484results about "Scatter propogation systems" patented technology

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 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 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 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.

Techniques for selecting frequencies of operation are described. HF signals may land at the receiver node with power levels dependent upon the transmit frequency. The frequency with the highest power level at the receiver node may be selected when the receiver node is not subject to interfering. The receiver node may be unable to receive a desired signal if an interfering signal has a signal level which is higher than the desired signal. The transmitter node may select a frequency which has a receiver signal level which is higher than the interfering signal for the selected frequency. The receiver node may then receive the transmit signal at the selected frequency even when subject to interfering from the interferer node.

The invention discloses a low-slow small target detection and data fusion method based on 5G signals, and relates to a low-slow small target detection and data fusion method. The invention aims to solve the problems of low detection precision and difficulty in effective identification and tracking of the low-slow small target in the prior art. According to the invention, a 5G signal retroreflection detection system with separated transmitting end and receiving end is constructed, direct wave and multipath interference are eliminated by using 5G signal code division multiple access characteristics, and target position and speed information are obtained through two-dimensional matched filtering and two-dimensional sliding correlation processing; a 5G base station forward scattering detection system is established, and target detection is realized by analyzing target forward scattering signal characteristic parameters according to the Babinet principle; a specific data fusion algorithm is adopted to carry out fusion processing on heterogeneous data obtained by backward reflection and forward scattering, and accurate information such as target position, speed, attribute and the like is output. The invention belongs to the technical field of low-slow small target detection.

The invention discloses a sensing equipment selection method and device and related equipment, and belongs to the technical field of communication, and the method comprises the steps that first equipment obtains at least one measurement value of a first target index, the at least one measurement value comprises a measurement value obtained by performing first measurement by at least one first node based on a first signal sent by at least one second device; the first device determines a second device of a target type for performing a perceptual operation based on at least one measurement of the first target indicator.

Provided are a transmission method for ambient backscatter, a communication apparatus, and a storage medium. The transmission method comprises: an ambient backscatter function module in a core network transmits information related to an ambient backscatter service.

Systems, methods and apparatuses herein provides ways to handle interference to a backscattered signal carrying information from an ambient internet of things (IoT) device. The interference may be from the carrier wave that is used for providing energy to the device. In some embodiments, sequence-based interference handling may be used to minimize the carrier wave interference. In some embodiments delay-based Interference handling may be used to minimize the carrier wave interference.

The invention discloses a synchronous perception and backscatter communication method and device based on spatial modulation and backscatter, and relates to the technical field of communication, and the method comprises the steps: transmitting a pilot signal to a label through a transmitting array, modulating the load impedance of the label, and then backscattering the signal to a receiving array; the receiving voltage generated by the receiving array and the original channel matrix are adopted to determine the reflectivity of the clutter tag and the reflectivity of the tag antenna; positioning and identifying the tag based on the reflectivity of the clutter tag; extracting a target channel matrix for constructing a tag from the original channel matrix according to the tag antenna reflectivity; performing spatial modulation on the information bits through a transmitting array, generating constellation symbols and determining an activation label; and backscattering the constellation symbols to the receiving array through the activation tag by adopting the transmitting array, and demodulating and decoding by combining the target channel matrix to output information bits. The backscatter label is accurately positioned and identified in a disordered environment, and spatial modulation is integrated into backscatter communication, so that the reliability of backscatter communication is improved.

Systems and techniques are described for wireless communications. For example, a network device can receive, via receive antennas, signals transmitted from one or more devices. Each receive antenna is within one group of two or more groups. The network device can adjust, using gain control modules, a power level of each signal to produce power adjusted signals. The gain control modules are within one group of the two or more groups. At least a portion of the gain control modules is associated with different gain states. The gain states are based on at least one of distances of the one or more devices from the network device or power levels of the signals transmitted from the one or more devices. The network device can process the power adjusted signals.

The invention discloses a multipath time delay calculation method for an evaporation waveguide and scattering mixed channel under different distances, and the method comprises the steps: determining the length of a propagation path in an evaporation waveguide channel according to the radius of the earth and a central angle corresponding to the arc length of the propagation path in the evaporation waveguide channel; determining the propagation path length in the troposphere scattering channel according to the positions of the scatterer, the transmitting antenna and the receiving antenna; according to the propagation path length in the evaporation waveguide channel, the propagation path length in the troposphere scattering channel, the propagation speed of the electric wave and the channel time delay of the troposphere scattering channel, determining the multipath time delay of the evaporation waveguide and troposphere scattering mixed channel under different communication distances; and setting a code element interval of radio wave communication according to the multipath time delay, so that the radio wave communication adapts to switching of communication modes. According to the method, the multipath time delay of the evaporation waveguide and troposphere scattering mixed channel can be quickly calculated; code element intervals of radio wave communication are set according to multipath time delay, inter-symbol interference is avoided, and the bit error rate is reduced.

The application discloses a wireless signal transmission method, comprising the following steps: transmitting an incident signal within a set resource time length; a first transmission time delay exists in the process of the incident signal reaching a receiving end; a reverse signal is a scattered signal in response to the incident signal, and a second transmission time delay exists in the process of the reverse signal reaching a target end; the time length of the incident signal and / or the reverse signal is set so that the reverse signal reaching the target end is within the set resource time length. The application also comprises a device applying the method. The application solves the timing problem of a reverse scattering communication device transmitting a signal in a mobile communication network, so as to meet the index requirements of the system in terms of inter-code interference and inter-channel interference, and is especially suitable for a system of reverse scattering communication.

The invention discloses a chirp interval modulation backscatter communication method and a chirp interval modulation backscatter communication system based on variable-length scrambling codes, which mainly solve the problems of high power consumption of backscatter labels and high system deployment cost in the prior art. According to the scheme, a sending end sends an environment LoRa signal; the backscattering label modulates information to be sent to an environment LoRa signal in a time interval modulation mode, and modulates a variable-length scrambling code to an anchor symbol; a receiving end performs frequency shift compensation on the backscattering signal by adopting a frequency shift compensation method, demodulates the backscattering signal by combining a sliding window with a variable-length scrambling code, intercepts a backscattering signal sample through the sliding window, and performs de-spreading and fast Fourier transform (FFT) on the signal in the window; the position of an anchor symbol is determined by detecting the maximum value of an FFT peak value, information sent by the backscattering label is recovered from the position of the anchor symbol, and data demodulation is completed. On the premise of keeping demodulation reliability, the power consumption of the tag is effectively reduced, the deployment cost of a backscatter communication system is reduced, and the method can be used for ultra-low power consumption Internet of Things communication.

The invention discloses an unmanned aerial vehicle-to-vehicle multipath channel modeling method considering unmanned aerial vehicle body shielding and six-dimensional motion characteristics, and the method comprises the steps: carrying out the modeling of a channel between a transmitting antenna and a receiving antenna, and obtaining a channel model; calculating position vectors and velocity vectors of the unmanned aerial vehicle, the vehicle, the transmitting-receiving end antenna and the scatterer in the channel model; calculating macro Doppler frequency shift of each signal transmission path in a three-dimensional translation scene of the unmanned aerial vehicle in the channel model; calculating the micro-Doppler frequency shift of each signal transmission path in the unmanned aerial vehicle three-dimensional rotation scene in the channel model; calculating a space-time correlation function of a transmission signal in a six-dimensional motion scene of the unmanned aerial vehicle in the channel model; and calculating the time-varying Doppler power spectrum density of the transmission signal in the six-dimensional motion scene of the unmanned aerial vehicle in the channel model. According to the method, the influence of the six-dimensional motion of the unmanned aerial vehicle on the multipath channel Doppler effect and the channel statistical characteristics is comprehensively analyzed, and comprehensive analysis of the unmanned aerial vehicle on the multipath channel characteristics of the vehicle can be provided.

The invention discloses a sensing processing method and device based on backscattering equipment and related equipment, and belongs to the technical field of communication, and the sensing processing method based on the backscattering equipment comprises the steps that target equipment obtains target information; the target device determines a target configuration parameter based on target information, wherein the target configuration information comprises first configuration information for communication based on the backscattering device and second configuration information for sensing based on the backscattering device; wherein the target information comprises at least one of first information, second information, third information and fourth information, the first information is related information of the backscattering equipment, the second information is related information of a sensing node, the third information is measurement related information, and the fourth information is measurement related information. The fourth information comprises at least one of quality of service and perceptual priori information.

The invention discloses a channel estimation method and system for a flow-state antenna-assisted symbiotic communication system, and the method comprises the steps: arranging a base station, a user and a backscattering device for the flow-state antenna-assisted symbiotic communication system, and installing a flow-state antenna on the base station to assist transmission; the uplink pilot frequency transmission is divided into two stages, and in the two stages, the user and the backscattering device send pilot frequency signals to the base station; carrying out matrix processing on the direct link channel and the backscattering link channel, and converting the direct link channel and the backscattering link channel into Vandermonde matrixes; a channel is obtained based on the converted Vandermonde matrix, and channel estimation is performed on a direct link and a backscattering link by using a least square regression method; according to the invention, channel estimation can be carried out more accurately, the signal processing complexity is lower, and the requirement on system hardware is reduced.

The invention relates to a communication link aggregation method and device of an emergency dispatching vehicle, and belongs to the technical field of emergency communication, and the communication link aggregation method of the emergency dispatching vehicle comprises the following steps: obtaining real-time multi-modal data of the emergency dispatching vehicle, the real-time multi-modal data comprising network parameters, environment data and task metadata; the real-time multi-modal data is used as input of a communication link aggregation model, a communication link aggregation result is determined based on output of the communication link aggregation model, and the communication link aggregation result comprises a selection result of a main link, a bandwidth proportion of each communication link and a priority ranking result of standby links; wherein the communication link aggregation model is constructed on the basis of a Transform architecture, importance weights are allocated to the input parameters on the basis of a self-attention mechanism, and the self-attention mechanism is determined according to the influence degree between the multi-modal data. According to the invention, the high-reliability communication requirement of the emergency dispatching vehicle in an emergency scene is effectively ensured.

The present application relates to the technical field of communications, and discloses a positioning method and a communication apparatus. The method comprises: a network device determining first information corresponding to a first anchor point; the network device sending the first information to a first terminal; and the first terminal obtaining positioning information on the basis of the first information. The first information comprises one or more of the following: first position information, first time delay information, or first angle information. The first anchor point is one of the following anchor points: a first access network device, a mirror of the first access network device, an antenna of the first access network device, a mirror of the antenna of the first access network device, a remote radio head of the first access network device, a mirror of the remote radio head of the first access network device, and a wireless signal scatterer in a wireless signal propagation process of the first access network device or a mirror thereof. On the basis of the described method, the accuracy of terminal positioning can be improved.

Disclosed are a positioning method and a communication device, the method relating to the technical field of communications, the method comprising: a network device determining first information corresponding to a first anchor point; the network equipment sends first information to the first terminal; and the first terminal obtains positioning information based on the first information. Wherein the first information comprises one or more of the following information: first position information, first time delay information or first angle information. The first anchor point is one of the following anchor points: first access network equipment, a mirror image of the first access network equipment, an antenna of the first access network equipment, a mirror image of the antenna of the first access network equipment, a remote radio head of the first access network equipment and a mirror image of the remote radio head of the first access network equipment; the wireless signal scatterer or the mirror image of the wireless signal scatterer in the wireless signal propagation process of the first access network equipment. Based on the method, the terminal positioning precision can be improved.

Optimized backscatter energy harvesting using a Reconfigurable Intelligent Surface (RIS) may be provided. Energy parameters may be received from a backscatter communication device. Then an energy critical message may be received from the backscatter communication device. The backscatter communication device may then be instructed to send frequent messages in response to receiving the energy critical message from the backscatter communication device. Next, a configuration for a Reconfigurable Intelligent Surface (RIS) cluster may be determined to supply energy to the backscatter communication device based on the energy parameters and the frequent messages. The RIS may be caused to supply energy to the backscatter communication device based on the configuration.

To provide a method for optimizing STAR-RIS assisted in-vehicle wireless secure communication beamforming.SOLUTION: First, constructing a STAR-RIS assisted multi-in-vehicle user MISO downlink communication system model is considered in a scenario where eavesdropping users exist. Next, for an energy splitting mode of the STAR-RIS, an optimization problem for minimizing the power of a multi-antenna base station in the system is established by simultaneously optimizing the base station's transmission beamforming and STAR-RIS's transmission and reflection coefficient matrices. Finally, the original problem is solved by separating it into two sub-problems using an alternating optimization method. The present invention utilizes STAR-RIS to support physical layer security, improves the communication quality of in-vehicle wireless systems, and can achieve spatial coverage of the entire area and at the same time effectively reduce the total transmission power of the base station.SELECTED DRAWING: Figure 1

The invention discloses a chirp delay modulation backscatter communication method and a chirp delay modulation backscatter communication system combined with pseudorandom sequence detection, and mainly solves the problems of low data transmission rate, poor demodulation reliability in a low signal-to-noise ratio environment and high backscatter label complexity in the prior art. According to the scheme, a sending end periodically sends an upper sweep frequency signal as an excitation signal; the backscattering label determines delay time according to a to-be-sent data value, completes one-time modulation in two continuous excitation signal periods, and modulates a pseudo-random sequence into a backscattering signal; and a receiving end demodulates the backscattering signal by adopting a sliding window in combination with a pseudo-random sequence, intercepts the backscattering signal through the sliding window, and performs de-spreading processing and fast Fourier transform on the signal in each window to determine a symbol position so as to realize data demodulation. According to the method, multiple pieces of bit information can be transmitted in one symbol period, the data transmission rate and demodulation reliability are improved, the complexity of the backscattering tag is reduced, and the method can be used for low-power-consumption data transmission of the Internet of Things equipment.

The invention provides a communication method. The communication method comprises the following steps: receiving at least one reference signal sent by a second device; and reporting information of the target reference signal and / or beam information associated with the target reference signal to a third device, the at least one reference signal comprising the target reference signal, and the target reference signal being a reference signal satisfying a first condition. The communication method provided by the invention can be suitable for sending and receiving signals in a wireless sensing scene.

The invention relates to an interference suppression method for backscatter ambient internet of things transmission. Systems and methods for interference mitigation for backscatter environment Internet of Things (IoT) transmissions are discussed herein. A base station transmits downlink control information (DCI) to a first user equipment (UE) and a second UE indicating that the first UE and the second UE transmit carriers on different subcarriers during a time slot; receiving, during the time slot, a first composite transmission on a first subcarrier and a second composite transmission on a second subcarrier, the first composite transmission comprising a carrier as transmitted by the first UE and a first backscatter generated from the carrier by a first environmental IoT tag, the second composite transmission includes a carrier as transmitted by the second UE and a second backscatter generated from the carrier by a second environmental IoT tag; and decoding data of the first environment IoT tag and the second environment IoT tag from the first backscatter and the second backscatter.

This application discloses a transmission processing method and apparatus, a terminal, and a network side device, and belongs to the field of communication technologies. The transmission processing method in the embodiments of this application includes: performing, by a terminal, a target operation when there is a conflict between transmission of first information and transmission of second information, where the first information includes at least one of a wake up signal, the second information includes at least one of a physical channel and a signal, and the target operation includes transmitting the second information without transmitting a part of the first information whose transmission conflicts with the transmission of the second information.

The invention discloses an evaporation waveguide and scattering channel multipath time delay calculation method under different elevation angles, and the method comprises the steps: determining the length of a propagation path in an evaporation waveguide channel according to the radius of the earth and a central angle corresponding to the arc length of the propagation path in the evaporation waveguide channel; obtaining the propagation path length of the electric wave in the troposphere scattering channel according to the included angle between the connecting lines of the transmitting antenna and the circle center, the elevation angle of the transmitting antenna and the receiving antenna, the included angle between the connecting lines of the electric wave receiving antenna and the circle center, and the elevation angle of the transmitting antenna and the receiving antenna; then calculating to obtain the multipath time delay of the mixed channel; and setting a code element interval of radio wave communication according to the multipath time delay, so that the radio wave communication adapts to switching of communication modes. According to the calculation expression of the multipath time delay of the mixed channel, which is obtained by the invention, the multipath time delay of the evaporation waveguide and troposphere scattering mixed channel can be quickly calculated; code element intervals of radio wave communication are set according to multipath time delay, inter-symbol interference is avoided, and the bit error rate is reduced.

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.

Systems and methods are provided for selecting an antenna amplitude taper to transmit wireless signals to a coverage area from a base station. A first interference level at a victim cell is determined when using a first amplitude taper. A second interference level at a victim cell is determined when using a second amplitude taper. Based on determining that the second interference level is less than the first interference level, the second amplitude taper is selected to transmit the wireless signals to the coverage area form the set of antenna elements at the base station.