CN107659352B - Self-excitation detection and processing method and device of micro repeater and baseband chip - Google Patents
Self-excitation detection and processing method and device of micro repeater and baseband chip Download PDFInfo
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- CN107659352B CN107659352B CN201610589934.2A CN201610589934A CN107659352B CN 107659352 B CN107659352 B CN 107659352B CN 201610589934 A CN201610589934 A CN 201610589934A CN 107659352 B CN107659352 B CN 107659352B
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Abstract
The invention provides a self-excitation detection and processing method and device of a micro repeater and a baseband chip. The method comprises the following steps: when the uplink and downlink amplifying links are all in a closed state, searching for a network, searching for a resident cell, and establishing downlink synchronization with the resident cell; measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal; when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time; and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time. The invention can detect and process self-excitation more timely and accurately.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a self-excitation detection and processing method and device of a miniature repeater and a baseband chip.
Background
The micro repeater has the advantages of simple structure, low cost, easy installation and the like, and is widely applied to blind areas and weak fields which are difficult to cover. The repeater belongs to the same-frequency wireless signal amplification equipment, due to the reasons of antenna isolation, gain change and the like, a downlink signal received by a donor antenna from a base station is amplified by the repeater and then transmitted by a retransmission antenna, and a part of signal is received by the donor antenna again and amplified again, so that a positive feedback loop is formed to cause self-excitation. After self-excitation, the power amplifier and low noise amplifier of the equipment can be saturated rapidly, the call quality is deteriorated rapidly, and the equipment can be burnt in severe cases. The existing repeater station has the mode of self-excitation processing, namely, the routing inspection of engineering technicians is enhanced, and the antenna isolation is ensured to be large enough during installation.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art: the self-excitation processing is limited by factors such as geographical conditions, the self-excitation detection is not accurate, and the self-excitation processing is not timely.
Disclosure of Invention
The method, the device and the baseband chip for self-excitation detection and processing of the micro repeater can perform self-excitation detection and processing more timely and accurately.
In a first aspect, the present invention provides a self-excitation detection and processing method for a micro repeater, including:
when the uplink and downlink amplifying links are all in a closed state, searching for a network, searching for a resident cell, and establishing downlink synchronization with the resident cell;
measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal;
when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time;
and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time.
Optionally, the comparing the real-time SNR with the reference SNR0, and performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power includes:
if a first number of continuous measuring points exist in the second time and meet the absolute SNR-SNR 0 absolute < th1, judging that the micro repeater does not generate self-excitation;
and opening an uplink and downlink amplification link, continuously measuring a real-time signal-to-noise ratio (SNR) in a third time, comparing the measured real-time SNR with the reference SNR0 again, and performing self-excitation judgment and corresponding processing again according to a comparison result and the downlink input power monitored in real time, wherein th1 is a first SNR threshold value.
Optionally, the comparing the real-time SNR with the reference SNR0, and performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power includes:
if a second number of measuring points exist in the second time and meet SNR 0-SNR > th1, and the downlink input power is smaller than the preset power, judging that the micro repeater has slight self-excitation, reporting to an upper-layer platform control module, and closing an uplink and downlink amplification link;
recalculating amplification gain according to downlink signal power, opening an uplink and downlink amplification link for signal forwarding when the output power under the amplification gain does not exceed rated power, remeasuring a real-time signal-to-noise ratio (SNR) in a second time, comparing the remeasured real-time SNR with the reference SNR0, and carrying out self-excitation judgment and corresponding processing again according to a comparison result and the real-time monitored downlink input power, wherein th1 is a first SNR threshold value.
Optionally, the comparing the real-time SNR with the reference SNR0, and performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power includes:
if a third number of measuring points exist in the second time and meet the SNR < th2, and the downlink input power is greater than the preset power, judging that the micro repeater has serious self-excitation, and reporting to an upper-layer platform control module;
searching the network again, searching for a new resident cell, establishing downlink synchronization with the new resident cell, re-measuring the signal-to-noise ratio of downlink signals in the first time, taking the average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, re-calculating amplification gain according to the power of the downlink signals, opening an uplink amplification link and a downlink amplification link for signal forwarding when the output power under the amplification gain does not exceed the rated power, re-measuring the real-time signal-to-noise ratio SNR in the second time, comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th2 is a.
In a second aspect, the present invention provides a self-excitation detection and processing apparatus for a micro repeater, including:
the network searching unit is used for searching the network, searching the resident cell and establishing downlink synchronization with the resident cell when the uplink and downlink amplifying links are all in a closed state;
the first measuring unit is used for measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal;
the second measurement unit is used for opening the uplink and downlink amplification links for signal forwarding and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time when the output power under the amplification gain does not exceed the rated power;
and the judgment processing unit is used for comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time.
Optionally, the determining processing unit is configured to determine that self-excitation of the micro-repeater does not occur when there are a first number of consecutive measurement points satisfying | SNR-SNR 0| < th1 within the second time;
the second measurement unit is configured to open the uplink and downlink amplification links, and continuously measure the real-time SNR within a third time; and the judgment processing unit is configured to compare the measured real-time SNR with the reference SNR0 again, and perform self-excitation judgment and corresponding processing again according to the comparison result and the monitored downlink input power in real time, where th1 is a first SNR threshold value.
Optionally, the determining and processing unit is configured to determine that the micro repeater has slight self-excitation when a second number of measurement points exist within the second time and meet SNR 0-SNR > th1 and downlink input power is smaller than preset power, report to the upper platform control module, and close the uplink and downlink amplification links;
the first measurement unit is configured to recalculate the amplification gain according to the downlink signal power; the second measurement unit is used for opening the uplink and downlink amplification links for signal forwarding when the output power under the amplification gain does not exceed the rated power, and re-measuring the real-time signal-to-noise ratio (SNR) in the second time; and the judgment processing unit is used for comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th1 is a first signal-to-noise ratio threshold value.
Optionally, the determining and processing unit is configured to determine that the micro repeater has severe self-excitation and report to the upper-layer platform control module when a third number of measurement points exist within the second time and meet SNR < th2, and the downlink input power is greater than a preset power;
the network searching unit is used for searching the network again, searching a new resident cell and establishing downlink synchronization with the resident new cell; the first measuring unit is configured to measure the signal-to-noise ratio of the downlink signal again within the first time, use an average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and recalculate the amplification gain according to the power of the downlink signal; the second measurement unit is used for opening the uplink and downlink amplification links for signal forwarding when the output power under the amplification gain does not exceed the rated power, and re-measuring the real-time signal-to-noise ratio (SNR) in the second time; and the judgment processing unit is used for comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th2 is a second signal-to-noise ratio threshold value.
In a third aspect, an embodiment of the present invention provides a baseband chip, where the baseband chip includes the apparatus for self-excitation detection and processing of the micro repeater.
According to the self-excitation detection and processing method, device and baseband chip of the micro repeater provided by the embodiment of the invention, when the uplink and downlink amplification links are all in a closed state, network searching is carried out, resident cells are searched, and downlink synchronization is established with the resident cells; measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal; when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time; and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time. Compared with the prior art, the method can judge whether the self-excitation occurs according to the detected real-time signal-to-noise ratio, the self-excitation detection and processing are more timely and accurate, in addition, an additional power detection circuit can be omitted, and the cost is saved.
Drawings
FIG. 1 is a flowchart of a self-excitation detection and processing method for a micro repeater according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a device for self-excitation detection and processing of a micro repeater according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a self-excitation detection and processing method of a miniature repeater, which is applied to a baseband chip and comprises the following steps:
s11, searching the network when the uplink and downlink amplifying links are all in a closed state, searching for a resident cell, and establishing downlink synchronization with the resident cell;
s12, measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal;
s13, when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time;
s14, comparing the real-time SNR with the reference SNR0, and performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power.
The self-excitation detection and processing method of the micro repeater provided by the embodiment of the invention has the advantages that when the uplink and downlink amplification links are all in a closed state, network searching is carried out, resident cells are searched, and downlink synchronization is established with the resident cells; measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal; when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time; and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time. Compared with the prior art, the method can judge whether the self-excitation occurs according to the detected real-time signal-to-noise ratio, the self-excitation detection and processing are more timely and accurate, in addition, an additional power detection circuit can be omitted, and the cost is saved.
Optionally, the comparing the real-time SNR with the reference SNR0, and performing self-excitation determination and corresponding processing according to the comparison result and the real-time monitored downlink input power may include:
if a first number of continuous measurement points exist in the second time and satisfy the condition of SNR-SNR 0 < th1, the signal to noise ratio is not deteriorated, the normal fluctuation is achieved, the stability can be realized within a certain time, and the micro repeater is judged not to have self-excitation. Opening an uplink and downlink amplification link, continuously measuring the real-time signal-to-noise ratio SNR in the third time, comparing the measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0 again, and performing self-excitation judgment and corresponding processing again according to the comparison result and the downlink input power monitored in real time, wherein th1 is a first signal-to-noise ratio threshold value.
If a second number of measurement points exist in the second time and meet SNR 0-SNR > th1, and the downlink input power is smaller than the preset power, the signal to noise ratio is deteriorated to a certain extent, but the input power is not particularly large, the micro repeater is judged to have slight self-excitation, and the slight self-excitation is reported to an upper-layer platform control module, and an uplink and downlink amplification link is closed. Recalculating amplification gain according to the downlink signal power, opening an uplink and downlink amplification link for signal forwarding when the output power under the amplification gain does not exceed the rated power, remeasuring the real-time signal-to-noise ratio (SNR) in the second time, comparing the remeasured real-time SNR with the reference SNR0, and carrying out self-excitation judgment and corresponding processing again according to the comparison result and the real-time monitored downlink input power, wherein th1 is a first SNR threshold value.
Specifically, a sliding time window may be counted, for example, 1 second, N SNR measurement values can be obtained in the 1 second, the N measurement values are continuously updated as time goes on, and as long as N1 measurement values among the N measurement values satisfy SNR 0-SNR > th1, it is determined that the micro repeater has slight self-excitation.
Thus, when the micro-repeater is judged to have slight self-excitation, the power amplifier is turned off, and the link gain is recalculated according to the strength of the received signal so as to protect the equipment.
If a third number of measurement points exist in the second time and meet the SNR < th2, and the downlink input power is greater than the preset power, the SNR is seriously deteriorated, the input power is rapidly increased, the circulating amplification of positive feedback is formed, the micro repeater is judged to have serious self-excitation, and the serious self-excitation is reported to an upper-layer platform control module. Searching the network again, searching for a new resident cell, establishing downlink synchronization with the new resident cell, re-measuring the signal-to-noise ratio of downlink signals in the first time, taking the average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, re-calculating amplification gain according to the power of the downlink signals, opening an uplink amplification link and a downlink amplification link for signal forwarding when the output power under the amplification gain does not exceed the rated power, re-measuring the real-time signal-to-noise ratio SNR in the second time, comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th2 is a second.
Specifically, a sliding time window may be counted, for example, 1 second, N SNR measurement values may be obtained in the 1 second, the N measurement values may be continuously updated as time goes on, and as long as N2 of the N measurement values satisfy SNR < th2, it is determined that the micro repeater has severe self-excitation.
Therefore, when the micro repeater is judged to have serious self-excitation, the network searching synchronization is carried out again, and the self-recovery forwarding state of the equipment is ensured.
When the micro repeater is judged to have slight self-excitation or serious self-excitation, the detection result is reported to the upper platform control module, and the upper platform control module lights a corresponding indicator lamp so as to correspondingly prompt inspection personnel or remind installation personnel to correct the antenna isolation.
In the above embodiments, th1, th2, and Pth are empirical values, and can be obtained through experimental tests, and can be adjusted according to actual requirements for self-excitation detection sensitivity, and in general, th1 is 10db, th2 is-10 db, and Pth is-45 dbm.
The embodiment of the present invention further provides a device for self-excitation detection and processing of a micro repeater, as shown in fig. 2, the device includes:
a network searching unit 11, configured to search a network, search for a cell where the network can reside, and establish downlink synchronization with the cell where the network can reside when the uplink and downlink amplification links are both in a closed state;
the first measurement unit 12 is configured to measure the signal-to-noise ratio of the downlink signal in the first time, use an average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculate an amplification gain according to the power of the downlink signal;
the second measurement unit 13 is configured to, when the output power under the amplification gain does not exceed a rated power, open the uplink and downlink amplification links to forward a signal, and continuously measure a real-time signal-to-noise ratio SNR within a second time;
and the judgment processing unit 14 is configured to compare the real-time SNR with the reference SNR0, and perform self-excitation judgment and corresponding processing according to a comparison result and the real-time monitored downlink input power.
Optionally, the determining processing unit 14 is configured to determine that self-excitation of the micro-repeater does not occur when there are a first number of consecutive measurement points satisfying | SNR-SNR 0| < th1 within the second time;
the second measurement unit 13 is configured to open the uplink and downlink amplification links, and continuously measure the real-time SNR within a third time; the judgment processing unit 14 is configured to compare the measured real-time SNR with the reference SNR0 again, and perform self-excitation judgment and corresponding processing again according to the comparison result and the real-time monitored downlink input power, where th1 is a first SNR threshold value.
Optionally, the determining and processing unit 14 is configured to determine that the micro repeater has slight self-excitation when a second number of measurement points exist within the second time and meet SNR 0-SNR > th1 and downlink input power is smaller than preset power, report to the upper platform control module, and close the uplink and downlink amplification links;
the first measurement unit 12 is configured to recalculate the amplification gain according to the downlink signal power; the second measurement unit 13 is configured to, when the output power under the amplification gain does not exceed a rated power, open an uplink and downlink amplification link for signal forwarding, and re-measure a real-time signal-to-noise ratio SNR within a second time; the judgment processing unit 14 is configured to compare the re-measured real-time SNR with the reference SNR0, and re-perform self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, where th1 is a first SNR threshold value.
Optionally, the determining and processing unit 14 is configured to determine that the micro repeater has severe self-excitation and reports to the upper-layer platform control module when a third number of measurement points exist within the second time and meet SNR < th2, and the downlink input power is greater than a preset power;
the network searching unit 11 is configured to search for a new network again, search for a new cell that can reside, and establish downlink synchronization with the new cell that resides; the first measurement unit 12 is configured to measure the signal-to-noise ratio of the downlink signal in the first time again, use an average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and recalculate the amplification gain according to the power of the downlink signal; the second measurement unit 13 is configured to, when the output power under the amplification gain does not exceed a rated power, open an uplink and downlink amplification link for signal forwarding, and re-measure a real-time signal-to-noise ratio SNR within a second time; the judgment processing unit 14 is configured to compare the re-measured real-time SNR with the reference SNR0, and re-perform self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, where th2 is a second SNR threshold.
According to the self-excitation detection and processing device of the micro repeater provided by the embodiment of the invention, when the uplink and downlink amplification links are all in a closed state, network searching is carried out, a resident cell is searched, and downlink synchronization is established with the resident cell; measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal; when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time; and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time. Compared with the prior art, the method can judge whether the self-excitation occurs according to the detected real-time signal-to-noise ratio, the self-excitation detection and processing are more timely and accurate, in addition, an additional power detection circuit can be omitted, and the cost is saved.
The embodiment of the invention also provides a baseband chip which comprises the device for self-excitation detection and processing of the miniature repeater.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A self-excitation detection and processing method of a micro repeater is characterized by comprising the following steps:
when the uplink and downlink amplifying links are all in a closed state, searching for a network, searching for a resident cell, and establishing downlink synchronization with the resident cell;
measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal;
when the output power under the amplification gain does not exceed the rated power, opening an uplink amplification link and a downlink amplification link for signal forwarding, and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time;
and comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time.
2. The method of claim 1, wherein the comparing the real-time SNR with the reference SNR0, and the self-excitation determination and corresponding processing according to the comparison result and the real-time monitored downlink input power comprises:
if a first number of continuous measuring points exist in the second time and meet the absolute SNR-SNR 0 absolute < th1, judging that the micro repeater does not generate self-excitation;
and opening an uplink and downlink amplification link, continuously measuring a real-time signal-to-noise ratio (SNR) in a third time, comparing the measured real-time SNR with the reference SNR0 again, and performing self-excitation judgment and corresponding processing again according to a comparison result and the downlink input power monitored in real time, wherein th1 is a first SNR threshold value.
3. The method of claim 1, wherein the comparing the real-time SNR with the reference SNR0, and the self-excitation determination and corresponding processing according to the comparison result and the real-time monitored downlink input power comprises:
if a second number of measuring points exist in the second time and meet SNR 0-SNR > th1, and the downlink input power is smaller than the preset power, judging that the micro repeater has slight self-excitation, reporting to an upper-layer platform control module, and closing an uplink and downlink amplification link;
recalculating amplification gain according to downlink signal power, opening an uplink and downlink amplification link for signal forwarding when the output power under the amplification gain does not exceed rated power, remeasuring a real-time signal-to-noise ratio (SNR) in a second time, comparing the remeasured real-time SNR with the reference SNR0, and carrying out self-excitation judgment and corresponding processing again according to a comparison result and the real-time monitored downlink input power, wherein th1 is a first SNR threshold value.
4. The method of claim 1, wherein the comparing the real-time SNR with the reference SNR0, and the self-excitation determination and corresponding processing according to the comparison result and the real-time monitored downlink input power comprises:
if a third number of measuring points exist in the second time and meet the SNR < th2, and the downlink input power is greater than the preset power, judging that the micro repeater has serious self-excitation, and reporting to an upper-layer platform control module;
searching the network again, searching for a new resident cell, establishing downlink synchronization with the new resident cell, re-measuring the signal-to-noise ratio of downlink signals in the first time, taking the average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, re-calculating amplification gain according to the power of the downlink signals, re-measuring the real-time signal-to-noise ratio SNR in the second time when the output power under the amplification gain does not exceed the rated power, comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th2 is a second signal-to-.
5. A self-excitation detection and processing device of a micro repeater is characterized by comprising:
the network searching unit is used for searching the network, searching the resident cell and establishing downlink synchronization with the resident cell when the uplink and downlink amplifying links are all in a closed state;
the first measuring unit is used for measuring the signal-to-noise ratio of the downlink signal in the first time, taking the average value of the signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and calculating amplification gain according to the power of the downlink signal;
the second measurement unit is used for opening the uplink and downlink amplification links for signal forwarding and continuously measuring the real-time signal-to-noise ratio (SNR) in the second time when the output power under the amplification gain does not exceed the rated power;
and the judgment processing unit is used for comparing the real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and performing self-excitation judgment and corresponding processing according to a comparison result and the downlink input power monitored in real time.
6. The apparatus of claim 5, wherein the determining unit is configured to determine that self-excitation of the micro-repeater has not occurred when there are a first number of consecutive measurement points satisfying | SNR-SNR 0| < th1 during the second time;
the second measurement unit is configured to open the uplink and downlink amplification links, and continuously measure the real-time SNR within a third time; and the judgment processing unit is configured to compare the measured real-time SNR with the reference SNR0 again, and perform self-excitation judgment and corresponding processing again according to the comparison result and the monitored downlink input power in real time, where th1 is a first SNR threshold value.
7. The apparatus of claim 5, wherein the determining unit is configured to determine that the micro repeater has slight self-excitation, report to the upper platform control module, and close the uplink and downlink amplifying links when a second number of measurement points exist within the second time and satisfy SNR 0-SNR > th1 and the downlink input power is less than a preset power;
the first measurement unit is configured to recalculate the amplification gain according to the downlink signal power; the second measurement unit is used for opening the uplink and downlink amplification links for signal forwarding when the output power under the amplification gain does not exceed the rated power, and re-measuring the real-time signal-to-noise ratio (SNR) in the second time; and the judgment processing unit is used for comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th1 is a first signal-to-noise ratio threshold value.
8. The apparatus of claim 5, wherein the determining unit is configured to determine that the micro repeater has severe self-excitation and report to the upper platform control module when a third number of measurement points exist in the second time and meet SNR < th2 and downlink input power is greater than a preset power;
the network searching unit is used for searching the network again, searching a new resident cell and establishing downlink synchronization with the resident new cell; the first measuring unit is configured to measure the signal-to-noise ratio of the downlink signal again within the first time, use an average value of the measured signal-to-noise ratio as a reference signal-to-noise ratio SNR0, and recalculate the amplification gain according to the power of the downlink signal; the second measuring unit is used for measuring the real-time signal-to-noise ratio SNR in the second time again when the output power under the amplification gain does not exceed the rated power; and the judgment processing unit is used for comparing the re-measured real-time signal-to-noise ratio SNR with the reference signal-to-noise ratio SNR0, and re-performing self-excitation judgment and corresponding processing according to the comparison result and the real-time monitored downlink input power, wherein th2 is a second signal-to-noise ratio threshold value.
9. A baseband chip, characterized in that, the baseband chip comprises the apparatus for self-excitation detection and processing of micro repeater according to any one of claims 5 to 8.
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