scholarly journals Performance Analysis of Cooperative Non-Orthogonal Multiple Access in Visible Light Communication

2019 ◽  
Vol 9 (19) ◽  
pp. 4004
Author(s):  
Hesham Sadat ◽  
Mohamed Abaza ◽  
Safa M. Gasser ◽  
Hesham ElBadawy
Keyword(s):  
Visible Light ◽  
Multiple Access ◽  
Visible Light Communication ◽  
Data Rate ◽  
High Data Rate ◽  
Achievable Rate ◽  
High Data ◽  
Power Domain ◽  
Main Challenge ◽  
Analytic Expressions

Nowadays, visible light communication (VLC) systems have become one of the candidate technologies for high data rate indoor communications. However, the main challenge to develop a high data rate VLC system is the narrow modulation bandwidth of light-emitting diodes (LEDs). Power domain non-orthogonal multiple access (PD-NOMA) is a promising scheme to enhance the spectral efficiency of downlink VLC systems. In this paper, we introduce cooperative PD-NOMA to the system to improve the signal reception for the far users. We evaluate the bit error rate (BER) and achievable rate performance of non-cooperative and cooperative PD-NOMA under perfect channel state information (CSI). Moreover, we drive analytic expressions for the BER and provide a Monte Carlo simulation results for verifying the validity of the derived analytical BER results. The results show that cooperative PD-NOMA outperforms non-cooperative PD-NOMA by 8.2 dB at BER 10−6 and by achievable rate 14.1 bit/s/Hz at 45 dB in a two-user scenario.

Lens design-based optimization of path loss in a high data-rate indoor visible light communication link

2020 ◽  
Author(s):  
Faheem Ahmad ◽  
Sathisha Ramachandrapura ◽  
Jyothsna KM ◽  
Rabindra Biswas ◽  
Varun Raghunathan
Keyword(s):  
Visible Light ◽  
Path Loss ◽  
Visible Light Communication ◽  
Data Rate ◽  
High Data Rate ◽  
Communication Link ◽  
Lens Design ◽  
High Data

An Intelligent Vehicle Control System for Enhancing Road Safety Using Optimal Visible Light Communication Network

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Shaeista Begum ◽  
Nagaraj B. Patil
Keyword(s):  
Control System ◽  
Visible Light ◽  
Data Transmission ◽  
Exchange Process ◽  
Visible Light Communication ◽  
Vehicle Control ◽  
Data Rate ◽  
High Data Rate ◽  
Intelligent Vehicle ◽  
High Data

AbstractA visible light communication (VLC) provides potential and effective communication paradigm due to the demand of high data-rate applications. VLC networks, consisting of multiple light emitting diodes (LEDs) and it provides the low-cost high data-rate transmission to multiple users simultaneously in indoor environments. VLC has been recently introduced as a secure directional data transmission in vehicle to vehicle to provide an intelligent vehicle control system. However, the performance of this system is mostly affected by the collision of data transmission between different users. In this paper, we introduce an optimal visible light communication (OVLC) network that allows vehicles which have provides collision aware data transmission to improve the chance of transmitting information successively according to the network condition. Firstly, the next forwarding node is selected by the chaotic fish swarm optimization (CFSO) algorithm with the help of vehicle information’s such as intensity of light, the distance and speed of neighboring vehicles. The second contribution is to illustrate the congestion control (CC) system for avoiding extra time due to the control packets exchange process. The optimal result is then forward to the source vehicle equipped device, which helps the driver to make a healthy to control vehicle and efficiently avoid or prevent road accidents under different circumstances. The results show that the proposed OVLC network performs very efficient than existing network in terms of quality metrics, such as throughput, delay, packet loss rate, energy consumption and fairness index.

PAPR REDUCTION IN MIMO SC-FDMA- A SURVEY

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
HARSHA PRAKASH ◽  
C.D. SURIYAKALA
Keyword(s):  
Power Amplifier ◽  
Communication Systems ◽  
Multiple Access ◽  
Average Power ◽  
Data Rate ◽  
High Data Rate ◽  
Modulation Method ◽  
Frequency Division ◽  
High Data ◽  
Power Amplifier Efficiency

To meet the requirements of high data rate, third generation partnership project (3GPP) has come across the development of long term evolution (LTE). High data rate can be achieved with the help of an advanced modulation method. Orthogonal Frequency Division Multiple Access (OFDMA) was considered as a modulation method especially in the downlink of the communication systems. It gives many advantages like frequency diversity, increased capacity and robustness against impulse noise. Besides these advantages, a major drawback of OFDMA is its high peak-to-average power ratio (PAPR). High PAPR affects the system by lowering the power amplifier efficiency, increased complexity as well as shorter battery life. In case of uplink communication, where better peak power characteristics benefit the mobile terminals with respect to power efficiency, OFDMA is not a possible solution. To handle such situations, 3GPP has introduced a modified form of OFDMA which is known as Single-Carrier Frequency Division Multiple Access (SC-FDMA). It provides same advantages as OFDMA along with low PAPR. To further improve the bit error rate (BER) performance of the system and power amplifier efficiency Multiple-Input Multiple-Output (MIMO) can be extended to SC-FDMA system. This paper surveys causes, effects and possible solutions of high PAPR in a communication system.

An Introduction to LiFi and Review of Prototypes Designed on FPGA and Other Hardware

2020 ◽  
pp. 69-99
Author(s):  
Faisal Khan Khaskheli ◽  
Fahim Aziz Umrani ◽  
Attiya Baqai
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
High Data Rate ◽  
Low Power Consumption ◽  
Modern World ◽  
High Data ◽  
Starting Point ◽  
Modulation Techniques ◽  
Market Status ◽  
Led Lights

The current wireless networks are highly deficient when it comes to catering to the needs of the modern world with applications such as IoT and online interactive gaming. LiFi (visible light communication) has attracted interest as a solution to this problem due to its high data rate, wider spectrum, low power consumption, higher security, lower cost, and immunity to EMI. The idea behind LiFi is to use LED lights already available for space lighting for the purpose of transmitting. The chapter begins with a brief introduction to LiFI and then takes the reader through the history and market status of the technology all the way through to popular modulation techniques and finally ends with summarizing the transceiver prototypes designed previously with special emphasis on FPGA-based prototypes. The chapter provides a starting point for young budding researchers interested in LiFi and its implementation.

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