Signal detection system and communication device
By introducing first-stage and second-stage signal detection devices and a detection controller into the receiver, the problem of the receiver's lack of interference detection is solved, enabling accurate interference identification and control of the receiver and improving its performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYTERA COMM CORP
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-07
Smart Images
Figure CN224473305U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communications, and more particularly to a signal detection system and communication equipment. Background Technology
[0002] Intelligentization is a significant development trend in the professional wireless communication industry. As the "central" device in a professional wireless communication system, the repeater needs to quickly and accurately monitor and sense the environment in order to implement appropriate control strategies to improve the overall communication experience for customers. The receiver used is a superheterodyne receiver, and its architecture diagram is shown below. Figure 1 As shown, it includes: a bandpass filter (BPF1), a low-noise amplifier (LNA), a bandpass filter (BPF2), a mixer, a local oscillator (LO), an intermediate frequency filter (IF filter), an intermediate frequency amplifier (IF amplifier), and a demodulation integrated circuit (IC).
[0003] However, this receiver architecture lacks interference detection capabilities and cannot meet the intelligent detection requirements of professional wireless communication systems. Utility Model Content
[0004] The purpose of this application is to provide a signal detection system and communication device to solve the above-mentioned problems.
[0005] In a first aspect, this application provides a signal detection system applied to a receiver. The signal detection system includes a first-stage signal detection device connected to the input terminal of the receiver, used to perform first-stage detection on the input signal of the receiver to obtain a signal within a preset frequency range; a second-stage signal detection device connected to the input terminal of the receiver, used to perform second-stage detection on the input signal of the receiver to obtain information about the input signal; and a detection controller connected to both the first-stage and second-stage signal detection devices, used to obtain the signal within the preset frequency range from the first-stage signal detection device, obtain the information about the input signal from the second-stage signal detection device, and determine an interference signal and the interference category of the interference signal based on the information about the input signal and the signal within the preset frequency range; wherein, the detection controller is also connected to the output terminal of the receiver, used to obtain information about the output signal of the receiver from the output terminal of the receiver.
[0006] In a second aspect, this application provides a communication device, including a receiver and a signal detection system as described in the first aspect above.
[0007] In the technical solution of this application, the input signal received by the receiver is detected by a first-level signal detection device to obtain the signal within a preset frequency range; the input signal is detected by a second-level signal detection device to obtain the information of the input signal; the detection controller determines the interference signal and the interference type of the interference signal based on the information of the input signal and the signal within the preset frequency range, thereby achieving accurate detection. Furthermore, the detection controller can obtain the information of the receiver's output signal, especially in complex scenarios where multiple interferences coexist, enabling precise control of the receiver. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0009] Figure 1 This is a schematic diagram of the receiver structure in related technologies;
[0010] Figure 2 This is a schematic diagram of the structure of an embodiment of the signal detection system provided in this application;
[0011] Figure 3 This is a partial structural schematic diagram of an embodiment of the signal detection system provided in this application;
[0012] Figure 4 This is a partial structural schematic diagram of an embodiment of the signal detection system provided in this application;
[0013] Figure 5 This is a partial structural schematic diagram of an embodiment of the signal detection system provided in this application;
[0014] Figure 6 A schematic diagram of the structure of an embodiment of the communication device provided in this application;
[0015] Figure 7 Another structural schematic diagram of an embodiment of the communication device provided in this application;
[0016] Figure 8 This is another structural schematic diagram of an embodiment of the signal detection system provided in this application;
[0017] Figure 9 Another structural schematic diagram of an embodiment of the communication device provided in this application;
[0018] Figure 10 A schematic diagram of the structure of an embodiment of the receiver provided in this application;
[0019] Figure 11 This is a flowchart illustrating an embodiment of the receiving method provided in this application. Detailed Implementation
[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0024] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0025] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0027] As mentioned above, the current receiver architecture does not have interference detection capabilities.
[0028] Therefore, this application provides a signal detection system, communication device, and receiving method to solve the above problems.
[0029] Please refer to Figure 2 , Figure 2 This is a schematic diagram of an embodiment of the signal detection system provided in this application. The signal detection system 10 is applied to a receiver 20 and includes a first-stage signal detection device 11, a second-stage signal detection device 12, and a detection controller 13. The first-stage signal detection device 11 is connected to the input terminal of the receiver 20 and is used to perform first-stage detection on the input signal of the receiver 20 to obtain a signal within a preset frequency range. The second-stage signal detection device 12 is connected to the input terminal of the receiver 20 and is used to perform second-stage detection on the input signal of the receiver 20 to obtain information about the input signal. The detection controller 13 is connected to both the first-stage signal detection device 11 and the second-stage signal detection device 12, and is used to obtain a signal within the preset frequency range from the first-stage signal detection device 11, obtain information about the input signal from the second-stage signal detection device 12, and determine an interference signal and its interference category based on the information about the input signal and the signal within the preset frequency range. The detection controller 13 is also connected to the output terminal of the receiver 20 and is used to obtain information about the input signal of the receiver 20 from the output terminal of the receiver 20.
[0030] Receiver 20 can be a superheterodyne receiver, for example... Figure 1 The receiver 20 is a superheterodyne receiver; however, receiver 20 can also be other types of receivers, such as a low-intermediate frequency (IF) receiver. The input signal to receiver 20 can be the signal received by the antenna corresponding to receiver 20, passed through the bandpass filter and low-noise amplifier of receiver 20. That is, the input terminal of receiver 20 is located after the low-noise amplifier of receiver 20. Alternatively, the input terminal of receiver 20 can also be located before the bandpass filter of receiver 20.
[0031] Both the first-stage signal detection device 11 and the second-stage signal detection device 12 are connected to the input terminal of the receiver 20. For example, the first-stage signal detection device 11 and the second-stage signal detection device 12 can be coupled to the input terminal of the receiver 20, thus both the first-stage signal detection device 11 and the second-stage signal detection device 12 are coupled to the input terminal of the receiver 20. For example, the first-stage signal detection device 11 and the second-stage signal detection device 12 can be coupled to the input terminal of the receiver 20 through a coupler.
[0032] The first-level signal detection device 11 performs first-level detection on the input signal of the receiver 20 to obtain the signal within a preset frequency range. The second-level signal detection device 12 is used to perform second-level detection on the input signal of the receiver 20 to obtain the information of the input signal. The information of the input signal may include the frequency and amplitude of the input signal, and the input signal may include the main signal (also called the received signal) that the receiver 20 wants to receive, as well as possible interference signals.
[0033] Based on the information of the input signal and the signal within a preset frequency range, for example, the information of the input signal may be the frequency and amplitude of possible interference signals, as well as the frequency and amplitude of the main signal, the detection controller 13 determines the interference signal and the interference type of the interference signal, such as spurious interference, intermodulation interference, or blocking interference. Among these, spurious interference, intermodulation interference, and blocking interference are understood by those skilled in the art and will not be described in detail here.
[0034] The output signal of receiver 20 can be the signal output by the demodulation integrated circuit of receiver 20. That is to say, the output terminal of receiver 20 is located after the demodulation integrated circuit of receiver 20, or the output terminal of receiver 20 is the output terminal of the demodulation integrated circuit of receiver 20.
[0035] The detection controller 13 obtains information about the output signal of the receiver 20 from the output terminal of the receiver 20. The output signal of the receiver 20 can refer to the main signal (also called the received signal) that the receiver 20 wants to receive. The information of the output signal can include at least the RSSI signal strength and the synchronization word error rate of the received signal. This information is used to determine whether to control the receiver 20, such as local oscillator current control, high and low local oscillator switching, limiting module switching, gain adjustment, etc., thereby realizing the switching of the operating mode of the receiver 20 and improving the performance of the receiver 20.
[0036] In the above scheme, a first-stage signal detection device performs primary detection on the input signal received by the receiver to obtain the signal within a preset frequency range; a second-stage signal detection device performs secondary detection on the input signal to obtain the input signal information; the detection controller determines the interference signal and its interference type based on the input signal information and the signal within the preset frequency range, thereby achieving accurate detection, especially in complex scenarios where multiple interferences coexist. Furthermore, by obtaining the receiver's output signal information through the detection controller, precise control of the receiver 20 can be achieved.
[0037] In some embodiments, the detection controller 13 is further configured to send a start command to the second-level signal detection device 12 in response to a voltage corresponding to a signal within a preset frequency range being greater than or equal to a preset voltage value, so that the second-level signal detection device 12 starts in response to the start command and performs secondary detection on the input signal of the receiver 20.
[0038] The voltage corresponding to the signal within the preset frequency range is detected by the first-level signal detection device 11. When the voltage corresponding to the signal within the preset frequency range is greater than or equal to the preset voltage value, the detection controller 13 sends a start command to the second-level signal detection device 12. The second-level signal detection device 12 responds to the start command and starts to perform secondary detection. That is, the second-level signal detection device 12 is initially in standby mode, and the voltage corresponding to the signal within the preset frequency range detected by the first-level signal detection device 11 is used to wake up the second-level signal detection device 12 to perform secondary detection.
[0039] In some embodiments, please refer to Figure 3 , Figure 3 This is a partial structural schematic diagram of an embodiment of the signal detection system provided in this application. The first-level signal detection device 11 includes at least one signal detection circuit 401. Each signal detection circuit 401 includes a filter a and a detector tube b. The input terminal of the filter a is connected to the input terminal of the receiver 20, and the output terminal of the filter a is connected to the detector tube b.
[0040] The input of filter a is connected to the input of receiver 20. For example, the input of filter a can be coupled to the input of receiver 20. Filter a may include a bandpass filter corresponding to a preset frequency range, so that the first-stage signal detection device 11 can detect signals within the preset frequency range. For example, when the preset frequency range is 400MHz-420MHz, a bandpass filter with a lower cutoff frequency of 400MHz and an upper cutoff frequency of 420MHz can be selected. Of course, filter a may also include other types of filters, as long as the preset frequency range can be detected.
[0041] Detector tube b is used to convert the signal within a preset frequency range that has passed through filter a into a voltage. Therefore, the signal strength can be determined by the voltage output from detector tube b. A higher voltage indicates a stronger signal, and vice versa.
[0042] The filter frequency range of filter a in at least one signal detection circuit 401 can be set to different values, so that the preset frequency range can be determined by comparing the voltage output by detector tube b.
[0043] In some embodiments, please refer to Figure 4 , Figure 4 This is a partial structural diagram of an embodiment of the signal detection system provided in this application. At least one signal detection circuit may include a first signal detection circuit 501 and a second signal detection circuit 502, wherein the filter frequency ranges corresponding to the first signal detection circuit 501 and the second signal detection circuit 502 are different.
[0044] The filter frequency range of the filter 501a of the first signal detection circuit 501 and the filter frequency range of the filter 502a of the second signal detection circuit 502 can be set to be different. Therefore, the preset frequency range can be determined by comparing the voltage output by the detector tube 501b of the first signal detection circuit 501 and the detector tube 501b of the second signal detection circuit 502.
[0045] For example, the first signal detection circuit 501 can be configured to detect signals within a first frequency range; for instance, the frequency range of filter 501a can be set to 50MHz-150MHz. The second signal detection circuit 502 can be configured to detect signals within a second frequency range; for instance, the frequency range of filter 502b can be set to 150MHz-250MHz. When the receiver 20 receives an input signal, the input signal is first pre-filtered by filters 501a and 502a. Subsequently, the detector tubes 501b and 502b corresponding to filters 501a and 502a respectively detect the voltage of the filtered signal. If the voltage detected at the output of filter 501a is higher than the voltage detected at the output of filter 501b, it can be determined that the signal is within the frequency range of filter 501a, that is, within the range of 50MHz-150MHz. In this case, 50MHz-150MHz (the first frequency range) is the preset frequency range. Similarly, when the voltage detected at the output terminal of filter 501b is higher than the voltage detected at the output terminal of filter 501a, it can be determined that the signal is within the frequency range of filter 501b, that is, within the range of 150MHz-250MHz. At this time, 150MHz-250MHz (the second frequency range) is the preset frequency range.
[0046] In some embodiments, please refer to Figure 5 , Figure 5 This is a partial structural diagram of an embodiment of the signal detection system provided in this application. The second-level signal detection device 12 includes an auxiliary receiver 121, the input terminal of which is connected to the input terminal of the receiver 20, and the output terminal of the auxiliary receiver 121 is connected to the detection controller 13. The information of the input signal includes the amplitude and frequency of the input signal.
[0047] The input of the auxiliary receiver 121 is connected to the input of the receiver 20; for example, the input of the auxiliary receiver 121 is coupled to the input of the receiver 20. The architecture of the auxiliary receiver 121 can be the same as that of the receiver 20, but the specific components in the architecture of the auxiliary receiver 121 can be different from those in the architecture of the receiver 20.
[0048] The auxiliary receiver 121 is used to perform secondary detection on the input signal of the receiver 20 to obtain information about the input signal. The auxiliary receiver 121 initially operates in standby mode. The voltage corresponding to the signal within a preset frequency range detected by the first-stage signal detection device 11 is used to wake up the auxiliary receiver 121 for secondary detection. For example, when the voltage corresponding to the signal within the preset frequency range is greater than or equal to a preset voltage value, the detection controller 13 sends a start command to the auxiliary receiver 121, and the auxiliary receiver 121 starts to perform secondary detection in response to the start command.
[0049] Since the output of the auxiliary receiver 121 is connected to the detection controller 13, the information of the input signal output by the auxiliary receiver 121 can be sent to the detection controller 13. The input signal information may include the frequency and amplitude of the input signal, and the input signal may include the main signal (also called the received signal) to be received by the receiver 20, as well as possible interference signals. Therefore, based on the input signal information and signals within a preset frequency range—for example, the input signal information may include the frequency and amplitude of possible interference signals, and the frequency and amplitude of the main signal—the detection controller 13 determines the interference type of the interference signal.
[0050] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic diagram of an embodiment of the communication device provided in this application. The communication device 1 includes a receiver 20 and a signal detection system 10 in any of the above embodiments.
[0051] Communication device 1 can be a repeater or similar product in a professional wireless communication system. Receiver 20 and signal detection system 10 have been described in detail in the above embodiments; please refer to the relevant embodiments above for details, and they will not be repeated here.
[0052] In the above scheme, a first-stage signal detection device performs primary detection on the input signal received by the receiver to obtain the signal within a preset frequency range; a second-stage signal detection device performs secondary detection on the input signal to obtain the input signal information; the detection controller determines the interference signal and its interference type based on the input signal information and the signal within the preset frequency range, thereby achieving accurate detection, especially in complex scenarios where multiple interferences coexist. Furthermore, by obtaining the receiver's output signal information through the detection controller, precise control of the receiver 20 can be achieved.
[0053] In some embodiments, please refer to Figure 7 , Figure 7 This is another schematic diagram of an embodiment of the communication device provided in this application. The communication device 1 may further include a receiver controller 30. The receiver controller 30 is connected to the receiver 20 and is used to obtain information about the interference type of the interference signal and the output signal of the receiver 20 from the detection controller 13, and to control the receiver 20 according to the interference type of the interference signal in response to the information about the output signal of the receiver 20 satisfying a preset condition.
[0054] The receiver controller 30 obtains the type of interference signal from the detection controller 13, such as spurious interference, intermodulation interference, or jamming interference.
[0055] The output signal of receiver 20 can refer to the main signal (also called the received signal) that receiver 20 wants to receive. The information in the output signal can include at least the RSSI signal strength and synchronization word error rate of the received signal, which is used to determine whether receiver 20 should be controlled by receiver controller 30. For example, communication device 1 is initially in normal mode. When the RSSI signal strength and / or synchronization word error rate of the received signal of receiver 20 meet the preset conditions, communication device 1 switches to performance mode. At this time, receiver controller 30 performs local oscillator current control, high and low local oscillator switching, limiting module switching, gain adjustment, etc., on receiver 20. It can be seen that the switching of the operating mode of receiver 20 is realized, thereby improving the performance of receiver 20.
[0056] In some embodiments, please refer to Figure 8 , Figure 8 This is another schematic diagram of an embodiment of the signal detection system provided in this application. Based on Figure 2 The signal detection system 10 may further include a receiver controller 14. The receiver controller 14 is connected to the detection controller 13 and the receiver 20, and is used to obtain information about the interference type of the interference signal and the output signal of the receiver 20 from the detection controller 13, and control the receiver 20 according to the interference type of the interference signal in response to the information about the output signal of the receiver 20 satisfying preset conditions.
[0057] The receiver controller 14 is the same as the receiver controller 30 in the above embodiments, which has been described in detail in the above embodiments. Please refer to the relevant embodiments above for details, and it will not be repeated here.
[0058] The signal detection system 10 can be an integrated chip to integrate the first-level signal detection device 11, the second-level signal detection device 12, the detection controller 13, and the receiver controller 14.
[0059] In some embodiments, please refer to Figure 9 , Figure 9 This is a schematic diagram of an embodiment of the communication device provided in this application. The communication device 1 may include a receiver 20 and, for example, a receiver 20 and a receiver 20. Figure 8 The signal detection system 10 is shown. It is understood that when the receiver controller 14 is integrated into the signal detection system 10, the signal detection system, in addition to detecting and analyzing interference signals in the input signal of the receiver 20, can also control the receiver 20 through the receiver controller 14. For example, when the RSSI signal strength and / or synchronization word error rate of the received signal meet preset conditions, the receiver controller 14 performs local oscillator current control, high / low local oscillator switching, limiting module switching, gain adjustment, etc., on the receiver 20, thereby switching the operating mode of the receiver 20 and improving the performance of the receiver 20.
[0060] In some embodiments, please refer to Figure 10 , Figure 10 This is a schematic diagram of a receiver embodiment provided in this application. The receiver 20 may include a mixer 201 and a local oscillator 202. The first input terminal of the mixer 201 serves as the input terminal of the receiver 20, and the second input terminal of the mixer 201 is connected to the local oscillator 202. In response to the interference signal being classified as spurious interference, the receiver controller 14 or receiver controller 30 may switch the local oscillator frequency of the local oscillator 202.
[0061] The first input terminal of mixer 201 serves as the input terminal of receiver 20, and the second input terminal of mixer 201 is connected to local oscillator 202. Mixer 201 mixes the local oscillation signal generated by local oscillator 202 with the received signal of receiver 20, thereby converting the frequency of the input signal to intermediate frequency.
[0062] Spurious interference can increase the bit error rate and affect signal reception. When the interference signal detected by the detection controller 13 is classified as spurious interference, the receiver controller 14 or the receiver controller 30 can switch the local oscillator frequency of the local oscillator 202, for example, by switching between high and low local oscillator frequencies, thereby reducing the impact on signal reception.
[0063] In some embodiments, please continue reading Figure 10 The receiver 20 may further include an intermediate frequency (IF) filter 203 and a limiting circuit 204. The limiting circuit 204 may include a first limiting sub-circuit 2041 and a second limiting sub-circuit 2042. The input terminal of the IF filter 203 is connected to the output terminal of the mixer 201, and the first and second limiting sub-circuits are connected to the output terminal of the IF filter 203 via a first switch S1. In response to the interference signal being classified as intermodulation interference, the receiver controller 14 or receiver controller 30 may control the local oscillator current of the local oscillator 202 and / or switch the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042.
[0064] The input terminal of the intermediate frequency filter 203 is connected to the output terminal of the mixer 201. Therefore, the intermediate frequency filter 203 can filter the intermediate frequency signal after mixing to further filter out unwanted frequencies.
[0065] The first limiting sub-circuit 2041 includes an amplifier 2041a and a limiter 2041b to perform signal amplification and limiting functions. Specifically, the amplifier 2041a first amplifies the signal after passing through the intermediate frequency filter 203 to increase the signal strength, and then the limiter 2041b limits the signal amplitude to prevent the signal amplitude from being too large and exceeding the processing range of subsequent circuits.
[0066] The second limiting sub-circuit 2042 may include a limiting transistor 2042a and an attenuator 2042b. Specifically, the limiting transistor 2042a is mainly used to limit the peak value of the signal. When the signal amplitude exceeds the threshold set by the limiting transistor 2042a, the limiting transistor 2042a will conduct, limiting the signal amplitude within a certain range. The attenuator 2042b further attenuates the signal amplitude, making the signal amplitude more suitable for subsequent circuit processing.
[0067] Intermodulation interference can manifest itself in various ways, including the generation of intermodulation products due to the nonlinear characteristics of circuit components. For example, when multiple signals enter mixer 201 simultaneously, the mixer 201 may generate intermodulation products while processing these signals. For instance, when the interference signal detected by the controller 13 is classified as intermodulation interference, the receiver controller 14 or receiver controller 30 can adjust the local oscillator current of the local oscillator 202, thereby changing the power of the output signal. As another example, when the interference signal detected by the controller 13 is classified as intermodulation interference, the receiver controller 14 or receiver controller 30 can switch between the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042, i.e., control the first switch S1 to connect to either the first limiting sub-circuit 2041 or the second limiting sub-circuit 2042, thus switching from the first limiting sub-circuit 2041 to the second limiting sub-circuit 2042, or vice versa. For example, when the interference signal obtained by the detection controller 13 is of the type of intermodulation interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202 and switch the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042.
[0068] In some embodiments, please continue reading Figure 10 The receiver 20 may further include a demodulation circuit 205. The input of the demodulation circuit 205 is connected to the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042 via a second switch S2, and the output of the demodulation circuit 205 serves as the output of the receiver 20. In response to the interference signal being classified as jamming interference, the receiver controller 14 or receiver controller 30 may control the local oscillator current of the local oscillator 202 and / or control the gain of the demodulation circuit 205.
[0069] The demodulation circuit 205 is used to demodulate the information of the output signal, which may include information about the RSSI signal strength and the synchronization word error rate of the received signal.
[0070] Specific manifestations of jamming interference can include strong interference signals causing receiver overload and saturation, thus degrading the receiver's signal reception capability. For example, when the interference signal detected by the controller 13 is classified as jamming interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202, thereby changing the power of the local oscillator signal generated by the local oscillator 202. This can reduce the impact of strong interference signals on the receiver 20, enabling the receiver 20 to operate normally in a strong interference environment. As another example, when the interference signal detected by the controller 13 is classified as jamming interference, the receiver controller 14 or the receiver controller 30 can control the gain of the demodulation circuit 205. In this case, the gain can be appropriately reduced based on the characteristics of the signal and the interference. For example, when the interference is strong, the gain can be appropriately reduced to avoid excessive amplification of the interference signal; conversely, when the useful signal is strong, the gain can be reasonably increased to obtain a better demodulation effect. For example, when the detection controller 13 obtains that the interference signal is a blocking interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202 and control the gain of the demodulation circuit 205.
[0071] It should be noted that, Figure 10 The receiver 20 may further include a first bandpass filter, a low-noise amplifier, and a second bandpass filter (not shown in the figure) connected in sequence. The input terminal of the receiver 20 may be located after the low-noise amplifier or before the second bandpass filter. The first bandpass filter, the low-noise amplifier, and the second bandpass filter are understood by those skilled in the art and will not be described in detail here.
[0072] In some embodiments, when the information of the output signal of the receiver 20 meets the preset conditions, the receiver controller 14 or the receiver controller 30 can switch from the first mode to the second mode, thereby controlling the receiver 20 according to the interference category of the interference signal.
[0073] The first mode can be the normal mode, and the second mode can be the performance mode. The receiver controller 14 or the receiver controller 30 is in the first mode or the second mode, that is, the receiver 20 is in the first mode or the second mode, or the communication device 1 is in the first mode or the second mode.
[0074] Communication device 1 is powered on and enters normal mode. At this time, receiver 20 and the first-level signal detection device 11 operate. The first-level signal detection device 11 continuously detects the input signal, performing primary detection. When the detected signal voltage reaches a preset voltage value, the detection controller 13 wakes up the second-level signal detection device 12 to perform secondary detection. The detection controller 13 obtains signals within a preset frequency range from the first-level signal detection device 11 and input signal information from the second-level signal detection device 12. Based on the input signal information and the signals within the preset frequency range, it determines the interference signal and its interference type. Receiver controller 14 or receiver controller 30 obtains the interference type and receiver output signal information from the detection controller 13. In response to the receiver output signal information meeting preset conditions, receiver controller 14 or receiver controller 30 switches from normal mode to performance mode, i.e., enters performance mode.
[0075] In performance mode, receiver controller 14 or receiver controller 30 controls receiver 20 based on the type of interference signal. For example, if the interference type is determined to be spurious interference, receiver controller 14 or receiver controller 30 can switch the local oscillator frequency of the local oscillator. If the interference type is determined to be intermodulation interference, receiver controller 14 or receiver controller 30 can adjust the local oscillator current of local oscillator 202 and / or switch the limiting circuit; if the interference type is determined to be blocking interference, receiver controller 14 or receiver controller 30 can control the local oscillator current of local oscillator 202 and / or control the gain of demodulation circuit 205.
[0076] Please refer to Figure 11 , Figure 11 This is a flowchart illustrating an embodiment of the receiving method provided in this application. The receiving method is applied to the receiver 20 described above and specifically includes the following steps.
[0077] In step S1202, the first-level signal detection device 11 performs first-level detection on the input signal of the receiver 20 to obtain the signal within the preset frequency range.
[0078] In step S1204, the second-level signal detection device 12 performs secondary detection on the input signal of the receiver 20 to obtain the information of the input signal.
[0079] In step S1206, the detection controller 13 determines the interference signal and the interference type of the interference signal based on the information of the input signal and the signal within the preset frequency range, and obtains the information of the output signal of the receiver 20.
[0080] Receiver 20 can be a superheterodyne receiver, for example... Figure 1The receiver 20 is a superheterodyne receiver; however, receiver 20 can also be other types of receivers, such as a low-intermediate frequency (IF) receiver. The input signal to receiver 20 can be the signal received by the antenna corresponding to receiver 20, passed through the bandpass filter and low-noise amplifier of receiver 20. That is, the input terminal of receiver 20 is located after the low-noise amplifier of receiver 20. Alternatively, the input terminal of receiver 20 can also be located before the bandpass filter of receiver 20.
[0081] Both the first-stage signal detection device 11 and the second-stage signal detection device 12 are connected to the input terminal of the receiver 20. For example, the first-stage signal detection device 11 and the second-stage signal detection device 12 can be coupled to the input terminal of the receiver 20, thus both the first-stage signal detection device 11 and the second-stage signal detection device 12 are coupled to the input terminal of the receiver 20. For example, the first-stage signal detection device 11 and the second-stage signal detection device 12 can be coupled to the input terminal of the receiver 20 through a coupler.
[0082] The first-level signal detection device 11 performs first-level detection on the input signal of the receiver 20 to obtain the signal within a preset frequency range. The second-level signal detection device 12 is used to perform second-level detection on the input signal of the receiver 20 to obtain the information of the input signal. The information of the input signal may include the frequency and amplitude of the input signal, and the input signal may include the main signal (also called the received signal) that the receiver 20 wants to receive, as well as possible interference signals.
[0083] Based on the information of the input signal and the signal within a preset frequency range, for example, the information of the input signal may be the frequency and amplitude of the interference signal and the frequency and amplitude of the main signal, the detection controller 13 determines the interference signal and the type of interference, such as spurious interference, intermodulation interference, or blocking interference. Spurious interference, intermodulation interference, and blocking interference are understood by those skilled in the art and will not be described in detail here.
[0084] The output signal of receiver 20 can be the signal output by the demodulation integrated circuit of receiver 20. That is to say, the output terminal of receiver 20 is located after the demodulation integrated circuit of receiver 20, or the output terminal of receiver 20 is the output terminal of the demodulation integrated circuit of receiver 20.
[0085] The detection controller 13 obtains information about the output signal of the receiver 20 from the output terminal of the receiver 20. The output signal of the receiver 20 can refer to the main signal (also called the received signal) that the receiver 20 wants to receive. The information of the output signal can include at least the RSSI signal strength and the synchronization word error rate of the received signal. This information is used to determine whether to control the receiver 20, such as local oscillator current control, high and low local oscillator switching, limiting module switching, gain adjustment, etc., thereby realizing the switching of the operating mode of the receiver 20 and improving the performance of the receiver 20.
[0086] In the above scheme, a first-stage signal detection device performs primary detection on the input signal received by the receiver to obtain the signal within a preset frequency range; a second-stage signal detection device performs secondary detection on the input signal to obtain the input signal information; the detection controller determines the interference signal and its interference type based on the input signal information and the signal within the preset frequency range, thereby achieving accurate detection, especially in complex scenarios with multiple interferences. Furthermore, by obtaining the receiver's output signal information through the detection controller, precise control of the receiver 20 can be achieved.
[0087] In some embodiments, step S1204, which involves performing secondary detection on the input of the receiver 20 to obtain information about the input signal, includes the following steps.
[0088] When the voltage corresponding to a signal within a preset frequency range is greater than or equal to a preset voltage value, the second-level signal detection device 12 performs secondary detection on the input signal of the receiver to obtain the information of the input signal.
[0089] The voltage corresponding to the signal within the preset frequency range is detected by the first-level signal detection device 11. When the voltage corresponding to the signal within the preset frequency range is greater than or equal to the preset voltage value, the detection controller 13 sends a start command to the second-level signal detection device 12. The second-level signal detection device 12 responds to the start command and starts to perform secondary detection. That is, the second-level signal detection device 12 is initially in standby mode, and the voltage corresponding to the signal within the preset frequency range detected by the first-level signal detection device 11 is used to wake up the second-level signal detection device 12 to perform secondary detection.
[0090] In some embodiments, the receiving method may further include responding to the information of the output signal of the receiver 20 satisfying a preset condition, and the receiver controller 30 controlling the receiver according to the interference category of the interference signal.
[0091] The receiver controller 30 obtains the type of interference signal from the detection controller 13, such as spurious interference, intermodulation interference, or jamming interference.
[0092] The output signal of receiver 20 can refer to the main signal (also called the received signal) that receiver 20 wants to receive. The information in the output signal can include at least the RSSI signal strength and synchronization word error rate of the received signal, which is used to determine whether receiver 20 should be controlled by receiver controller 30. For example, communication device 1 is initially in normal mode. When the RSSI signal strength and / or synchronization word error rate of the received signal of receiver 20 meet the preset conditions, communication device 1 switches to performance mode. At this time, receiver controller 30 performs local oscillator current control, high and low local oscillator switching, limiting module switching, gain adjustment, etc., on receiver 20. It can be seen that the switching of the operating mode of receiver 20 is realized, thereby improving the performance of receiver 20.
[0093] In some embodiments, the information of the output signal of the receiver 20 includes at least the RSSI signal strength corresponding to the output signal and the bit error rate of the synchronization word corresponding to the output signal.
[0094] The information in the receiver's 20 output signal meets preset conditions, including:
[0095] The RSSI signal strength corresponding to the output signal is less than the first preset signal strength; or
[0096] The RSSI signal strength corresponding to the output signal is greater than the second preset signal strength, and the bit error rate of the synchronization word corresponding to the output signal is greater than the preset bit error rate.
[0097] RSSI signal strength refers to the strength of the received signal received by receiver 20, and synchronization word error rate refers to the ratio of the probability of an error in the synchronization word to the total number of synchronization words transmitted.
[0098] When the RSSI signal strength corresponding to the output signal is less than the first preset signal strength, for example, when the signal source of the received signal received by the receiver 20 is far away from the receiver 20, the RSSI signal strength is small, that is, the impact caused by the interference signal will be relatively large, so it is necessary to control the reception of the receiver 20.
[0099] When the RSSI signal strength corresponding to the input signal is greater than the second preset signal strength, for example, when the signal source of the received signal received by receiver 20 is close to receiver 20, the RSSI signal strength is high, meaning the impact of interference signals is relatively small. Therefore, further judgment is needed based on the synchronization word error rate. When the synchronization word error rate corresponding to the input signal is greater than the preset error rate, for example, when noise, interference, attenuation, or other factors cause poor reception of receiver 20 during signal transmission, it is necessary to control the reception of receiver 20.
[0100] In some embodiments, receiver 20 may include mixer 201 and local oscillator 202, wherein a first input terminal of mixer 201 serves as an input terminal of receiver 20, and a second input terminal is connected to local oscillator 202.
[0101] The receiver controller 30 controls the receiver 20 according to the type of interference signal, including:
[0102] In response to the interference signal being classified as spurious interference, the receiver controller 30 switches the local oscillator frequency of the local oscillator 202.
[0103] The first output terminal of mixer 201 serves as the input terminal of receiver 20, and the second output terminal of mixer 201 is connected to local oscillator 202. Mixer 201 mixes the local oscillation signal generated by local oscillator 202 with the received signal of receiver 20, thereby converting the frequency of the input signal to intermediate frequency.
[0104] Spurious interference can increase the bit error rate and affect signal reception. When the interference signal detected by the detection controller 13 is classified as spurious interference, the receiver controller 14 or the receiver controller 30 can switch the local oscillator frequency of the local oscillator 202, for example, by switching between high and low local oscillator frequencies, thereby reducing the impact on signal reception.
[0105] In some embodiments, the receiver 20 may further include an intermediate frequency filter 203 and a limiting circuit 204, wherein the limiting circuit 204 includes a first limiting sub-circuit and a second limiting sub-circuit, the input terminal of the intermediate frequency filter 203 is connected to the output terminal of the mixer 201, and the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042 are connected to the output terminal of the intermediate frequency filter 203 via a first switch.
[0106] The receiver controller 30 controls the receiver 20 according to the type of interference signal, including:
[0107] In response to the interference signal being classified as intermodulation interference, the receiver controller 30 controls the local oscillator current of the local oscillator 202 and / or switches the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042.
[0108] The input terminal of the intermediate frequency filter 203 is connected to the output terminal of the mixer 201. Therefore, the intermediate frequency filter 203 can filter the intermediate frequency signal after mixing to further filter out unwanted frequencies.
[0109] The first limiting sub-circuit 2041 includes an amplifier 2041a and a limiter 2041b to perform signal amplification and limiting functions. Specifically, the amplifier 2041a first amplifies the signal after passing through the intermediate frequency filter 203 to increase the signal strength, and then the limiter 2041b limits the signal amplitude to prevent the signal amplitude from being too large and exceeding the processing range of subsequent circuits.
[0110] The second limiting sub-circuit 2042 may include a limiting transistor 2042a and an attenuator 2042b. Specifically, the limiting transistor 2042a is mainly used to limit the peak value of the signal. When the signal amplitude exceeds the threshold set by the limiting transistor 2042a, the limiting transistor 2042a will conduct, limiting the signal amplitude within a certain range. The attenuator 2042b further attenuates the signal amplitude, making the signal amplitude more suitable for subsequent circuit processing.
[0111] Intermodulation interference can manifest itself in various ways, including the generation of intermodulation products due to the nonlinear characteristics of circuit components. For example, when multiple signals enter mixer 201 simultaneously, the mixer 201 may generate intermodulation products while processing these signals. For instance, when the interference signal detected by the controller 13 is classified as intermodulation interference, the receiver controller 14 or receiver controller 30 can adjust the local oscillator current of the local oscillator 202, thereby changing the power of the output signal. As another example, when the interference signal detected by the controller 13 is classified as intermodulation interference, the receiver controller 14 or receiver controller 30 can switch between the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042, i.e., control the first switch S1 to connect to either the first limiting sub-circuit 2041 or the second limiting sub-circuit 2042, thus switching from the first limiting sub-circuit 2041 to the second limiting sub-circuit 2042, or vice versa. For example, when the interference signal obtained by the detection controller 13 is of the type of intermodulation interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202 and switch the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042.
[0112] In some embodiments, the receiver 20 may further include a demodulation circuit 205, wherein the input terminal of the demodulation circuit 205 is connected to the first limiting sub-circuit 2041 and the second limiting sub-circuit 2042 via the second switch S2, and the output terminal serves as the output terminal of the receiver 20.
[0113] The receiver controller 30 controls the receiver 20 according to the interference type of the pre-interference signal, including:
[0114] In response to the interference signal being classified as jamming interference, the receiver controller 30 controls the local oscillator current of the local oscillator 202 and / or the gain of the demodulation circuit 205.
[0115] The demodulation circuit 205 is used to demodulate the information of the output signal, which may include information about the RSSI signal strength and the synchronization word error rate of the received signal.
[0116] Specific manifestations of jamming interference can include strong interference signals causing receiver overload and saturation, thus degrading the receiver's signal reception capability. For example, when the interference signal detected by the controller 13 is classified as jamming interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202, thereby changing the power of the local oscillator signal generated by the local oscillator 202. This causes nonlinear components, such as the mixer 201, to move from the nonlinear region to the linear region, reducing the impact of strong interference signals on the receiver 20 and enabling the receiver 20 to operate normally in a strong interference environment. As another example, when the interference signal detected by the controller 13 is classified as jamming interference, the receiver controller 14 or the receiver controller 30 can control the gain of the demodulation circuit 205. In this case, the gain can be adjusted according to the characteristics of the signal and the interference. For example, when the interference is strong, the gain can be appropriately reduced to avoid excessive amplification of the interference signal; conversely, when the useful signal is strong, the gain can be reasonably increased to obtain a better demodulation effect. For example, when the interference signal obtained by the detection controller 13 is of the type of jamming interference, the receiver controller 14 or the receiver controller 30 can adjust the local oscillator current of the local oscillator 202 and control the gain of the demodulation circuit 205.
[0117] It should be noted that, Figure 10 The receiver 20 may further include a first bandpass filter, a low-noise amplifier, and a second bandpass filter (not shown in the figure) connected in sequence. The input terminal of the receiver 20 may be located after the low-noise amplifier or before the second bandpass filter. The first bandpass filter, the low-noise amplifier, and the second bandpass filter are understood by those skilled in the art and will not be described in detail here.
[0118] In the technical solution of this application, a first-stage signal detection device performs primary detection on the input signal received by the receiver to obtain the signal within a preset frequency range; a second-stage signal detection device performs secondary detection on the input signal to obtain the input signal information; the detection controller determines the interference signal and its interference type based on the input signal information and the signal within the preset frequency range, thereby achieving accurate detection, especially in complex scenarios where multiple interferences coexist. Furthermore, by acquiring the receiver's output signal information through the detection controller, precise control of the receiver can be achieved.
[0119] In some embodiments, the functions or modules of the apparatus provided in this application can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.
[0120] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.
[0121] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.
[0122] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0123] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A signal detection system, characterized in that, Applied to receivers, including: The first-stage signal detection device is connected to the input terminal of the receiver and is used to perform first-stage detection on the input signal of the receiver to obtain the signal within a preset frequency range; The second-stage signal detection device is connected to the input terminal of the receiver and is used to perform secondary detection on the input signal of the receiver to obtain information about the input signal; The detection controller is connected to the first-level signal detection device and the second-level signal detection device respectively, and is used to obtain signals within the preset frequency range from the first-level signal detection device, obtain information of the input signal from the second-level signal detection device, and determine the interference signal and the interference category of the interference signal based on the information of the input signal and the signal within the preset frequency range. The detection controller is also connected to the output terminal of the receiver, and is used to obtain information about the output signal of the receiver from the output terminal of the receiver.
2. The signal detection system as described in claim 1, characterized in that, The detection controller is further configured to send a start command to the second-level signal detection device in response to a voltage corresponding to a signal within the preset frequency range being greater than or equal to a preset voltage value, so that the second-level signal detection device starts in response to the start command and performs secondary detection on the input signal of the receiver.
3. The signal detection system as described in claim 1, characterized in that, The first-level signal detection device includes at least one signal detection circuit, wherein each of the at least one signal detection circuit includes a filter and a detector tube, the input terminal of the filter is connected to the input terminal of the receiver, and the output terminal is connected to the detector tube.
4. The signal detection system as described in claim 1, characterized in that, The second-level signal detection device includes an auxiliary receiver, the input of which is connected to the input of the receiver, and the output of which is connected to the detection controller. The information of the input signal includes the amplitude and frequency of the input signal.
5. A communication device, characterized in that, It includes a receiver and a signal detection system as described in any one of claims 1-4.
6. The communication device as described in claim 5, characterized in that, The communication device also includes: A receiver controller, connected to the detection controller and the receiver, is used to obtain information about the interference category of the interference signal and the output signal of the receiver from the detection controller, and to control the receiver according to the interference category of the interference signal when the information of the output signal of the receiver meets a preset condition.
7. The communication device as described in claim 6, characterized in that, The receiver includes a mixer and a local oscillator, wherein the first input terminal of the mixer serves as the input terminal of the receiver, and the second input terminal of the mixer is connected to the local oscillator; the receiver controller is used to switch the local oscillator frequency in response to the interference type of the interference signal being spurious interference.
8. The communication device as described in claim 7, characterized in that, The receiver further includes an intermediate frequency (IF) filter and a limiting circuit, wherein the limiting circuit includes a first limiting sub-circuit and a second limiting sub-circuit. The input terminal of the IF filter is connected to the output terminal of the mixer. The first limiting sub-circuit and the second limiting sub-circuit are connected to the output terminal of the IF filter via a first switch. The receiver controller is used to control the local oscillator current of the local oscillator and / or switch the first limiting sub-circuit and the second limiting sub-circuit in response to the interference type of the interference signal being intermodulation interference.
9. The communication device as described in claim 7 or 8, characterized in that, The receiver further includes a demodulation circuit, the input of which is connected to the first limiting sub-circuit and the second limiting sub-circuit via a second switch, and the output of which serves as the output of the receiver. The receiver controller is used to control the local oscillator current of the local oscillator and / or control the gain of the demodulation circuit in response to the interference type of the interference signal being blocking interference.
10. The communication device as described in claim 6, characterized in that, The receiver controller is further configured to switch from a first mode to a second mode in response to the information of the output signal of the receiver satisfying the preset condition, wherein, in the second mode, the receiver controller controls the receiver according to the interference category of the interference signal.