172results about "Scatter propogation systems" patented technology

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 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.

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 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 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 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 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.

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.

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.

The invention discloses a holographic MIMO near-field channel estimation method based on a spatial correlation matrix, and the method comprises the steps: carrying out the modeling of a 3D H-MIMO channel based on a non-uniform spherical wave model, and building an H-MIMO near-field channel model; calculating a spatial correlation coefficient between antenna units at a base station end, introducing a generalized single-ball scatterer model, and deducing to obtain a near-field spatial correlation matrix; eigenvalue decomposition is carried out, and a low-dimensional signal subspace is constructed; designing a pilot frequency matrix, wherein the pilot frequency time slot number in the pilot frequency matrix is set as the rank of the low-dimensional signal subspace; and estimating the low-dimensional signal subspace coefficient to obtain a channel estimator of the low-dimensional signal subspace. According to the channel estimation method, spatial correlation prior information is effectively utilized, and the pilot frequency overhead and the calculation complexity are remarkably reduced.

A wireless communication system includes: a transmitter configured to transmit a carrier wave that is unmodulated; a plurality of passive terminals; and a receiver. Each of the plurality of passive terminals is configured to receive the carrier wave, superimpose a subcarrier of which frequency is determined in advance for each of the plurality of passive terminals on a backscatter of the carrier wave, modulate a signal generated by a signal source onto the subcarrier using a predetermined modulation scheme, and transmit the backscatter. The receiver is configured to receive multiple backscatters transmitted from the plurality of passive terminals, perform frequency conversion and orthogonal transformation on the multiple backscatters to generate a finite-length data series having an I component and a Q component, remove an interference component from the finite-length data series, and perform demodulation to acquire the signal of the signal source in each of the plurality of passive terminals.

The invention discloses a signal sending method and device. According to the method, information of a preset single-time sending duration and information of a preset sending time interval are obtained in response to a signal sending request, and the single-time sending duration and the sending time interval are both in positive correlation with a first distance between a sending device and a target object; according to the information of the single sending duration and the information of the sending time interval, determining the information of a single sending time period and the information of a sequence number corresponding to each single sending time period; in a preset corresponding relation between a sequence number and a sub-waveform signal, obtaining a target sub-waveform signal corresponding to the target sequence number, the target sequence number being a sequence number corresponding to the target single sending time period; and sending the target sub-waveform signal in the target single sending time period. According to the embodiment of the invention, the method can solve a self-interference problem when a wide pulse radar signal is used for measurement in a small darkroom environment, and guarantees the accuracy of a measurement result.

The invention provides an optimal label selection scheme of a backscattering NOMA communication system in a multi-label environment. The system is composed of a base station BS, two users (UN and UF) and M backscattering labels Ti (i = 1, 2, 3,..., M). The multi-label environment backscattering technology is applied in the NOMA communication system, M labels are placed between the base station BS and the remote user UF, and the label with the optimal performance is selected for transmission by using the selection and combination technology, so that compared with single-label backscattering, the outage probability of the remote user is reduced, the system throughput is improved, and the communication efficiency is improved. And the transmission efficiency of the system is further improved.

The application relates to the field of backscatter technology and discloses a single-receiver WiFi backscatter communication method and system, which comprises the following steps: a tag receives OFDM symbols from ambient WiFi signals, a linear phase factor corresponding to a tag-related cyclic shift value is applied to only the middle part of a data load, and the OFDM symbols of a reflection signal are reconstructed based on the middle part of the modulated data load; a receiver extracts the modulated part from the received OFDM symbols of the reflection signal, performs frequency domain inverse shift compensation on each candidate cyclic shift value, obtains a reconstructed data load based on the obtained compensated spectrum, calculates the correlation score between the power spectrum of the reconstructed data load each time and a binary template predefined based on the position of the empty subcarrier, decodes the cyclic shift value, and recovers the corresponding tag data. The application can realize a high data throughput without sacrificing OFDM compatibility.

Systems and techniques for wireless communication are disclosed. For example, a first network device may transmit a first information signal to a second network device, the first information signal including information indicative of a frequency for a backscatter signal. The first network device may transmit a second information signal to a third network device, the second information signal including information indicating a frequency shift for shifting a reference signal to produce a backscatter signal. The first network device may transmit a reference signal to a third network device. The first network device may select an energy harvesting waveform and at least one second network device for providing the energy harvesting waveform to a third network device based on a channel report received from the second network device. The first network device may transmit a scheduling signal to at least one second network device, the scheduling signal including a scheduling instruction for transmitting an energy harvesting waveform to a third network device.

Charging for Ambient Power (AMP) devices and, in particular, AMP Backscatter Devices (BKDs) may be provided. AMP device charging may include a transmitting device transmitting an initial charging frame, the initial charging frame comprising a payload for charging. The transmitting device may detect a BKD in response to transmitting the initial charging frame. The transmitting device may then determine a new payload for a new charging frame to charge the BKD and transmit the new charging frame to charge to the BKD.

The invention discloses an unmanned aerial vehicle auxiliary backscattering data acquisition method, and the method comprises the following steps: creating an unmanned aerial vehicle trajectory model, dividing the flight duration into equal-length time slots, and applying a flight speed upper limit, a height range limit and a multi-machine collision prevention horizontal spacing constraint; the unmanned aerial vehicle supplies energy to the Internet of Things equipment through directional wireless energy transmission, and the Internet of Things equipment alternately executes energy receiving and data returning in a half-duplex mode; dynamically calculating a data acquisition rate based on the unmanned aerial vehicle trajectory model and the channel gain; and an unmanned aerial vehicle consumption model based on aerodynamics is created, and the unmanned aerial vehicle hovers according to a preset sequence to collect update information of the Internet of Things equipment and returns the update information to the data center. According to the method, the minimum data acquisition rate is maximized by jointly optimizing the three-dimensional trajectory and time distribution of the unmanned aerial vehicle, the problem is optimized by adopting a new variable introduction method, and the energy loss of the unmanned aerial vehicle in the flight process is ensured to reach the minimum.

The application belongs to the technical field of wireless communication, and discloses a backscattering communication method, device and system based on multi-carrier differential modulation t The transmission vector at t-1 time is expanded into a symmetric and full-rank subcarrier block transmission matrix, the transmission vector u t is subjected to rectangular differential modulation to obtain the transmission vector at t time, and then is converted into a time-domain data frame and mapped into a reflection coefficient; and the excitation source signal is modulated by means of an impedance network to generate a backscattering signal. Since differential modulation transmits information based on the difference between adjacent symbols, the channel state information is cancelled in the process of data detection at the receiving end, and the original sending data can be recovered by non-coherent detection of the receiving signal at the receiving end, without a complex cascaded channel estimation process, so that the complexity of the multi-carrier backscattering communication system is effectively reduced.

This invention discloses a scattering communication device based on a single-conversion frequency conversion method, belonging to the field of scattering communication technology. It mainly includes a modulation and demodulation unit, a frequency conversion component, a power amplifier, and an RF front-end. It adopts a frequency division duplex mode, with both the transmit and receive channels using a single-conversion frequency conversion method to achieve adaptive transmission of voice, video, images, and other IP data. This invention can be used in scattering communication devices in the C, X, and Ku bands, adapting to different transmission environments and requirements. Compared with traditional scattering communication devices using a double-conversion frequency conversion method, it can improve system integration and flexibility, simplify circuit design, and reduce system costs.

Techniques for continuous wave (CW) signal transmission in device-to-reader (D2R) backscattering for ambient Internet of Things (IoT) applications are described. A reader device generates multiple CW signals at different frequencies and transmits them via separate antennas. The frequencies are positioned symmetrically within a resource block or across system bandwidth. The disclosure incorporates configurable hopping mechanisms, allowing frequency swapping between antennas or switching to additional antennas. The reader can select various CW transmission parameters, including the number of tones, tone locations, number of transmit antennas, and hopping configurations. The disclosure also addresses adaptive preamble transmission for both reader devices and IoT devices.

The invention discloses a sensing method and device. The network equipment receives first information according to a first period, the first information comprises position information of the terminal, the first period is related to a period of a first signal, and the first signal is used for sensing. And the network equipment determines the transmission delay of the received first signal in a first transmission path according to the position information, wherein the first transmission path is a transmission path in which the first signal is reflected, scattered or diffracted by the sensing target. In the embodiment of the invention, the network equipment can determine the transmission time delay of the first signal in the first transmission path according to the position information instead of directly determining the transmission time delay of the first signal in the first transmission path according to the measurement result, equivalently, the influence caused by timing deviation is eliminated when the transmission time delay is determined; the accuracy of the determined transmission time delay is improved, so that the sensing precision is improved.

The invention discloses a sensing method and device. And the UE receives first indication information, the first indication information being used for indicating to suppress a signal on a reflection path corresponding to the first beam, and the reflection path being a transmission path of the signal reflected by the sensing target. And the UE sends the suppressed uplink reference signal on a reflection path corresponding to the first beam according to the first indication information. In the embodiment of the invention, the first indication information can indicate to suppress the signal on the reflection path. According to the invention, the terminal can suppress the signal on the reflection path according to the first indication information, thereby reducing the influence of the signal on the reflection path on the signal on the scattering path, and improving the sensing precision.

Provided are backscatter communication method, apparatus and device, and a storage medium. The backscatter communication method applied to a first communication node includes: (S110) determining a target position situation used to carry first information, and (S120) performing backscatter communication according to the target position situation.