29 results about "Amplify and forward" patented technology

An embodiment is a method performed by a source node to activate relay functionality of a relay node on a per-physical layer protocol data unit (PPDU) basis. The method includes generating a PPDU that includes a first set of preamble fields, followed by a relay-on field indicating that the relay node should relay the PPDU, followed by a second set of preamble fields, followed by a data field that includes a frame intended for a destination node, wherein the first set of preamble fields includes a first legacy short training field (L-STF) field, a first legacy long training field (L-LTF) field, and a first legacy signal (L-SIG) field, wherein the second set of preamble fields includes a second L-STF field, a second L-LTF field, and a second L-SIG field. The method further includes transmitting the PPDU.

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 kind of narrowband internet of things wireless communication optimization digital twin method and system, it is related to wireless communication optimization technical field, method includes the digital twin environment corresponding to target industrial scene is constructed, for simulating wireless signal propagation characteristic;NB-IoT network is deployed in digital twin environment, and channel data is obtained by running wireless communication simulation;According to channel data, the communication performance index of terminal is calculated, and the terminal to be optimized is identified;For the terminal to be optimized, select relay terminal in digital twin environment and determine the gain of amplify and forward, simulate the process of cooperative communication;Re-run simulation to verify optimization effect, if it does not meet the requirement, then adjust parameter and repeat optimization, until the communication performance of all terminals meets the standard.The application migrates the optimization process of traditional dependence on site traversal test to virtual space, without large-scale artificial road test in live area such as transformer substation, shorten optimization period, reduce cost.

The embodiment of the invention provides a communication group key generation method and device, equipment and a computer storage medium. According to the communication group key generation method provided by the embodiment of the invention, when the first user node sends the second training sequence, the second user node sends the interference signal to the relay node so as to actively pollute the observation environment of the relay node, and when the relay node carries out linear estimation on the received first mixed signal, the interference signal is not influenced. The obtained second channel estimation value is a result polluted by noise and interference signals, and the eavesdropping risk of the relay node is effectively reduced. A first mixed signal is amplified and forwarded at a relay node, estimation is carried out at a first user node and the relay node respectively to obtain a third channel estimation value and a second channel estimation value which are highly related, and then key negotiation only needs to be carried out once based on the third channel estimation value and the second channel estimation value subsequently. Therefore, the consistent group key can be generated, and the channel estimation time slot and the key negotiation frequency are obviously reduced.

Repeater and control method are provided for DL transmission and UL transmission between a BS and a UE. In one novel aspect, the repeater establishes a control link with the BS. Then, the repeater configures an amplify and forward link between the BS and the UE by at least one configuration of the control link.

A method for switching a signal processing mode is provided. The method includes: A signal processing mode of a network device includes a first mode and a second mode. Processing, by the network device, a signal in the first mode includes processing a baseband signal of the signal; and processing, by the network device, the signal in the second mode includes amplifying and forwarding a radio frequency signal of the signal but does not include processing the baseband signal of the signal. A plurality of signal processing modes of the network device are configured, to enable the signal processing modes of the network device to better adapt to different communication scenarios, balancing an energy saving gain and service performance of the network device.

A 2-D system probabilistic security filtering method under relay network spoofing attack comprises the four steps of establishing a state space model of a 2-D system, establishing an amplification forwarding relay communication model with spoofing attack, designing a security filter and solving an optimal filter gain matrix. By means of a 2-D mathematical induction method and a stochastic analysis method, the designed filtering method can filter a 2-D system with a given guarantee probability in a complex communication scene of random noise, long-distance transmission and hostile attack. And more schemes are provided for the filtering problem of a complex system in practical engineering while the filtering precision is ensured.

The invention discloses a large-scale MIMO non-orthogonal multiple access bidirectional relay method based on an unmanned aerial vehicle, and belongs to the field of wireless communication, and the method comprises the steps: constructing a hovering rotor unmanned aerial vehicle working in a full duplex mode as an amplification forwarding relay, and constructing a model of M ground user pairs needing bidirectional communication; the ground user pair sends a superposed signal to the unmanned aerial vehicle by adopting a non-orthogonal multiple access protocol; the unmanned aerial vehicle performs pilot frequency training by using a minimum mean square error method to obtain imperfect channel state information, and adopts maximum ratio merging or maximum ratio transmission linear processing as a relay precoder; and the unmanned aerial vehicle broadcasts the processed signals back to all ground user pairs. The large-scale MIMO non-orthogonal multiple access bidirectional relay system based on the unmanned aerial vehicle is reliable in performance, high in communication capacity, strong in coverage capability and good in anti-noise performance.

The application discloses a relay communication method and device, and is used for solving the problem of low accuracy of judging uplink and downlink ratio by envelope detection in the prior art. The method comprises the following steps: a relay device receives first information sent by a host device and relays and forwards based on the first information. The first information is used for determining whether the relay device starts an amplify-forward function on a first time domain resource unit in a first time domain resource set. The first time domain resource set comprises one or more time domain resource units, and the first time domain resource unit is any time domain resource unit in the first time domain resource set. The host device indicates the time domain resource unit in which the relay device starts / closes the amplify-forward function through the first information, so that the relay device can accurately judge the uplink and downlink transmission boundary, thereby reducing the influence of interference noise and improving the communication quality.

According to the wireless group control lamp system and the remote penetration control method thereof, at least one relay node is arranged in a lamp node distribution area, wireless signals can be amplified and forwarded, the signal coverage range is expanded, the signal blind area is reduced, and the remote penetration control of the wireless group control lamp system is realized. When direct communication between the lamp nodes and the remote control terminal is serious in signal attenuation due to distance or obstacles, the relay nodes transmit signals in a relay mode, stability and reliability of the signals are guaranteed, the problem of control instruction transmission is avoided, and the lamp control effect is improved. Besides, a group control calculation end calculates a comprehensive control weight according to the signal attenuation rate, the node energy consumption ratio and the historical control response accuracy rate of the lamp nodes in the current network environment and a preset lamp function importance coefficient, control priorities of the lamp nodes are ranked according to the comprehensive control weight, and the execution sequence of control instructions is scientifically and reasonably arranged; the problem of lack of a reasonable sorting mechanism in the prior art is solved, and the system control efficiency and reliability are improved.

The invention relates to the technical field of wireless communication, in particular to a power distribution method of a large forwarding system under imperfect channel estimation. The method comprises the following steps: firstly, sequentially sending pilot frequency information through a source node and a relay node to carry out channel estimation, and obtaining a channel estimation value by adopting a minimum mean square error estimation criterion; the destination node estimates the signal-to-noise ratio of a received signal and the total energy consumption in the data transmission process, wherein the transmission of data information adopts an amplification forwarding mode; and the destination node realizes joint optimization distribution on the data transmitting power of the source node and the relay node through an iterative algorithm according to the defined system objective function. According to the invention, the utilization efficiency of energy resources is improved in an amplification forwarding relay system with imperfect channel estimation.

The invention provides an intelligent repeater and an operation method thereof, which can intelligently amplify and forward radio frequency signals of corresponding frequency bands according to indication of a base station, configuration of the repeater and signal intensity change, and comprises a connection management and control subsystem used for establishing connection with the base station, obtaining cell information and forwarding configuration information issued by a network manager, the connection management and control subsystem finds a proper cell according to the indication of a base station, the configuration of a repeater and the change of signal intensity, and indicates the amplification and forwarding subsystem to work on a corresponding frequency band; and the amplifying and forwarding subsystem is used for amplifying and forwarding the radio frequency signals of the corresponding frequency bands.

The present invention discloses a cooperative cognitive covert communication method based on a maximum rate mechanism. In the first vT period, a primary transmitter PT transmits information to a secondary transmitter ST; in the remaining (1‑v)T period, a secondary receiver SR selects the first secondary transmitter ST i , Secondary transmitter ST j , then, the first secondary transmitter ST i The main transmitter PT transmits a signal to the secondary transmitter ST and performs covert communication and assist communication respectively; the main transmitter PT transmits a signal to the first secondary transmitter ST i Transmitting information, the first secondary transmitter ST i The primary transmitter PT transmits information to the secondary transmitter ST according to the amplify-and-forward (AF) protocol. j To monitor the transmission, the second secondary transmitter ST j The secondary receiver SR performs covert transmission; the remaining (K-2) secondary transmitters ST remain silent. The present invention utilizes the uncertainty of the wireless channel and the noise at the receiving end to realize the covert communication of the secondary network, and has good concealment performance, which can ensure the covert communication quality of the secondary network.

This invention discloses a UAV-assisted covert communication method and system under multi-monitoring node cooperation, belonging to the field of wireless communication technology. The UAV-assisted covert communication method under multi-monitoring node cooperation includes: establishing a legitimate link transmission model and a detection model for a fusion center to perform binary hypothesis testing on the legitimate transmitter's transmission behavior; deriving the minimum detection error probability of the fusion center; constructing a non-convex optimization problem of the amplification and forwarding coefficients of the monitoring nodes, equivalently transforming it into an optimization problem under unit norm constraints, and simplifying it into a one-dimensional search problem with a single variable, solving for the optimal amplification and forwarding coefficient direction; and optimizing the legitimate transmitter power to maximize the effective covert communication rate based on the monotonicity of detection performance with respect to the legitimate transmitter's transmission power. This invention achieves covert communication with low computational complexity, low resource consumption, and high effective rate, and reveals the saturation effect of the benefits of cooperative detection.

A smart repeater (SMR) can be configured to amplify and forward data from a base station based on received control information for managing power efficiency of on-off operations. The SMR can configure a power control mechanism based on the control information to adapt one or more bandwidths associated with the SMR based on the control information to save power and forward the communications to the base station or the UE. The control information can include a component carrier (CC) index or a bandwidth part (BWP) identifier (ID), and a set of parameters to configure on-off operations of the one or more bandwidths according to one or more CCs or BWPs.

The application discloses a wireless optical communication method based on cooperative non-orthogonal multiple access and multi-user diversity, and mainly solves the problems of few accessible users and low user resource utilization in the prior art. The implementation scheme is as follows: a cooperative non-orthogonal multiple access underwater multi-user diversity wireless optical communication system is constructed; a source node selects far users and near users with the best channel according to a multi-user scheduling algorithm; the source node superimposes far user signals and near user signals in a power domain, and simultaneously sends the superimposed signals to the far users and the near users; the near users demodulate their own signals through serial interference cancellation; the near users send signals to the far users as relays by using a decode-and-forward protocol or an amplify-and-forward protocol; and the far users demodulate their own signals by selecting and combining two signals sent by the source node and the relay node. The application improves the number of user access, the source node can serve multiple user groups at the same time, and the system interruption performance is improved, and the application can be used in a multi-user underwater wireless optical communication system.

The invention provides a covert communication method based on a movable antenna auxiliary relay, in a covert communication scene, confidential information from a transmitter to a receiver is forwarded through a relay node, the relay is provided with Mr movable antennas, and the physical position is allowed to be dynamically adjusted; the transmission model comprises: a first stage: a transmitter sends a signal to a relay node through a beam forming matrix, and the relay node receives, amplifies and forwards the signal through a movable antenna; in the second stage, the relay node forwards the signal to the receiver by transmitting a beam forming vector; the position of the movable antenna, a transmitter beam forming matrix and a relay transmitting beam forming vector are jointly optimized to meet the following constraints: the joint detection error probability of a listener on two-stage signals is constrained by statistical difference; the position of the movable antenna is limited in a preset area omega r, the minimum spacing dmin is equal to lambda / 2, and lambda is the wavelength of a carrier wave; and the hidden throughput is maximized through the optimization.

Apparatuses, methods, and systems are disclosed for repeater configuration for channel state information reference signal. An apparatus includes a transceiver that receives a first configuration from a base station of a mobile wireless communication network, the first configuration comprising channel state information reference signal (“CSI-RS”) configuration information for amplifying and forwarding CSI-RS beams to a user equipment (“UE”) device from the repeater node. The transceiver receives a second configuration from the base station, the second configuration comprising configuration information for performing measurement and reporting of the CSI-RS beams. The transceiver receives repeater-specific CSI-RS to be forwarded to the UE device and transmits the repeater-specific CSI-RS to the UE device according to the first configuration.

The present disclosure is for supporting a sensing operation by using a multi-mode network controlled repeater (NCR) in a wireless communication system, and an operation method performed by the NCR may comprise the steps of: receiving at least one synchronization signal from a base station; acquiring system information from the base station; performing a random access procedure on the basis of the at least one synchronization signal and the system information; receiving first configuration information from the base station; configuring an internal signal path on the basis of one operation mode among a reflection mode and an amplification-and-transfer mode, which is determined on the basis of the first configuration information; and processing a signal from the base station on the basis of the operation mode.

Devices, methods, and systems are disclosed for repeater configuration for channel state information reference signals. One device (800) includes a transceiver (825) that receives a first configuration from a base station (121) of a mobile wireless communication network, the first configuration comprising channel state information reference signal ("CSI-RS") configuration information for amplifying and forwarding a CSI-RS beam from the device (800) to a user equipment ("UE") device (700). The transceiver (825) receives a second configuration from the base station (121), the second configuration comprising configuration information for performing measurements and reporting of the CSI-RS beam. The transceiver (825) receives a repeater-specific CSI-RS to be forwarded to the UE device (700) and transmits the repeater-specific CSI-RS to the UE device (700) in accordance with the first configuration.

Method and apparatus for dynamic control of power amplifier back off for repeaters. The apparatus uses a channel model to model a first signal at a channel output. The channel model models a channel between a receiver and a transmitter. The apparatus performs a PAPR reduction on the first signal at the receiver to generate a second signal having a reduced PAPR. The apparatus inputs the second signal through an inverse channel model to generate an output signal. The apparatus outputs the output signal to the receiver, such that the PAPR of the output signal is reduced at an input of the receiver.

The application provides a joint optimization method and device based on rate maximization and antenna selection, comprising: establishing a multi-antenna bidirectional relay amplify-and-forward system model; obtaining a system information rate expression according to the system model; constructing an amplify-and-forward factor and an antenna selection sequence optimization variable; combining the information rate expression to obtain a maximum information rate composite function about the amplify-and-forward factor and the antenna selection sequence, and establishing an optimization problem; and obtaining an analytical expression of the optimal amplify-and-forward factor and the antenna selection sequence under power constraint according to the maximum information rate function. Thus, the joint optimization design of the amplify-and-forward factor and the antenna selection sequence in the multi-antenna relay repeater is realized, the spatial diversity and cooperation diversity gain of the relay repeater system is fully exploited, the information rate of the system is effectively improved, and the complexity is low.

A base station assisted apparatus and method for impairment correction and handling of AF repeaters are described. An apparatus is configured to obtain a first indication of one or more conditions associated with a set of NL characteristics and a set of droop characteristics. The apparatus is also configured to measure the set of NL characteristics and the set of droop characteristics, wherein the set of NL characteristics and the set of droop characteristics are associated with a DPD training session. The apparatus is further configured to send, for the network node, one or more of: (1) a second indication of the measured set of NL characteristics and the measured set of droop characteristics; or (2) at least one of an excluded list of resources associated with interference at the wireless device or a set of indexes for the excluded list of resources.

A method for implementing fixed-wireless access (FWA) in a network having a next generation node B (gNB) and at least two FWA devices configured as customer premise equipments (CPEs) includes: providing a user-equipment-based smart repeater (UBSR) for FWA, wherein said UBSR is configured as a network controlled repeater (NCR) hosted by a first CPE; and dynamically splitting at least one of space, time, and frequency communications resources from the gNB into one portion dedicated to the first CPE hosting the UBSR and another portion amplify-forwarded to a second CPE downstream from the first CPE, wherein at least one of i) the second CPE is beyond the coverage area of the gNB, and ii) the second CPE has a blocked line-of-sight path to the gNB. The UBSR performs dual functionalities of a user equipment (UE) and an NCR mobile termination (NCR-MT) under a single UE identity of the UE.

A repeater includes: a mobile termination, configured to communicate with a network device via a control link to receive control information; and a forwarding entity, configured to perform amplifying-and-forwarding of uplink (UL) and / or downlink (DL) radio frequency (RF) signals between the network device and a terminal equipment via a backhaul link and an access link, a behavior of the forwarding entity being controlled according to the control information received by the mobile termination; wherein the control information includes a first downlink control information format comprising N first information fields used for indicating a beam for access link of the repeater and N second information fields used for indicating a time-domain resource, N being an integer greater than 0; and wherein the N first information fields are sequentially associated with the N second information fields with one to one mapping, N is configured by a first higher layer parameter.

The invention discloses a magnetic induction multi-hop transmission method and system based on amplification forwarding, which are applied to a magnetic induction multi-hop transmission system comprising N magnetic induction coils, the first coil is a transmitting coil, the second coil to the (N-1) th coil are relay forwarding coils, and the Nth coil is a target receiving coil. The method comprises the following steps: transmitting a signal to a second coil through a first coil, and after the second coil receives the signal, amplifying the signal by adopting an amplification forwarding protocol and forwarding the signal to a next coil until an Nth coil receives the signal from an (N-1) th coil, calculating channel state information of each hop in the (N-1)-hop link and a receiving signal-to-noise ratio of a subsequent coil based on an equivalent circuit model; obtaining an expression of the outage probability and the average bit error rate under the condition of high signal-to-noise ratio based on the statistical distribution characteristics of the received signal-to-noise ratio; and solving the optimal transmitting power and the optimal deployment position of the first coil to the (N-1) th coil by taking the minimization of the outage probability and / or the average bit error rate as a target.

In some aspects, the techniques described herein relate to a method, including: in an access point (AP) device, wirelessly transmitting one or more control frames to a relay device to acquire relay transmission parameters for relay operations between the AP device and a destination station (dSTA) device through the relay device; comparing AF (amplify and forward) and DF (decode and forward) performance functions using the acquired relay transmission parameters; and selecting one of an AF and DF relay transmission modes based on the compared AF and DF performance functions.

An amplify-and-forward (AF) relay jamming signal can pass through any civil and military wireless communication system. Hence, AF relay jamming is dangerous and should be detected and suppressed before demodulation / decoding / decryption in wireless communication systems. The 5G positioning reference signal (PRS) and 5G sounding reference signal (SRS) play critical roles especially for autonomous driving and link establishment between a user equipment (UE) and a near gNodeB. Both the PRS and SRS are publicly known and vulnerable to AF relay jamming. The goal of this invention is to present an effective and low-complexity 5G-and-beyond UE positioning algorithm installed at a UE instead of a gNodeB against an AF 2-dimensional time delay (TD) and frequency shift (FS) relay jamming. Preliminary results for the proposed algorithm using both a 5G PRS and a Global Positioning System (GPS) receiver scenario are presented under a 2D and 1D AF TD relay jamming environment to validate the effectiveness of the proposed algorithm.

The invention discloses a power control method for bidirectional AF relay-assisted D2D communication, which relates to the technical field of wireless communication, and comprises the following steps: acquiring signals received by a first time slot RU and a downlink CU, then acquiring amplified and forwarded signals received by a second time slot DU1 and DU2 and received signals of an uplink BS, and combining a self-interference elimination technology so as to realize the power control of the bidirectional AF relay-assisted D2D communication. Obtaining a signal to interference plus noise ratio SINR1 and a signal to interference plus noise ratio SINR2 at the DU1 and the DU2 after the self-interference is eliminated; a cellular network adopts a time division duplex mode, a cellular link and a D2D link share the same spectrum resource, two possible transmission schemes are provided according to the relationship between the uplink and downlink stages of cellular communication and the two stages of bidirectional D2D communication, and when a base station has perfect instantaneous channel state information, the transmission efficiency of the base station is improved. According to the power control scheme, the performance of the D2D link is optimized by using the two performance indexes of the D2D link while the QoS requirement of the cellular link is met, so that the spectrum utilization rate can be improved, and the power loss is reduced.