12 results about "Amplify and forward" patented technology

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.

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.

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 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 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.

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.