47 results about "Backscatter modulation" patented technology

The invention discloses a LoRa-based parallel backscatter communication method and system. The method comprises the following steps: transmitting a single-tone radio frequency source signal as a signal excitation source; designing a backscattering label, and performing backscattering modulation processing on the environmental perception data in combination with the signal excitation source to obtain a modulated standard LoRa data packet; and the receiver presets the center frequency of a communication link, and performs frequency band distinguishing and demodulation processing on the modulated standard LoRa data packet to complete parallel backscatter communication of the LoRa data. According to the invention, while a parallel backscattering LoRa communication system compatible with commercial LoRa equipment is realized, the throughput of the system is improved, and frequency division multiple access parallel transmission is realized. The LoRa-based parallel backscatter communication method and system can be widely applied to the technical field of parallel backscatter communication.

An apparatus comprising:energy harvesting circuitry;backscatter modulation circuitry powered at least partially using energy provided by the energy harvesting circuitry;a first antenna element coupled via a first feed to the backscatter modulation circuitry; anda second antenna element coupled via a second feed to the energy harvesting circuitry,wherein the apparatus is configured to receive radio signals simultaneously, at the same frequency, at the backscatter modulation circuitry via the first antenna element and at the energy harvesting circuitry via the second antenna element.

This disclosure provides methods, components, devices and systems for frequency-translated backscatter modulation for ambient power (AMP) tags. In some examples, a user equipment (UE) may transmit an excitation signal to an AMP tag via a first subchannel of a channel bandwidth. The AMP tag may transmit a backscattered tag response to the UE via a second subchannel of the channel bandwidth based on receiving the excitation waveform. In some examples, the AMP tag may modulate information with the backscattered tag response by translating the excitation signal to the second subchannel such that the backscattered tag response does not interfere with the excitation waveform. The second subchannel that includes the backscattered tag response may indicate one or more information bits associated with the backscattered tag response. The UE may decode information bits from the backscattered tag response using an energy detection operation.

The invention discloses an information sending method, a configuration method, devices and communication equipment, and belongs to the technical field of communication, and the information sending method comprises the steps that first equipment obtains first information; determining or executing a first behavior according to the first information; the first behavior comprises the steps of generating a first signal, generating a backscatter modulation signal according to the first signal and a received radio frequency carrier signal, and sending the backscatter modulation signal.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a backscattering radio may transmit capability information relating to at least one of a polarization conversion capability of the backscattering radio or a backscattering modulation capability of the backscattering radio. The backscattering radio may communicate with a network node in accordance with the capability information. Numerous other aspects are described.

The invention discloses a radio frequency tag backscattering modulation method and device based on impedance switching, which are applied to the technical field of radio frequency identification, and the method comprises the following steps: determining a backscattering coefficient of a radio frequency tag to be adjusted; performing frequency scanning on the working area of the radio frequency tag to be adjusted to obtain a multi-frequency reflection signal in the working area; performing multipath analysis and feature extraction processing on the multi-frequency reflection signals in sequence to obtain multipath reflection feature data; performing fusion processing on the multi-path reflection characteristic data and the backscattering coefficient to obtain a backscattering value; inputting the deviation angle of the radio frequency tag to be adjusted and the plurality of backscattering values into the constructed directional impedance optimization model to obtain a directional compensation coefficient; performing backscattering modulation processing on the to-be-adjusted radio frequency tag based on the directivity compensation coefficient to obtain an impedance switching parameter; and executing an impedance switching strategy corresponding to the impedance switching parameter. According to the method provided by the embodiment of the invention, reliable transmission of the radio frequency temperature measurement data can be ensured.

A method for communicating directly with commodity Wi-Fi transceivers (TRXs) via backscatter modulation in an integrated tag device is provided. The method includes sensing an incident Wi-Fi-compliant wake-up signal. The method than reflects the incident Wi-Fi-complaint wake-up signal by encoding data from the tag device such that the reflected signal follows the Wi-Fi standard compliant and can be decoded by another WiFi-device. An integrated device includes a downlink Wi-Fi compatible wake-up receiver that checks timing of Wi-Fi compatible signals for a wake-up packet. The device has a modulator that is turned on in response to the wake-up packet and a mixer in the modulator hat mixes tag data with a payload packet from received Wi-Fi payload. Backscatter switches backscatter the response.

The application discloses an impedance-switching-based radio frequency tag backscattering modulation method and device, and is applied to the field of radio frequency identification technology, and the method comprises the following steps: determining a backscattering coefficient of a radio frequency tag to be adjusted; performing frequency scanning on a working area of the radio frequency tag to be adjusted to obtain multi-frequency reflection signals in the working area; sequentially performing multi-path analysis and feature extraction processing on the multi-frequency reflection signals to obtain multi-path reflection feature data; performing fusion processing on the multi-path reflection feature data and the backscattering coefficient to obtain a backscattering value; inputting an offset angle of the radio frequency tag to be adjusted and the backscattering value into a constructed directional impedance optimization model to obtain a directional compensation coefficient; based on the directional compensation coefficient, performing backscattering modulation processing on the radio frequency tag to be adjusted to obtain an impedance switching parameter; and executing an impedance switching strategy corresponding to the impedance switching parameter. The method provided in the application can ensure reliable transmission of radio frequency temperature measurement data.

The invention discloses a signal transmission method and device, communication equipment and a readable storage medium, and belongs to the technical field of communication, and the signal transmission method comprises the steps that first equipment carries out backscattering modulation according to a to-be-transmitted information bit and a second signal to obtain a first signal; wherein the second signal is a carrier signal of the first signal; the first signal comprises at least one first signal unit, each first signal unit comprises two chirp spread spectrum CSS symbols, the average powers or reflection coefficients of the two CSS symbols are different, and other parameters, except the average powers and the reflection coefficients, of the two CSS symbols are the same; the information bits to be transmitted are modulated through the frequency of each CSS symbol in each first signal unit; and sending the first signal.

The present application belongs to the technical field of communications. Disclosed are a signal transmission method and apparatus, and a communication device and a readable storage medium. The signal transmission method in the embodiments of the present application comprises: a first device modulating an information bit to be transmitted, so as to obtain a first signal, wherein the first signal is obtained by adding a first part and a second part, the first part is a signal obtained by performing frequency shifting of a first frequency and filtering on a second signal, the second part is a signal obtained by performing frequency shifting of a second frequency and filtering on the second signal, the frequency shift directions of the first part and the second part are opposite, the sum of the first frequency and the second frequency is equal to the bandwidth size of the second signal, the first frequency and the second frequency form a frequency pair associated with said information bit and used for frequency shifting, and the first signal is a backscatter modulation signal of the second signal; and sending the first signal.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) can receive a physical random access channel (PRACH) configuration indicating a set of resources for a random access channel (RACH) preamble. The UE can receive an input radio frequency (RF) signal. The UE can select a start frequency for a frequency hopping mode for the RACH preamble. The UE can transmit the RACH preamble in the set of resources at the starting frequency and according to the frequency hopping pattern, wherein transmitting the RACH preamble includes backscatter modulation of the input RF signal. Numerous other aspects are described.

Methods, systems, and devices are described for wireless communication that provide backscatter modulation capabilities that signal a user equipment (UE) or other devices that support backscatter modulation. Backscatter modulation capabilities may include frequency shift capabilities, and one or more backscatter capabilities may be signaled in a capability report sent in response to a signal from a network node or other interrogation device or reader. The capability report may indicate whether backscatter modulation with a frequency shift is supported at the UE. The capability report may also indicate one or more types of frequency shifts supported at the UE. The network node may receive the capability report and schedule the UE for communication based on the reported capability.

An example method involves receiving a plurality of data streams, including a first data stream and a second data stream, and an incident carrier signal. The first data stream is packetized into a first set of Bluetooth packets, and the second data stream into a second set of Bluetooth packets. These Bluetooth packets are then backscattered by a backscatter modulator using an incident carrier signal, with the first set of packets backscattered in a first Bluetooth channel and the second set in a second Bluetooth channel. In this manner, a backscatter device may backscatter into multiple Bluetooth channels simultaneously.

The present invention relates to a communication method, a terminal, a device, an apparatus, a system, a medium, and a program. The method comprises: receiving a CW sent by a CWN; on the basis of a carrier frequency of the CW, determining a reflected signal based on backscattering modulation, wherein the carrier frequency is located in a downlink frequency spectrum, and the frequency of the reflected signal is located in an uplink frequency spectrum corresponding to the downlink frequency spectrum, or, the carrier frequency is located in an uplink frequency spectrum, and the frequency of the reflected signal is located in a downlink frequency spectrum corresponding to the uplink frequency spectrum; and sending the reflected signal to a node device, wherein a terminal is an Ambient-Internet of Things (IoT) terminal for acquiring energy from an ambient. In the method of the present invention, upon receiving a CW, an Ambient-IoT terminal can determine a corresponding reflected signal, such that a carrier frequency of the CW and the frequency of the reflected signal are respectively located in an uplink frequency spectrum and a downlink frequency spectrum, thereby achieving good isolation of a downlink CW signal and an uplink transmit signal in a frequency domain, and improving the receiving performance of a system and reducing the complexity of a base station or an intermediate node.

This disclosure provides methods, components, devices and systems for frequency-translated backscatter modulation for ambient power (AMP) tags. In some examples, a user equipment (UE) may transmit an excitation signal to an AMP tag via a first subchannel of a channel bandwidth. The AMP tag may transmit a backscattered tag response to the UE via a second subchannel of the channel bandwidth based on receiving the excitation waveform. In some examples, the AMP tag may modulate information with the backscattered tag response by translating the excitation signal to the second subchannel such that the backscattered tag response does not interfere with the excitation waveform. The second subchannel that includes the backscattered tag response may indicate one or more information bits associated with the backscattered tag response. The UE may decode information bits from the backscattered tag response using an energy detection operation.

The invention discloses a signal transmission method and device, communication equipment and a readable storage medium, and belongs to the technical field of communication, and the signal transmission method comprises the steps that first equipment modulates information bits to be transmitted to obtain a first signal; wherein the first signal is obtained by adding a first part and a second part, the first part is a signal obtained by performing frequency shift and filtering of a first frequency on the second signal, and the second part is a signal obtained by performing frequency shift and filtering of a second frequency on the second signal; the frequency shift directions of the first part and the second part are opposite, the sum of the first frequency and the second frequency is equal to the bandwidth of the second signal, and the first frequency and the second frequency are frequency pairs associated with the information bits to be transmitted and used for frequency shift. The first signal is a backscattering modulation signal of the second signal; and sending the first signal.

Methods, systems, and devices for wireless communication are described. Bistatic communications may relate to devices with energy harvesting (EH) capabilities. An interrogation network node (e.g., a network node that sends an interrogation signal to an EH-capable device) or a reader network node (e.g., a network node that receives a backscatter response) may send a scheduling request to a scheduling network node. Upon receiving a scheduling request, a scheduling network node may send two grants. One of these grants grants scheduling transmissions from the source network entity to the EH-capable device. The other grants scheduling of reception of the transmitted backscatter response from the EH-capable device. The source network node may communicate the transmission to the EH-capable device according to the first grant, and the reader network node may receive a backscatter response to the transmission from the EH-capable device according to the second grant.

Provided is a position method. The method is performed by a positioning device. The method includes: positioning a zero-power tag device based on a first radio signal from the zero-power tag device; wherein the first radio signal is actively transmitted by the zero-power tag device in response to the zero-power tag device receiving a second radio signal, or the first radio signal is passively transmitted via backscatter modulation on the second radio signal; wherein the second radio signal is used to energize the zero-power tag device or wake up the zero-power tag device.

The application provides a self-sensing and intelligent early warning method for stress of numerically controlled machining aluminum alloy shell parts, and particularly relates to the online intelligent monitoring and early warning technical field of numerically controlled machining. The method forms a conformal self-sensing array by distributing and embedding micro piezoelectric ceramic units on the surface of the aluminum alloy shell part, generates a piezoelectric charge signal, sends a self-sensing signal containing stress information after radio frequency identification backscattering modulation, receives the signal and synchronously acquires real-time machining parameters of the numerically controlled machining system, generates a real-time fusion feature vector through fusion processing of a self-adaptive weight distribution model, inputs a pre-trained pulse neural network model, outputs a stress risk probability value, synchronizes to a digital twin model for three-dimensional thermal map visualization display, and generates an execution hierarchical early warning or machining control instruction according to the stress risk probability value and a dynamic early warning threshold. The application realizes real-time, passive and distributed sensing and dynamic risk assessment of the machining stress state, and improves the timeliness of early warning and the self-controllability of machining.

The invention discloses a positioning method and device, equipment, a storage medium and a chip, and belongs to the technical field of mobile communication. The method is executed by a terminal device, comprising: positioning a zero power consumption tag device according to a first wireless signal sent by the zero power consumption tag device (601); the first wireless signal is actively transmitted after the zero-power-consumption tag equipment receives the second wireless signal or is passively transmitted by performing backscatter modulation on the second wireless signal; the second wireless signal is used for supplying energy to the zero-power-consumption tag equipment or waking up the zero-power-consumption tag equipment. According to the scheme, the energy consumption of equipment positioning is saved, and meanwhile, the application scene of equipment positioning is expanded.

The present application relates to the technical field of communications, and discloses an information sending method and apparatus, an information configuration method and apparatus, and a communication device. The information sending method of embodiments of the present application comprises: a first device acquiring first information; on the basis of the first information, determining or executing a first behavior, wherein the first behavior comprises: generating a first signal; on the basis of the first signal and a received radio frequency carrier signal, generating a backscatter modulation signal; and sending the backscatter modulation signal.

Provided are a communication method and a communication device. The method comprises: a first device sends a first signal, wherein the first signal is used for providing energy for a second device and / or used for the second device to perform backscatter modulation, and the first signal is generated on the basis of a first spreading sequence in a spreading sequence set.

Techniques for carrier transmission and energy harvesting in passive or semi-passive backscatter devices are described. An apparatus may be configured to transmit information indicating a power preference of the apparatus to a first network node; receiving a radio frequency (RF) signal from the first network node, wherein the RF signal is based on the information; and transmitting data to one or more of the first network node or the second network node based on backscatter modulation of the RF signal.

The present application relates to the technical field of communications, and discloses a signal transmission method and apparatus, a communication device, and a readable storage medium. The signal transmission method in embodiments of the present application comprises: a first device performing backscatter modulation on the basis of an information bit to be transmitted and a second signal, so as to obtain a first signal, wherein the second signal is a carrier signal of the first signal, the first signal comprises at least one first signal unit, each first signal unit comprises two chirp spread spectrum (CSS) symbols, the average powers or reflection coefficients of the two CSS symbols are different, the parameters of the two CSS symbols other than the average power and the reflection coefficient are the same, and said information bit is modulated by means of the frequency of each CSS symbol in each first signal unit; and sending the first signal.

Methods, systems, and devices for wireless communications are described that provide for signaling backscatter modulation capabilities of a user equipment (UE) or other device that supports backscatter modulation. Backscatter modulation capabilities may include frequency shift capabilities, and one or more backscatter capabilities may be signaled in a capability report that is transmitted responsive to a signal from a network node or other interrogating device or reader. The capability report may indicate whether backscatter modulation with frequency shifting is supported or not supported at the UE. The capability report also may indicate one or more types of frequency shifting supported at the UE. The network node may receive the capability report and schedule a UE for communications based on the reported capabilities.

Systems and techniques for wireless communication are provided. For example, an apparatus may receive a physical random access channel (PRACH) configuration from a network entity, the physical random access channel (PRACH) configuration indicating one or more subsets of time-frequency resources from a plurality of different subsets of time-frequency resources. The apparatus may receive a radio frequency (RF) signal from the network entity. The apparatus may further transmit a PRACH signal using a particular subset of time-frequency resources from the one or more subsets of time-frequency resources based on backscatter modulation of the RF signal using a frequency hopping pattern.

The present application belongs to the technical field of communications. Disclosed are a signal transmission method, an information configuration method and apparatus, and a communication device. The signal transmission method in the embodiments of the present application comprises: a first device generating a first signal on the basis of first information, wherein the first signal is a baseband modulation signal; generating a second signal on the basis of the first signal and a received radio frequency carrier signal, wherein the radio frequency carrier signal is a single-tone signal, the second signal is a single-sideband backscatter modulation signal, and the bandwidth of the first signal is the same as the bandwidth of the second signal; and sending the second signal.

RFID tag ICs in a population can adjust the impedance values used to backscatter-modulate reply signals to increase the distribution or spread of backscattered signal parameters, thereby facilitating the recovery of collided tag replies. An RFID tag IC may adjust its impedance value(s) based on a reader command or independently.

The invention discloses a fall detection system based on a BLE backscattering technology, and relates to the technical field of wireless communication. Comprising an acceleration sensing module, a baseband signal generation module, a backscattering modulation module, an energy collection and power supply management module and a terminal information processing system. The acceleration sensing module is used for acquiring three-axis acceleration data; after the baseband signal generation module encapsulates data into a broadcast protocol data unit conforming to the BLE standard, smoothing processing is carried out on the signal through GFSK, and then symbols are mapped into subcarriers with different frequencies through MFSK; the backscattering modulation module switches an impedance unit according to the received subcarriers with different frequencies, and modulates a baseband signal to an environment radio frequency carrier; and the terminal processing system receives and analyzes the BLE broadcast signal and executes a fall detection algorithm. The invention further discloses an implementation method of the fall detection system based on the BLE backscattering technology. The fall detection system based on the BLE backscattering technology has the advantages of being low in power consumption, high in compatibility and small in size.

The invention provides a self-sensing and intelligent early warning method for stress of a numerical control machining aluminum alloy shell part, and particularly relates to the technical field of numerical control machining online intelligent monitoring and early warning. According to the method, micro piezoelectric ceramic units are embedded in the surface of an aluminum alloy shell part in a distributed mode, a conformal self-sensing array is formed, and piezoelectric charge signals are generated; after radio frequency identification back scattering modulation, a self-sensing signal containing stress information is sent; receiving the signal, synchronously obtaining real-time processing parameters of a numerical control processing system, and generating a real-time fusion feature vector through fusion processing of a self-adaptive weight distribution model; inputting a pre-trained pulse neural network model, and outputting a stress risk probability value; synchronizing to a digital twinborn model for three-dimensional thermodynamic diagram visual display; and according to the stress risk probability value and the dynamic early warning threshold value, generating an execution grading early warning or processing control instruction. According to the method, real-time, passive and distributed sensing and dynamic risk assessment of the machining stress state are realized, and the early warning timeliness and the machining autonomous controllability are improved.