A method and system for suppressing background noise in repeaters

Abstract

This application relates to the field of communication signal processing, and in particular to a method and system for suppressing the noise floor of a repeater, comprising the following steps: acquiring the intermediate frequency (IF) signal of the repeater's uplink; accumulating the power of multiple IF signals to obtain an accumulated power value; determining whether the accumulated power value is greater than a first noise floor threshold; if the accumulated power value is greater than the first noise floor threshold, then opening the repeater's uplink; if the accumulated power value is less than or equal to the first noise floor threshold, then further determining whether the accumulated power value is greater than a second noise floor threshold; if the accumulated power value is greater than the second noise floor threshold, then performing spectrum analysis on the signal; determining whether the signal is a useful signal; if the signal is a useful signal, then opening the repeater's uplink; if the signal is a useless signal, then closing the repeater's uplink; if the accumulated power value is less than or equal to the second noise floor threshold, then closing the repeater's uplink. This application has the effect of reducing the occurrence of repeater misjudgment leading to the closure of the repeater's uplink.

Description

Technical Field

[0001] This application relates to the field of communication signal processing, and in particular to a method and system for suppressing background noise in repeaters. Background Technology

[0002] In the field of communications, repeaters are an important piece of equipment that plays a key role in expanding signal coverage and enhancing signal strength.

[0003] Existing methods for suppressing repeater noise floor typically involve acquiring the intermediate frequency (IF) signal from the repeater's uplink and then calculating the sum of multiple IF signals to form a power accumulation value. This power accumulation value is then compared to a preset noise floor threshold, and the uplink is activated or deactivated based on the comparison result. If the power accumulation value is greater than the preset noise floor threshold, the uplink is activated; if the power accumulation value is less than or equal to the preset noise floor threshold, the uplink is deactivated. This approach aims to improve signal quality by controlling the uplink to prevent the repeater from amplifying noise and thus raising the noise floor.

[0004] However, this existing method for suppressing the noise floor of repeaters has significant drawbacks. For users at the edge of the repeater's coverage area, the power accumulation value may be less than or equal to the noise floor threshold when receiving signals from the repeater, leading to misjudgment. Summary of the Invention

[0005] To reduce the occurrence of repeater uplink shutdown due to misjudgment, this application provides a repeater noise floor suppression method and system.

[0006] This application provides a method and system for suppressing background noise in repeaters, which adopts the following technical solution:

[0007] A method for suppressing the noise floor of a repeater includes the following steps: acquiring the intermediate frequency (IF) signal of the repeater's uplink; accumulating the power of multiple IF signals to obtain an accumulated power value; determining whether the accumulated power value is greater than a first noise floor threshold; if the accumulated power value is greater than the first noise floor threshold, then opening the repeater's uplink; if the accumulated power value is less than or equal to the first noise floor threshold, then determining whether the accumulated power value is greater than a second noise floor threshold; if the accumulated power value is greater than the second noise floor threshold, then performing spectral analysis on the signal; determining whether the signal is a useful signal; if the signal is a useful signal, then opening the repeater's uplink; if the signal is a useless signal, then closing the repeater's uplink; if the accumulated power value is less than or equal to the second noise floor threshold, then closing the repeater's uplink; wherein the first noise floor threshold is greater than the second noise floor threshold.

[0008] By adopting the above technical solution, the intermediate frequency signal of the repeater uplink is acquired and the power is accumulated to obtain the power accumulation value. The power accumulation value is first compared with the first noise floor threshold. If it is greater than the first noise floor threshold, the repeater uplink is turned on. If it is less than or equal to the first noise floor threshold, it is compared with the second noise floor threshold. When it is greater than the second noise floor threshold, spectrum analysis is performed to determine whether the signal is a useful signal, and then it is decided whether to turn on the repeater uplink. If it is less than or equal to the second noise floor threshold, the repeater uplink is turned off. This can reduce the misjudgment caused by making a judgment based solely on the power accumulation value being less than or equal to the first noise floor threshold, and can more accurately identify whether there is a useful signal in the repeater, effectively reducing the situation where the repeater uplink is turned off due to misjudgment.

[0009] Optionally, after determining that the signal is a useful signal, the first noise floor threshold is reduced by a preset first adjustment value, and the first noise floor threshold remains greater than the second noise floor threshold; after the power accumulation value is obtained by power accumulation of multiple intermediate frequency signals, the first noise floor threshold is restored to its initial value based on the time elapsed since the last reduction of the first noise floor threshold by the first adjustment value, and then the determination of whether the power accumulation value is greater than the first noise floor threshold is performed.

[0010] By adopting the above technical solution, after determining that the signal is a useful signal, the first noise floor threshold is reduced by a preset first adjustment value, which makes it easier for the repeater to detect the useful signal and reduces the number of spectrum analyses; the first noise floor threshold is kept greater than the second noise floor threshold to ensure that the judgment logic is reasonable; the first noise floor threshold is restored to its initial value based on the time elapsed since the last reduction of the first noise floor threshold by the first adjustment value, which allows the system to return to the initial judgment standard at an appropriate time to adapt to different signal environments.

[0011] Optionally, restoring the first noise floor threshold to its initial value based on the time elapsed since the last reduction of the first noise floor threshold by the first adjustment value includes the following steps: determining whether the first noise floor threshold is the initial value; if the first noise floor threshold is the initial value, then determining whether the accumulated power value is greater than the first noise floor threshold; if the first noise floor threshold is not the initial value, then obtaining an interval time, the interval time being the time elapsed since the last reduction of the first noise floor threshold by the preset first adjustment value; obtaining a first time threshold; determining whether the interval time is greater than the first time threshold; if the interval time is greater than the first time threshold, then increasing the first noise floor threshold by the first adjustment value, and keeping the first noise floor threshold less than or equal to the initial value, then determining whether the accumulated power value is greater than the first noise floor threshold; if the interval time is less than or equal to the first time threshold, then directly determining whether the accumulated power value is greater than the first noise floor threshold.

[0012] By adopting the above technical solution, firstly determining whether the first noise floor threshold is the initial value can avoid unnecessary recovery operations. If the first noise floor threshold is not the initial value, the interval time is obtained and compared with the first time threshold. When the interval time is greater than the first time threshold, the first noise floor threshold is increased by the first adjustment value while ensuring that it is less than or equal to the initial value. This allows the first noise floor threshold to gradually recover to the initial value state, thereby adapting to different signal environments and reducing the misjudgment rate. When the interval time is less than or equal to the first time threshold, the operation of recovering to the initial value is not performed. Instead, the power accumulation value is directly judged against the first noise floor threshold, which can reduce the signal transmission delay of the repeater and reduce the frequency of repeated start-up and shutdown of the repeater.

[0013] Optionally, after obtaining the first time threshold, the method further includes the following steps: obtaining the number of changes based on a preset acquisition time, wherein the number of changes is the number of times the repeater uplink is opened and closed during the acquisition time; obtaining the change frequency based on the acquisition time and the number of changes; determining whether the change frequency is greater than the change frequency threshold; if the change frequency is greater than the change frequency threshold, increasing the first time threshold by a second adjustment value; if the change frequency is less than or equal to the change frequency threshold, decreasing the first time threshold by the second adjustment value, and keeping the first time threshold greater than or equal to its initial value.

[0014] By adopting the above technical solution, the number of changes in the uplink of the repeater is obtained according to the preset collection time, and the change frequency is obtained. After comparing it with the change frequency threshold, the first time threshold is dynamically adjusted, which can reduce the frequent opening and closing of the uplink of the repeater.

[0015] Optionally, after acquiring the intermediate frequency (IF) signal of the repeater uplink, the method further includes the following steps: acquiring status information and power value, wherein the status information includes whether the repeater uplink is off or on, and the power value is the power of the last acquired IF signal; determining whether the status information indicates that the repeater uplink is on; if the status information indicates that the repeater uplink is on, directly executing the repeater uplink on based on the power value and a preset third noise floor threshold; if the status information indicates that the repeater uplink is off, directly executing the repeater uplink off based on the power value and the third noise floor threshold.

[0016] By adopting the above technical solution, after acquiring the intermediate frequency (IF) signal of the repeater uplink, the uplink can be directly turned on or off based on the status information of the repeater uplink, the power value of the last acquired IF signal, and the third noise floor threshold. This reduces the process of power accumulation calculation for all IF signals, improves the response speed of the repeater noise floor suppression method, reduces unnecessary calculations, and thus controls the uplink of the repeater more efficiently, thereby suppressing the noise floor.

[0017] Optionally, the uplink of the repeater can be directly enabled based on the power value and a preset third noise floor threshold, including the following steps: determining whether the power value is greater than the third noise floor threshold; if the power value is greater than the third noise floor threshold, then enabling the uplink of the repeater; if the power value is less than or equal to the third noise floor threshold, then performing power accumulation on multiple intermediate frequency signals to obtain a power accumulation value.

[0018] By adopting the above technical solution, after obtaining the intermediate frequency signal of the repeater uplink, the status information, power value, and third noise floor threshold are obtained. When the status information indicates that the repeater uplink is enabled, based on the comparison result between the power value and the third noise floor threshold, if the power value is greater than the third noise floor threshold, the repeater uplink can be directly enabled, reducing unnecessary power accumulation calculation process and improving the efficiency of enabling the repeater uplink. If the power value is less than or equal to the third noise floor threshold, the power of multiple intermediate frequency signals is accumulated to obtain the power accumulation value, ensuring the accuracy of subsequent judgments and further optimizing the repeater noise floor suppression method.

[0019] Optionally, the uplink of the repeater can be shut down directly based on the power value and the third noise floor threshold, including the following steps: determining whether the power value is less than the third noise floor threshold; if the power value is less than the third noise floor threshold, shutting down the uplink of the repeater; if the power value is greater than or equal to the third noise floor threshold, performing power accumulation on multiple intermediate frequency signals to obtain a power accumulation value.

[0020] By adopting the above technical solution, after acquiring the intermediate frequency signal of the repeater uplink, the status information, power value, and third noise floor threshold are obtained. When the status information indicates that the repeater uplink is off, a judgment is made based on the power value and the third noise floor threshold. If the power value is less than the third noise floor threshold, the repeater uplink is directly shut down, which can quickly shut down the link to suppress the noise floor. If the power value is greater than or equal to the third noise floor threshold, the power of multiple intermediate frequency signals is accumulated to obtain the accumulated power value, and subsequent judgments are continued. This can avoid misjudgment caused by inaccurate judgment of a single power value and further improve the accuracy of repeater noise floor suppression.

[0021] Optionally, after opening and closing the repeater uplink, the number of changes is obtained according to a preset acquisition time, where the number of changes is the number of times the repeater uplink is opened and closed within the acquisition time; the change frequency is obtained based on the acquisition time and the number of changes; it is determined whether the change frequency is greater than a preset change threshold; if the change frequency is greater than the change threshold, the repeater uplink is kept open for a preset time, and then the acquisition of the intermediate frequency signal of the repeater uplink is returned; if the change frequency is less than the change threshold, the acquisition of the intermediate frequency signal of the repeater uplink is returned directly.

[0022] By adopting the above technical solution, after the uplink of the repeater is turned on or off, the number of times it changes within the acquisition time is obtained, and the change frequency is obtained. When the change frequency is greater than the second frequent threshold, the uplink of the repeater is kept on for a preset time before returning to acquire the intermediate frequency signal. This can reduce the occurrence of frequent opening and closing of the uplink of the repeater and ensure the stability and reliability of signal transmission. When the change frequency is less than or equal to the second frequent threshold, the acquisition of the intermediate frequency signal is directly returned, which can respond to signal changes in a timely manner and continuously perform noise floor suppression processing.

[0023] A repeater noise floor suppression system includes a signal acquisition unit, a calculation unit, a comparison unit, and a control unit. The signal acquisition unit is used to acquire the intermediate frequency (IF) signal of the repeater's uplink. The calculation unit is electrically connected to the signal acquisition unit and is used to calculate the sum of the IF signals to form a power accumulation value. The comparison unit is electrically connected to both the calculation unit and the control unit and is used to compare the power accumulation value with a preset noise floor threshold. The control unit is used to control the opening or closing of the repeater's uplink based on the comparison result.

[0024] By adopting the above technical solution, the signal acquisition unit can acquire the intermediate frequency signal of the repeater uplink, the calculation unit can calculate the sum of the intermediate frequency signals to form a power accumulation value, the comparison unit can compare the power accumulation value with a preset noise floor threshold, and the control unit can control the opening or closing of the repeater uplink according to the comparison result, thereby achieving effective suppression of the repeater noise floor, avoiding the repeater from amplifying noise and raising the noise floor, and reducing misjudgment of signal reception for users at the edge of the repeater coverage area.

[0025] Optionally, a status indication module is also included, which includes a first indicator light and a second indicator light, corresponding to the on and off states of the uplink of the repeater station and displaying the working status in real time.

[0026] By adopting the above technical solution, the first indicator light and the second indicator light can be used to display the open and closed status of the repeater's uplink, thereby realizing real-time display of the working status and making it easier to intuitively understand the repeater's operating status.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] By setting a first noise floor threshold and a second noise floor threshold, and performing spectrum analysis on the signal when the power accumulation value is between the two thresholds to determine whether it is a useful signal, compared with the existing method that only uses a single threshold for judgment, it can more accurately identify the signals of users at the edge of the repeater coverage area and effectively reduce the misjudgment of the signals of these users.

[0029] By utilizing acquired status information, power values, and a third noise floor threshold, as well as by combining dual noise floor thresholds with spectrum analysis, the uplink of the repeater can be precisely controlled to enable and disable the repeater to process signals more effectively, thereby improving communication in signal blind spots and weak areas. Attached Figure Description

[0030] Figure 1 This is a flowchart of steps S1-S8 and step S13 of Embodiment 1 of this application.

[0031] Figure 2 This is a flowchart of step S4 in Embodiment 1 of this application;

[0032] Figure 3 This is a flowchart of step S5 in Embodiment 1 of this application;

[0033] Figure 4 This is a flowchart of step S7 in Embodiment 1 of this application;

[0034] Figure 5 This is a flowchart of steps S8-S14 of Embodiment 1 of this application;

[0035] Figure 6 This is a flowchart of step S1, and steps S13-S18 of embodiment 1 of this application.

[0036] Figure 7 This is a flowchart of steps S19-S23 of Embodiment 1 of this application. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail. Example 1

[0038] This application discloses a method and system for suppressing background noise in repeaters.

[0039] Reference Figure 1 A method for suppressing background noise in repeaters includes the following steps:

[0040] Step S1: Obtain the intermediate frequency signal of the uplink of the repeater. Then proceed to step S2.

[0041] The uplink signal of a repeater passes sequentially through an antenna, a low-noise amplifier, a downconverter, an intermediate frequency (IF) filter, an IF amplifier, an analog-to-digital converter (ADC), and digital signal processing. The IF signal, located between the downconverter output and the ADC input, is typically an analog signal. Methods for obtaining the IF signal generally include direct coupling, a splitter method, and an internal debugging interface.

[0042] The direct coupling method extracts the signal directly from the output of the intermediate frequency (IF) filter or amplifier via a physical interface. The splitter method involves inserting a passive splitter into the IF signal path, with one path continuing the original link and the other leading to the test equipment. The internal debugging interface allows for software or hardware-triggered output of the IF signal.

[0043] Step S2: Obtain status information and power value. Then proceed to step S3.

[0044] The status information includes whether the repeater's uplink is on or off, and the power value is the power of the last acquired intermediate frequency (IF) signal. The status information can be acquired using a status sensor, which can monitor the on / off status of the repeater's uplink in real time. The power value can be obtained using a power meter, which can accurately measure the power of the last acquired IF signal.

[0045] Step S3: Determine whether the status information indicates that the uplink of the repeater station is enabled; if yes, proceed to step S4; if no, proceed to step S5.

[0046] After acquiring the intermediate frequency signal, a preliminary judgment is made based on the status information, power value, and third noise floor threshold. This allows for a quick determination of whether subsequent power accumulation and multi-stage judgment processes are necessary. This reduces unnecessary calculations and processing, improving the system's response speed and processing efficiency.

[0047] Reference Figure 1 , Figure 2 Step S4: Directly enable the uplink of the repeater station based on the power value and the third noise floor threshold.

[0048] Step S4 includes the following steps:

[0049] Step S41: Determine whether the power value is greater than the third noise floor threshold; if yes, proceed to step S13; if no, proceed to step S6.

[0050] If the repeater uplink is enabled at this point, then disabling the repeater uplink requires a power value below the third noise floor threshold. This application keeps the repeater uplink enabled when the power value is above the third noise floor threshold, eliminating the need for subsequent steps and thus reducing unnecessary calculations and processing, improving system response speed and processing efficiency.

[0051] Reference Figure 1 , Figure 3 Step S5: Directly shut down the uplink of the repeater station based on the power value and the third noise floor threshold.

[0052] Step S5 includes the following steps:

[0053] Step S51: Determine whether the power value is less than the third noise floor threshold; if yes, proceed to step S14; if no, proceed to step S6.

[0054] If the repeater uplink is currently off, then enabling the repeater uplink requires a power value greater than the third noise floor threshold. This application keeps the repeater uplink off when the power value is less than the third noise floor threshold, eliminating the need for subsequent steps. This reduces unnecessary calculations and processing, improving system response speed and processing efficiency.

[0055] Step S6: Accumulate the power of multiple intermediate frequency signals to obtain the accumulated power value. Then proceed to step S7.

[0056] A preset time window is used to sum the intermediate frequency signals within the time window to obtain the power accumulation value.

[0057] Step S7: Restore the first noise floor threshold to its initial value based on the time elapsed since the last time the first adjustment value was reduced by the first noise floor threshold. Then proceed to step S8.

[0058] In subsequent step S12, since the power accumulation value is between the first noise floor threshold and the second noise floor threshold, the first noise floor threshold is then reduced by a first adjustment value. The reduced first noise floor threshold is then assessed here to determine whether it needs to be restored.

[0059] Reference Figure 1 , Figure 4 Step S7 includes the following steps:

[0060] Step S71: Determine whether the first noise floor threshold is the initial value; if yes, proceed to step S8; if no, proceed to step S72.

[0061] If the first noise floor threshold is the initial value, then there is no need to restore the first noise floor threshold; proceed directly to step S8. If the first noise floor threshold is not the initial value, then it is necessary to further determine whether the initial value needs to be restored before proceeding to step S8.

[0062] Step S72: Obtain the interval time. Then proceed to step S73.

[0063] The interval is the time elapsed since the last reduction of the first noise floor threshold by the preset first adjustment value. The interval can be obtained using a timer.

[0064] Step S73: Obtain the first time threshold. Then proceed to step S74.

[0065] In the embodiments of this application, the first time threshold is a preset value.

[0066] Step S74: Determine whether the interval time is greater than the first time threshold; if yes, proceed to step S75; if no, proceed to step S8.

[0067] Step S75: Increase the first noise floor threshold by the first adjustment value, while keeping the first noise floor threshold less than or equal to the initial value. Then execute step S8.

[0068] If the interval is longer than the first time threshold, then the time since the last reduction of the first noise floor threshold is longer. Users at the edge of the repeater's coverage area may have stopped transmitting signals. In this case, gradually increasing the first noise floor threshold resumes, thus suppressing the noise floor.

[0069] If the interval is less than or equal to the first time threshold, then the time since the last reduction of the first noise floor threshold is short. Users at the edge of the repeater's coverage area may still be transmitting signals. At this time, the first noise floor threshold is low, making it easier for the repeater to receive user signal strength greater than the first noise floor threshold, thus reducing latency.

[0070] Reference Figure 1 , Figure 5 Step S8: Determine whether the power accumulation value is greater than the first noise floor threshold; if yes, proceed to step S13; if no, proceed to step S9.

[0071] When the power accumulation value is greater than the first noise floor threshold, the signal received by the repeater has a useful signal, so the repeater needs to keep the uplink on.

[0072] Step S9: Determine whether the power accumulation value is greater than the second noise floor threshold; if yes, proceed to step S10; if no, proceed to step S14.

[0073] If the accumulated power value is less than or equal to the first noise floor threshold, further determination is made as to whether the accumulated power value is greater than the second noise floor threshold. If the accumulated power value is greater than the second noise floor threshold, it may be due to weak user signals at the edge of the repeater's coverage area. Further analysis of the signal is needed to determine if it is a useful signal, thereby reducing the occurrence of users being unable to transmit signals.

[0074] The first noise floor threshold is greater than the second noise floor threshold. The value of the third noise floor threshold is determined based on the power of a single intermediate frequency (IF) signal, while the first noise floor threshold is set based on the power of multiple IF signals. After setting the first noise floor threshold, the third noise floor threshold is obtained by dividing the first noise floor threshold by the number of IF signals.

[0075] Step S10: Perform spectrum analysis on the signal. Then proceed to step S11.

[0076] Spectrum analyzers can be used to perform spectrum analysis, which can analyze the spectral characteristics of a signal in detail and determine whether the signal is useful. Alternatively, signal analysis software can be used to perform spectrum analysis, which can process and analyze the acquired signal in depth to obtain accurate results.

[0077] Step S11: Determine whether the signal is a useful signal; if yes, proceed to step S12; if no, proceed to step S14.

[0078] Generally, useful signals exhibit periodicity or correlation, while their noise spectrum distribution is random and lacks a fixed pattern. By analyzing the signal spectrum using Fast Fourier Transform (FFT), if the spectrum shows a regularity, it is determined to be a useful signal.

[0079] Step S12: Reduce the first noise floor threshold by a preset first adjustment value, while keeping the first noise floor threshold greater than the second noise floor threshold. Then proceed to step S13.

[0080] After reducing the first noise floor threshold multiple times with the first adjustment value, if the first noise floor threshold is lower than the second noise floor threshold, the first noise floor threshold is not reduced, so that the first noise floor threshold remains greater than the second noise floor threshold.

[0081] Step S13: Open the uplink of the repeater. Then proceed to step S15.

[0082] Step S14: Shut down the uplink of the repeater. Then proceed to step S15.

[0083] Reference Figure 1 , Figure 6 Step S15: Obtain the number of changes according to the preset collection time. Then proceed to step S16.

[0084] The number of changes represents the number of times the repeater's uplink is opened and closed within the data collection period.

[0085] Step S16: Obtain the change frequency based on the collection time and the number of changes. Then proceed to step S17.

[0086] The frequency of change is obtained by dividing the number of changes by the acquisition time.

[0087] Step S17: Determine whether the change frequency is greater than the preset change threshold; if yes, proceed to step S18; if no, proceed to step S1.

[0088] Step S18: After keeping the uplink of the repeater open for a preset time, return to step S1.

[0089] When the frequency of change exceeds a threshold, the uplink of the repeater is frequently started and stopped. By keeping the repeater's uplink open for a period of time, the latency for users can be reduced.

[0090] A repeater noise floor suppression system, applied to a repeater noise floor suppression method in an embodiment of this application, includes a signal acquisition unit, a calculation unit, a comparison unit, and a control unit.

[0091] The signal acquisition unit is used to acquire the intermediate frequency (IF) signal of the repeater's uplink. Methods such as direct coupling, splitter methods, and internal debugging interfaces can be used.

[0092] The computing unit is electrically connected to the signal acquisition unit and is used to calculate the sum of the intermediate frequency signals to form a power accumulation value. A signal processing chip can be used as the computing unit; signal processing chips have strong computing power and can quickly and accurately complete the power accumulation calculation. Alternatively, a data processor can be used; a data processor can efficiently process the acquired signals to obtain the power accumulation value.

[0093] The comparison unit is electrically connected to both the calculation unit and the control unit, and is used to compare the accumulated power value with a preset noise floor threshold. A comparison circuit can be used as the comparison unit, which can output the comparison result quickly and accurately.

[0094] The control unit is used to control the uplink of the repeater to be turned on or off based on the comparison results. The function of the control unit can be implemented using relays, which can accurately control the on / off state of the repeater's uplink based on control signals.

[0095] In addition, the system also includes a status indication module, which includes a first indicator light and a second indicator light, corresponding to the on and off states of the repeater's uplink, respectively, and displaying the operating status in real time. The first and second indicator lights can be light-emitting diodes (LEDs), which are characterized by high brightness and low power consumption, and can clearly display the operating status of the repeater's uplink.

[0096] The implementation principle of the repeater noise floor suppression method and system in this application is as follows: By setting two different noise floor thresholds and performing spectrum analysis under specific conditions, this embodiment can more comprehensively and accurately determine whether a signal is a useful signal. Compared with the traditional single noise floor threshold judgment method, it reduces the misjudgment of signals from users at the edge of the repeater coverage area, improves the accuracy of repeater noise floor suppression, and thus effectively improves signal quality. At the same time, this multi-level judgment and spectrum analysis method has strong adaptability and flexibility, and can better meet the signal processing needs in different environments. Example 2

[0097] This application discloses a method and system for suppressing background noise in repeaters.

[0098] Reference Figure 7 The difference between the repeater noise suppression method in this application embodiment and embodiment 1 is that the first time threshold in this application embodiment is dynamically adjusted.

[0099] After obtaining the first time threshold, the following steps are also included:

[0100] Step S19: Obtain the number of changes according to the preset collection time. Then proceed to step S20.

[0101] The number of times the repeater uplink is turned on and off during the data collection period;

[0102] Step S20: Obtain the frequency of change based on the collection time and the number of changes. Then proceed to step S21.

[0103] Step S21: Determine whether the frequency of change is greater than the frequency threshold; if yes, proceed to step S22; if no, proceed to step S23.

[0104] Step S22: Increase the first time threshold by the second adjustment value. Then proceed to step S74.

[0105] Step S23: Decrease the first time threshold by the second adjustment value, while keeping the first time threshold greater than or equal to its initial value. Then proceed to step S74.

[0106] The implementation principle of the repeater noise floor suppression method and system in this application embodiment is as follows: By monitoring the frequency of uplink activation and deactivation of the repeater and dynamically adjusting the first time threshold according to the frequency, it can better adapt to different signal environments. When the activation and deactivation frequency is high, increasing the first time threshold can reduce the frequent adjustments of the system and improve the system stability; when the activation and deactivation frequency is low, decreasing the first time threshold can make the system respond to signal changes more promptly, improve the repeater's signal processing efficiency, and thus further optimize the repeater's noise floor suppression performance.

[0107] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for suppressing background noise in repeaters, characterized in that, Includes the following steps: Acquire the intermediate frequency (IF) signal of the uplink of the repeater; accumulate the power of multiple IF signals to obtain an accumulated power value; determine whether the accumulated power value is greater than a first noise floor threshold; If the accumulated power value is greater than the first noise floor threshold, then the uplink of the repeater is opened; if the accumulated power value is less than or equal to the first noise floor threshold, then it is determined whether the accumulated power value is greater than the second noise floor threshold. If the accumulated power value is greater than the second noise floor threshold, then perform spectrum analysis on the signal; determine whether the signal is a useful signal; if the signal is a useful signal, then open the repeater uplink; if the signal is a useless signal, then close the repeater uplink; if the accumulated power value is less than or equal to the second noise floor threshold, then close the repeater uplink; the first noise floor threshold is greater than the second noise floor threshold. After determining that the signal is a useful signal, the first noise floor threshold is reduced by a preset first adjustment value, and the first noise floor threshold remains greater than the second noise floor threshold; after the power accumulation value is obtained by power accumulation of multiple intermediate frequency signals, the first noise floor threshold is restored to the initial value according to the time since the last reduction of the first noise floor threshold by the first adjustment value, and then the power accumulation value is determined to be greater than the first noise floor threshold. The method restores the first noise floor threshold to its initial value based on the time elapsed since the last reduction of the first noise floor threshold by a first adjustment value, including the following steps: determining whether the first noise floor threshold is the initial value; if the first noise floor threshold is the initial value, then determining whether the accumulated power value is greater than the first noise floor threshold; if the first noise floor threshold is not the initial value, then obtaining an interval time, the interval time being the time elapsed since the last reduction of the first noise floor threshold by a preset first adjustment value; obtaining a first time threshold; determining whether the interval time is greater than the first time threshold; if the interval time is greater than the first time threshold, then increasing the first noise floor threshold by the first adjustment value, and keeping the first noise floor threshold less than or equal to the initial value, then determining whether the accumulated power value is greater than the first noise floor threshold; if the interval time is less than or equal to the first time threshold, then directly determining whether the accumulated power value is greater than the first noise floor threshold.

2. The method for suppressing background noise in a repeater according to claim 1, characterized in that: After obtaining the first time threshold, the method further includes the following steps: obtaining the number of changes based on a preset collection time, wherein the number of changes is the number of times the repeater uplink is opened and closed during the collection time; obtaining the change frequency based on the collection time and the number of changes; determining whether the change frequency is greater than the change frequency threshold; if the change frequency is greater than the change frequency threshold, increasing the first time threshold by a second adjustment value; if the change frequency is less than or equal to the change frequency threshold, decreasing the first time threshold by the second adjustment value, and keeping the first time threshold greater than or equal to its initial value.

3. The method for suppressing background noise in a repeater according to claim 1, characterized in that: After acquiring the intermediate frequency (IF) signal of the repeater uplink, the process further includes the following steps: acquiring status information and power values, wherein the status information includes whether the repeater uplink is off or on, and the power value is the power of the last acquired IF signal; determining whether the status information indicates that the repeater uplink is on; if the status information indicates that the repeater uplink is on, directly executing the repeater uplink on based on the power value and a preset third noise floor threshold; if the status information indicates that the repeater uplink is off, directly executing the repeater uplink off based on the power value and the third noise floor threshold.

4. The method for suppressing background noise in a repeater according to claim 3, characterized in that: The uplink of the repeater is directly activated based on the power value and a preset third noise floor threshold, including the following steps: determining whether the power value is greater than the third noise floor threshold; if the power value is greater than the third noise floor threshold, then the uplink of the repeater is activated; if the power value is less than or equal to the third noise floor threshold, then the power of multiple intermediate frequency signals is accumulated to obtain the accumulated power value.

5. The method for suppressing background noise in a repeater according to claim 3, characterized in that: The uplink of the repeater is shut down directly based on the power value and the third noise floor threshold, including the following steps: determining whether the power value is less than the third noise floor threshold; if the power value is less than the third noise floor threshold, shutting down the uplink of the repeater; if the power value is greater than or equal to the third noise floor threshold, performing power accumulation on multiple intermediate frequency signals to obtain the power accumulation value.

6. The method for suppressing background noise in a repeater according to claim 1, characterized in that, After opening and closing the repeater uplink, the number of changes is obtained according to a preset acquisition time. The number of changes is the number of times the repeater uplink is opened and closed within the acquisition time. The change frequency is obtained based on the acquisition time and the number of changes. It is determined whether the change frequency is greater than a preset change threshold. If the change frequency is greater than the change threshold, the repeater uplink is kept open for a preset time, and then the acquisition of the intermediate frequency signal of the repeater uplink is returned. If the change frequency is less than or equal to the change threshold, the acquisition of the intermediate frequency signal of the repeater uplink is returned directly.

7. A repeater noise floor suppression system, applied to a repeater noise floor suppression method as described in any one of claims 1-6, characterized in that: The system includes a signal acquisition unit, a calculation unit, a comparison unit, and a control unit. The signal acquisition unit is used to acquire the intermediate frequency (IF) signal of the repeater's uplink. The calculation unit is electrically connected to the signal acquisition unit and is used to calculate the sum of the IF signals to form a power accumulation value. The comparison unit is electrically connected to both the calculation unit and the control unit and is used to compare the power accumulation value with a preset noise floor threshold. The control unit is used to control the uplink of the repeater to be turned on or off based on the comparison result.

8. A repeater noise floor suppression system according to claim 7, characterized in that: It also includes a status indicator module, which includes a first indicator light and a second indicator light, corresponding to the on and off states of the uplink of the repeater station and displaying the working status in real time.

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