CN117856932A - Isolation detection method and system - Google Patents

Abstract

The invention discloses a method and a system for detecting isolation, wherein the method comprises the following steps: the output power of the link to be detected has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the link to be detected; according to the dichotomy, finding critical output power which causes self-excitation of the link to be detected in the adjustment range of the output power, wherein the critical output power is the isolation degree of the link to be detected; the method can avoid self-excitation erroneous judgment caused by the space interference signal and influence the isolation detection result; the link gain is not required to be slowly set according to the minimum step, and the approximation is performed by adopting a dichotomy, so that the speed is high.

Description

Isolation detection method and system

Technical Field

The invention relates to the technical field of communication, in particular to a method and a system for detecting isolation.

Background

The isolation is an important parameter for measuring the communication quality, and too small isolation can cause interference to the communication system and even cause self-excitation phenomenon of the communication system, so that the repeater can be burnt out, and meanwhile, interference to the base station is caused, so that large-area users cannot normally communicate, and the communication quality is seriously affected. The isolation depends on the positions of the donor antenna and the retransmission antenna, and is also related to parameters such as azimuth angle of the antenna, front-to-back ratio and the like. In a practical site installation, isolation between the donor antenna to the BTS port and the MS port to the retransmission antenna is measured by using a signal source, a spectrum analyzer, and a power amplifier. When the method is used for testing, the signal source and the spectrum analyzer belong to high-precision instruments, so that the method is inconvenient to use in the field, and the other method is established in theoretical calculation, but the actual environment influences the isolation degree of the receiving and transmitting antenna due to reflection and absorption of surrounding buildings due to weather change, so that the difference between the signal source and the spectrum analyzer and the actual value is larger.

Disclosure of Invention

The embodiment of the invention aims to provide a detection method and a detection system for isolation, which are used for solving the problems that the detection result is influenced by weather change or the detection cost is high and the speed is low in the existing detection method for the isolation.

The embodiment of the invention provides a method for detecting isolation, which comprises the following steps:

the output power of the link to be detected has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the link to be detected;

and finding critical output power causing self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation degree of the link to be detected.

Optionally, the method is applied to a repeater, the output power of the to-be-detected link has a low threshold and a high threshold, and the setting of the adjustment range of the output power according to the preset parameter of the to-be-detected link includes:

opening a downlink, closing an uplink, wherein the output power of the downlink has a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the downlink.

Optionally, the finding the critical output power that causes the self-excitation of the link to be detected in the adjustment range of the output power according to the dichotomy, where the critical output power is the isolation of the link to be detected includes:

detecting real-time output power and judging whether the real-time output power is higher than a low threshold;

when the real-time output power is higher than a low threshold, judging whether the real-time output power is higher than Gao Menxian;

when the real-time output power is higher than a high threshold, the downlink self-excitation is performed, the attenuation value of the output power is increased by half of an attenuation adjustment range, the adjustment range is halved, and whether the attenuation adjustment range is smaller than or equal to a step is judged;

when the attenuation adjustment range is smaller than or equal to the step, recording the current attenuation value, and calculating the link gain, namely the isolation.

Optionally, when the real-time output power is higher than a high threshold, the downlink self-excitation is performed, so that the attenuation value of the output power is increased by half of an attenuation adjustment range, the adjustment range is halved, whether the attenuation adjustment range is smaller than or equal to a step is judged, when the attenuation adjustment range is smaller than or equal to the step, the current attenuation value is recorded, and after the link gain is calculated, the link gain is the isolation, the method further includes:

when the real-time output power is lower than a high threshold, reducing the attenuation value of the output power by half of an attenuation adjustment range, reducing the adjustment range by half, and judging whether the attenuation adjustment range is smaller than or equal to a step;

when the attenuation adjustment range is smaller than or equal to the step, recording the current attenuation value, and calculating the link gain, namely the isolation.

Optionally, after detecting the real-time output power and determining whether the real-time output power is higher than the low threshold, the method includes:

if the real-time output power is lower than the low threshold, judging that the isolation is large enough, and ending the isolation detection without performing gain adjustment of the link to be detected.

A system for detecting isolation, the system comprising:

the power setting module is used for setting the adjustment range of the output power according to the preset parameters of the link to be detected, wherein the output power of the link to be detected has a low threshold and a high threshold;

and the isolation detection module is used for finding out critical output power which causes self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation of the link to be detected.

Optionally, the power setting module is applied to a repeater, and includes:

and the downlink setting submodule is used for opening a downlink and closing an uplink, the output power of the downlink has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the downlink.

Optionally, the isolation detection module includes:

the low threshold value judging sub-module is used for detecting real-time output power and judging whether the real-time output power is higher than a low threshold or not;

the high threshold value judging sub-module is used for judging whether the real-time output power is higher than Gao Menxian when the real-time output power is higher than a low threshold;

the step value judging sub-module is used for enabling the downlink self-excitation to enable the attenuation value of the output power to be added with half of the attenuation adjustment range when the real-time output power is higher than a high threshold, halving the adjustment range and judging whether the attenuation adjustment range is smaller than or equal to a step;

and the isolation degree calculating submodule is used for recording the current attenuation value and calculating the link gain to obtain the isolation degree when the attenuation adjustment range is smaller than or equal to the step.

Optionally, the system further comprises:

the step value judging module is used for reducing the attenuation value of the output power by half of the attenuation adjustment range when the real-time output power is lower than a high threshold, reducing the adjustment range by half, and judging whether the attenuation adjustment range is smaller than or equal to a step;

and the attenuation value recording and calculating module is used for recording the current attenuation value and calculating the link gain, namely the isolation degree, when the attenuation adjustment range is smaller than or equal to the step.

Optionally, the system comprises:

and the isolation detection ending module is used for judging that the isolation is large enough if the real-time output power is lower than the low threshold, and ending the isolation detection without performing gain adjustment of the link to be detected.

Compared with the prior art, the beneficial effects of the embodiment of the invention comprise at least the following points:

a detection method and system of isolation, the method includes: the output power of the link to be detected has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the link to be detected; and finding critical output power causing self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation degree of the link to be detected. The method can avoid self-excitation erroneous judgment caused by the space interference signal and influence the isolation detection result; the link gain is not required to be slowly set according to the minimum step, and the approximation is performed by adopting a dichotomy, so that the speed is high.

Drawings

In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart illustrating a method for detecting isolation according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a method for detecting isolation applied to a repeater according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a low cost isolation detection device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an isolation detection system according to an embodiment of the invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present invention, it should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. The terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the particular meaning of the terms described above in the present invention will be understood to those of ordinary skill in the art in the detailed description of the invention.

The micropower distributed system can effectively solve the problem of signal interference in a transmission link and is applied more and more widely.

In the prior art, the isolation detection mode is to couple a fixed signal to a transmitting antenna end, detect signal power after isolation of a transmitting antenna and a receiving antenna, and calculate the isolation, but the scheme needs to increase a frequency synthesizer, if the isolation is larger, an amplifier needs to be added beyond the detection range of a detection tube, the circuit is complex, the dynamic range of the isolation detection is limited by the detection tube, and the cost is high;

in order to solve the problem of the method, similar to the first method, the transmission and detection signals can be coupled in the middle of the link, the cost of multiplexing the amplifier in the link is reduced, but the isolation between the transmission signal coupling port and the detection signal coupling port in the radio frequency link must be ensured to be large enough, otherwise, the isolation detection result is affected, so the method is used in digital repeater equipment and is not applicable to an analog repeater; in order to solve all the problems, the link gain is adjusted from low to high until the link self-excitation is detected, and the link gain at the moment is the isolation of the receiving and transmitting antenna, but the method has the limitation that if the isolation is smaller than the preset initial gain, the link attenuation can not be continuously detected, and the link attenuation needs to be slowly released according to the steps, so that the detection speed is low. Therefore, how to perform isolation detection quickly and at low cost in an analog system becomes a difficulty.

Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for detecting isolation according to the present invention, which specifically includes the following steps:

step 101, setting an adjustment range of output power of a link to be detected according to preset parameters of the link to be detected, wherein the output power of the link to be detected has a low threshold and a high threshold;

in an embodiment of the present application, the step 101 is applied to a repeater, and includes:

opening a downlink, closing an uplink, wherein the output power of the downlink has a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the downlink.

Step 102, finding critical output power causing self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation degree of the link to be detected.

Compared with the prior art, the application has the following advantages: the high threshold and the low threshold are set, so that the influence on the isolation detection result caused by self-excitation erroneous judgment generated by the space interference signal can be avoided; the link gain is not required to be slowly set according to the minimum stepping, and the approximation is performed by adopting a dichotomy method, so that the speed is high; all modules in the device can multiplex universal modules in a link without additionally adding a signal sending module and a detection module, so that the cost is low; the absolute value of the received power is not required to be compared with the transmitted signal, the limitation of the detection dynamic range of the detection module is avoided, and the detection dynamic range is large; the method is applicable to an analog system without considering whether the isolation between the signal sending module and the detection module is enough.

In an embodiment of the present application, the step 102 includes:

s11, detecting real-time output power and judging whether the real-time output power is higher than a low threshold;

in an embodiment of the present application, after the substep S11, the method includes:

and step S111, if the real-time output power is lower than the low threshold, judging that the isolation is large enough, and ending the isolation detection without performing gain adjustment of the link to be detected.

A substep S12, when the real-time output power is higher than a low threshold, determining whether the real-time output power is higher than Gao Menxian;

in an embodiment of the present application, the substep S12 further includes:

sub-step S121, when the real-time output power is lower than a high threshold, reducing the attenuation value of the output power by half of an attenuation adjustment range, reducing the adjustment range by half, and judging whether the attenuation adjustment range is smaller than or equal to a step;

and step S122, when the attenuation adjustment range is smaller than or equal to the step, recording the current attenuation value, and calculating the link gain, namely the isolation.

Step S13, when the real-time output power is higher than a high threshold, the downlink self-excitation is performed, the attenuation value of the output power is increased by half of an attenuation adjustment range, the adjustment range is halved, and whether the attenuation adjustment range is smaller than or equal to a step is judged;

and S14, recording the current attenuation value when the attenuation adjustment range is smaller than or equal to the step, and calculating the link gain, namely the isolation.

In one embodiment, a low threshold and a high threshold of output power are preset, link gain is set as a nominal maximum gain, and an attenuation adjustment range is recorded; the low threshold is used for eliminating self-excitation erroneous judgment caused by overlarge output power due to the space signal; the high threshold is used for judging whether self-excitation exists or not, and the high threshold is also used for protecting the downlink power amplifier and avoiding damage to devices caused by self-excitation. Only the downlink is turned on and the uplink remains off; judging whether the output power is lower than a low threshold; if the output power is lower than the low threshold, judging that the isolation is large enough, and ending the isolation detection without adjusting the link gain; judging whether the output power exceeds a high threshold; if the output power exceeds the high threshold, judging link self-excitation, adding one half of an attenuation adjustment range to an attenuation value, and reducing link gain; if the output power is lower than the high threshold, subtracting half of the attenuation adjustment range from the attenuation value; the attenuation adjustment range is halved; judging whether the attenuation adjustment range is smaller than or equal to the minimum step; if the attenuation adjustment range is smaller than or equal to the minimum step, recording the current attenuation value, calculating the link gain, namely the isolation, and ending the isolation detection.

In the application, a method and a system for detecting isolation, the method includes: setting an adjustment range of the output power according to preset parameters of the link to be detected through the fact that the output power of the link to be detected has a low threshold and a high threshold; and finding critical output power causing self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation degree of the link to be detected. The method for detecting the isolation degree with 1 and low cost is realized, the target attenuation approximation is rapidly carried out, and the detection range is not limited by the dynamic range of the detection device; 2. the low-cost isolation detection implementation method can avoid erroneous judgment caused by space interference signals by setting a high threshold and a low threshold, and can protect devices; 3. the low-cost isolation detection device structure is characterized in that a general hardware module in a multiplexing link is not required to be added with other modules, the cost is low, the isolation between a transmitting signal port and a detecting signal port is not required to be considered, and the device is particularly suitable for an analog system.

In order to achieve the above objective, as shown in fig. 2, the present application provides a specific embodiment of a low-cost isolation detection method applied to a repeater, which performs the following steps:

step one, presetting a low threshold and a high threshold of output power, setting a link gain as a nominal maximum gain, and recording an attenuation adjustment range;

step two, only opening the downlink, and keeping the uplink closed;

detecting output power, if the output power is lower than a low threshold, judging that the isolation is large enough, and ending the isolation detection without adjusting link gain;

judging whether the output power exceeds a high threshold, if so, judging link self-excitation, adding one half of an attenuation value to an attenuation adjustment range, reducing link gain, and reducing the attenuation adjustment range by one half; if not, reducing the attenuation value by half of the attenuation adjustment range, and then reducing the attenuation adjustment range by half;

step five, judging whether the attenuation adjustment range is smaller than or equal to the step, if so, recording the current attenuation value, calculating the link gain, namely the isolation, and ending the isolation detection; if not, repeating the fourth step.

Meanwhile, as shown in fig. 3, the present application provides a structural schematic diagram of a low-cost isolation detection device, which includes a control module for controlling a link switch, deciding a statistical result, and sending a gain adjustment instruction; a power detection module for detecting output power; and the variable gain module is used for carrying out link gain adjustment.

The control module is used for controlling a link switch, setting a high threshold and a low threshold, comparing output power with the threshold, sending an attenuation adjustment instruction according to the result, recording an attenuation adjustment range and calculating link gain.

The variable gain module is used for attenuating the link gain according to the attenuation adjustment instruction.

The power detection module is used for detecting output power.

In one embodiment, a low cost isolation detection device is provided as shown in fig. 2, comprising:

a control module 201, configured to set a high threshold, a low threshold, and a link switch; the control module receives the signal output by the power detection module; the control module is also used for comparing the output power with the high-low threshold and sending an attenuation adjustment instruction according to the comparison result; the control module is also used for recording and calculating the attenuation adjustment range and calculating the link gain according to the attenuation value.

And the variable gain module 202 is configured to receive the attenuation adjustment instruction sent by the control module, and perform link attenuation value adjustment.

The power detection module 203 is configured to couple the output power in the radio frequency link, detect the output power, and send the power detection result to the control unit. The power detection module can be realized by an ALC functional module in a multiplexing link without additional addition.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an isolation detection system according to the present invention, the system includes:

the power setting module 401 is configured to set an adjustment range of the output power according to a preset parameter of the link to be detected, where the output power of the link to be detected has a low threshold and a high threshold;

and the isolation detection module 402 is configured to find a critical output power that causes self-excitation of the link to be detected within the adjustment range of the output power according to a dichotomy, where the critical output power is an isolation of the link to be detected.

In an embodiment of the present application, the power setting module 401 is applied to a repeater, and includes:

a downlink setting submodule 4011 is configured to open a downlink and close an uplink, where output power of the downlink has a low threshold and a high threshold, and set an adjustment range of the output power according to a preset parameter of the downlink.

In an embodiment of the present application, the isolation detection module 402 includes:

the low threshold value judging sub-module 4021 is configured to detect real-time output power, and judge whether the real-time output power is higher than a low threshold;

a high threshold value judging submodule 4022, configured to judge whether the real-time output power is higher than Gao Menxian when the real-time output power is higher than a low threshold;

a step value judging submodule 4023, configured to, when the real-time output power is higher than a high threshold, self-excite the downlink to make the attenuation value of the output power add half of an attenuation adjustment range, halve the adjustment range, and judge whether the attenuation adjustment range is smaller than or equal to a step;

the isolation calculating submodule 4024 is configured to record a current attenuation value when the attenuation adjustment range is smaller than or equal to a step, and calculate a link gain, that is, the isolation.

In an embodiment of the present application, the system further includes:

a less-than-step value judging module 403, configured to, when the real-time output power is lower than a high threshold, reduce the attenuation value of the output power by half of an attenuation adjustment range, reduce the adjustment range by half, and judge whether the attenuation adjustment range is less than or equal to a step;

the attenuation value recording and calculating module 404 is configured to record the current attenuation value and calculate the link gain, that is, the isolation, when the attenuation adjustment range is less than or equal to the step.

In one embodiment of the present application, the system includes:

and the isolation detection ending module 405 is configured to judge that the isolation is large enough if the real-time output power is lower than the low threshold, and end the isolation detection without performing gain adjustment of the link to be detected.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (10)

1. The method for detecting the isolation is characterized by comprising the following steps:

the output power of the link to be detected has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the link to be detected;

and finding critical output power causing self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation degree of the link to be detected.

2. The method for detecting isolation according to claim 1, wherein the output power of the to-be-detected link has a low threshold and a high threshold, and the setting the adjustment range of the output power according to the preset parameter of the to-be-detected link includes:

opening a downlink, closing an uplink, wherein the output power of the downlink has a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the downlink.

3. The method for detecting the isolation according to claim 2, wherein the finding, according to the dichotomy, a critical output power that causes the self-excitation of the link to be detected within the adjustment range of the output power, the critical output power being the isolation of the link to be detected, includes:

detecting real-time output power and judging whether the real-time output power is higher than a low threshold;

when the real-time output power is higher than a low threshold, judging whether the real-time output power is higher than Gao Menxian;

when the real-time output power is higher than a high threshold, the downlink self-excitation is performed, the attenuation value of the output power is increased by half of an attenuation adjustment range, the adjustment range is halved, and whether the attenuation adjustment range is smaller than or equal to a step is judged;

when the attenuation adjustment range is smaller than or equal to the step, recording the current attenuation value, and calculating the link gain, namely the isolation.

4. The method for detecting isolation according to claim 3, wherein when the real-time output power is higher than a high threshold, the step of performing the downlink self-excitation, adding half of an attenuation adjustment range to an attenuation value of the output power, halving the adjustment range, determining whether the attenuation adjustment range is smaller than or equal to a step, recording a current attenuation value when the attenuation adjustment range is smaller than or equal to the step, and calculating a link gain, namely, after the isolation, further comprises:

when the real-time output power is lower than a high threshold, reducing the attenuation value of the output power by half of an attenuation adjustment range, reducing the adjustment range by half, and judging whether the attenuation adjustment range is smaller than or equal to a step;

when the attenuation adjustment range is smaller than or equal to the step, recording the current attenuation value, and calculating the link gain, namely the isolation.

5. The method for detecting isolation according to claim 3, wherein the detecting the real-time output power and determining whether the real-time output power is higher than a low threshold comprises:

if the real-time output power is lower than the low threshold, judging that the isolation is large enough, and ending the isolation detection without performing gain adjustment of the link to be detected.

6. A system for detecting isolation, the system comprising:

the power setting module is used for setting the adjustment range of the output power according to the preset parameters of the link to be detected, wherein the output power of the link to be detected has a low threshold and a high threshold;

and the isolation detection module is used for finding out critical output power which causes self-excitation of the link to be detected in the adjustment range of the output power according to a dichotomy, wherein the critical output power is the isolation of the link to be detected.

7. The isolation detection system according to claim 6, wherein the power setting module is applied to a repeater, and comprises:

and the downlink setting submodule is used for opening a downlink and closing an uplink, the output power of the downlink has a low threshold and a high threshold, and the adjustment range of the output power is set according to the preset parameters of the downlink.

8. The isolation detection system of claim 7, wherein the isolation detection module comprises:

the low threshold value judging sub-module is used for detecting real-time output power and judging whether the real-time output power is higher than a low threshold or not;

the high threshold value judging sub-module is used for judging whether the real-time output power is higher than Gao Menxian when the real-time output power is higher than a low threshold;

the step value judging sub-module is used for enabling the downlink self-excitation to enable the attenuation value of the output power to be added with half of the attenuation adjustment range when the real-time output power is higher than a high threshold, halving the adjustment range and judging whether the attenuation adjustment range is smaller than or equal to a step;

and the isolation degree calculating submodule is used for recording the current attenuation value and calculating the link gain to obtain the isolation degree when the attenuation adjustment range is smaller than or equal to the step.

9. The isolation detection system of claim 8, wherein the system further comprises:

the step value judging module is used for reducing the attenuation value of the output power by half of the attenuation adjustment range when the real-time output power is lower than a high threshold, reducing the adjustment range by half, and judging whether the attenuation adjustment range is smaller than or equal to a step;

and the attenuation value recording and calculating module is used for recording the current attenuation value and calculating the link gain, namely the isolation degree, when the attenuation adjustment range is smaller than or equal to the step.

10. The isolation detection system of claim 8, wherein the system comprises:

and the isolation detection ending module is used for judging that the isolation is large enough if the real-time output power is lower than the low threshold, and ending the isolation detection without performing gain adjustment of the link to be detected.