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WO2024217084A1 - Dispositif électronique, système de communication, procédé de traitement de signal et procédé de communication - Google Patents

Dispositif électronique, système de communication, procédé de traitement de signal et procédé de communication Download PDF

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Publication number
WO2024217084A1
WO2024217084A1 PCT/CN2024/071822 CN2024071822W WO2024217084A1 WO 2024217084 A1 WO2024217084 A1 WO 2024217084A1 CN 2024071822 W CN2024071822 W CN 2024071822W WO 2024217084 A1 WO2024217084 A1 WO 2024217084A1
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WO
WIPO (PCT)
Prior art keywords
signal
clock
frequency
electronic device
module
Prior art date
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Pending
Application number
PCT/CN2024/071822
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English (en)
Chinese (zh)
Inventor
汪孙节
张旭
李小明
王朗
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2024217084A1 publication Critical patent/WO2024217084A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/2866—Architectures; Arrangements
    • H04L67/2869—Terminals specially adapted for communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of Internet of Things, and in particular to an electronic device, a communication system, a signal processing method and a communication method.
  • IoT Internet of Things
  • IoT terminals have built-in batteries to support the sending and receiving of signals, thereby achieving communication.
  • battery power increases the portability, mobility and application scope of IoT terminals, and to a certain extent alleviates the strict requirements of IoT terminals on power consumption, but there are still problems such as size, cost, troublesome battery replacement, and battery pollution.
  • the power consumption of the existing IoT terminals with built-in batteries is still relatively large.
  • the existing technology is to make the power consumption of IoT terminals small enough to achieve the effect of not needing to carry its own battery, the hardware conditions of the communication objects of the IoT terminals in the Internet of Things will be very high, resulting in an increase in the overall power consumption and cost of the Internet of Things.
  • the electronic device of the embodiment of the present application can have lower power consumption as an IoT terminal.
  • the overall power consumption and cost of the Internet of Things including the electronic device are also low, which is convenient for realizing a wide range of passive Internet of Things at low cost.
  • an embodiment of the present application provides an electronic device, comprising a frequency shift modulation module, a data storage module and a clock acquisition module, wherein the data storage module is used to store data to be sent; the clock acquisition module is used to demodulate a received clock coordination signal to obtain a first clock signal, and output the first clock signal to the frequency shift modulation module, wherein the first clock signal serves as the working clock of the electronic device; the frequency shift modulation module is used to obtain the data to be sent from the data storage module when an excitation signal is received, modulate the excitation signal according to the data to be sent and the first clock signal, obtain a wireless communication signal and send it out, and the frequency of the wireless communication signal is different from the frequency of the excitation signal.
  • the clock acquisition module demodulates the received clock coordination signal to obtain the first clock signal, and the first clock signal is used as the working clock of the electronic device, so that the electronic device does not need to generate a clock by itself.
  • the clock acquisition module outputs the first clock signal to the frequency shift modulation module.
  • the frequency shift modulation module When the frequency shift modulation module receives the excitation signal, it obtains the data to be sent from the data storage module, modulates the excitation signal according to the data to be sent and the first clock signal, obtains the wireless communication signal and sends it, wherein the power consumption of the wireless communication signal modulated by the excitation signal is much less than the power consumption of the electronic device actively generating the wireless communication signal, thereby further reducing the power consumption of the electronic device, so that the electronic device as an IoT terminal can have lower power consumption.
  • the frequency of the wireless communication signal is different from the frequency of the excitation signal, so the wireless communication signal and the excitation signal do not interfere with each other, and for other devices in the Internet of Things IoT that need to receive wireless communication signals, no additional interference removal operation is required, that is, the hardware conditions of other devices in the Internet of Things IoT that need to receive wireless communication signals are lower, so the overall power consumption and cost of the IoT including the electronic device are also lower, which is convenient for low-cost realization of a wide range of passive Internet of Things.
  • the clock coordination signal is a modulated signal
  • the frequency of the first clock signal is equal to the modulation frequency of the clock coordination signal
  • the clock acquisition module can demodulate and obtain a first clock signal with a certain frequency, thereby providing a stable working clock for the electronic device, making it possible for the electronic device to not be provided with a crystal oscillator.
  • the wireless communication signal includes a first frequency and a second frequency
  • the center frequency of the wireless communication signal is between the first frequency and the second frequency
  • the frequency shift modulation module is specifically used to: determine the center frequency according to the excitation signal and a preset value range of the first frequency difference, the first frequency difference is the difference between the center frequency of the wireless communication signal and the first frequency, and the difference between the frequency of the excitation signal and the center frequency is greater than the first frequency difference; obtain a second clock signal and a third clock signal according to the excitation signal, the first clock signal and the center frequency, the sum of the frequency of the second clock signal and the frequency of the excitation signal is equal to the first frequency, and the sum of the frequency of the third clock signal and the frequency of the excitation signal is equal to the second frequency; modulate the excitation signal according to the second clock signal, the third clock signal and the data to be sent to obtain and send the wireless communication signal, and different frequencies
  • a wireless communication signal can be modulated.
  • the frequency of the wireless communication signal modulated in this way is different from the frequency of the excitation signal, which can avoid the excitation signal from interfering with the wireless communication signal.
  • the data to be sent includes at least one bit of data
  • the excitation signal is modulated according to the second clock signal, the third clock signal and the data to be sent to obtain and send the wireless communication signal, including: in the data to be sent, when the value of the previous bit of data is 0, the excitation signal is modulated based on the second clock signal to obtain and send a wireless communication signal having a frequency equal to the first frequency; in the data to be sent, when the value of the previous bit of data is 1, the excitation signal is modulated based on the third clock signal to obtain and send a wireless communication signal having a frequency equal to the second frequency.
  • the modulation of the wireless communication signal can be completed according to the numerical characteristics of the data to be sent.
  • the clock coordination signal is further used to generate electric energy for powering the electronic device.
  • the sub-device can be a passive physical device, so that the electronic device can be applied to more application scenarios where charging is inconvenient.
  • the electronic device also includes a wireless charging module, and the wireless charging module is used to convert the received clock coordination signal into electrical energy to power the electronic device.
  • the electronic device includes an electronic tag.
  • an embodiment of the present application provides a communication system, including a signal generating subsystem, a receiving module, and an electronic device of one or more of the above first aspect or multiple possible implementation methods of the first aspect, wherein the signal generating subsystem is used to modulate the original clock signal to obtain a clock coordination signal, emit the clock coordination signal, and emit an excitation signal; the electronic device receives the clock coordination signal and the excitation signal, generates a wireless communication signal according to the clock coordination signal, the excitation signal and the data to be sent, and emits it; the receiving module is used to receive the wireless communication signal and demodulate it to obtain the data to be sent.
  • the original clock signal is modulated by the signal generating subsystem to obtain a clock coordination signal, and the clock coordination signal is sent out, and used to send out an excitation signal, so that the electronic device only undertakes the signal modulation work, and does not need to generate a clock and a modulated carrier, so that the electronic device can be crystal-free, reducing the power consumption of the electronic device;
  • the clock coordination signal and the excitation signal are received by the electronic device, and a wireless communication signal is generated and sent according to the clock coordination signal, the excitation signal and the data to be sent, and the receiving module receives the wireless communication signal and demodulates to obtain the data to be sent, so that the transmission of the data to be sent can be completed, and there is no co-frequency interference between the wireless communication signal and the excitation signal, which can reduce the hardware cost of the receiving module.
  • the communication system of the embodiment of the present application can support passive electronic devices as communication nodes. While reducing the power consumption of electronic devices, the overall power consumption of the communication system is also reduced, which is convenient for low-cost realization of a wide range of passive Internet of Things.
  • one or both of the signal generating subsystem and the receiving module are arranged on the same device, and neither the signal generating subsystem nor the receiving module is arranged on the electronic device.
  • the signal generation subsystem is more flexible to set up.
  • the hardware cost of the signal generation subsystem is lower.
  • the clock coordination signal includes at least two frequencies, and the frequency of the excitation signal is the same as any one of the frequencies included in the clock coordination signal.
  • excitation signal and the clock coordination signal are signals of the same frequency band
  • common wireless communication devices such as Wi-Fi routers or Bluetooth devices can support the functions of the signal generation subsystem, making the implementation cost of the Internet of Things lower.
  • the signal generating subsystem includes a clock module and an excitation module
  • the clock module is used to modulate the original clock signal to obtain the clock coordination signal, and emit the clock coordination signal
  • the excitation module is used to emit the excitation signal
  • one or more of the excitation module, the clock module, and the receiving module are arranged on the same device, and the excitation module, the clock module, and the receiving module are not arranged on the electronic device.
  • the frequency of the clock coordination signal can be adjusted, so that the communication distance of the clock coordination signal can be maintained at a larger value.
  • the excitation module By setting the clock module and the receiving module in the same device, and setting the excitation module in a different device, the excitation The device where the module is located is simplified and the hardware implementation cost is lower.
  • an embodiment of the present application provides a signal processing method, which is applied to an electronic device, wherein the electronic device includes a frequency shift modulation module, a data storage module and a clock acquisition module, wherein the data storage module is used to store data to be sent, and the method includes: the clock acquisition module demodulates a received clock coordination signal to obtain a first clock signal, outputs the first clock signal to the frequency shift modulation module, and the first clock signal serves as the working clock of the electronic device; when the frequency shift modulation module receives an excitation signal, the frequency shift modulation module obtains the data to be sent from the data storage module, modulates the excitation signal according to the data to be sent and the first clock signal, and outputs a wireless communication signal.
  • the clock coordination signal is a modulated signal
  • the frequency of the first clock signal is equal to the modulation frequency of the clock coordination signal
  • the wireless communication signal includes a first frequency and a second frequency
  • the center frequency of the wireless communication signal is between the first frequency and the second frequency
  • the frequency shift modulation module receives the excitation signal, obtains the data to be sent from the data storage module, modulates the excitation signal according to the data to be sent and the first clock signal, and outputs a wireless communication signal, including: determining the center frequency according to the excitation signal and a preset value range of a first frequency difference, the first frequency difference is the difference between the center frequency of the wireless communication signal and the first frequency, and the difference between the frequency of the excitation signal and the center frequency is greater than the first frequency difference; obtaining a second clock signal and a third clock signal according to the excitation signal, the first clock signal and the center frequency, the sum of the frequency of the second clock signal and the frequency of the excitation signal is equal to the first frequency, and the sum of the frequency of the third clock signal
  • the data to be sent includes at least one bit of data
  • the excitation signal is modulated according to the second clock signal, the third clock signal and the data to be sent to obtain and send the wireless communication signal, including: in the data to be sent, when the value of the previous bit of data is 0, the excitation signal is modulated based on the second clock signal to obtain and send a wireless communication signal having a frequency equal to the first frequency; in the data to be sent, when the value of the previous bit of data is 1, the excitation signal is modulated based on the third clock signal to obtain and send a wireless communication signal having a frequency equal to the second frequency.
  • the clock coordination signal is also used to generate electric energy for powering the electronic device.
  • the electronic device also includes a wireless charging module, and the method also includes: the wireless charging module converts the received clock coordination signal to obtain electrical energy to power the electronic device.
  • the electronic device includes an electronic tag.
  • an embodiment of the present application provides a communication method, which is applied to a communication system, wherein the communication system includes a signal generating subsystem, a receiving module, and one or more electronic devices of the above first aspect or multiple possible implementations of the first aspect, wherein the method includes: the signal generating subsystem modulates the original clock signal to obtain a clock coordination signal, sends the clock coordination signal, and sends an excitation signal; the electronic device receives the clock coordination signal The clock coordination signal and the excitation signal generate and send a wireless communication signal according to the clock coordination signal, the excitation signal and the data to be sent; the receiving module receives the wireless communication signal and demodulates it to obtain the data to be sent.
  • one or both of the signal generating subsystem and the receiving module are arranged on the same device, and neither the signal generating subsystem nor the receiving module is arranged on the electronic device.
  • the clock coordination signal includes at least two frequencies, and the frequency of the excitation signal is the same as any one of the frequencies included in the clock coordination signal.
  • the signal generating subsystem includes a clock module and an excitation module, and the signal generating subsystem modulates the original clock signal to obtain a clock coordination signal, sends out the clock coordination signal, and sends out an excitation signal, including: the clock module modulates the original clock signal to obtain the clock coordination signal, and sends out the clock coordination signal; the excitation module sends out the excitation signal; wherein, one or more of the excitation module, the clock module, and the receiving module are set on the same device, and the excitation module, the clock module, and the receiving module are not set on the electronic device.
  • FIG. 1 shows an architecture diagram of the Internet of Things according to prior art 1.
  • FIG. 2 shows an architecture diagram of the Internet of Things according to the second prior art.
  • FIG. 3 shows an architecture diagram of the Internet of Things of prior art three.
  • FIG. 4 is a frequency domain schematic diagram of a signal before and after frequency shift in the third prior art.
  • FIG. 5 shows an exemplary structural diagram of an electronic device 10 according to an embodiment of the present application.
  • FIG6 is a schematic diagram showing a frequency domain of a signal received and generated by an electronic device according to an embodiment of the present application.
  • FIG. 7 a shows an exemplary structural diagram of an electronic device 10 according to an embodiment of the present application.
  • FIG. 7 b shows an exemplary structural diagram of a communication system according to an embodiment of the present application.
  • FIG8 shows an exemplary application scenario of a communication system according to an embodiment of the present application.
  • FIG9 is a schematic diagram showing, in the frequency domain, various signals transmitted in a communication system in an exemplary application scenario according to an embodiment of the present application.
  • FIG. 10 shows an exemplary structural diagram of a signal generating subsystem according to an embodiment of the present application.
  • FIG11 is a schematic diagram showing, in the frequency domain, various signals transmitted in a communication system in an exemplary application scenario according to an embodiment of the present application.
  • FIG. 12 shows another exemplary application scenario according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram showing a flow of a signal processing method according to an embodiment of the present application.
  • FIG. 14 is a schematic diagram showing a process of a communication method according to an embodiment of the present application.
  • Prior art 1 proposes a Bluetooth terminal that implements wireless communication based on Bluetooth low energy (BLE) technology as an IoT terminal.
  • FIG1 shows an architecture diagram of the Internet of Things of prior art 1.
  • the Internet of Things of the prior art 1 includes two types of wireless communication nodes, namely Bluetooth base stations and Bluetooth terminals, which exchange information through Bluetooth signals (electromagnetic waves).
  • the battery powers the Bluetooth communication module.
  • the Bluetooth communication module actively generates a Bluetooth signal and transmits it into the air.
  • the power supply/battery powers the Bluetooth communication module.
  • the Bluetooth signal transmitted by the Bluetooth terminal can be received by the Bluetooth communication module of the Bluetooth base station, thereby completing the transmission of information.
  • the communication distance between the Bluetooth base station and the Bluetooth terminal ranges from a few meters to hundreds of meters.
  • the Bluetooth terminal needs to actively generate a Bluetooth signal, and the frequency of the generated Bluetooth signal is 2.4 GHz or 5.8 GHz, the Bluetooth communication module in the Bluetooth terminal needs a GHz-level clock crystal oscillator, so the power consumption is still relatively large, generally several hundred milliwatts, and a battery is required to be powered. Batteries bring problems such as volume, cost, battery replacement, and battery pollution of the environment. Furthermore, the battery life should be considered during use, or charging is required.
  • the Bluetooth terminal can be a Bluetooth headset, and if the frequency of use is high, it needs to be charged every few days.
  • frequent charging is difficult to implement for some Bluetooth terminals, such as logistics or office assets, including packages, clothing, chairs, etc., resulting in restrictions on the types of Bluetooth terminals in the Internet of Things.
  • the second prior art proposes a passive RFID tag that realizes wireless communication based on ultra-high frequency radio frequency identification (RFID) technology.
  • RFID radio frequency identification
  • the Internet of Things of the second prior art includes two types of wireless communication nodes, namely, an RFID reader and a passive RFID tag.
  • a power source/battery supplies power to the RFID communication module
  • the RFID communication module includes two functions: 1) transmitting an excitation signal; and 2) receiving a reflected signal from a passive RFID tag and demodulating the signal to obtain data.
  • Passive RFID tags use backscatter communications (BC) technology, which can reflect the excitation signal and modulate the data to be sent on the reflected signal.
  • the data to be sent is stored in the data source of the passive RFID tag in binary form.
  • the modulation of the reflected signal can be controlled by the reflection switch modulation module on the passive RFID tag.
  • the passive RFID tag Under the control of the reflection switch modulation module, when the data to be sent is 1, the passive RFID tag can generate a reflection signal (RFID signal) and send it out.
  • RFID signal reflection signal
  • the passive RFID tag does not generate a reflection signal. In this way, the passive RFID tag can be extremely simple and does not require complex circuits.
  • the energy required for communication can be significantly reduced.
  • the power consumption of the passive RFID tag is several microwatts.
  • a wireless charging module can be further set on the passive RFID tag to obtain the excitation signal and convert it into energy to wirelessly charge the switch circuit, so that the passive RFID tag can be used without Batteries are required.
  • the second existing technology has been widely used in logistics, warehousing and other fields, and the supported communication distance is generally from tens of centimeters to several meters.
  • the disadvantage of the second prior art is that the RFID reader needs to solve relatively complex signal processing, including eliminating the interference of the excitation electromagnetic wave signal on the RFID reflection signal, and has high cost and power consumption. It is currently a dedicated device and is expensive. When used, it leads to high overall power consumption and cost of the Internet of Things. Therefore, its use is still subject to many restrictions and is mainly used in factory warehousing and logistics, and lacks universality.
  • the prior art 3 proposes a Bluetooth tag that generates Bluetooth signals for information transmission through backscattering technology as an IoT terminal.
  • FIG3 shows the architecture diagram of the Internet of Things of the prior art 3.
  • the prior art three decouples the RFID communication module of the prior art two.
  • the power supply/battery supplies power to the excitation module, and the excitation module is responsible for generating an excitation signal with a frequency point of f1.
  • the data to be sent is stored in the data source in binary form.
  • the clock crystal oscillator provides the clock signal required for frequency shifting (not shown), the frequency shift reflection modulation module reflects the excitation signal, and uses the clock signal to perform frequency shifting on the reflected signal (frequency of f1), so that the center frequency of the frequency-shifted signal is f2 (f2 ⁇ f1), and then the data to be sent is modulated on the frequency-shifted signal, and the Bluetooth signal is obtained after modulation and transmitted into the air.
  • FIG4 shows a frequency domain schematic diagram of the signal before and after frequency shifting in the prior art three. As shown in FIG4 , ⁇ f is the difference between the actual frequency point of the Bluetooth signal and the center frequency f2.
  • the Bluetooth signal with a center frequency of f2 can be received by a general Bluetooth receiving device, such as a mobile phone or a tablet computer, and the power supply/battery in the Bluetooth receiving device supplies power to the Bluetooth communication module, and the Bluetooth communication module demodulates the Bluetooth signal to obtain the corresponding data.
  • a general Bluetooth receiving device such as a mobile phone or a tablet computer
  • Frequency shifting makes the Bluetooth signal and the excitation signal at different frequencies, thereby avoiding interference from the excitation signal when the Bluetooth receiving device receives the Bluetooth signal.
  • the prior art three does not need to actively generate electromagnetic waves, so the power consumption of the Bluetooth tag can be reduced by 1 to 2 orders of magnitude compared with the traditional Bluetooth terminal, which is about 1 milliwatt.
  • the main source of power consumption of Bluetooth tags is frequency shifting. Considering that the Bluetooth channel bandwidth is 2 megahertz (MHz), the number of frequency shifts is N times that of 2MHz, so a clock crystal of N*2MHz is required. The power consumption of this clock crystal is in the milliwatt level. However, it has been reduced a lot compared to the GHz-level clock crystal of the prior art one. However, compared with the power consumption of a few microwatts of passive RFID tags, it is still 2 to 3 orders of magnitude larger, so it generally still needs to be powered by batteries. That is, there are still a series of problems caused by batteries.
  • the power consumption of the IoT terminal with its own battery in the prior art is still relatively large. If the power consumption of the IoT terminal is to be small enough to achieve the effect of not needing a battery, the hardware conditions of the communication object of the IoT terminal in the Internet of Things will be very high, resulting in an increase in the overall power consumption and cost of the IoT. Therefore, how to make the IoT terminal have lower power consumption while also lowering the overall power consumption and cost of the IoT has become a research hotspot in this field.
  • the electronic device of the embodiment of the present application has low power consumption as an IoT terminal.
  • the overall power consumption and cost of the Internet of Things including the electronic device are also low, which facilitates the low-cost realization of a wide range of passive Internet of Things.
  • FIG. 5 shows an exemplary structural diagram of an electronic device 10 according to an embodiment of the present application.
  • the electronic device includes a frequency shift modulation module 110, a data storage module 120 and a clock acquisition module 130.
  • the data storage module 120 is used to store data to be sent
  • the clock acquisition module 130 is used to demodulate the received clock coordination signal to obtain a first clock signal, and output the first clock signal to the frequency shift modulation module 110, and the first clock signal is used as the working clock of the electronic device 10;
  • the frequency shift modulation module 110 is used to obtain the data to be sent from the data storage module 120 when receiving the excitation signal.
  • the excitation signal is modulated according to the data to be sent and the first clock signal to obtain a wireless communication signal and send it out.
  • the frequency of the wireless communication signal is different from the frequency of the excitation signal.
  • the electronic device includes an electronic tag.
  • the electronic tag may be an electronic tag of clothing, an electronic tag of a package, an electronic tag of furniture, etc., and the present application does not limit the use object of the electronic tag. It is understandable that the electronic device may also be of other possible types, and the present application does not limit the specific type of the electronic device.
  • the electronic device 10 (such as an electronic tag) may have wireless communication capabilities, and the clock coordination signal may be a signal carrying clock information received by the electronic device 10 through an air interface.
  • the clock acquisition module 130 of the electronic device 10 may demodulate the clock coordination signal to obtain a first clock signal, and the first clock signal may be used as the working clock of the electronic device 10 for use by the frequency shift modulation module 110 of the electronic device 10.
  • the electronic device 10 may be designed not to include a crystal oscillator for generating a clock signal. Since a crystal oscillator is not required, the power consumption of the electronic device 10 is relatively small.
  • the excitation signal may be a carrier signal that can be modulated.
  • the frequency shift modulation module 110 may be used to obtain the data to be sent from the data storage module 120 when receiving the excitation signal, and modulate the excitation signal according to the data to be sent and the first clock signal to obtain a wireless communication signal.
  • the data to be sent may include at least one bit of data representing relevant information of the electronic device. Taking the electronic device 10 as an electronic tag as an example, the data to be sent may include a binary string composed of multiple bits of data representing the identification of the electronic tag, and the data to be sent may be pre-stored in the data storage module 120.
  • the excitation signal may be modulated by first frequency shifting the excitation signal, and the degree of frequency shifting may be determined by the frequency of the first clock signal and the excitation signal. Then, the wireless communication signal obtained after the frequency shifting may be output to the air interface using the backscattering technology of the prior art.
  • the frequency of the wireless communication signal obtained after the frequency shift modulation may be different from the excitation signal, thereby avoiding the excitation signal from interfering with the reception of the wireless communication signal.
  • the specific modulation method may refer to the relevant description below. This makes it unnecessary for the communication object of the electronic device 10 to perform interference suppression, thereby reducing the power consumption of the communication object of the electronic device 10.
  • the clock acquisition module demodulates the received clock coordination signal to obtain the first clock signal, and the first clock signal is used as the working clock of the electronic device, so that the electronic device does not need to generate the clock itself, which can reduce the power consumption of the electronic device;
  • the clock acquisition module outputs the first clock signal to the frequency shift modulation module, and the frequency shift modulation module obtains the data to be sent from the data storage module when receiving the excitation signal, modulates the excitation signal according to the data to be sent and the first clock signal, obtains the wireless communication signal and sends it, wherein the power consumption of the wireless communication signal modulated by the excitation signal is much less than the power consumption of the electronic device actively generating the wireless communication signal, thereby further reducing the power consumption of the electronic device, so that the electronic device as an IoT terminal can have lower power consumption.
  • the frequency of the wireless communication signal is different from the frequency of the excitation signal, so the wireless communication signal and the excitation signal do not interfere with each other, and for other devices in the Internet of Things IoT that need to receive the wireless communication signal, no additional interference removal operation is required, that is, the hardware conditions of other devices in the Internet of Things IoT that need to receive the wireless communication signal are lower, so that the overall power consumption and cost of the IoT including the electronic device are also lower, which is convenient for low-cost realization of a wide range of passive Internet of Things.
  • FIG6 is a schematic diagram showing a frequency domain of a signal received and generated by an electronic device according to an embodiment of the present application.
  • the clock coordination signal is a modulated signal
  • the frequency of the first clock signal is equal to the modulation frequency of the clock coordination signal
  • the Internet of Things may include a signal generating subsystem that can wirelessly communicate with the electronic device 10 (see FIG. 7b), the signal generation subsystem can generate an original clock signal and can modulate the original clock signal to obtain a clock coordination signal.
  • the original clock signal can be any carrier with a certain frequency generated by a waveform generator.
  • the original clock signal can be modulated by the amplitude-shift keying (ASK) or frequency-shift keying (FSK) modulation method of the prior art.
  • ASK amplitude-shift keying
  • FSK frequency-shift keying
  • the center frequency of the obtained clock coordination signal can be fa
  • the modulation frequency can be fb-fa
  • the modulation frequency can be fb-fa
  • the signal generated by the modulation can have 2 frequencies, namely fa and fb.
  • the specific values of fa and fb can be set according to the application scenario requirements, and this application does not limit this.
  • the clock coordination signal can be sent to the air interface, and the electronic device 10 can receive the clock coordination signal through the air interface.
  • the clock acquisition module 130 can demodulate the clock coordination signal to obtain the modulation frequency fb-fa of the clock coordination signal, that is, the first clock signal, which is used as the clock of the electronic device, and its frequency max(f) is equal to the modulation frequency fb-fa of the clock coordination signal.
  • the clock acquisition module can demodulate and obtain a first clock signal with a certain frequency, thereby providing a stable working clock for the electronic device, making it possible for the electronic device to not be provided with a crystal oscillator.
  • the signal generation subsystem (see FIG. 7 b for an example) can also be used to provide an excitation signal.
  • the frequency f1 of the excitation signal can be set according to the application scenario requirements, and the present application does not limit its specific value.
  • the excitation signal can be sent to the air interface, and the electronic device 10 can receive the excitation signal through the air interface.
  • the wireless communication signal includes a first frequency and a second frequency, and the center frequency of the wireless communication signal is between the first frequency and the second frequency.
  • the frequency shift modulation module 110 is specifically configured to:
  • the first frequency difference is the difference between the center frequency of the wireless communication signal and the first frequency, and the difference between the frequency of the excitation signal and the center frequency is greater than the first frequency difference;
  • a second clock signal and a third clock signal are obtained according to the excitation signal, the first clock signal and the center frequency, wherein the sum of the frequency of the second clock signal and the frequency of the excitation signal is equal to the first frequency, and the sum of the frequency of the third clock signal and the frequency of the excitation signal is equal to the second frequency;
  • the excitation signal is modulated according to the second clock signal, the third clock signal and the data to be sent to obtain a wireless communication signal and send it out. Different frequencies of the wireless communication signal correspond to different values of the data to be sent.
  • the excitation signal may trigger the frequency shift modulation module 110 to obtain the data to be sent from the data storage module 120.
  • the obtained data to be sent may be at least one bit of binary data.
  • the wireless communication signal modulated by the frequency shift modulation module 110 is a signal of a frequency that complies with the wireless communication protocol standard.
  • wireless communication protocols such as Bluetooth, wireless fidelity (Wi-Fi), Zigbee, long range radio (LoRa), narrow band internet of things (NB-IoT), spark link, etc.
  • Wi-Fi wireless fidelity
  • Zigbee Zigbee
  • LuRa long range radio
  • NB-IoT narrow band internet of things
  • spark link etc.
  • Different protocol standards specify different frequencies, and the specific protocol to be used can be pre-set according to the application scenario requirements.
  • the following uses the Bluetooth protocol and the wireless communication signal obtained as a Bluetooth signal as an example.
  • the wireless communication signal obtained by the frequency shift modulation module 110 of the embodiment of the present application is a Bluetooth signal
  • it may also include a first frequency and a second frequency
  • the center frequency of the wireless communication signal is located between the first frequency and the frequency.
  • the preset value range of the difference between the center frequency f2 and the first frequency i.e., the first frequency difference ⁇ f
  • the value of the first frequency can be equal to f2- ⁇ f
  • the value of the second frequency can be equal to f2+ ⁇ f.
  • the first frequency and the second frequency can be two frequencies with the same frequency band and different frequency points.
  • the frequency shift modulation module 110 can obtain the frequency f1 of the excitation signal.
  • the center frequency f2 can be determined first, so that the difference between the frequency f1 of the excitation signal and the center frequency f2 is greater than the first frequency difference ⁇ f. Since the specific value of the first frequency difference ⁇ f has not yet been determined, therefore, under the premise of knowing the preset value range of the first frequency difference ⁇ f [225kHz-500kHz], the difference between the frequency f1 of the excitation signal and the center frequency f2 can be made greater than the maximum value within the preset value range. That is, select an f2 so that f1-f2>500kHz. For example, when f1 is 2479MHz, f2 can be selected as 2480MHz.
  • the second clock signal and the third clock signal are the clocks used when the excitation signal is shifted to the first frequency and the second frequency, respectively.
  • max(f) is the frequency of the first clock signal
  • the frequency max(f)/m of the second clock signal is 0.5MHz
  • the frequency max(f)/n of the third clock signal is 1.5MHz
  • the frequency f1 of the excitation signal is 2479MHz
  • a wireless communication signal can be modulated.
  • the frequency of the wireless communication signal modulated in this way is different from the frequency of the excitation signal, which can avoid the excitation signal from interfering with the wireless communication signal.
  • the data to be sent includes at least one bit of data
  • the excitation signal is modulated according to the second clock signal, the third clock signal, and the data to be sent to obtain and send a wireless communication signal, including:
  • the excitation signal is modulated based on the second clock signal to obtain a wireless communication signal with a frequency equal to the first frequency and send it out;
  • the excitation signal is modulated based on the third clock signal to obtain a wireless communication signal with a frequency equal to the second frequency and send it out.
  • the excitation signal in the data to be sent, when the value of the current bit of data is 0, the excitation signal is modulated based on the second clock signal to obtain a wireless communication signal with a frequency equal to the first frequency and send it out; in the data to be sent, when the value of the current bit of data is 1, the excitation signal is modulated based on the third clock signal to obtain a wireless communication signal with a frequency equal to the second frequency and send it out.
  • the order of the frequencies of the wireless communication signals sent may be the first frequency-the second frequency-the first frequency-the second frequency.
  • the data to be sent "0" can be demodulated, and for the wireless communication signal of the second frequency, the data to be sent "1" can be demodulated, so that when the wireless communication signal of the first frequency-second frequency-first frequency-second frequency is received, the data to be sent 0101 can be restored.
  • the modulation of the wireless communication signal can be completed according to the numerical characteristics of the data to be sent.
  • the clock coordination signal is modulated based on the clock signal, it has a high energy content.
  • it can also be used to generate electrical energy to power the electronic device. Since the power consumption of the electronic device is low, when the electrical energy generated by the clock coordination signal is sufficient for the electronic device to use, the electronic device can be a passive physical device, allowing the electronic device to be used in more application scenarios where charging is inconvenient.
  • a wireless charging module may be further provided in the electronic device 10.
  • Fig. 7a shows an exemplary structural diagram of the electronic device 10 according to an embodiment of the present application.
  • the electronic device further includes a wireless charging module 140 , and the wireless charging module 140 is used to convert the received clock coordination signal into electrical energy to power the electronic device.
  • the wireless charging module 140 can be implemented based on existing technologies, and can be connected to each module inside the electronic device respectively, so as to provide power for each module.
  • FIG. 7 b shows an exemplary structural diagram of the communication system according to an embodiment of the present application.
  • the communication system includes a signal generating subsystem 20, a receiving module 30 and the electronic device 10 described above.
  • the signal generating subsystem 20 is used to modulate the original clock signal to obtain a clock coordination signal, send out the clock coordination signal, and send out an excitation signal;
  • the electronic device 10 receives the clock coordination signal and the excitation signal, generates a wireless communication signal according to the clock coordination signal, the excitation signal and the data to be sent, and sends it out;
  • the receiving module 30 is used to receive wireless communication signals and demodulate them to obtain data to be sent.
  • the communication system may include a signal generating subsystem 20, a receiving module 30, and an electronic device 10, all of which can send signals to an air interface and receive signals from an air interface.
  • the clock coordination signal and the excitation signal may have the same source, that is, The same hardware device is generated.
  • both the wireless communication signal and the excitation signal can be received from the air interface, but since the wireless communication signal and the excitation signal have different frequencies, the excitation signal can be filtered out by frequency domain filtering to obtain an interference-free wireless communication signal.
  • Frequency domain filtering can be implemented based on existing technologies and has a low implementation cost, so the performance requirements for the receiving module are also low, which facilitates the low-cost implementation of a wide range of passive Internet of Things.
  • the original clock signal is modulated by the signal generating subsystem to obtain a clock coordination signal, and the clock coordination signal is sent out, and used to send out an excitation signal, so that the electronic device only undertakes the signal modulation work, and does not need to generate a clock and a modulated carrier, so that the electronic device can be crystal-free, reducing the power consumption of the electronic device;
  • the clock coordination signal and the excitation signal are received by the electronic device, and a wireless communication signal is generated and sent according to the clock coordination signal, the excitation signal and the data to be sent, and the receiving module receives the wireless communication signal and demodulates to obtain the data to be sent, so that the transmission of the data to be sent can be completed, and there is no co-frequency interference between the wireless communication signal and the excitation signal, which can reduce the hardware cost of the receiving module.
  • the communication system of the embodiment of the present application can support passive electronic devices as communication nodes. While reducing the power consumption of electronic devices, the overall power consumption of the communication system is also reduced, which is convenient for low-cost realization of a wide range of passive Internet of Things.
  • one or both of the signal generating subsystem and the receiving module are disposed on the same device, and neither the signal generating subsystem nor the receiving module is disposed on the electronic device.
  • FIG8 shows an exemplary application scenario of a communication system according to an embodiment of the present application.
  • the Internet of Things IoT includes three IoT nodes, namely, an electronic device 10, an electronic device 40, and an electronic device 50, all of which have wireless communication functions.
  • the signal generating subsystem 20 in the communication system can be set on the electronic device 40, and the receiving module 30 can be set on the electronic device 50.
  • the electronic device 10 and the electronic device 50 can support the same wireless communication protocol, such as the Bluetooth protocol.
  • the electronic device 10 may be an electronic tag, which may be set on an IoT object, such as clothing, furniture, packages, etc., which are inconvenient to charge frequently.
  • the electronic device 40 may be a signal source, such as a waveform generator, or a Wi-Fi router, etc.
  • the electronic device 50 may be a smart phone, a netbook, a tablet computer, a laptop, a wearable electronic device (such as a smart bracelet, a smart watch, etc.), a TV, a virtual reality device, a stereo, etc.
  • Figure 9 shows a schematic diagram of various signals transmitted in a communication system in a frequency domain in an exemplary application scenario according to an embodiment of the present application.
  • the clock coordination signal and the excitation signal are transmitted to the air interface in the form of electromagnetic waves for reception and use by the electronic device 10.
  • the frequency max(f)/m of the second clock signal can be 0.5MHz
  • the frequency max(f)/n of the third clock signal can be 1.5MHz.
  • the wireless communication signal can be a Bluetooth signal, and is transmitted to the air interface for reception and use by the receiving module 30.
  • the receiving module 30 can demodulate the wireless communication signal, that is, parse and obtain the data to be sent.
  • the electronic device 10 in this application scenario obtains the clock through the air interface, so that the electronic device 10 does not need a crystal oscillator, and the power consumption of the electronic device 10 can be reduced to less than 10uW.
  • the clock coordination signal is also used to generate electric energy to power the electronic device 10, the electronic device 10 can be battery-free.
  • the wireless communication signal emitted by the electronic device 10 can be received based on commercial Bluetooth devices such as mobile phones and tablets, greatly expanding the application of passive Internet of Things.
  • the signal generation subsystem is more flexible to set up.
  • the hardware cost of the signal generation subsystem is lower.
  • the clock coordination signal includes at least two frequencies, and the frequency of the excitation signal is the same as any one of the frequencies included in the clock coordination signal.
  • the frequency of the excitation signal can be the same as any frequency included in the clock coordination signal.
  • excitation signal and the clock coordination signal are signals of the same frequency band
  • common wireless communication devices such as Wi-Fi routers or Bluetooth devices can support the functions of the signal generation subsystem, making the implementation cost of the Internet of Things lower.
  • FIG. 10 shows an exemplary structural diagram of a signal generating subsystem according to an embodiment of the present application.
  • the signal generation subsystem 20 includes a clock module 210 and an excitation module 220.
  • the clock module 210 is used to modulate the original clock signal to obtain a clock coordination signal and send out the clock coordination signal;
  • the excitation module 220 is used to send an excitation signal
  • one or more of the excitation module 220 , the clock module 210 , and the receiving module 30 are set on the same device, and the excitation module 220 , the clock module 210 , and the receiving module 30 are not set on the electronic device 10 .
  • the clock coordination signal and the excitation signal may also have different sources, that is, they are generated by two different hardware devices in the signal generating subsystem 20, for example, the clock coordination signal is generated by the clock module 210, and the excitation signal is generated by the excitation module 220.
  • the clock module 210 and the excitation module 220 may be arranged on the same device, or may be arranged on different devices, that is, one or more of the excitation module 220, the clock module 210, and the receiving module 30 are arranged on the same device, and the excitation module 220, the clock module 210, and the receiving module 30 are not arranged on the electronic device 10.
  • FIG11 is a schematic diagram showing, in the frequency domain, various signals transmitted in a communication system in an exemplary application scenario according to an embodiment of the present application.
  • the clock module 210 and the excitation module 220 are both provided on the electronic device 40.
  • the maximum frequency of the clock coordination signal can be set to be lower than the first threshold, for example, the first threshold is 1 GHz, at which time the transmission power of the clock coordination signal is relatively high, which can reach 35 dBm, so the communication distance of the clock coordination signal is also greater.
  • the clock coordination signal and the excitation signal are transmitted to the air interface in the form of electromagnetic waves for reception and use by the electronic device 10.
  • the frequency max(f)/m of the second clock signal can be 0.5MHz
  • the frequency max(f)/n of the third clock signal can be 1.5MHz.
  • the wireless communication signal can be a Bluetooth signal, and is transmitted to the air interface for reception and use by the receiving module 30.
  • the receiving module 30 can demodulate the wireless communication signal, that is, parse and obtain the data to be sent.
  • the electronic device 10 in this application scenario obtains the clock through the air interface, so that the electronic device 10 does not need a crystal oscillator, and the power consumption of the electronic device 10 can be reduced to less than 10uW.
  • the clock coordination signal is also used to generate electric energy to power the electronic device 10, the electronic device 10 can be battery-free.
  • the wireless communication signal emitted by the electronic device 10 can be received based on commercial Bluetooth devices such as mobile phones and tablets, greatly expanding the application of passive Internet of Things.
  • the frequency of the clock coordination signal can be adjusted, so that the communication distance of the clock coordination signal can be maintained at a larger value.
  • FIG. 12 shows another exemplary application scenario according to an embodiment of the present application.
  • the Internet of Things IoT includes three IoT nodes, namely, electronic device 10, electronic device 60, and electronic device 70, all of which have wireless communication functions.
  • the clock module 210 and the receiving module 30 in the communication system can be set on the electronic device 60.
  • the excitation module 220 can be set on the electronic device 70.
  • the electronic device 10 and the electronic device 60 can support the same wireless communication protocol, such as the Bluetooth protocol.
  • the electronic device 10 may be an electronic tag, which may be set on an IoT object, such as clothing, furniture, packages, etc., which are inconvenient to charge frequently.
  • the electronic device 60 may be a smart phone, a netbook, a tablet computer, a laptop computer, a wearable electronic device (such as a smart bracelet, a smart watch, etc.), a TV, a virtual reality device, a stereo, etc.
  • the electronic device 70 may be a signal source, such as a waveform generator, or may be a Wi-Fi router, etc.
  • the signal transmission mode in the communication system may be: the electronic device 70 transmits the excitation signal to the electronic device 10; the electronic device 60 transmits the clock coordination signal to the electronic device 10; the electronic device 10 transmits the wireless communication signal to the electronic device 60.
  • the schematic diagram of each signal in the frequency domain can be seen in FIG9 or FIG11 .
  • the device where the excitation module is located is simplified and the hardware implementation cost is lower.
  • the embodiment of the present application provides a signal processing method, which is applied to an electronic device, wherein the electronic device includes a frequency shift modulation module, a data storage module and a clock acquisition module, wherein the data storage module is used to store data to be sent.
  • FIG13 is a schematic diagram showing the flow of the signal processing method according to the embodiment of the present application.
  • the method includes:
  • Step S10 the clock acquisition module demodulates the received clock coordination signal to obtain a first clock signal, and outputs the first clock signal to the frequency shift modulation module, and the first clock signal is used as the working clock of the electronic device;
  • Step S20 when the frequency shift modulation module receives the excitation signal, obtains the data to be stored from the data storage module. Send data, modulate the excitation signal according to the data to be sent and the first clock signal, and output a wireless communication signal.
  • the clock coordination signal is a modulated signal
  • the frequency of the first clock signal is equal to the modulation frequency of the clock coordination signal
  • the wireless communication signal includes a first frequency and a second frequency
  • the center frequency of the wireless communication signal is between the first frequency and the second frequency
  • the frequency shift modulation module receives the excitation signal, obtains the data to be sent from the data storage module, modulates the excitation signal according to the data to be sent and the first clock signal, and outputs the wireless communication signal, including:
  • the center frequency is a difference between the center frequency of the wireless communication signal and the first frequency, and the difference between the frequency of the excitation signal and the center frequency is greater than the first frequency difference;
  • a second clock signal and a third clock signal are obtained according to the excitation signal, the first clock signal and the center frequency, wherein the sum of the frequency of the second clock signal and the frequency of the excitation signal is equal to the first frequency, and the sum of the frequency of the third clock signal and the frequency of the excitation signal is equal to the second frequency;
  • the excitation signal is modulated according to the second clock signal, the third clock signal and the data to be sent to obtain and send out the wireless communication signal, and different frequencies of the wireless communication signal correspond to different values of the data to be sent.
  • the data to be sent includes at least one bit of data
  • the modulating the excitation signal according to the second clock signal, the third clock signal, and the data to be sent to obtain and send the wireless communication signal includes:
  • the excitation signal is modulated based on the second clock signal to obtain a wireless communication signal having a frequency equal to the first frequency and send it out;
  • the excitation signal is modulated based on the third clock signal to obtain a wireless communication signal with a frequency equal to the second frequency and send it out.
  • the clock coordination signal is also used to generate electric energy for powering the electronic device.
  • the electronic device further includes a wireless charging module
  • the method further includes: the wireless charging module converts the received clock coordination signal to obtain electrical energy to power the electronic device.
  • the electronic device includes an electronic tag.
  • An embodiment of the present application provides a communication method, which is applied to a communication system, wherein the communication system includes a signal generating subsystem, a receiving module, and one or more electronic devices of the above first aspect or multiple possible implementations of the first aspect.
  • Figure 14 shows a schematic diagram of the process of the communication method according to an embodiment of the present application.
  • the method includes:
  • Step S30 the signal generating subsystem modulates the original clock signal to obtain a clock coordination signal, sends the clock coordination signal, and sends an excitation signal;
  • Step S40 the electronic device receives the clock coordination signal and the excitation signal, generates a wireless communication signal according to the clock coordination signal, the excitation signal and the data to be sent, and sends it;
  • Step S50 the receiving module receives the wireless communication signal and demodulates it to obtain the data to be sent.
  • one or both of the signal generating subsystem and the receiving module are arranged on the same device, and neither the signal generating subsystem nor the receiving module is arranged on the electronic device.
  • the clock coordination signal includes at least two frequencies, and the frequency of the excitation signal is the same as any one of the frequencies included in the clock coordination signal.
  • the signal generating subsystem includes a clock module and an excitation module, and the signal generating subsystem modulates the original clock signal to obtain a clock coordination signal, sends the clock coordination signal, and sends an excitation signal, including:
  • the clock module modulates the original clock signal to obtain the clock coordination signal, and sends the clock coordination signal;
  • the excitation module sends the excitation signal
  • one or more of the excitation module, the clock module, and the receiving module are arranged on the same device, and the excitation module, the clock module, and the receiving module are not arranged on the electronic device.
  • each square frame in the flow chart or block diagram can represent a part of a module, program segment or instruction, and a part of the module, program segment or instruction includes one or more executable instructions for realizing the logical function of the specification.
  • the functions marked in the square frame can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square frames can actually be executed substantially in parallel, and they can also be executed in reverse order sometimes, depending on the functions involved.
  • each box in the block diagram and/or flowchart, and the combination of boxes in the block diagram and/or flowchart can be implemented by hardware (such as circuits or ASICs (Application Specific Integrated Circuit)) that perform the corresponding functions or actions, or can be implemented by a combination of hardware and software, such as firmware.

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Abstract

La présente demande concerne un dispositif électronique, un système de communication, un procédé de traitement de signal et un procédé de communication. Le dispositif électronique comprend un module de modulation par déplacement de fréquence, un module de stockage de données et un module d'acquisition d'horloge, le module d'acquisition d'horloge étant utilisé pour effectuer une démodulation selon un signal de collaboration d'horloge reçu afin d'obtenir un premier signal d'horloge, et délivrer le premier signal d'horloge au module de modulation par déplacement de fréquence, le premier signal d'horloge servant d'horloge de travail du dispositif électronique ; et le module de modulation par déplacement de fréquence étant utilisé pour, lors de la réception d'un signal d'excitation, acquérir des données à envoyer auprès du module de stockage de données, moduler le signal d'excitation en fonction desdites données et du premier signal d'horloge pour obtenir un signal de communication sans fil, et envoyer le signal de communication sans fil, la fréquence du signal de communication sans fil étant différente de la fréquence du signal d'excitation. Le dispositif électronique des modes de réalisation de la présente demande présente une consommation d'énergie relativement faible lorsqu'il sert de terminal de l'internet des objets ; de plus, la consommation d'énergie globale et le coût de l'internet des objets comprenant le dispositif électronique sont également relativement faibles, ce qui contribue à réaliser l'internet des objets passif étendu à faible coût.
PCT/CN2024/071822 2023-04-18 2024-01-11 Dispositif électronique, système de communication, procédé de traitement de signal et procédé de communication Pending WO2024217084A1 (fr)

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WO2020253660A1 (fr) * 2019-06-19 2020-12-24 华为技术有限公司 Procédé et dispositif de synchronisation
WO2021119941A1 (fr) * 2019-12-16 2021-06-24 华为技术有限公司 Procédé de communication par rétrodiffusion et appareil de communication
CN113746506A (zh) * 2020-05-29 2021-12-03 罗伯特·博世有限公司 反向散射通信系统
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US20040198233A1 (en) * 2002-10-02 2004-10-07 Pratt Richard M. Radio frequency identification devices, backscatter communication device wake-up methods, communication device wake-up methods and a radio frequency identification device wake-up method
US20100295682A1 (en) * 2005-10-02 2010-11-25 Visible Assets, Inc. Radio tag and system
US20220077888A1 (en) * 2018-12-19 2022-03-10 Ares Trading S.A. Communication apparatus for use with electronic communication element, electronic communication element and uses thereof
WO2020253660A1 (fr) * 2019-06-19 2020-12-24 华为技术有限公司 Procédé et dispositif de synchronisation
WO2021119941A1 (fr) * 2019-12-16 2021-06-24 华为技术有限公司 Procédé de communication par rétrodiffusion et appareil de communication
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