Multi-channel wake-up receiver

Abstract

The present invention provides a multi-channel wake-up receiving device, which can be applied to the field of radio frequency wireless communication technology. The device includes: a first channel, which is used to process a target wake-up signal and an interference signal to obtain an intermediate frequency signal and a direct current signal, and the first channel includes: a comparator, which is used to determine the ratio of the strength of the interference signal to the strength of the target wake-up signal according to the intermediate frequency signal and the direct current signal; a controller, which is used to open the second channel when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, and control the first channel to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than a predetermined threshold; a second channel, which is used to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold; and a correlator, which is used to generate a wake-up instruction according to the sequence information.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency wireless communication, and more specifically, to a multi-channel wake-up receiving device. Background Art

[0002] The wake-up receiving device can monitor the channel with a relatively low power consumption of less than 1 microwatt. When the wake-up receiving device receives the wake-up signal, it transmits a wake-up instruction to wake up the main receiver, thereby reducing the standby power consumption of the wireless communication system.

[0003] In the process of realizing the concept of the present invention, it is found through research that the wake-up receiving device in the related art is difficult to achieve the technical effects of low power consumption, anti-interference and low delay at the same time. Summary of the invention

[0004] In view of this, the present invention provides a multi-channel wake-up receiving device.

[0005] One aspect of the present invention provides a multi-channel wake-up receiving device, comprising: a first channel, used to mix the received target wake-up signal and interference signal to obtain an intermediate frequency signal and a direct current signal, the first channel comprising: a frequency band separation amplifier, used to separate the intermediate frequency signal and the direct current signal; a comparator, used to determine the ratio of the strength of the interference signal to the strength of the target wake-up signal based on the intermediate frequency signal and the direct current signal; a controller, used to turn on the second channel when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, and to control the first channel to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than a predetermined threshold; a second channel, used to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold; a correlator, used to generate a wake-up instruction based on the sequence information; wherein the target wake-up signal includes multiple target wake-up sub-signals at different frequencies.

[0006] According to an embodiment of the present invention, the first channel also includes: a first baseband circuit, connected to the frequency band separation amplifier, for receiving an intermediate frequency signal and processing the intermediate frequency signal to obtain a first output signal; a second baseband circuit, connected to the frequency band separation amplifier, for receiving a DC signal and processing the DC signal to obtain a second output signal.

[0007] According to an embodiment of the present invention, the ratio of the strength of the interference signal to the strength of the target wake-up signal is determined based on the intermediate frequency signal and the direct current signal, including: obtaining the power of the first output signal and the power of the second output signal; obtaining the ratio of the power of the intermediate frequency signal to the power of the direct current signal based on the ratio of the power of the first output signal to the power of the second output signal; and determining the ratio of the strength of the interference signal to the strength of the target wake-up signal based on the ratio of the power of the intermediate frequency signal to the power of the direct current signal. According to an embodiment of the present invention, the gain of the first baseband circuit and the gain of the second baseband circuit meet a predetermined ratio.

[0008] According to an embodiment of the present invention, the second channel includes: an amplifier, used to perform noise reduction processing on the received target wake-up signal to obtain a low-noise wake-up signal; a radio frequency mixer, connected to the amplifier, used to mix the low-noise wake-up signal with the local oscillator signal to obtain a mixed signal; a third baseband circuit, connected to the radio frequency mixer, used to process the mixed signal to obtain a third output signal.

[0009] According to an embodiment of the present invention, the oscillation frequency of the local oscillator signal is equal to the center frequency of the target wake-up signal.

[0010] According to an embodiment of the present invention, the element for generating the local oscillation signal includes one of the following: a phase-locked loop and an oscillator.

[0011] According to an embodiment of the present invention, the type of the oscillator includes one of the following: a sine wave oscillator, a ring oscillator, a programmable silicon oscillator, and a crystal oscillator.

[0012] According to an embodiment of the present invention, the stabilization time of the generating element of the local oscillation signal is shorter than the period of the target wake-up signal.

[0013] According to an embodiment of the present invention, when the ratio of the intensity of the interference signal to the intensity of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on, including: when the ratio of the intensity of the interference signal to the intensity of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on according to the period of the target wake-up signal.

[0014] According to an embodiment of the present invention, by mixing the monitored target wake-up signal and the interference signal in the first channel, the ratio of the strength of the interference signal to the strength of the target wake-up signal is determined according to the obtained intermediate frequency signal and direct current signal, thereby indirectly determining the strength of the interference signal. When the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than a predetermined threshold, the first channel completes the wake-up operation and the second channel is not turned on. When the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on and the wake-up operation is completed. Since the channel is adaptively switched according to the strength of the interference signal, when the interference signal is small, the first channel can be used to achieve accurate frequency selection, reducing unnecessary power consumption. When the interference signal is strong, the second channel is turned on to ensure the anti-interference ability of the wake-up receiving device. At the same time, there is no need to reduce the average power consumption through a periodic switching circuit, so the wake-up delay time of the system can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0016] Figure 1 A block diagram of a multi-channel wake-up receiving device provided according to an embodiment of the present invention is shown.

[0017] Figure 2 The power spectra of the target wake-up signal and the interference signal according to the embodiment of the present invention are shown.

[0018] Figure 3 The power spectrum diagram of the mixing result of the first channel self-mixer according to the embodiment of the present invention is shown.

[0019] Figure 4 A schematic diagram showing comparison of the power of a first output signal and a second output signal according to an embodiment of the present invention is shown.

[0020] Figure 5 A schematic diagram showing the working principle of the second channel according to an embodiment of the present invention is shown.

[0021] Figure 6 A schematic diagram of a multi-channel wake-up receiving device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0023] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0024] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0025] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0026] In the embodiments of the present invention, the collection, updating, analysis, processing, use, transmission, provision, invention, storage and other aspects of the data involved (for example, including but not limited to user personal information) are in compliance with the provisions of relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures are taken for user personal information to prevent illegal access to user personal information data and maintain the security of user personal information and network security.

[0027] In the embodiment of the present invention, before obtaining or collecting the user's personal information, the user's authorization or consent is obtained.

[0028] According to different down-conversion methods, conventional wake-up receiving devices are mainly divided into two types: a superheterodyne wake-up receiving device and a self-mixing wake-up receiving device.

[0029] Based on this, the superheterodyne wake-up receiving device performs down-conversion by mixing the received wake-up signal with the local oscillator signal. Since the signal can be accurately selected at the baseband, the superheterodyne wake-up receiving device has good anti-interference ability. However, the superheterodyne wake-up receiving device requires a radio frequency phase-locked loop or oscillator to provide the local oscillator signal, resulting in the entire radio frequency communication system consuming high power consumption, even greater than 100 microwatts.

[0030] Therefore, in order to reduce the standby power consumption of the system, a duty cycle mechanism may be introduced, that is, the average power consumption may be reduced by controlling the wake-up receiving device through a timing switch circuit, but this may result in a wake-up delay of more than 1 second.

[0031] The self-mixing wake-up receiver down-converts the wake-up signal through a self-mixer, thereby eliminating the need for a high-power module such as a radio frequency phase-locked loop or oscillator, thereby achieving nanowatt-level standby power consumption. However, the down-conversion mechanism of the self-mixing wake-up receiver makes it difficult for the subsequent baseband circuit to achieve accurate frequency selection, which makes the self-mixing wake-up receiver have poor anti-interference ability and cannot adapt to the increasingly crowded communication frequency bands at this stage.

[0032] In view of this, an embodiment of the present invention provides a multi-channel wake-up receiving device, including: a first channel, used to mix the received target wake-up signal and the interference signal to obtain an intermediate frequency signal and a direct current signal, the first channel including: a frequency band separation amplifier, used to separate the intermediate frequency signal and the direct current signal; a comparator, used to determine the ratio of the strength of the interference signal to the strength of the target wake-up signal according to the intermediate frequency signal and the direct current signal; a controller, used to turn on the second channel when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, and control the first channel to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than the predetermined threshold; a second channel, used to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold; a correlator, used to generate a wake-up instruction based on the sequence information.

[0033] Figure 1 A block diagram of a multi-channel wake-up receiving device provided according to an embodiment of the present invention is shown.

[0034] like Figure 1 As shown, the embodiment 100 includes a first channel 110, a second channel 120, a comparator 130, a controller 140 and a correlator 150. The first channel includes a frequency band separation amplifier 111.

[0035] According to an embodiment of the present invention, in order to implement a mixing operation, the target wake-up signal adopts a dual-tone encoding method, that is, a signal is transmitted simultaneously at two frequencies, or other encoding methods with the same effect.

[0036] According to an embodiment of the present invention, the first channel 110 may represent a self-mixing channel corresponding to a self-mixing type wake-up receiving device, which has low power consumption and can be kept normally open. The second channel 120 may represent a superheterodyne channel corresponding to a superheterodyne type wake-up receiving device, which has high power consumption but strong anti-interference capability.

[0037] According to an embodiment of the present invention, the target wake-up signal includes target wake-up sub-signals at different frequencies, such as a first target wake-up sub-signal S1 and a second target wake-up sub-signal S2, wherein the power of S1 and S2 is the same.

[0038] Figure 2 The power spectra of the target wake-up signal and the interference signal according to the embodiment of the present invention are shown.

[0039] like Figure 2 As shown, the RF passband includes a first target wake-up sub-signal S1, a second target wake-up sub-signal S2 and an interference signal of different frequencies, the power of S1 and S2 are equal, △f1 is the frequency interval between the interference signal and S1, △f2 is the frequency interval between the interference signal and S2, and fIF1 is the intermediate frequency.

[0040] According to an embodiment of the present invention, the received target wake-up signal and the interference signal are mixed to obtain an intermediate frequency signal and a DC signal, including: the target wake-up signal transmitted by the receiving antenna is processed by a first filter matching network and then enters a self-mixer, and the intermediate frequency signal and the DC signal are obtained through the self-mixer.

[0041] According to an embodiment of the present invention, the self-mixer in the first channel may adopt an active self-mixer structure or a passive self-mixer structure.

[0042] According to an embodiment of the present invention, the first filter matching network can adopt an inductor-based filter matching network, a transformer-based filter matching network, a programmable silicon oscillator-based filter matching network, a crystal resonator-based filter matching network, or a filter matching network composed or cascaded based on one or more components.

[0043] According to an embodiment of the present invention, the frequency separation amplifier in the first channel can amplify the intermediate frequency signal and the DC signal and then separate them using a filter, or separate the intermediate frequency signal and the DC signal by a filter and then amplify them separately, or filter and amplify them in the same circuit. According to actual needs, the frequency separation amplifier can amplify the DC signal or not.

[0044] In order to better understand the working principle of the wake-up receiving device in the embodiment of the present invention, two target wake-up sub-signals are used as examples for explanation below.

[0045] The target awakening sub-signals at two different frequencies are mixed with each other and downconverted to an intermediate frequency to obtain an intermediate frequency signal. At the same time, the two target awakening sub-signals each generate a self-mixing signal and downconvert it to a DC signal to obtain a DC signal.

[0046] According to an embodiment of the present invention, when there are only two frequencies with target wake-up sub-signals in the RF passband and the target wake-up sub-signals transmitted at the two frequencies have the same power, the intermediate frequency signal power output by the self-mixer is equal to the DC signal power. Conversely, in the presence of an interference signal, the interference signal itself will also undergo self-mixing, thus causing the DC signal power to be higher than the intermediate frequency signal power.

[0047] Figure 3 The power spectrum diagram of the mixing result of the first channel self-mixer according to the embodiment of the present invention is shown.

[0048] like Figure 3 As shown, the intermediate frequency signal 310 is the mixing result of the first target wake-up sub-signal S1 and the second target wake-up sub-signal S2, the first interference mixing signal 320 is the mixing result of the interference signal and S1, the second interference mixing signal 330 is the mixing result of the interference signal and S2, and the DC signal 340 is the result of signal self-mixing.

[0049] According to an embodiment of the present invention, the strength of the interference signal can be determined based on the intermediate frequency signal power and the DC signal power, and a predetermined threshold can be set according to actual needs, and the ratio of the strength of the interference signal to the strength of the target wake-up signal greater than the predetermined threshold is used as the opening standard of the second channel.

[0050] According to an embodiment of the present invention, the comparator may include a dynamic comparator and a static comparator.

[0051] According to an embodiment of the present invention, the controller may be a switch, that is, when the ratio of the strength of the interference signal to the strength of the target wake-up signal is less than a predetermined threshold, the switch is kept open, and the wake-up receiving device completes monitoring of the target wake-up signal through the first channel. At the same time, when the ratio of the strength of the interference signal to the strength of the target wake-up signal is greater than a predetermined threshold, the switch is closed, the second channel enters the working state, receives the target wake-up signal, and completes monitoring of the target wake-up signal.

[0052] According to an embodiment of the present invention, the correlator is used to receive the sequence information corresponding to the target wake-up signal output by the channel, perform correlation operation with its own sequence information, determine whether the sequence information is synchronized, and generate a corresponding wake-up instruction.

[0053] According to an embodiment of the present invention, by mixing the monitored target wake-up signal and the interference signal in the first channel, the ratio of the strength of the interference signal to the strength of the target wake-up signal is determined according to the obtained intermediate frequency signal and direct current signal, thereby indirectly determining the strength of the interference signal. When the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than a predetermined threshold, the first channel completes the wake-up operation and the second channel is not turned on. When the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on and the wake-up operation is completed. Since the channel is adaptively switched according to the strength of the interference signal, when the interference signal is small, the first channel can be used to achieve accurate frequency selection, reducing unnecessary power consumption. When the interference signal is strong, the second channel is turned on to ensure the anti-interference ability of the wake-up receiving device. At the same time, there is no need to reduce the average power consumption through a periodic switching circuit, so the wake-up delay time of the system can be greatly reduced.

[0054] According to an embodiment of the present invention, the first channel also includes: a first baseband circuit, connected to the frequency band separation amplifier, for receiving an intermediate frequency signal and processing the intermediate frequency signal to obtain a first output signal; a second baseband circuit, connected to the frequency band separation amplifier, for receiving a DC signal and processing the DC signal to obtain a second output signal.

[0055] According to an embodiment of the present invention, the first baseband circuit amplifies and filters the intermediate frequency signal output by the frequency separation amplifier and downconverts it to DC to obtain a first output signal, and also includes filtering out the baseband thermal noise signal; the second baseband circuit amplifies and filters the DC signal output by the frequency separation amplifier to obtain a second output signal.

[0056] According to an embodiment of the present invention, the first baseband circuit may down-convert the intermediate frequency signal by self-mixing or by mixing with a local oscillator signal.

[0057] According to the embodiment of the present invention, the first baseband circuit and the second baseband circuit appropriately amplify and filter the intermediate frequency signal and the direct current signal to eliminate noise and obtain relatively stable first output signal and second output signal.

[0058] According to an embodiment of the present invention, the ratio of the strength of the interference signal to the strength of the target wake-up signal is determined based on the intermediate frequency signal and the direct current signal, including: obtaining the power of the first output signal and the power of the second output signal; obtaining the ratio of the power of the intermediate frequency signal to the power of the direct current signal based on the ratio of the power of the first output signal to the power of the second output signal; and determining the ratio of the strength of the interference signal to the strength of the target wake-up signal based on the ratio of the power of the intermediate frequency signal to the power of the direct current signal.

[0059] According to an embodiment of the present invention, the ratio of the power of the first output signal to the power of the second output signal and the ratio of the power of the intermediate frequency signal to the power of the DC signal are in direct proportion. The greater the strength of the interference signal, the greater the ratio. Therefore, a predetermined threshold is set to determine the correspondence between the strength of the interference signal and the working channel, wherein the predetermined threshold can be determined by adjusting the gains of the first baseband circuit and the second baseband circuit, or by performing a specific design on the comparator.

[0060] According to an embodiment of the present invention, a gain of the first baseband circuit and a gain of the second baseband circuit satisfy a predetermined ratio.

[0061] According to an embodiment of the present invention, the gain of the first baseband circuit for the signal should be higher than the gain of the second baseband circuit. The predetermined ratio can be determined based on the requirements of anti-interference and low power consumption.

[0062] According to an embodiment of the present invention, the strength of the interference signal and the strength of the target wake-up signal are mapped according to the ratio of the power of the first output signal to the power of the second output signal, so that the channel operation is switched according to the strength of the interference signal. At the same time, the gain of the baseband circuit is set according to demand, thereby realizing a wake-up receiving device with high anti-interference and low power consumption.

[0063] Figure 4 A schematic diagram showing comparison of the power of a first output signal and a second output signal according to an embodiment of the present invention is shown.

[0064] like Figure 4 As shown, the frequency separation amplifier separates the intermediate frequency signal 310 and the direct current signal 340 and inputs them into the first baseband circuit and the second baseband circuit respectively, to obtain the first output signal 410 and the second output signal 420. The output ends of the first baseband circuit and the second baseband circuit are connected to the comparator 130, and the power of the first output signal 410 is compared with the power of the second output signal 420.

[0065] According to an embodiment of the present invention, the second channel includes: an amplifier, used to perform noise reduction processing on the received target wake-up signal to obtain a low-noise wake-up signal; a radio frequency mixer, connected to the amplifier, used to mix the low-noise wake-up signal with the local oscillator signal to obtain a mixed signal; a third baseband circuit, connected to the radio frequency mixer, used to process the mixed signal to obtain a third output signal.

[0066] According to an embodiment of the present invention, the second channel also includes a second filter matching network. The second filter matching network can adopt a filter matching network based on an inductor, a filter matching network based on a transformer, a filter matching network based on a programmable silicon oscillator, a filter matching network based on a crystal resonator, or a filter matching network composed of one or more components or cascades. The second filter matching network can be resistant to transformation and can keep the impedance unchanged.

[0067] According to the embodiment of the present invention, the radio frequency mixer may adopt an active mixer structure or a passive mixer structure.

[0068] According to an embodiment of the present invention, the third baseband circuit may use a single frequency reduction to reduce the frequency of the mixed signal to a DC current, or may use multiple frequency reductions to reduce the frequency of the mixed signal to a DC current.

[0069] Figure 5 A schematic diagram showing the working principle of the second channel according to an embodiment of the present invention is shown.

[0070] like Figure 5 As shown, within the RF passband, the first target wake-up sub-signal S1, the second target wake-up sub-signal S2, the interference signal and the local oscillator signal are received. The local oscillator signal is at the intermediate frequency between the first target wake-up sub-signal and the second target wake-up sub-signal, and the frequency interval between the local oscillator signal and S1 and S2 is fIF2.

[0071] According to an embodiment of the present invention, the first target wake-up sub-signal S1, the second target wake-up sub-signal S2, the interference signal and the local oscillator signal are mixed by the RF mixer to obtain the intermediate frequency signal 310 and the DC signal 340. The second channel has a strong anti-interference ability, so it can accurately select the frequency when the interference ability is strong.

[0072] According to an embodiment of the present invention, when the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than a predetermined threshold, the second channel is turned off, which can effectively save system power consumption. When the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, the first channel cannot distinguish between the interference signal and the target wake-up signal, so activating the superheterodyne channel can provide sufficient anti-interference capability for the wake-up receiving device.

[0073] Figure 6 A schematic diagram of a multi-channel wake-up receiving device according to an embodiment of the present invention is shown.

[0074] like Figure 6As shown, the process of determining the strength of the interference signal is completed through the first channel, thereby avoiding additional power consumption, and the second channel is disconnected at this time. The output ends of the first baseband circuit and the third baseband circuit are connected to an analog-to-digital converter for converting analog signals into digital signals for further digital signal processing, such as demodulation and decoding. The process of switching channels of the multi-channel wake-up receiving device to complete the monitoring of the target wake-up signal has been described in detail above and will not be repeated here.

[0075] According to an embodiment of the present invention, the oscillation frequency of the local oscillator signal is equal to the center frequency of the target wake-up signal.

[0076] According to the embodiment of the present invention, the oscillation frequency of the local oscillator signal is equal to the center frequency of the target wake-up signal, which is the key to ensure that the wake-up receiving device receives the signal efficiently and accurately. Therefore, it is necessary to achieve high-performance signal mixing and demodulation through precise frequency control to improve the overall performance and reliability of the wake-up receiving device system.

[0077] According to an embodiment of the present disclosure, the antenna is used to send the received target wake-up signal to the first channel, perform self-mixing in the first channel, and obtain the first output signal and the second output signal.

[0078] According to an embodiment of the present invention, the element for generating the local oscillation signal includes one of the following: a phase-locked loop and an oscillator.

[0079] According to an embodiment of the present invention, a phase-locked loop is a feedback control system that can lock the frequency and phase of an oscillating signal, and is generally used to generate a local oscillator signal with high stability and accuracy. The phase-locked loop can adjust the oscillator frequency by comparing the phase of the local oscillator signal with the target wake-up signal to ensure that the two are synchronized.

[0080] According to an embodiment of the present invention, the type of the oscillator includes one of the following: a sine wave oscillator, a ring oscillator, a programmable silicon oscillator, and a crystal oscillator.

[0081] According to an embodiment of the present invention, an oscillator is a basic element for generating a periodic signal, and can directly generate a required local oscillator signal. Different types of oscillators have their specific application scenarios and performance characteristics, and can be selected according to actual needs. The oscillator should have low power consumption and low phase noise to ensure that the wake-up receiving device can achieve low average power consumption and high sensitivity at the same time.

[0082] According to an embodiment of the present invention, the stabilization time of the generating element of the local oscillation signal is shorter than the period of the target wake-up signal.

[0083] According to an embodiment of the present invention, the oscillator or phase-locked loop should be started quickly and stabilized, and the stabilization time should be less than one signal cycle of the target wake-up signal.

[0084] According to an embodiment of the present invention, when the ratio of the intensity of the interference signal to the intensity of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on, including: when the ratio of the intensity of the interference signal to the intensity of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on according to the period of the target wake-up signal.

[0085] According to an embodiment of the present invention, the second channel is started within a target wake-up signal cycle. Therefore, when a strong interference signal appears in the RF passband, the wake-up receiving device can complete the switching within one signal cycle, so that when the interference signal appears, there will be no bit errors due to failure to switch channels in time, and the wake-up will not be missed due to the presence of the interference signal.

[0086] According to the embodiment of the present invention, since there is no need to switch channels by periodically switching the circuit, the delay is greatly reduced compared to a duty cycle type superheterodyne wake-up receiver.

[0087] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present invention can be combined and / or combined in various ways, even if such a combination or combination is not explicitly recorded in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features recorded in the various embodiments of the present invention can be combined and / or combined in various ways. All such combinations and / or combinations fall within the scope of the present invention.

[0088] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A multi-channel wake-up receiving device, characterized in that: include: The first channel is used to perform mixing processing on the received target wake-up signal and the interference signal to obtain an intermediate frequency signal and a direct current signal, and the first channel includes: A frequency band separation amplifier, used for separating the intermediate frequency signal and the direct current signal; A comparator, used to determine the ratio of the strength of the interference signal to the strength of the target wake-up signal according to the intermediate frequency signal and the direct current signal; A controller, configured to, when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, turn on the second channel, and when the ratio of the strength of the interference signal to the strength of the target wake-up signal is lower than the predetermined threshold, control the first channel to output sequence information corresponding to the target wake-up signal; The second channel is used to output sequence information corresponding to the target wake-up signal when the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than the predetermined threshold; A correlator, used to generate a wake-up instruction according to the sequence information; The target wake-up signal includes a plurality of target wake-up sub-signals at different frequencies.

2. The device according to claim 1, characterized in that The first channel also includes: A first baseband circuit, connected to the frequency band separation amplifier, for receiving the intermediate frequency signal and processing the intermediate frequency signal to obtain a first output signal; The second baseband circuit is connected to the frequency band separation amplifier and is used for receiving the DC signal and processing the DC signal to obtain a second output signal.

3. The device according to claim 2, characterized in that The determining, according to the intermediate frequency signal and the direct current signal, a ratio of the strength of the interference signal to the strength of the target wake-up signal includes: Acquiring the power of the first output signal and the power of the second output signal; Obtaining a ratio of the power of the intermediate frequency signal to the power of the direct current signal according to a ratio of the power of the first output signal to the power of the second output signal; The ratio of the strength of the interference signal to the strength of the target wake-up signal is determined according to the ratio of the power of the intermediate frequency signal to the power of the direct current signal.

4. The device according to claim 2, characterized in that A gain of the first baseband circuit and a gain of the second baseband circuit satisfy a predetermined ratio.

5. The device according to claim 1, characterized in that The second channel comprises: An amplifier, configured to perform noise reduction processing on the received target wake-up signal to obtain a low-noise wake-up signal; A radio frequency mixer, connected to the amplifier, for mixing the low-noise wake-up signal with a local oscillator signal to obtain a mixed signal; The third baseband circuit is connected to the radio frequency mixer and is used for processing the mixing signal to obtain a third output signal.

6. The device according to claim 5, characterized in that The oscillation frequency of the local oscillation signal is equal to the center frequency of the target wake-up signal.

7. The device according to claim 5, characterized in that The generating element of the local oscillation signal includes one of the following: a phase-locked loop and an oscillator.

8. The device according to claim 7, characterized in that The type of the oscillator includes one of the following: a sine wave oscillator, a ring oscillator, a programmable silicon oscillator, and a crystal oscillator.

9. The device according to claim 7, characterized in that The stabilization time of the generating element of the local oscillation signal is shorter than the period of the target wake-up signal.

10. The device according to claim 1, characterized in that When the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, opening the second channel includes: When the ratio of the strength of the interference signal to the strength of the target wake-up signal is higher than a predetermined threshold, the second channel is turned on according to the period of the target wake-up signal.

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