical-control attenuator of up link by 31dB to 0dB, each step value of adjusting is 1dB;
Step 4: be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, testing circuit is judged in self-excitation state, the pad value of isolation=link gain-numerical-control attenuator; If output power value is unchanged, perform step 5);
Step 5: decontrol the analog attenuation value of up link analog attenuator, the preset value of this value is generally in 12dB left and right, and being then progressively adjusted to this analog attenuation value by 12dB is 0dB, and each step value of adjusting is 1dB;
Step 6: be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, detection module is judged in self-excitation state, the analog attenuation value that isolation=link gain+analog attenuator is decontroled.
Claims (3)
1. the method for detecting isolation between of a low gain low-power repeater, described repeater comprises up link and down link, up link and down link include duplexer, power amplifier, intermediate-frequency filter, local oscillation signal generator, AGC control circuit and low noise amplifier, it is characterized in that, be provided for detecting the testing circuit of link gain and power in described up link, this testing circuit is provided with numerical-control attenuator and analog attenuator, and described detection method comprises the following steps:
1) close the power amplifier of down link, the numerical-control attenuator that up link and down link are set is 31dB;
2) up AGC control circuit is adjusted into open circuit, AGC control circuit is stopped uplink gain control;
3) numerical-control attenuator of progressively adjusting up link is by 31dB to 0dB;
4) be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, testing circuit is judged in self-excitation state, the pad value of isolation=link gain-numerical-control attenuator; If output power value is unchanged, perform step 5);
5) decontrol the analog attenuation value of up link analog attenuator, and to be progressively adjusted to this analog attenuation value by the preset value of this analog attenuation value be 0dB;
6) be in course of adjustment and detect power output and the link gain of up link by testing circuit, if detect when output power value reaches maximum, detection module is judged in self-excitation state, the analog attenuation value that isolation=link gain+analog attenuator is decontroled.
2. the method for detecting isolation between of a kind of low gain low-power according to claim 1 repeater, is characterized in that step 3) and step 5) in adjust step value be 1dB.
3. the method for detecting isolation between of a kind of low gain low-power according to claim 1 repeater, is characterized in that step 5) in the preset value of analog attenuation value be 12dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210454771.9A CN103812582A (en) | 2012-11-13 | 2012-11-13 | Low-gain low-power repeater isolation detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210454771.9A CN103812582A (en) | 2012-11-13 | 2012-11-13 | Low-gain low-power repeater isolation detection method |
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| Publication Number | Publication Date |
|---|---|
| CN103812582A true CN103812582A (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210454771.9A Pending CN103812582A (en) | 2012-11-13 | 2012-11-13 | Low-gain low-power repeater isolation detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672480A (en) * | 2018-11-02 | 2019-04-23 | 京信通信系统（中国）有限公司 | Method for detecting isolation between, device, access unit, system and storage medium |
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2012
- 2012-11-13 CN CN201210454771.9A patent/CN103812582A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672480A (en) * | 2018-11-02 | 2019-04-23 | 京信通信系统（中国）有限公司 | Method for detecting isolation between, device, access unit, system and storage medium |
| CN109672480B (en) * | 2018-11-02 | 2022-03-25 | 京信网络系统股份有限公司 | Isolation detection method, device, access unit, system and storage medium |
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Application publication date: 20140521 |