320results 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 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.

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.

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 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.

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

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.

Systems, methods, and software are disclosed herein for localizing an atmospheric duct based on remote interference. In an implementation, a method of operating a computing device for localizing an atmospheric duct includes detecting cross-cell interference during an uplink transmission at a network cell, identifying a source of the cross-cell interference based on a RIM reference signal embedded in the cross-cell interference, and generating localization information of an atmospheric duct based on position information of the network cell relative to the source and a propagation delay of the cross-cell interference.

The present invention discloses a method and device for optimizing the security capacity of a drone-assisted backscatter communication system, which relates to the field of wireless communication technology. The system includes one drone, K backscatter devices and M eavesdroppers, and includes the following steps: obtaining collected energy, inputting the collected energy into the backscatter device for backscatter communication, optimizing time allocation, drone trajectory and backscatter device scheduling based on preset energy constraints and security performance constraints of backscatter communication; solving time allocation, drone trajectory and backscatter device scheduling respectively to obtain three optimal solutions, performing global iteration on the three optimal solutions to obtain a global optimal solution as the security capacity optimization result, thereby maximizing the security capacity of the minimum link.

The application discloses a method and device for optimizing safety and energy efficiency of a backscattering communication system assisted by a UAV, and relates to the technical field of wireless communication, which comprises the following steps: acquiring system parameters and preset constraint conditions, optimizing the UAV transmission power, the UAV trajectory and the backscattering device scheduling based on the system parameters and the preset constraint conditions, and obtaining the UAV transmission power problem, the UAV trajectory problem and the backscattering device scheduling problem to be solved; solving the UAV transmission power problem, the UAV trajectory problem and the backscattering device scheduling problem, and obtaining the corresponding optimal solution of the UAV transmission power, the optimal solution of the UAV trajectory and the optimal solution of the backscattering device scheduling; globally iterating the three optimal solutions to obtain a global optimal solution as the safety and energy efficiency optimization result, so as to maximize the safety and energy efficiency of the system; and the safety and energy efficiency of the system can be effectively improved.

The invention provides an Internet of Things communication method and equipment, the method is applied to excitation source equipment in the Internet of Things, the Internet of Things is provided with at least one excitation source equipment, and the method comprises the following steps: executing a target operation according to configuration information corresponding to the excitation source equipment, the target operation comprises at least one of the following items: sending a radio frequency signal to the Internet of Things equipment, amplifying and forwarding a downlink signal of the target equipment, and sending a carrier signal for uplink backscattering transmission to the Internet of Things equipment; the radio frequency signal is used for providing radio frequency energy for the Internet of Things equipment; the configuration information comprises time-frequency phase related information used by the excitation source equipment for executing the target operation. In the scheme, the at least one excitation source device is controlled by the configuration information to coordinately execute the target operation, so that the same-direction superposition of signals between the at least one excitation source device can be realized to avoid mutual weakening, and the coverage capability of the Internet of Things is improved.

The application discloses a sky-wave massive MIMO beam structure turbo receiving method and a receiver. The application realizes uplink multi-user iterative detection decoding by using a beam structure turbo receiver. The beam structure turbo receiver comprises a beam structure soft input soft output detector, a soft input soft output decoder, an interleaver and a deinterleaver. The beam structure soft input soft output detector comprises a windowing module, a beam transformation module, a beam selection module, a beam domain signal detection module and the like. The extrinsic information of the code bits sent by each user is calculated through a base station receiving signal, and the extrinsic information is fed back to the beam structure soft input soft output detector after deinterleaving, decoding and interleaving, and is used to update the prior information of the sending symbols to perform the next round of iterative detection decoding. The application utilizes the sparse characteristics of the sky-wave massive MIMO beam domain channel and a turbo receiving framework to design the receiver, and can effectively improve the sky-wave massive MIMO uplink receiving performance and reduce the calculation complexity.

The application discloses a kind of based on space modulation and reverse scattering's synchronous sensing and reverse scattering communication method and device, it is related to communication technical field, including: through transmitting array to tag pilot signal and modulate the load impedance of tag again backscatter to receiving array;Using the receiving voltage generated by receiving array and original channel matrix determines clutter tag reflectivity and tag antenna reflectivity;Based on clutter tag reflectivity positioning and identification label;From original channel matrix, according to tag antenna reflectivity, extract and construct the target channel matrix of label;Information bits are spatially modulated by transmitting array, constellation symbol is generated and active label is determined;Using transmitting array, constellation symbol is backscattered to receiving array by active label, and combined with target channel matrix, demodulation and decoding output information bits.In the disorderly environment, reverse scattering label is accurately positioned and identified, and space modulation is integrated into reverse scattering communication, and the reliability of reverse scattering communication is improved.

The present technology relates to a communication control device, a communication control method, and a program that enable appropriate communication of a backscatter signal. The communication control device receives a role request signal requesting execution of a role related to communication of a backscatter signal by a backscatter signal generation device, and determines an operation on the basis of the role request signal. The present technology can be applied to a wireless communication system.

The invention discloses a low-power-consumption magnetic field sensing and transmission integrated method based on a full-simulation framework, and the method comprises the steps: collecting a magnetic flux leakage signal through an orthogonally-deployed dual-channel TMR sensor in a sensing stage, and carrying out the parallel processing of two channels through simulation addition and a differential circuit; an analog voltage signal with the optimal amplitude is obtained through peak detection and analog comparison logic self-adaptive selection, meanwhile, a corresponding binary level is generated according to amplitude high-low mapping, and blind area elimination and coding are completed from a physical layer. In the transmission stage, a non-linear device is utilized to passively extract a difference frequency component from an external double-chirp excitation signal, and a stable clock is obtained through resonant filtering and normalization; and the optimal analog voltage signal output in the sensing stage is directly mixed and modulated with a clock, and a radio frequency switch is driven to realize passive backscattering transmission. And a receiving end completes synchronization based on a known upper chirp sequence, compresses a backscattering signal to a base band through de-chirp and down-conversion, and recovers a binary bit stream at a node side through resampling and self-adaptive threshold judgment.

The invention belongs to the related technical field of wireless communication, and discloses a space-time coding metamaterial design method and system for multi-target sensing communication and electronic equipment, and the method comprises the steps: (1) constructing a mapping relation between an environment physical quantity and a reflection coefficient of a space-time coding metamaterial unit, performing optimization design on the space-time coding metamaterial units based on the obtained mapping relation, arranging the space-time coding metamaterial units obtained through optimization in an array manner to form an antenna array, and further obtaining the space-time coding metamaterial; the space-time coding metamaterial comprises the antenna array, a sensing module and a phase shifting module. (2) according to the obtained mapping relation, performing time coding on a sensing module in the space-time coding metamaterial according to a beam forming matrix; and (3) performing space coding on the phase shift module in the space-time coding metamaterial according to the space-time coding matrix, thereby obtaining the final space-time coding metamaterial. The method can reduce the power consumption of multi-physical-quantity sensing communication, and has important scientific significance.

The present application belongs to the technical field of communications. Disclosed are a signal transmission method and apparatus, an information configuration method and apparatus, and a readable storage medium. 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 and a received carrier signal, wherein the first signal is a backscattered chirp spread spectrum (CSS) modulated signal; and sending the first signal.

The application belongs to the field of low-power Internet of Things, and particularly relates to a resource allocation method for a full-duplex wireless power supply backscattering communication system; the method comprises the following steps: constructing a full-duplex wireless power supply backscattering communication system model; considering throughput constraints, transmission power constraints, energy collection constraints, transmission energy consumption constraints, reflection coefficient constraints and time allocation factor constraints, constructing a total throughput maximization resource allocation model with the optimization target of maximizing the total throughput; converting the throughput maximization resource allocation model into four optimization sub-problems; solving the four optimization sub-problems to obtain a resource allocation scheme; and allocating resources according to the resource allocation scheme; the application considers the minimum throughput requirement of each reflection node, meets the quality of service requirement of the reflection node, and improves the system throughput.

The disclosure relates to an electronic device, a wireless communication method, and a computer readable medium. An electronic device for wireless communication according to one embodiment includes processing circuitry. The processing circuitry is configured to obtain a distance between a transmitting end and a receiving end of backscatter communication, determine one or more ambient radio frequency sources for the backscatter communication based on the distance, and inform or control the ambient radio frequency sources to provide radio frequency signals for the backscatter communication.

The invention relates to the field of wireless communication, in particular to a modeling method and device for a multipath cluster of a static scatterer and electronic equipment, and is used for improving the accuracy of interference cancellation. Spatial characteristic parameters of the static scatterer are obtained, the spatial characteristic parameters comprise a first distance between the center of the static scatterer and the transmitting antenna, a second distance between the transmitting antenna and the receiving antenna and an initial included angle of the static scatterer, and the initial included angle is an included angle between the first distance and the second distance; according to the spatial characteristic parameters, determining a time delay function and a channel gain function of a multipath cluster of the static scatterer; obtaining a channel response function and an average time delay function of the multipath cluster through the time delay function and the channel gain function; and obtaining a channel time delay power spectrum of the multipath cluster according to the channel response function of the multipath cluster, and obtaining root-mean-square time delay extension according to the average time delay function, the time delay function and the channel gain function.

The disclosure discloses a method and apparatus for transmitting information, a method and apparatus for receiving information, a device, and a readable storage medium, and belongs to the technical field of communication. The method for transmitting information according to an embodiment of the disclosure includes: transmitting a first signal by a first device, where the first signal includes a first portion and a second portion; the first portion occupies M first time units, and data in the M first time units are identical; the second portion occupies M second time units, and data in the M second time units are identical; and the data in the first time units are identical or contrary to the data in the second time units, and M is an integer greater than 2.

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.

A radio device (100) for a wireless communication network includes a backscatter transmitter (102) for transmitting a signal (104) using a backscattered signal, and to at least one or more groups of a plurality of different device groups (ID1, ID2,...).

A scattering parameter measurement device based on microwave photonic mixing includes a microwave generation module 1, a signal loading module 2, a local oscillator frequency generation module 3, a multi-channel microwave photonic mixing module 4, an analog-to-digital converter (ADC) module 5, and a signal processing module 6. Along the signal output direction of the multi-channel microwave photonic mixing module 4, the ADC module 5 and the signal processing module 6 are sequentially arranged. This invention utilizes microwave photonic mixing technology and a local oscillator source with relatively small bandwidth to down-convert a high-frequency microwave signal to a fixed-frequency intermediate frequency (IF) signal. This reduces the bandwidth requirements of the receiver's electronic components and the sampling rate requirements of the ADC. It abandons the traditional superheterodyne structure and / or direct conversion structure, using a miniaturized continuous optical module as the light source for microwave photonic mixing, simplifying the system structure and reducing cost and power consumption.

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.

Configuring and utilizing a body area network (BAN) is provided. In a configuration phase, configuration messages are sent for scheduling a plurality of backscatter devices such that during a data collection phase each of the plurality of backscatter devices is configured to transmit in an individually-assigned time slot. In the data collection phase, a data collector device receives, from the plurality of backscatter devices, sensor data messages including sensor data from the backscatter devices, the sensor data messages being scheduled according to the configuration phase.