In order to improve the security performance of multiuser visible light communication (VLC) and facilitate secure application optical wireless technology in Internet-of-Things, we investigate physical-layer a VLC system with non-orthogonal multiple access (NOMA). When light-emitting diode (LED) transmitter communicates legitimate users by downlink NOMA, both single eavesdropper multi-eavesdropper scenarios are considered. presence eavesdropper, based on transmission characteristics channel,...

In this paper, we investigate the physical layer security for a reconfigurable intelligent surface (RIS)-aided heterogeneous visible light communication (VLC) and radio-frequency (RF) network with two legitimate user equipments (UEs) in cooperative nonorthogonal multiple access (NOMA). An external eavesdropper (Eve) tries to eavesdrop information from channel. Since VLC is mainly available line-of-sight path, UEs Eve under worktable cannot directly receive signals optical point, device...

ABSTRACT This article optimizes the structural optimization of high‐temperature heating furnace used in front glass manufacturing process automobiles. In order to improve heat condition forming process, steady‐state thermal module finite element analysis software ANSYS Workbench is simulate automotive gear glass, and influence specific at rising temperature, coefficient expansion, radiation transfer, other parameters on accuracy are studied. The mechanical properties viscosity curve were...

Hybrid power line communication (PLC) / visible light (VLC) networks have been demonstrated to be crucial for indoor practical communications and attracted widespread attention. However, most current research in hybrid PLC/VLC focus mainly on reliability resource allocation, little has carried physical layer security. In this paper, we investigate the secure of a network with two non-orthogonal multiple access legitimate users. During two-hop PLC VLC transmission, eavesdroppers attempt...

In view of the secrecy requirements visible light communication (VLC) and massive connectivity demand future communication, this work investigates physical-layer security (PLS) for a VLC network based on nonorthogonal multiple access (NOMA). To date, however, research PLS in NOMA-enabled networks considers only users static state. The movements make it imperative to dynamically allocate optical points (OAPs) transmit power mobile (MUs). Such resource allocation problem is transformed into...

To solve the problem of parameter optimization in image sensor-based visible light positioning systems, theoretical limits for both location and azimuth angle sensor receiver (ISR) are calculated. In case a typical indoor scenario, maximum likelihood estimations ISR first deduced. The Cramer-Rao Lower Bound (CRLB) is then derived, under condition that observation values points affected by white Gaussian noise. For parameters LEDs sensors, simulation results show accurate estimates can be...

A 1.5μm pixel size, 8 mega density, dual conversion gain (DCG), back side illuminated CMOS image sensor (CIS) is described having a linear full-well capacity (FWC) of 13ke- and total noise 0.8e-RMS at 8x gain. The adopts world smallest pitch, stacked pixel-level connection (SPLC) technology with greater than 8M connections, maximizing fill-factor the photodiode dimensions associated transistors to achieve large FWC low performance same time. In addition, by allocating into two different...

We consider efficient communications over the multiple-input multiple-output (MIMO) multiway distributed relay channel (MDRC) with full data exchange, where each user, equipped multiple antennas and broadcasts messages to all other users via help of a number distributive relays. propose physical-layer network coding (PNC)-based scheme involving linear precoding for alignment, nested lattice PNC, lattice-based interference mitigation. Unlike most existing approaches characterizing degrees...

In the visible light communication (VLC) for parallel vehicles, emitted by headlamps cannot reach photodiode (PD), which is receiver installed on another vehicle. To solve this problem, mirror array-based intelligent reflecting surface- (IRS-) aided VLC system designed and performance with different number of mirrors transmission distance analyzed. The maximum between adjacent IRSs calculated via exhaustive method, nearest neighbor iterative search (NNIS) algorithm proposed IRS node...

Image sensor-based visible light positioning can be applied not only to indoor environments but also outdoor environments. To determine the performance bounds of accuracy from view statistical optimization for an image system, we analyze and derive maximum likelihood estimation corresponding Cramér–Rao lower vehicle position, under condition that observation values light-emitting diode (LED) imaging points are affected by white Gaussian noise. For typical parameters LED traffic in-vehicle...

Recently, the hybrid radio frequency (RF)/ visible light communication (VLC) network has been widely studied due to advantages of high data transmission and no interference between two networks. Taking physical layer security (PLS) into account, most work on RF/VLC focused single user. However, many practical scenarios require serve multiple users (MU). Thus, in this paper, we make a study PLS MU where messages each must be kept confidential from other also external eavesdropper. To enhance...

Driven by emerging materials technology, wireless communication system based on intelligent reflecting surface (IRS) has attracted more and attention. However, most of current IRS-assisted physical layer security (PLS) research aims at radio frequency (RF) or visible light (VLC) independent networks, few focused the PLS VLC/RF hybrid network which provides wide coverage via RF high-data speed VLC. In this paper, we study network, works in two successive hops, first hop VLC link is used for...

Evidence-enhanced detectors present remarkable abilities in identifying malicious social text with related evidence. However, the rise of large language models (LLMs) brings potential risks evidence pollution to confuse detectors. This paper explores how manipulate evidence, simulating misuse scenarios including basic pollution, and rephrasing or generating by LLMs. To mitigate its negative impact, we propose three defense strategies from both data model sides, machine-generated detection, a...

Abstract An intelligent reflecting surface (IRS)‐aided visible light secure communication system is investigated. In order to improve its security performance, a power splitting scheme adopted at the light‐emitting diodes. contrast most current research on physical‐layer in IRS‐aided systems where secrecy rate or capacity maximization problems subject various resource constraints were formulated, this letter takes reliability of transmission into account. The closed‐form expression outage...

We consider efficient communications over the multiple-input multiple-output (MIMO) multiway relay channel (mRC) with full data exchange, where each user, equipped multiple antennas, broadcasts its message to all other users via help of a multi-antenna relay. propose lattice-precoding based nested lattice coding scheme for considered MIMO mRC, and derive achievable rates proposed scheme. The is generally applicable mRCs an arbitrary number users. Particularly, we show that achieves...

The controlled rectifier circuit simulation study has been conducted in this paper with the MATLAB7.0Simulink power system model, provides analysis waveform of a single phrase full control bridge resistive load circuit, circuit's MATLAB model diagram and waveform, waveforms theory were analyzed compared.The results show that is correct.It proved proposed convenient, flexible, intuitive, thus it an effective auxiliary tool for teaching electronics experiments

Since successive interference cancellation in non-orthogonal multiple access (NOMA) is enabled at the strong user to remove signal of weak user, if information safety cannot be ensured, neither can user. The physical-layer security a two-user multiple-input single-output (MISO)-NOMA visible light communication (VLC) system presence passive eavesdropper was studied, with light-emitting diodes (LEDs) transmitting and photodiode (PD) receiver receiving. To demonstrate superiority MISO-NOMA VLC...

For most of the current research on physical-layer security in indoor visible light communication (VLC) systems, a static environment was mainly considered, where secure about users investigated. However, much problems remain to be settled mobile users. To improve secrecy performance users, two-dimensional circular optical atto-cell with protected zone is considered. The proposed VLC systems include LED transmitter Alice, user Bob and passive eavesdropper Eve. A typical random waypoint model...