794results about "Scatter propogation systems" patented technology

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, a network device can transmit, to a group of passive devices, a continuous wave (CW) signal. The network device can receive, from each passive device of the group of passive devices, at least one backscatter signal, based on the CW signal, at a respective frequency shift. The network device can estimate, based on the at least one backscatter signal, channel information for each passive device of the group of passive devices. The network device can then determine, based on the channel information, a channel for transmitting an energy signal to at least one passive device of the group of passive devices for energy harvesting.

The invention discloses an integrated sensing and backscatter communication method and device based on backscatter, and relates to the technical field of wireless communication, and the method comprises the steps: receiving an open-circuit pilot frequency receiving voltage and a short-circuit pilot frequency receiving voltage generated by a receiving antenna based on a pilot frequency signal; determining a tag antenna mode pilot frequency voltage component and a clutter tag structure combined pilot frequency voltage component, and correspondingly determining a tag antenna mode reflection coefficient and a clutter tag structure combined reflection coefficient based on the tag antenna mode pilot frequency voltage component and the clutter tag structure combined pilot frequency voltage component by adopting a compressed sensing algorithm; and transmitting a data signal to a receiving antenna through the tag by adopting binary phase shift keying, collecting a data receiving voltage, and completing signal demodulation by adopting the data receiving voltage, a tag antenna mode reflection coefficient and a combined reflection coefficient to obtain a bit mapping symbol of the data signal. The backscatter communication is realized through combination of backscatter and tag impedance modulation, and the backscatter communication performance is improved.

A method of back scattering communication includes: determining by a first communication device, time domain resource information for the back scattering communication according to first information; where the first information is identification information of the first communication device, or the first information is identification information of the first communication device and identification information of a serving cell.

The invention relates to the technical field of backscatter communication, and discloses a backscatter method for any multi-frequency Bluetooth carrier, which comprises the following steps: a carrier device can send out carrier signals of multiple frequencies; the label modulates label data into a carrier signal to generate a backscattering signal; an edge device identifies a serial number of a corresponding connection event through a data packet in a specific data channel and sends the serial number of the connection event to a label, and the label calculates a corresponding data channel serial number according to the serial number of the connection event, so that the label can reflect carrier signals of different data channels to a fixed channel; identification fields are arranged in data packets corresponding to the carrier signals and the backscattering signals, and label data are decoded based on identification field contents and load contents of the carrier signals and the backscattering signals. The label can accurately control the reflection channel, and meanwhile label data transmission is supported through a provided coding and decoding mechanism.

This application discloses an information transmission method and apparatus, a first device, and a second device, which belongs to the field of communication technologies. The information transmission method in embodiments of this application includes: sending, by a first device, frequency offset indication information to a second device, where the frequency offset indication information is used for controlling a frequency offset generated during modulation of a carrier signal, and the frequency offset is an offset relative to a central frequency of the carrier signal; and receiving, by the first device, data transmitted by the second device, where the data is transmitted through a backscatter signal sent by the second device to the first device, and the backscatter signal is a signal obtained after the second device modulates the carrier signal based on the frequency offset indication information.

Systems, methods, apparatuses, and computer program products for mode switching schemes for reconfigurable intelligent surface (RIS) assisted backscatter communications. The method may include connecting with a network node for communication, receiving, from the network node, an indication of activation of backscattering, receiving a backscatter signal together with a signal sent by the network node, and demodulating the backscatter signal and the signal sent by the network node, the backscatter signal including backscatter data.

The invention discloses a positioning method and system combining mobile relay and backscatter communication, and the method comprises the steps: enabling a mobile relay bidirectional wireless charging source in a mobile high-power radio frequency network to be located on the same straight line with two passive sensor nodes in the high-power radio frequency network, solving a receiving signal of the mobile relay bidirectional wireless charging source; according to the positions of the two passive sensors and the mobile relay two-way wireless charging source, the coordinates of the high-power radio frequency charging source are solved through dimensionality reduction and serve as a positioning point, and the coordinates of a to-be-positioned target are solved based on the positioning point; interference elimination is carried out on a received signal of a mobile relay bidirectional wireless charging source in backscatter communication under the high-power radio frequency network; and a high-power radio frequency charging source is used as a sensing positioning node. According to the invention, the communication quality of backscattering under a high-power radio frequency network can be improved, the positioning of the power supply can be quickly realized, and the sensor coverage range of the mobile relay two-way wireless charging power supply is expanded.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, a network device can transmit, to a group of passive devices, a continuous wave (CW) signal. The network device can receive, from each passive device of the group of passive devices, at least one backscatter signal, based on the CW signal, at a respective frequency shift. The network device can estimate, based on the at least one backscatter signal, channel information for each passive device of the group of passive devices. The network device can then determine, based on the channel information, a channel for transmitting an energy signal to at least one passive device of the group of passive devices for energy harvesting.

Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment. The techniques include receiving, from a backscatter device, first backscatter data during one or more network entity downlink slots; receiving, from the backscatter device, during a network entity uplink slot immediately following the one or more network entity downlink slots, second backscatter data; and combining, at the user equipment, the first backscatter data and the second backscatter data to generate a backscatter data package.

The present disclosure discloses a geometry-based stochastic channel modeling method oriented to a wireless communication in an underground mine. The geometry-based stochastic channel modeling method generates basic parameters such as an environment and antennas; generates a three-dimensional time-varying twin-cluster channel environment, that is, a number, a distance and an angle distribution of the clusters, and the like; derives channel parameters such as a position distribution of scatterers, and a power distribution of the scatterers in the clusters; introduces a roughness of a wall and characterizes an influence caused by the rough wall from two aspects of a phase variation and an energy attenuation according to angle parameters, calculates a time-varying channel impulse response and a channel matrix, and implements a simulation channel model and analyzes a statistical characteristic of a channel. The present disclosure adopts a geometry-based stochastic channel modeling method to establish an underground mine channel model, which considers a unique channel characteristic of the rough wall and has a relatively high accuracy, a moderate complexity, and a better universality, and the statistical characteristic of the simulation has a reference value for the design for the communication system in the underground mine.

The invention relates to a signal sending method, a communication device, a communication system and a storage medium. The signal sending method comprises: a first device receives first information and determines whether to send a first signal according to the first information, the first signal being used for charging and / or bearing information and / or backscattering. In this way, the signal transmission for charging and / or information carrying and / or backscattering can be flexibly controlled.

This application provides a wireless communication method and a wireless communications apparatus, to resolve a problem of obtaining, in that Wi-Fi system, a signal used for backscatter communication. The method includes: receiving, by a first device, a first PPDU frame from a second device, where at least a part of the first PPDU frame corresponds to a first signal, and the first signal is a signal used for backscatter communication.

The invention relates to a short-wave communication frequency selection method and device based on ionosphere slant return detection, and the method comprises the steps: carrying out the slant return detection through employing an ionosphere detection system, obtaining a slant return ionogram, separating a vertical measurement echo and a slant return wave from the ionogram through a mode recognition method, and carrying out the frequency selection of the vertical measurement echo and the slant return wave. The method comprises the following steps: reading local ionosphere parameter information from vertical measurement echoes, tracing a front edge of an oblique return wave, then carrying out ionogram inversion, carrying out data fusion on the local ionosphere parameter information and an inversion result, reconstructing a reflection region ionosphere model, constructing a two-dimensional electron concentration profile, and calculating a corresponding passable frequency range by using a ray tracing method. And finally, selecting an optimal communication frequency point according to signal-to-noise ratio information reflected by the ionogram. Therefore, the problems that an existing short-wave communication frequency selection method does not consider ionosphere factors having important influences on short-wave transmission and frequency selection coordination between users, the frequency selection accuracy and reliability are poor, and the stability is insufficient are solved.

A novel scatterer density-based predictive channel modeling method includes: obtaining channel data with different scenarios scatterer densities through a channel measurement or a simulation; obtaining corresponding channel statistical characteristic parameters through a data preprocessing based on the channel data; constructing a graph dataset by taking scatterer density in different scenarios as main characteristics to enhance a space-time correlation of data; dividing the graph dataset according to a certain proportion, and then using a graph attention network and a gated recurrent unit network to extract correlated channel space-time characteristics and implementing a cross scenario channel prediction. The method can capture channel variations in different scenarios, and obtain channel characteristics under different scatterer densities through high space-time correlated channel characteristics, and has good performance in channel prediction based on scenario.

Disclosed are systems and techniques for wireless communications. For example, a first network device can transmit, to second network device(s), a first information signal including information indicating a frequency for a backscattered signal. The first network device can transmit, to a third network device, a second information signal including information indicating a frequency shift for shifting a reference signal to produce the backscattered signal. The first network device can transmit the reference signal to the third network device. The first network device can select, based on channel reports received from the second network device(s), the energy harvesting waveform and at least one second network device for providing the energy harvesting waveform to the third network device. The first network device can transmit, to the at least one second network device, a scheduling signal including scheduling instructions to transmit the energy harvesting waveform to the third network device.

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.

The invention provides a method and device for data signal transmission in network equipment, and the method comprises the steps: generating a data signal, the data signal comprises a delimiter and data, the delimiter comprises at least one first level pair, each first level pair comprises a low level and a high level, and each first level pair comprises at least one second level; the delimiter is used for identifying the starting position of the data, and the delimiter starts at a high level and ends at a low level; or, the delimiter starts at a low level and ends at a high level; and sending the data signal. According to the data signal transmission method provided by the embodiment of the invention, the accuracy of envelope detection output waveform timing can be improved, and the precision of the equipment for calibrating the own clock is further improved.

Systems and techniques are provided for wireless communications. A process can include receiving first configuration information associated with transmission of carrier wave (CW) signals to an ambient Internet of Things (AIoT) device, wherein the first configuration information is indicative of a plurality of candidate frequencies. The process can include determining, based on second configuration information, that the network entity is a valid source for a current CW transmission occasion. The process can include transmitting, to the AIoT device, a first CW signal using a selected frequency of the plurality of candidate frequencies, wherein a transmission power for the first CW signal is based on the second configuration information.

The invention belongs to the technical field of maritime wireless communication. The invention provides an evaporation waveguide and scatter communication mode discrimination method based on measured data. According to the embodiment of the invention, the method comprises the steps: setting a threshold value of a difference between a troposphere scattering path loss simulation value of a troposphere propagation prediction model and an actual measurement path loss average value according to the parameters, such as a communication distance, a working frequency, a transmitting antenna gain and a receiving antenna gain; and according to an evaporation waveguide and troposphere scatter communication mode discrimination criterion, a current offshore beyond visual range communication mode is accurately discriminated. According to the method, the maritime beyond-visual-range communication system can fully utilize the evaporation waveguide to reduce the power consumption of the communication system or improve the communication rate, and key technical support can be provided for performance improvement of the maritime beyond-visual-range communication system.

The invention discloses a non-orthogonal multiple access backscatter communication method, which belongs to the field of communication technology. The non-orthogonal multiple access backscatter communication method comprises: transmitting an electromagnetic wave signal generated by a transmitter to a backscatter tag; the backscatter tag adjusts and spreads the electromagnetic wave signal to obtain a NOMA backscatter signal; the NOMA backscatter signal amplifies the signal through a tunnel diode circuit; the amplified signal is reflected by the backscatter tag and reaches a receiver; the non-orthogonal multiple access backscatter communication method, based on a demodulation scheme of a tunnel diode, increases the power difference between multiple users, thereby improving the demodulation performance, and secondly, through an improved minimum mean square error continuous interference cancellation (MMSE-SIC) algorithm, a special frame design is used to solve the carrier frequency offset (CFO) problem caused by the use of a low-precision oscillator.

The invention relates to the technical field of wireless communication, and discloses a millimeter wave backscatter communication positioning and identification system for multiple tags, which comprises a Chirp signal sending module used for generating and transmitting continuous Chirp signals and receiving signals reflected by customized backscatter tags; and the received signal processing module is used for carrying out demodulation and frequency analysis on the received radar echo signal, determining the distance of the target backscattering tag by measuring the frequency offset of the intermediate frequency signal, and determining the azimuth of the tag through the antenna array of the receiving module. The identity label of the backscattering label is extracted by analyzing the signal intensity; the customized backscattering label is used for adjusting the intensity of the signal reflected back to the radar by changing the reflection state of the backscattering label so as to transmit the identity label of the backscattering label; and the DSSS coding module is used for coding the identity label of the backscattering label so as to increase the signal bandwidth and reduce the signal interference between the labels. According to the method, the customized backscattering tag is matched with the FMCW radar, so that positioning and identification of multiple tags are realized, and the method has a wide application prospect.

The invention provides a STAR-RIS auxiliary transmission passive Internet of Things performance enhancement method, and aims to solve the problems of half-space limitation and low energy and information transmission efficiency of an RIS auxiliary passive Internet of Things. According to the invention, the STAR-RIS is deployed between the passive BDs and the access point to assist the BDs to transmit information to the access point, so that the total space distribution of the BDs is realized. In addition, beamforming is constructed at an energy station configured with multiple antennas to improve energy transmission efficiency. The invention provides an iterative algorithm based on a double-layer frame, and aims to solve the problem of joint optimization of a beam forming vector based on NOMA and an STAR-RIS element coefficient, and maximize the system sum rate, thereby remarkably improving the performance of a passive Internet of Things system.

The apparatus may be a network node configured to transmit, to a backscatter-capable device, a first indication of a first frequency range associated with a downlink (DL) transmission, a second indication of a second frequency range associated with an uplink (UL) communication from the backscatter-capable device, and a third indication of a third frequency range associated with an UL trigger from the backscatter-capable device. The apparatus may further be configured to receive, via the third frequency range, the UL trigger indicating that the backscatter-capable device has information to transmit. The apparatus may also be configured to transmit, based on receiving the UL trigger and via the first frequency range, a CW DL transmission for backscattering from the backscatter-capable device and receive, via the second frequency range, the information from the backscatter-capable device via the CW DL transmission backscattered by the backscatter-capable device.

Method, apparatus, and device for communicating with an extended range. The apparatus is a network apparatus communicating with an ambient internet of things device having an energy storage and capability to transmitting data by backscattering a radio transmission. The apparatus detects that the device has failed to transfer data by backscattering and responsively sends to the device a first radio transmission having instructions to decrease a radio reflection coefficient to increase wireless energy harvesting. The device decreases the radio reflection coefficient accordingly. The device detects sufficient wireless charging of its energy storage with the decreased radio reflection coefficient and increases the radio reflection coefficient accordingly.

An ambient backscatter communication method and system using multiple tags and an intelligent reflecting surface (IRS) are disclosed. The ambient backscatter communication method may comprise the steps of: controlling phase values of reflective elements of a first IRS located between an RF source and tags and phase values of reflective elements of a second IRS located between the tags and a reader in an ambient backscatter communication system; driving the first IRS and the second IRS in which the respective phase values of the reflective elements have been controlled; identifying the performance of each of the tags by means of the driven first IRS and second IRS; selecting a tag with the highest performance from among the tags; receiving a signal including tag information through the selected tag; and estimating the tag information by using the threshold value of the selected tag in the received signal.

Certain aspects of the present disclosure provide techniques for radio frequency identification (RFID) tag singulation. Certain aspects provide a method for wireless communication by a first receiver, such as a passive RFID tag. The method generally includes receiving, from a transmitter, a first signal initiating a first inventory round and in response to receiving the first signal, backscattering a second signal to the transmitter, wherein the second signal is backscattered using resources specific to the first receiver.

Various aspects of the present disclosure relate to intermediate node determination. In an aspect, a first device (for example, a BS) receives, from a set of one or more second devices (for example, one or more of a relay, an IAB node, a UE, or a repeater), proximity information associated with one or more third devices (for example, an ambient internet of things (A-IoT) device). The proximity information is indicative of whether the one or more third devices are proximate to the set of one or more second devices. The first device, determines, based at least in part on the proximity information, a subset of one or more second devices as one or more intermediate nodes between the first device and the one or more third devices. Moreover, the first device communicates with the one or more third devices via at least one second device of the subset of one or more second devices. In this way, it is possible to improve communication performance in the backscatter communication system efficiently, especially in terms of overhead saving.

The invention provides a hidden backscatter communication method based on multicarrier randomized continuous waves. The method comprises the following steps: acquiring multicarrier randomized continuous wave signal characteristic parameters, backscatter signal characteristic parameters and channel parameters between a transceiver and a listener and between the transceiver and each user; according to the characteristic parameters of the multicarrier randomized continuous wave signal and channel parameters between the transceiver and the listener and between the transceiver and each user, determining relative entropy between probability density functions of the listener receiving signal when the user generates a backscattering signal and when the user does not generate the backscattering signal; determining the total reachable rate between the transceiver and all users according to the multicarrier randomized continuous wave signal characteristic parameters, the backscattering signal characteristic parameters and the channel parameters; and maximizing the total reachable rate through a target optimization algorithm by taking the condition that the relative entropy meets the concealment condition as the constraint, and obtaining the optimized statistical characteristic parameters of the multicarrier randomized continuous waves. According to the invention, hidden backscatter communication can be realized.

The invention provides a common-antenna zero-power-consumption Internet of Things terminal energy management system based on radio frequency energy taking, which comprises a radio frequency antenna, a radio frequency energy taking module, a rectification energy storage module, a low-frequency wake-up module, a backscatter communication module and an MCU control unit, in the MCU control unit, a single-chip microcomputer controls the on-off of a power supply of a sensor through a sensor power supply control pin; a power supply of the sensor and a radio frequency switch of the backscatter communication module are switched on only in a wake-up state, and only power supply to a wake-up pin is reserved in the single chip microcomputer; through a three-layer architecture of energy capture, energy control and energy application, the terminal equipment is completely separated from battery dependence. The system constructs a closed-loop energy management system for energy collection, storage, scheduling and dormancy, the scheme is suitable for the field of passive Internet of Things with strict requirements on power consumption, cost and deployment flexibility, and a feasible solution is provided for an Internet of Things terminal.

The invention belongs to the technical field of metamaterial sensors, and particularly relates to a metamaterial multi-parameter sensor for a complex environment, which comprises a dielectric substrate, a temperature sensor, a pressure sensor and a strain sensor, and is characterized in that the dielectric substrate is made of high-temperature co-fired alumina ceramic; the temperature sensor is arranged at the left end of the dielectric substrate; the pressure sensor is arranged in the middle of the medium substrate; and the strain sensor is arranged at the right end of the dielectric substrate and comprises a metal sheet structure capable of generating relative displacement. According to the invention, long-distance signal monitoring is realized by adopting a microwave scattering technology, and the problem that a traditional wired sensing transmission line is damaged at a high temperature is solved; the high-temperature-resistant aluminum oxide HTCC ceramic is used as the dielectric substrate, temperature measurement within the range of 25 DEG C to 1200 DEG C, pressure within the range of 0 kPa to 700 kPa and strain measurement within the range of-400 mu epsilon to + 400 mu epsilon are achieved, the sensor is smaller in size and higher in sensitivity, and application of a traditional sensor in the multi-metal environment is expanded.