Method and apparatus for signal conditioning

Abstract

This invention discloses a method and apparatus for signal adjustment. The signal adjustment method includes: detecting whether the location of narrowband interference is outside the band; when the location of narrowband interference is outside the band, activating a notch filter; when the location of narrowband interference is inside the band, dynamically determining a threshold ratio based on the detected minimum frequency domain average amplitude value or packet error rate. The solution provided by this invention can achieve the technical effects of improving data throughput, detecting and receiving packets with smaller signals, or reducing packet error rate.

Description

Technical Field

[0001] This invention relates to the field of communication technology applications, and in particular to a method and apparatus for signal adjustment. Background Technology

[0002] In the field of power line communication, the signal transmission environment is complex and variable. Especially now that every household owns many new electrical appliances and entertainment devices, the power supplies used by these appliances and devices often have additional circuitry added to them for protection or to improve power efficiency. This can cause signal attenuation or narrowband interference. To reduce the impact of narrowband interference, notch filters are used to eliminate it. However, using notch filters also attenuates the signal; the closer to the frequency of the narrowband interference that the notch filter is meant to suppress, the greater the attenuation. Therefore, regardless of the magnitude of the narrowband interference, indiscriminately using notch filters can negatively impact performance.

[0003] There is currently no effective solution to the problem that the existing technology uses notch filters regardless of the magnitude of narrowband interference energy, which negatively impacts performance. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of the present invention aim to provide a signal adjustment method and apparatus to at least resolve the issue of negative impacts on performance caused by the invariant use of notch filters regardless of the magnitude of narrowband interference energy in the prior art.

[0005] The technical solution of this invention is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a signal adjustment method, comprising: detecting whether the location of narrowband interference is outside the band; when the location of narrowband interference is outside the band, enabling a notch filter; when the location of narrowband interference is inside the band, dynamically determining a threshold ratio by means of the detected minimum frequency domain average amplitude value or packet error rate.

[0007] Optionally, dynamically determining the threshold ratio based on the detected minimum frequency domain average amplitude value includes: enabling a preset minimum threshold ratio and performing signal detection based on the preset minimum threshold ratio; and calculating the threshold ratio based on the minimum frequency domain average amplitude value in the detected packet signal.

[0008] Further, optionally, calculating the threshold ratio based on the minimum frequency domain average amplitude value in the detected packet signal includes: setting a minimum threshold ratio, a maximum threshold ratio, the maximum packet signal frequency domain average amplitude, an observation period, and an observation time; setting the current threshold ratio as the minimum threshold ratio; detecting the frequency domain average amplitude of the received packet signal during the observation time, and obtaining the minimum packet signal amplitude average value among the frequency domain average amplitude values; updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet signal frequency domain average amplitude, and the minimum packet signal amplitude average value; and updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet signal frequency domain average amplitude, and the updated minimum packet signal amplitude average value after the observation period ends.

[0009] Optionally, dynamically determining the threshold ratio based on the packet error rate includes: setting a minimum threshold ratio and performing signal detection based on the minimum threshold ratio; and dynamically determining the threshold ratio based on the packet error rate detected by the signal.

[0010] Further, optionally, dynamically determining the threshold ratio based on the packet error rate detected by the signal includes: setting a minimum threshold ratio, a maximum threshold ratio, a maximum packet error rate, an observation period, and an observation time; setting the current threshold ratio as the minimum threshold ratio; acquiring the packet error rate within the observation time; determining the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the packet error rate; and updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the updated packet error rate after the observation period ends.

[0011] Secondly, embodiments of the present invention provide a signal adjustment apparatus, comprising: a detection module for detecting whether the location of narrowband interference is outside the band; a first adjustment module for enabling a notch filter when the location of narrowband interference is outside the band; and a second adjustment module for dynamically determining a threshold ratio by means of the detected minimum frequency domain average amplitude value or packet error rate when the location of narrowband interference is inside the band.

[0012] Optionally, the second adjustment module includes: a first adjustment unit, wherein the first adjustment unit includes: a first signal detection subunit, configured to enable a preset minimum threshold ratio and perform signal detection based on the preset minimum threshold ratio when the threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value; and a first adjustment subunit, configured to calculate the threshold ratio based on the minimum frequency domain average amplitude value in the packet signal detected by the signal.

[0013] Further, optionally, the first adjustment subunit is used to set the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, the observation period, and the observation time; set the current threshold ratio as the minimum threshold ratio; detect the average frequency domain amplitude of the received packet signal during the observation time, and obtain the average amplitude of the minimum packet signal in the average frequency domain amplitude; update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the average amplitude of the minimum packet signal; and update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset average frequency domain amplitude of the maximum packet signal, and the updated average amplitude of the minimum packet signal after the observation period ends.

[0014] Optionally, the second adjustment module further includes: a second adjustment unit, wherein the second adjustment unit includes: a second signal detection subunit, used to set a minimum threshold ratio when the threshold ratio is dynamically determined by the packet error rate, and to perform signal detection based on the minimum threshold ratio; and a second adjustment subunit, used to dynamically determine the threshold ratio based on the packet error rate detected by the signal.

[0015] Further, optionally, the second adjustment subunit is used to set the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, the observation period, and the observation time; set the current threshold ratio as the minimum threshold ratio; obtain the packet error rate during the observation time; determine the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the packet error rate; and update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the updated packet error rate after the observation period ends.

[0016] This invention provides a method and apparatus for signal adjustment. By detecting whether the location of narrowband interference is outside the band; when the location of narrowband interference is outside the band, a notch filter is activated; when the location of narrowband interference is inside the band, a threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value or packet error rate, thereby achieving the technical effects of improving data throughput, detecting and receiving packets with smaller signals, or reducing packet error rate. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a flowchart illustrating a signal adjustment method provided in Embodiment 1 of the present invention;

[0019] Figure 2This is a flowchart illustrating the process of adjusting a threshold ratio based on the detected minimum frequency domain average amplitude value in a signal adjustment method according to Embodiment 1 of the present invention.

[0020] Figure 3 This is a schematic diagram of the observation period and observation time in a signal adjustment method provided in Embodiment 1 of the present invention;

[0021] Figure 4 This is a schematic diagram illustrating the method for signal adjustment provided in Embodiment 1 of the present invention, which dynamically determines the threshold ratio by detecting the packet error rate;

[0022] Figure 5 This is a schematic diagram of a signal adjustment device provided in Embodiment 2 of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, rather than to limit a specific order.

[0025] It should also be noted that the various embodiments of the present invention described below can be executed individually or in combination with each other, and the embodiments of the present invention do not impose specific limitations in this regard.

[0026] Example 1

[0027] In a first aspect, embodiments of the present invention provide a signal adjustment method. Figure 1 This is a flowchart illustrating a signal adjustment method provided in Embodiment 1 of the present invention; as shown below. Figure 1 As shown, the signal adjustment method provided in this application embodiment includes:

[0028] Step 102: Detect whether the location of narrowband interference is outside the band.

[0029] Specifically, the initial threshold ratio is set to K. ratio Based on the initial threshold ratio, detect whether the location of the narrowband interference is outside the band. If yes, proceed to step S104; otherwise, proceed to step S106.

[0030] Step 104: When the narrowband interference is located outside the band, enable the notch filter;

[0031] In this embodiment, if the narrowband interference falls outside the band, enabling the notch filter will not attenuate the signal, and the minimum dynamic threshold ratio K is used. ratio =K ratio_min The aim is to eliminate as much out-of-band narrowband interference as possible, thereby increasing the detection rate and reception of small (weak) signal packets, and reducing the error rate of packets after demodulation.

[0032] Step 106: When the narrowband interference is located within the band, the threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value or packet error rate.

[0033] In this embodiment of the application, when the narrowband interference is located within the band, there are two methods for dynamically adjusting the threshold ratio, as follows:

[0034] Method 1: Calculate the threshold ratio based on the statistical results of the average amplitude value of the received packets in the frequency domain (referred to as packet average amplitude) over a period of time.

[0035] Optionally, dynamically determining the threshold ratio based on the detected minimum frequency domain average amplitude value includes: enabling a preset minimum threshold ratio and performing signal detection based on the preset minimum threshold ratio; and calculating the threshold ratio based on the minimum frequency domain average amplitude value in the detected packet signal.

[0036] Further, optionally, calculating the threshold ratio based on the minimum frequency domain average amplitude value in the detected packet signal includes: setting a minimum threshold ratio, a maximum threshold ratio, the maximum packet signal frequency domain average amplitude, an observation period, and an observation time; setting the current threshold ratio as the minimum threshold ratio; detecting the frequency domain average amplitude of the received packet signal during the observation time, and obtaining the minimum packet signal amplitude average value among the frequency domain average amplitude values; updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet signal frequency domain average amplitude, and the minimum packet signal amplitude average value; and updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet signal frequency domain average amplitude, and the updated minimum packet signal amplitude average value after the observation period ends.

[0037] Specifically, if the statistics are taken as an average, that is, the larger the average value of the received packet amplitude over a period of time, the weaker the impact of narrowband interference will be. Therefore, the threshold ratio can be increased, that is, the narrowband interference with low energy intensity is not detected, so as to avoid the activation of the notch filter due to the narrowband interference with low energy intensity, which would attenuate the packet signal. Thus, the signal-to-noise ratio can be increased to increase the data throughput of the packet signal.

[0038] When the statistical average value is low, it is more sensitive to the impact of narrowband interference. Therefore, a lower threshold value ratio is selected to detect narrowband interference with lower energy intensity as much as possible, and a notch filter is activated to avoid the impact of narrowband interference on the detection of smaller packet signals, so as to facilitate the detection and reception of smaller packet signals.

[0039] In the preferred example, the statistical method is not to use an average, but to determine the threshold ratio by recording the smallest observed average packet size over a period of time. Figure 2 As shown, Figure 2 This is a flowchart illustrating the process of adjusting a threshold ratio based on the detected minimum frequency domain average amplitude value in a signal adjustment method according to Embodiment 1 of the present invention.

[0040] Step 1: Set the minimum threshold ratio K ratio_min Maximum threshold ratio K ratio_max And the average frequency domain amplitude P of the maximum packet signal that can be received. max (That is, the average frequency domain amplitude of the maximum packet signal in this embodiment), two time parameters are set, namely the observation period T and the observation time OT, where T>OT, as shown. Figure 3 As shown, Figure 3 This is a schematic diagram of the observation period and observation time in a signal adjustment method provided in Embodiment 1 of the present invention. Statistics are performed within the observation time OT, and the threshold value ratio is updated after the time ends. Then, this fixed threshold value is maintained until the time reaches the observation period T.

[0041] In this embodiment of the application, a minimum threshold value ratio K is set. ratio_min Maximum threshold ratio K ratio_max And the average frequency domain amplitude P of the maximum packet signal that can be received. max Two time parameters are set, namely the observation period T and the observation time OT, which can be obtained from simulation or actual experience, to implement the signal adjustment method provided in the embodiments of this application, and are not specifically limited.

[0042] Step 2: Set the threshold value K ratio =K ratio_min (That is, in this embodiment of the application, the current threshold value ratio is set to the minimum threshold value ratio);

[0043] Step 3: Observe for a period of time (OT) and calculate the average frequency domain amplitude P of the received packet signal. avg This refers to the average packet width, and records the smallest average packet width P that has been observed. avg (That is, the minimum average packet signal amplitude in the embodiments of this application), denoted as P rec ;

[0044] Step 4: Based on the average amplitude P of the smallest received packet signal... rec The new threshold value is calculated (i.e., the threshold value ratio is updated based on the minimum threshold value ratio, the maximum threshold value ratio, the average frequency domain amplitude of the maximum packet signal, and the average amplitude of the minimum packet signal in this embodiment of the application). The calculation process is as follows:

[0045] K ratio =K ratio_min +(K ratio_max -K ratio_min )*P rec / P max ;

[0046] Step 5: If the observation period time T is reached, return to step 2 and continue repeating steps 3 to 5.

[0047] Method 2: Calculate the threshold ratio based on the packet error rate.

[0048] Optionally, dynamically determining the threshold ratio based on the packet error rate includes: setting a minimum threshold ratio and performing signal detection based on the minimum threshold ratio; and dynamically determining the threshold ratio based on the packet error rate detected by the signal.

[0049] Further, optionally, dynamically determining the threshold ratio based on the packet error rate detected by the signal includes: setting a minimum threshold ratio, a maximum threshold ratio, a maximum packet error rate, an observation period, and an observation time; setting the current threshold ratio as the minimum threshold ratio; acquiring the packet error rate within the observation time; determining the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the packet error rate; and updating the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the updated packet error rate after the observation period ends.

[0050] Specifically, if the packet error rate is high, it means that narrowband interference is affecting the reception of the packet signal. In this case, a lower threshold ratio can be selected to detect and eliminate narrowband interference with low energy intensity as much as possible, thereby reducing the packet error rate. If the packet error rate is low, the threshold ratio can be increased, that is, the narrowband interference with low energy intensity is not detected, avoiding the activation of the notch filter due to low-intensity narrowband interference, which would attenuate the packet signal. Therefore, the signal-to-noise ratio can be increased to increase the data throughput of the packet signal. Figure 4 This is a schematic diagram illustrating the dynamic determination of a threshold ratio by detecting packet error rate in a signal adjustment method provided in Embodiment 1 of the present invention. Specifically, as shown... Figure 4 As shown,

[0051] Step 1: Set the minimum threshold ratio K ratio_minMaximum threshold ratio K ratio_max And the default acceptable maximum packet error rate (i.e., the maximum packet error rate in the embodiments of this application) PER max The observation period T and the observation time OT are set, where T>OT; the above settings are obtained based on simulation or actual experience.

[0052] Step 2: Set the threshold value K ratio =K ratio_min (That is, in this embodiment of the application, the current threshold value ratio is set to the minimum threshold value ratio);

[0053] Step 3: Observe the OT (Over-the-Air) period and calculate the received packet error rate (PER). rec (That is, the packet error rate is obtained within the observation period in the embodiments of this application);

[0054] Step 4: Calculate a new threshold value based on the obtained packet error rate PER (i.e., in this embodiment, the threshold value ratio is determined based on the minimum threshold value ratio, the maximum threshold value ratio, the preset maximum packet error rate, and the packet error rate).

[0055] K ratio =K ratio_min +(K ratio_max -K ratio_min )*PER max / PER rec ;

[0056] Step 5: If the observation period T is reached, return to step 2 and continue to repeat steps 3 to 5 (that is, in this embodiment, after the observation period ends, the threshold ratio is updated based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the updated packet error rate).

[0057] In summary, existing technologies use fixed threshold values ​​to determine the presence of narrowband interference. When the threshold value is too high, low-energy narrowband interference may not be detected, resulting in weak signals never being detected or an increased packet error rate. When the threshold value is too low, low-energy narrowband interference that has no effect on the signal may activate a notch filter, causing significant attenuation of packet signals around the notch frequency, resulting in a worse signal-to-noise ratio and thus lower data throughput. Therefore, the signal adjustment method provided in this application dynamically adjusts the threshold value ratio based on the observed packet signal size or packet error rate, which can solve the problems of the prior art.

[0058] This invention provides a signal adjustment method. By detecting whether narrowband interference is located outside the band; when the narrowband interference is outside the band, a notch filter is activated; when the narrowband interference is inside the band, a threshold ratio is dynamically determined based on the detected minimum frequency domain average amplitude value or packet error rate. This achieves the technical effects of increasing data throughput, detecting and receiving packets with smaller signals, or reducing the packet error rate.

[0059] Example 2

[0060] Secondly, embodiments of the present invention provide a signal adjustment device. Figure 5 This is a schematic diagram of a signal adjustment device provided in Embodiment 2 of the present invention, as shown below. Figure 5 As shown, the signal adjustment device provided in this application embodiment includes: a detection module 52 for detecting whether the location of narrowband interference is outside the band; a first adjustment module 54 for enabling a notch filter when the location of narrowband interference is outside the band; and a second adjustment module 56 for dynamically determining a threshold ratio by means of the detected minimum frequency domain average amplitude value or packet error rate when the location of narrowband interference is inside the band.

[0061] Optionally, the second adjustment module 56 includes: a first adjustment unit, wherein the first adjustment unit includes: a first signal detection subunit, configured to enable a preset minimum threshold ratio and perform signal detection based on the preset minimum threshold ratio when the threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value; and a first adjustment subunit, configured to calculate the threshold ratio based on the minimum frequency domain average amplitude value in the packet signal detected by the signal.

[0062] Further, optionally, the first adjustment subunit is used to set the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, the observation period, and the observation time; set the current threshold ratio as the minimum threshold ratio; detect the average frequency domain amplitude of the received packet signal during the observation time, and obtain the average amplitude of the minimum packet signal in the average frequency domain amplitude; update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the average amplitude of the minimum packet signal; and update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset average frequency domain amplitude of the maximum packet signal, and the updated average amplitude of the minimum packet signal after the observation period ends.

[0063] Optionally, the second adjustment module 56 further includes: a second adjustment unit, wherein the second adjustment unit includes: a second signal detection subunit, used to set a minimum threshold ratio when the threshold ratio is dynamically determined by the packet error rate, and to perform signal detection based on the minimum threshold ratio; and a second adjustment subunit, used to dynamically determine the threshold ratio based on the packet error rate detected by the signal.

[0064] Further, optionally, the second adjustment subunit is used to set the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, the observation period, and the observation time; set the current threshold ratio as the minimum threshold ratio; obtain the packet error rate during the observation time; determine the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the packet error rate; and update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the preset maximum packet error rate, and the updated packet error rate after the observation period ends.

[0065] This invention provides a signal adjustment device. By detecting whether the location of narrowband interference is outside the band; when the narrowband interference is outside the band, a notch filter is activated; when the narrowband interference is inside the band, a threshold ratio is dynamically determined based on the detected minimum frequency domain average amplitude value or packet error rate. This achieves the technical effects of increasing data throughput, detecting and receiving packets with smaller signals, or reducing the packet error rate.

[0066] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0067] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0068] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A method for signal adjustment, characterized in that, include: Detect whether the location of narrowband interference is outside the band; When the narrowband interference is located outside the band, the notch filter is activated; When the narrowband interference is located within the band, the threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value or packet error rate. The threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value, including: Enable a preset minimum threshold ratio, and perform signal detection based on the preset minimum threshold ratio; The threshold ratio is calculated based on the minimum average amplitude value in the packet signal detected by the signal. The step of calculating the threshold ratio based on the minimum frequency domain average amplitude value in the packet signal detected by the signal includes: Set the minimum threshold ratio, maximum threshold ratio, average frequency domain amplitude of the maximum packet signal, observation period, and observation time; Set the current threshold ratio to the minimum threshold ratio; Within the observation period, the mean amplitude of the received packet signal in the frequency domain is detected, and the minimum mean amplitude of the packet signal among the mean amplitudes in the frequency domain is obtained. The threshold ratio is updated based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the average amplitude of the minimum packet signal. After the observation period ends, the threshold ratio is updated based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the updated average amplitude of the minimum packet signal. Dynamically determining the threshold ratio based on packet error rate includes: Set a minimum threshold ratio, and perform signal detection based on the minimum threshold ratio; The threshold ratio is dynamically determined based on the packet error rate detected by the signal. The step of dynamically determining the threshold ratio based on the packet error rate detected by the signal includes: setting a minimum threshold ratio, a maximum threshold ratio, a maximum packet error rate, an observation period, and an observation time; setting the current threshold ratio as the minimum threshold ratio; acquiring the packet error rate within the observation time; determining the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, and the packet error rate; and updating the threshold ratio after the observation period ends based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, and the updated packet error rate.

2. A signal adjustment device, characterized in that, include: The detection module is used to detect whether the location of narrowband interference is outside the band. The first adjustment module is used to enable the notch filter when the narrowband interference is located outside the band. The second adjustment module is used to dynamically determine the threshold ratio by the detected minimum frequency domain average amplitude value or packet error rate when the narrowband interference is located within the band. The second adjustment module includes: a first adjustment unit, wherein the first adjustment unit includes: The first signal detection subunit is used to enable a preset minimum threshold ratio and perform signal detection based on the preset minimum threshold ratio when the threshold ratio is dynamically determined by the detected minimum frequency domain average amplitude value; the first adjustment subunit is used to calculate the threshold ratio based on the minimum frequency domain average amplitude value in the packet signal detected by the signal. The first adjustment subunit is used to set a minimum threshold ratio, a maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, an observation period, and an observation time; set the current threshold ratio to the minimum threshold ratio; detect the average frequency domain amplitude of the received packet signal within the observation time, and obtain the average amplitude of the minimum packet signal among the average frequency domain amplitudes; update the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the average amplitude of the minimum packet signal; and update the threshold ratio after the observation period ends based on the minimum threshold ratio, the maximum threshold ratio, the average frequency domain amplitude of the maximum packet signal, and the updated average amplitude of the minimum packet signal. The second adjustment module further includes: a second adjustment unit, wherein the second adjustment unit includes: The second signal detection subunit is used to set a minimum threshold ratio when the threshold ratio is dynamically determined by the packet error rate, and to perform signal detection based on the minimum threshold ratio. The second adjustment subunit is used to dynamically determine the threshold value ratio based on the packet error rate detected by the signal. The second adjustment subunit is used to set a minimum threshold ratio, a maximum threshold ratio, a maximum packet error rate, an observation period, and an observation time; set the current threshold ratio to the minimum threshold ratio; obtain the packet error rate within the observation time; determine the threshold ratio based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, and the packet error rate; and update the threshold ratio after the observation period ends based on the minimum threshold ratio, the maximum threshold ratio, the maximum packet error rate, and the updated packet error rate.

Images