A method and system for detecting isolation degree

Abstract

The present invention discloses a detection method and system for isolation degree, the method comprising: the output power of a link to be detected has a low threshold and a high threshold, and the adjustment range of the output power is set according to preset parameters of the link to be detected; according to the binary method, the critical output power that causes the self-excitation of the link to be detected is found within the adjustment range of the output power, and the critical output power is the isolation degree of the link to be detected; the self-excitation misjudgment caused by the spatial interference signal is avoided, which affects the isolation degree detection result; the link gain does not need to be set slowly according to the minimum step, and the binary method is used for approximation, which is fast.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and system for detecting isolation. Background Art

[0002] Isolation is an important parameter to measure the communication quality. If the isolation is too small, it will interfere with the communication system and even cause the communication system to self-excite, which will burn out the repeater and interfere with the base station, causing a large area of ​​users to be unable to communicate normally, seriously affecting the communication quality. Isolation depends on the position of the donor antenna and the repeater antenna, and is also related to the antenna's azimuth, front-to-back ratio and other parameters. In the actual site installation, the isolation between the donor antenna to the BTS port and the MS port to the repeater antenna is measured by using a signal source, spectrum analyzer, and power amplifier. When testing with this method, since the signal source and spectrum analyzer are high-precision instruments, they are not convenient for use in the field. Another method is based on theoretical calculations, but the actual environment will affect the isolation of the transceiver antenna due to changes in weather, reflection and absorption of surrounding buildings, so it will be quite different from the actual value. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide an isolation detection method and system to solve the problems of the existing isolation detection method, that is, the detection result may be affected by weather changes, or the detection cost is high and the speed is slow.

[0004] An embodiment of the present invention provides a method for detecting isolation, the method comprising:

[0005] 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;

[0006] According to the dichotomy method, a critical output power causing the link to be detected to self-excite is found within the adjustment range of the output power, and the critical output power is the isolation degree of the link to be detected.

[0007] Optionally, in a repeater, 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 preset parameters of the link to be detected, including:

[0008] The downlink is turned on and the uplink is turned off. The output power of the downlink has a low threshold and a high threshold. The adjustment range of the output power is set according to the preset parameters of the downlink.

[0009] Optionally, the step of finding, according to the dichotomy method, a critical output power causing the link to be detected to self-excite within the adjustment range of the output power, wherein the critical output power is the isolation degree of the link to be detected, includes:

[0010] Detecting the real-time output power, and determining whether the real-time output power is higher than a lower threshold;

[0011] When the real-time output power is higher than a lower threshold, determining whether the real-time output power is higher than a high threshold;

[0012] When the real-time output power is higher than the upper threshold, the downlink is self-excited, the attenuation value of the output power is added to half of the attenuation adjustment range, the adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step;

[0013] When the attenuation adjustment range is less than or equal to the step, the current attenuation value is recorded and the link gain is calculated, which is the isolation.

[0014] Optionally, when the real-time output power is higher than the high threshold, the downlink is self-excited, the attenuation value of the output power is added to half of the attenuation adjustment range, the adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step. When the attenuation adjustment range is less than or equal to the step, the current attenuation value is recorded, and the link gain is calculated, that is, the isolation degree, and further includes:

[0015] When the real-time output power is lower than the upper threshold, the attenuation value of the output power is reduced by half of the attenuation adjustment range, the adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step;

[0016] When the attenuation adjustment range is less than or equal to the step, the current attenuation value is recorded and the link gain is calculated, which is the isolation.

[0017] Optionally, the detecting the real-time output power and determining whether the real-time output power is higher than a lower threshold includes:

[0018] If the real-time output power is lower than the lower threshold, it is determined that the isolation is large enough, and there is no need to adjust the gain of the link to be detected, and the isolation detection is terminated.

[0019] A detection system for isolation degree, the system comprising:

[0020] A power setting module, which is used for setting the output power of the link to be detected to have a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the link to be detected;

[0021] The isolation detection module is used to find the critical output power that causes the link to be detected to self-excite within the adjustment range of the output power according to the dichotomy method, and the critical output power is the isolation of the link to be detected.

[0022] Optionally, applied to a repeater, the power setting module includes:

[0023] The downlink setting submodule is used to open the downlink and close the uplink. The output power of the downlink has a low threshold and a high threshold. The adjustment range of the output power is set according to the preset parameters of the downlink.

[0024] Optionally, the isolation detection module includes:

[0025] A low threshold value judgment submodule, used to detect the real-time output power and judge whether the real-time output power is higher than the low threshold;

[0026] A high threshold value judgment submodule, used for judging whether the real-time output power is higher than a high threshold when the real-time output power is higher than a low threshold;

[0027] A step value judgment submodule, used for, when the real-time output power is higher than the upper threshold, the downlink self-excites, adds the attenuation value of the output power to half of the attenuation adjustment range, halves the adjustment range, and judges whether the attenuation adjustment range is less than or equal to the step value;

[0028] The isolation calculation submodule is used to record the current attenuation value and calculate the link gain, namely the isolation, when the attenuation adjustment range is less than or equal to the step.

[0029] Optionally, the system further comprises:

[0030] A less than step value judgment module is used to reduce the attenuation value of the output power by half of the attenuation adjustment range when the real-time output power is lower than the upper threshold, halve the adjustment range, and judge whether the attenuation adjustment range is less than or equal to the step value;

[0031] The attenuation value recording and calculating module is used 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.

[0032] Optionally, the system comprises:

[0033] The isolation detection termination module is used to determine that the isolation is large enough if the real-time output power is lower than the lower threshold, and there is no need to adjust the gain of the link to be detected, thereby terminating the isolation detection.

[0034] Compared with the prior art, the beneficial effects of the embodiments of the present invention include at least the following points:

[0035] A method and system for detecting isolation, the method comprising: the output power of a 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 binary method, the critical output power that causes the self-excitation of the link to be detected is found within the adjustment range of the output power, and the critical output power is the isolation of the link to be detected. It is achieved that the self-excitation misjudgment caused by spatial interference signals can be avoided, which affects the isolation detection result; there is no need to slowly set the link gain according to the minimum step, and the binary method is used for approximation, which is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a flowchart of a method for detecting isolation degree according to an embodiment of the present invention;

[0038] Figure 2 It is a flow chart of the steps of an isolation detection method applied to a repeater station according to an embodiment of the present invention;

[0039] Figure 3 It is a structural schematic diagram of a low-cost isolation detection device according to an embodiment of the present invention;

[0040] Figure 4 The figure is a schematic diagram of the structure of an isolation detection system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the description of the present invention, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] Micro-power distributed systems can effectively solve the problem of signal interference in transmission links and are increasingly widely used.

[0046] In the prior art, the isolation detection method is to couple a fixed signal to the transmitting antenna end, detect the signal power after the transmitting antenna and the receiving antenna are isolated, and calculate the isolation. However, this solution requires the addition of a frequency synthesizer. If the isolation is large and exceeds the detection range of the detector tube, an amplifier needs to be added. The circuit is complex, the dynamic range of isolation detection is limited by the detector tube, and the cost is high.

[0047] In order to solve the problems of the above methods, similar to the first method, the transmission and detection signals can be coupled in the middle of the link, and the amplifiers in the link can be reused, which reduces the cost. However, the isolation between the transmission signal coupling port and the detection signal coupling port in the RF link must be large enough, otherwise it will affect the isolation detection result. Therefore, this method is mostly used in digital repeater equipment and is not applicable to analog repeaters. In order to solve all the problems, the link gain is adjusted from low to high until the link self-excitation is detected. The link gain at this time is the isolation of the transceiver antenna, but this method has limitations. If the isolation is less than the preset initial gain, the detection cannot continue, and the link attenuation needs to be slowly released in steps, and the detection speed is slow. Therefore, how to perform isolation detection in an analog system at low cost and quickly becomes a difficult point.

[0048] See also Figure 1 , Figure 1 It is a flow chart of the steps of a method for detecting isolation degree of the present invention, which specifically includes the following steps:

[0049] Step 101: 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;

[0050] In one embodiment of the present application, which is applied to a repeater, step 101 includes:

[0051] The downlink is turned on and the uplink is turned off. The output power of the downlink has a low threshold and a high threshold. The adjustment range of the output power is set according to the preset parameters of the downlink.

[0052] Step 102: According to the binary method, find the critical output power that causes the link to be detected to self-excite within the adjustment range of the output power, and the critical output power is the isolation degree of the link to be detected.

[0053] Compared with the prior art, the present application has the following advantages: two high and low thresholds are set, which can avoid self-excitation misjudgment caused by spatial interference signals and affect the isolation detection result; there is no need to slowly set the link gain according to the minimum step, and the binary method is used for approximation, which is fast; each module in the device can reuse the common module in the link, and there is no need to add additional signal sending modules and detection modules, which is low in cost; there is no need to detect the absolute value of the received power and compare it with the sent signal, it is not limited by the detection dynamic range of the detection module, and the detection dynamic range is large; there is no need to consider whether the isolation between the signal sending module and the detection module is sufficient, and it is suitable for analog systems.

[0054] In an embodiment of the present application, step 102 includes:

[0055] Sub-step S11, detecting the real-time output power, and determining whether the real-time output power is higher than a lower threshold;

[0056] In an embodiment of the present application, after the sub-step S11, the following steps are included:

[0057] Sub-step S111: if the real-time output power is lower than the lower threshold, it is determined that the isolation is large enough, and there is no need to adjust the gain of the link to be detected, and the isolation detection is ended.

[0058] Sub-step S12, when the real-time output power is higher than a lower threshold, determining whether the real-time output power is higher than a high threshold;

[0059] In an embodiment of the present application, the sub-step S12 further includes:

[0060] Sub-step S121, when the real-time output power is lower than the upper threshold, the attenuation value of the output power is reduced by half of the attenuation adjustment range, the adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step;

[0061] Sub-step S122, when the attenuation adjustment range is less than or equal to the step, record the current attenuation value and calculate the link gain, that is, the isolation.

[0062] Sub-step S13, when the real-time output power is higher than the upper threshold, the downlink is self-excited, the attenuation value of the output power is added to half of the attenuation adjustment range, the adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step;

[0063] Sub-step S14, when the attenuation adjustment range is less than or equal to the step, record the current attenuation value and calculate the link gain, that is, the isolation.

[0064] In one embodiment, the output power low threshold and high threshold are preset, the link gain is set to the nominal maximum gain, and the attenuation adjustment range is recorded; the low threshold is used to exclude the self-excitation misjudgment caused by excessive output power due to spatial signals; the high threshold is used to determine whether there is self-excitation, and the high threshold is also used to protect the downlink power amplifier to avoid damage to the device caused by self-excitation. Only the downlink link is turned on, and the uplink remains closed; it is determined whether the output power is lower than the low threshold; if the output power is lower than the low threshold, it is determined that the isolation is large enough, and no link gain adjustment is required, and the isolation detection is terminated; it is determined whether the output power exceeds the high threshold; if the output power exceeds the high threshold, it is determined that the link is self-excited, the attenuation value is added to half of the attenuation adjustment range, and the link gain is reduced; if the output power is lower than the high threshold, the attenuation value is reduced by half of the attenuation adjustment range; the attenuation adjustment range is halved; it is determined whether the attenuation adjustment range is less than or equal to the minimum step; if the attenuation adjustment range is less than or equal to the minimum step, the current attenuation value is recorded, the link gain is calculated, that is, the isolation, and the isolation detection is terminated.

[0065] In the present application, a method and system for detecting isolation degree is provided, and the method includes: the output power of the link to be detected has a low threshold and a high threshold, and according to the preset parameters of the link to be detected, the adjustment range of the output power is set; according to the dichotomy method, the critical output power that causes the self-excitation of the link to be detected is found within the adjustment range of the output power, and the critical output power is the isolation degree of the link to be detected. 1. A low-cost isolation degree detection implementation method is achieved, which can quickly approach the target attenuation, and the detection range is not limited by the dynamic range of the detection device; 2. A low-cost isolation degree detection implementation method can avoid misjudgment caused by spatial interference signals by setting high and low thresholds, and can protect the device; 3. A low-cost isolation degree detection device structure can reuse the common hardware modules in the link, without adding additional modules, low cost, and no need to consider the isolation between the sending signal port and the detection signal port, which is particularly suitable for analog systems.

[0066] To achieve the above purpose, Figure 2 The present application provides a specific implementation method of a low-cost isolation detection method applied in a repeater station, performing the following steps:

[0067] Step 1: preset the output power low threshold and high threshold, set the link gain to the nominal maximum gain, and record the attenuation adjustment range;

[0068] Step 2: Only the downlink is opened, and the uplink remains closed;

[0069] Step 3: Detect the output power. If the output power is lower than the lower threshold, it is determined that the isolation is large enough and no link gain adjustment is required, and the isolation detection ends.

[0070] Step 4: Determine whether the output power exceeds the upper threshold. If so, determine that the link is self-excited, increase the attenuation value by half of the attenuation adjustment range, reduce the link gain, and halve the attenuation adjustment range; if not, reduce the attenuation value by half of the attenuation adjustment range, and then halve the attenuation adjustment range;

[0071] Step 5: Determine whether the attenuation adjustment range is less than or equal to the step. If so, record the current attenuation value, calculate the link gain, which is the isolation, and end the isolation test; if not, repeat step 4.

[0072] At the same time, if Figure 3 The present application provides a structural schematic diagram of a low-cost isolation detection device, including a control module for controlling link switches, determining statistical results, and sending gain adjustment instructions; a power detection module for detecting output power; and a variable gain module for performing link gain adjustment.

[0073] The control module is used to control the link switch, set the high and low thresholds, compare the output power with the thresholds, send the attenuation adjustment instruction according to the result, record the attenuation adjustment range, and calculate the link gain.

[0074] The variable gain module is used to attenuate the link gain according to the attenuation adjustment instruction.

[0075] The power detection module is used to detect output power.

[0076] In one embodiment, a low-cost isolation detection device is provided. Figure 2 As shown, including:

[0077] The control module 201 is used to set the upper threshold, the lower threshold and the link switch; the control module receives the signal output by the power detection module; the control module is also used to compare the output power with the upper and lower thresholds, and to send an attenuation adjustment instruction according to the comparison result; the control module is also used to record and calculate the attenuation adjustment range, and calculate the link gain according to the attenuation value.

[0078] The variable gain module 202 is used to receive the attenuation adjustment instruction sent by the control module and adjust the link attenuation value.

[0079] The power detection module 203 is used to couple the output power in the radio frequency link, perform detection, and send the power detection result to the control unit. The power detection module can be implemented by reusing the ALC function module in the link without adding any additional modules.

[0080] See also Figure 4 , Figure 4 1 is a schematic diagram of the structure of an isolation detection system of the present invention, the system comprising:

[0081] The power setting module 401 is used for setting the output power of the link to be detected to have a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the link to be detected;

[0082] The isolation detection module 402 is used to find the critical output power that causes the link to be detected to self-excite within the adjustment range of the output power according to the dichotomy method, and the critical output power is the isolation of the link to be detected.

[0083] In one embodiment of the present application, applied to a repeater, the power setting module 401 includes:

[0084] The downlink setting submodule 4011 is used to open the downlink and close the uplink. The output power of the downlink has a low threshold and a high threshold. The adjustment range of the output power is set according to the preset parameters of the downlink.

[0085] In one embodiment of the present application, the isolation detection module 402 includes:

[0086] A low threshold value judgment submodule 4021 is used to detect the real-time output power and judge whether the real-time output power is higher than the low threshold;

[0087] A high threshold value judgment submodule 4022, configured to judge whether the real-time output power is higher than a high threshold when the real-time output power is higher than a low threshold;

[0088] The step value judgment submodule 4023 is used for, when the real-time output power is higher than the upper threshold, the downlink self-excites, adds the attenuation value of the output power to half of the attenuation adjustment range, halves the adjustment range, and judges whether the attenuation adjustment range is less than or equal to the step value;

[0089] The isolation calculation submodule 4024 is used to record the current attenuation value and calculate the link gain, namely the isolation, when the attenuation adjustment range is less than or equal to the step.

[0090] In one embodiment of the present application, the system further includes:

[0091] Less than step value judgment module 403, 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 the upper threshold, halving the adjustment range, and judging whether the attenuation adjustment range is less than or equal to the step value;

[0092] The attenuation value recording and calculating module 404 is used 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.

[0093] In one embodiment of the present application, the system includes:

[0094] The isolation detection ending module 405 is used to determine that the isolation is large enough if the real-time output power is lower than the lower threshold, and there is no need to adjust the gain of the link to be detected, thereby ending the isolation detection.

[0095] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for detecting isolation, characterized in that: The method comprises: 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 method, finding the critical output power causing the self-excitation of the link to be detected within the adjustment range of the output power; Wherein, when applied to a repeater, 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, including: Open the downlink and close the 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; Wherein, the method further comprises: Detecting the real-time output power, and determining whether the real-time output power is higher than a lower threshold; When the real-time output power is higher than a lower threshold, determining whether the real-time output power is higher than a higher threshold; When the real-time output power is higher than the upper threshold, the downlink is self-excited, the attenuation value of the output power is added to half of the attenuation adjustment range, the attenuation adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step; When the attenuation adjustment range is greater than the step, returning to the step of determining whether the real-time output power is higher than a high threshold; When the attenuation adjustment range is less than or equal to the step, the current attenuation value is recorded, and the link gain is calculated according to the attenuation value, that is, the isolation; Wherein, the method further comprises: When the real-time output power is lower than the upper threshold, the attenuation value of the output power is reduced by half of the attenuation adjustment range, the attenuation adjustment range is halved, and it is determined whether the attenuation adjustment range is less than or equal to the step; When the attenuation adjustment range is greater than the step, returning to the step of determining whether the real-time output power is higher than a high threshold; When the attenuation adjustment range is less than or equal to the step, the current attenuation value is recorded, and the link gain is calculated according to the attenuation value, that is, the isolation; Wherein, the method further comprises: If the real-time output power is lower than the lower threshold, it is determined that the isolation is large enough, and there is no need to adjust the gain of the link to be detected, and the isolation detection is terminated.

2. A detection system for isolation, characterized in that: The system is used to perform the isolation detection method according to claim 1, and the system comprises: A power setting module, which is used for setting the output power of the link to be detected to have a low threshold and a high threshold, and setting the adjustment range of the output power according to the preset parameters of the link to be detected; An isolation detection module, used for finding the critical output power causing the self-excitation of the link to be detected within the adjustment range of the output power according to the dichotomy method; Wherein, the system is applied to a repeater station, and further includes: A downlink setting submodule, used to open the downlink and close the 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; Wherein, the isolation detection module includes: A low threshold value judgment submodule, used to detect the real-time output power and judge whether the real-time output power is higher than the low threshold; A high threshold value judgment submodule, used for judging whether the real-time output power is higher than a high threshold when the real-time output power is higher than a low threshold; A step value judgment submodule, used for, when the real-time output power is higher than the upper threshold, the downlink self-excites, adds half of the attenuation adjustment range to the attenuation value of the output power, halves the attenuation adjustment range, and judges whether the attenuation adjustment range is less than or equal to the step value; The system is also used to return to the step of determining whether the real-time output power is higher than a high threshold when the attenuation adjustment range is greater than the step; The isolation calculation submodule is used to record the current attenuation value when the attenuation adjustment range is less than or equal to the step, and calculate the link gain according to the attenuation value, that is, the isolation; Wherein, the system further comprises: A less than step value judgment module is used to reduce the attenuation value of the output power by half of the attenuation adjustment range when the real-time output power is lower than the upper threshold, and to halve the attenuation adjustment range to determine whether the attenuation adjustment range is less than or equal to the step value; When the attenuation adjustment range is greater than the step, returning to the step of determining whether the real-time output power is higher than a high threshold; An attenuation value recording and calculation module, used for recording the current attenuation value when the attenuation adjustment range is less than or equal to the step, and calculating the link gain, i.e., the isolation, according to the attenuation value; Wherein, the system further comprises: The isolation detection termination module is used to determine that the isolation is large enough if the real-time output power is lower than the lower threshold, and there is no need to adjust the gain of the link to be detected, thereby terminating the isolation detection.

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