The IEEE has established the standardization group 802.15.7r1 “Short Range Optical Wireless Communications”, which is currently in process of developing a standard for visible light communication (VLC). As with any other system, realistic channel models are critical importance VLC system design, performance evaluation, and testing. This article presents reference that were endorsed by Task Group evaluation proposals. These developed typical indoor environments, including home, office,...

In this letter, we propose a realistic channel model for visible light communication (VLC) assuming mobile user. Based on non-sequential ray tracing, first obtain impulse responses each point over the user movement trajectories, and then express path loss delay spread as function of distance through curve fitting. Our results demonstrate large variations in received power. system design, necessitates use adaptive schemes, where transmission parameters can be selected according to conditions....

In this study, we investigate a relay-assisted visible light communication (VLC) system where an intermediate source cooperates with the main source. Specifically, consider two sources in office space: one is information employed on ceiling and other task light. Our uses dc biased optical orthogonal frequency division multiplexing (DCO-OFDM) performs relaying to assist operates half-duplex mode for both amplify-and-forward decode-and-forward relaying. We bit error rate (BER) performance of...

In this paper, we investigate cooperative visible light communication (VLC) system where an intermediate source acts as a relay terminal. We assume that terminal operates in full-duplex mode. contrast to radio frequency counterparts, VLC is relatively easier implement due directive propagation characteristic of light. first model taking into account loop interference channel based on ray tracing simulations. Then, error rate performance the relay-assisted system. Our evaluations demonstrate...

In this paper, we investigate link adaptation for an orthogonal frequency division multiplexing (OFDM)-based multiple-input multiple-output (MIMO) visible light communication (VLC) system. The proposed adaptive OFDM VLC system supports both repetition coding (RC) and spatial (SM) as MIMO modes allows mode switching based on channel conditions. Regarding to the instantaneous signal-to-noise ratio RC SM modes, maximum constellation size that can be supported each subcarrier is determined....

Visible light communication (VLC) has recently gained popularity as a complementary technology to radio frequency (RF) based alternatives for vehicular communications low-cost, secure and RF interference free technology. In this paper, we propose IEEE 802.15.7 standard-compliant physical layer (PHY) implementation experimental evaluation, using commercial off-the-shelf (COTS) automotive emitting diode (LED) fog the purpose of low-latency safety message dissemination. We first show that...

Vehicular visible light communication (V-VLC) aims to provide secure complementary vehicle-to-everything-communications (V2X) increase road safety and traffic efficiency. V-VLC provides directional transmissions, mainly enabling line-of-sight (LoS) communications. However, reflections due nearby objects enable non-line-of-sight (NLoS) extending the usage scenarios beyond LoS. In this paper, we propose wide-band measurement based NLoS channel characterization, evaluate performance of direct...

Network slicing is one of the major solutions needed to meet requirements next generation cellular networks, under common network infrastructure, in supporting multiple vertical services provided by mobile operators. makes shared physical infrastructure appear as logically isolated virtual networks dedicated different service types where each Slice (NS) benefits from on-demand allocated resources. Typically, available resources distributed among NSs are correlated and needs allocate them...

In this paper, we investigate the performance of relay-assisted visible light communication (VLC) system over multipath channels. We consider an indoor environment where ceiling serves as information source and a desk helps forward to destination. The VLC is built on orthogonal frequency division multiplexing (OFDM) with either amplify-and-forward or decode-and-forward relaying. A realistic channel impulse response generated through ray tracing used. Through simulations, present bit error...

In this paper, we explore the use of visible light communication as a means wireless monitoring in gas pipelines. an effort to shed on limits presence gas, create three-dimensional simulation platform where pipeline size/shape, reflection characteristics interior coating, specifications (i.e., temperature, density, refractive index, transmittance, etc.) and sources detectors field view, lighting pattern, are precisely defined. Based ray tracing, obtain channel impulse responses within...

Visible light communication (VLC) builds upon the idea of using existing lighting infrastructure for wireless data transmission. In a conventional VLC network, each fixture acts as an access point (AP) which are connected to other through electrical grid well backbone. These VLC-enabled fixtures consist baseband unit (BBU) followed by optical front-end (OFE). this paper, we propose so-called centralized network (C-LiAN) aggregates all AP computational resources into central pool that is...

Abstract Visible light communication (VLC) is a short‐range wireless access technology based on the dual use of illumination structure. The frequency‐selective characteristics VLC channels motivate orthogonal frequency division multiplexing (OFDM). In addition, presence multiple sources in most indoor spaces makes multiple‐input–multiple‐output (MIMO) techniques natural solution for systems. this paper, we investigate design an adaptive MIMO OFDM system. Specifically, propose bit and power...

Internet-empowered electronic gadgets and content rich multimedia applications have expanded exponentially in recent years. As a consequence, heterogeneous network structures introduced with Long Term Evolution (LTE) Advanced increasingly gaining momentum order to handle data explosion. On the other hand, deployment of new equipment is resulting increasing both capital operating expenditures. These deployments are done under consideration busy hour periods which experiences highest amount...

Self-Organizing Networks (SON) which automate the mobile networks in a cost-efficient way can provide extensive benefits for network operators that are facing several challenges, such as providing maximum coverage and balanced/efficient usage of spectrum energy. However, major challenge future wireless cellular systems is design self-organizing architecture enable re-configurable, scalable, flexible, low-cost, efficient solutions supporting increasingly diverse applications, products,...

Vehicular hotspots for on-board Internet access using Long Term Evolution (LTE) as the backhaul network has recently gained popularity. Currently, Wi-Fi is most common technology to provide in-vehicle access, where data been relayed through on board LTE receiver. Despite its wide acceptance, coexistence and contention based rate limitations with necessitates alternatives schemes. This paper investigates performance of hybrid visible light communication (VLC) networks VLC network.Under...

Visible light communication (VLC) builds upon the dual use of LED-based lighting infrastructure for data transmission. It is particularly attractive user-dense environments and mainly positioned as a complementary wireless access technology to radio-frequency (RF) counterparts. The practical implementation hybrid light/radio networks requires design efficient vertical horizontal handover mechanisms exploit their features. In this paper, we propose an event-triggered adaptive mechanism...

In this paper, we consider multiple-input multiple-output (MIMO) visible light communication (VLC) systems. The physical layer of VLC system builds upon optical orthogonal frequency division multiplexing (O-OFDM). Repetition code (RC), spatial (SMUX) and modulation (SMUD) are considered as MIMO techniques. We evaluate the performance three O-OFDM systems under consideration through derivation bit error rate expressions.

Inter-vehicular connectivity to enhance road safety and enable highly autonomous driving is increasingly becoming popular. Despite the prevalent works on radio-frequency (RF) based vehicular communication schemes, visible light (VLC) considered be a promising candidate for communications due its low complexity RF interference-free nature. This paper investigates applicability of VLC real world measurements. Deployment multiple emitting diodes (LEDs) enables multiple-input multiple-output...

Visible light communication (VLC) building on the existing illumination infrastructure utilizes emitting diode (LED) luminaries as wireless transmitters. To achieve data rates order of gigabits per second in VLC systems, multiple-input multiple-output (MIMO) transmission has been identified a key technology. In this paper, we consider centralized network architecture where ceiling LED act transmitter elements distributed massive MIMO system. obtain full benefits MIMO, channel state...

Summary Software‐defined networking (SDN) concept provides many features including hardware abstraction, programmable and centralized policy control. This allows benefiting from recently developed open source frameworks to build service platforms a dynamic softwarized ecosystem of networking. There are two major technologies for building the next generation mobile network: Radio Access Network (RAN) sharing Cloud RAN (C‐RAN). ensures efficient usage network equipment among multiple operators...

Heterogeneous Networks (HetNets) adopted into Long Term Evolution Advanced networks, have become major candidate for next generation mobile networks. In HetNets, resource and interference management techniques crucial to ensure high spectral as well power efficiencies Mobile Network Operators (MNOs) since they use frequency reuse of one include cells that serve overlapping coverage regions. this paper, we investigate a new architecture with emphasis on applications Radio Access (RANs)...

Vehicular connectivity is envisaged to extend vehicle on-board camera videos the nearby vehicles in order increase drivers' road awareness. This paper demonstrates possibilities of video transmission captured by forward-looking via visible light communications (VLC) using taillights provide see-beyond front assistance. Line sight (LoS) inter-vehicular direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) based VLC with data rate 6.42 Mbps and lower latency than...