scholarly journals A Time-Overlapping Multiplex VLC System for End-Edge Data Transmission

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Tingting Fu ◽  
Huanghong Zhu ◽  
Han Hai ◽  
Haksrun Lao
Keyword(s):  
Data Transmission ◽  
Electromagnetic Interference ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Transmission Rate ◽  
Pulse Amplitude ◽  
Visible Light Communication ◽  
Radio Communications ◽  
Environmental Light ◽  
New Type

Communication is one of the most important foundations in the Internet of Things. Although some cutting-edge technologies, such as 5G, have greatly empowered edge computing, electromagnetic interference and pollution make them impracticable in many environments. The visible light communication (VLC) is a new type of wireless communication technology with appealing benefits not presented in radio communications. VLC allows a lamp or other light source to not only serve as illumination but also simultaneously transmit data. Although traditional VLC multiplexing technologies have been able to achieve a high-speed data transmission rate, they require all receivers to use the same modulation means. In many scenarios, various-type receivers coexist; it is costly to incorporate multiple senders to implement adaptive content distribution in on-demand services. In this paper, we propose a new type of VLC multiplexing system, which realizes end-edge data transmission through pulse position modulation (PPM), pulse width modulation (PWM), and pulse amplitude modulation (PAM) simultaneously. Therefore, one edge server can serve multiple types of end-users without interference. In order to evaluate the performance of the system, we conduct experiments with different settings of communication distance, communication angle, and different environmental light conditions. For three modulations, the proposed system can achieve a transmission speed three times as that for a single modulation, and reach the accuracy rate of up to 99% within the proper communication range.

High-Speed Multiple-Valued Data Transmission Based on Time-Domain Pre-Emphasis Techniques

2010 ◽  
Vol 459 ◽  
pp. 260-270
Author(s):  
Yasushi Yuminaka ◽  
Kenichi Henmi
Keyword(s):  
Time Domain ◽  
Data Transmission ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Pulse Amplitude ◽  
Cmos Technology ◽  
Timing Resolution ◽  
Channel Effects ◽  
Domain Information ◽  
Lower Voltage

This paper describes a Pulse-Width Modulation (PWM) pre-emphasis technique which utilizes time-domain information processing to increase the data rate for a given bandwidth of interconnection. The PWM pre-emphasis method does not change the pulse amplitude as for conventional FIR pre-emphasis, but instead exploits timing resolution. This fits well with recent CMOS technology trends toward higher switching speeds and lower voltage headroom. We discuss multiple-valued data transmission based on time-domain pre-emphasis techniques in consideration of higher-order channel effects.

scholarly journals An Efficient Data Transmission with GSM-MPAPM Modulation for an Indoor VLC System

Symmetry ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1232 ◽  
Author(s):  
Bao ◽  
Hsu ◽  
Tu
Keyword(s):  
Visible Light ◽  
Short Distance ◽  
Pulse Width Modulation ◽  
Pulse Amplitude ◽  
Visible Light Communication ◽  
Spatial Modulation ◽  
Theoretical Scheme ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
Dimming Control

As an emerging wireless communication technique, visible light communication is experiencing a boom in the global communication field, and the dream of accessing to the Internet with light is fast becoming a reality. The objective of this study was to put forward an efficient and theoretical scheme that is based on generalized spatial modulation to reduce the bit error ratio in indoor short-distance visible light communication. The scheme was implemented while using two steps in parallel: (1) The multi-pulse amplitude and the position modulation signal were generated by combining multi-pulse amplitude modulation with multi-pulse position modulation using transmitted information, and (2) certain light-emitting diodes were activated by employing the idea of generalized spatial modulation to convey the generated multi-pulse amplitude and position modulation optical signals. Furthermore, pulse width modulation was introduced to achieve dimming control in order to improve anti-interference ability to the ambient light of the system. The two steps above involved the information theory of communication. An embedded hardware system, which was based on the C8051F330 microcomputer and included a transmitter and a receiver, was designed to verify the performance of this new scheme. Subsequently, the verifiability experiment was carried out. The results of this experiment demonstrated that the proposed theoretical scheme of transmission was feasible and could lower the bit error ratio (BER) in indoor short-distance visible light communication while guaranteeing indoor light quality.

scholarly journals SPREAD SPECTRUM TECHNOLOGY RESEARCH AND ITS APPLICATION IN POWER LINE COMMUNICATION SYSTEMS

T-Comm ◽  
2020 ◽  
Vol 14 (10) ◽  
pp. 45-52
Author(s):  
Edgar M. Dmitriyev ◽  
◽  
Eugeny V. Rogozhnikov ◽  
Andrey K. Movchan ◽  
Semyon M. Mukhamadiev ◽  
...  
Keyword(s):  
Data Transmission ◽  
Spread Spectrum ◽  
Communication Systems ◽  
High Speed ◽  
Transmission Rate ◽  
Power Lines ◽  
Transmission Systems ◽  
Data Transmission Rate ◽  
High Data ◽  
Speed Data Transmission

In the presented article, the results of the research of the spreading spectrum technology are given and its use in communication systems based on the data transmission over power lines is considered. One of the currently existing problems of data transmission systems over power lines is the absence of a compromise solution in ensuring the required data transmission rate and communication range. Ready-made solutions existing on the market provide either high data transmission rates over short distances or a communication long-range with rates not exceeding several tens of kilobits per second. The purpose of the article is to research the application of spread spectrum technology in data transmission systems over power lines. In the course of the experiment, it was found that the joint use of OFDM technology and the spread spectrum technology makes it possible to form a solution that provides communication over power lines over a distance of tens of meters with a data transmission rate of at least 5 Mbps. This article compares the TP-Link 500 Mbps modem for broadband high-speed data transmission, and the NWEPLC-1-G3M modem for narrowband low-speed data transmission. The results of modeling a communication system with different lengths and types of spreading sequences for BPSK and QPSK modulations are presented. An assessment of the interference protection was carried out. The results of an experimental research of the spectrum spreading technology on a model of a data transmission system over power lines in terms of range and transmission rate in comparison with existing devices on the market are presented. The results obtained can be used in the design of communication systems over power lines.

scholarly journals A Signal Amplification-based Transceiver for Visible Light Communication

2020 ◽  
Vol 26 (11) ◽  
pp. 123-132
Author(s):  
Augustus Ehiremen Ibhaze ◽  
Frederick O Edeko ◽  
Patience E Orukpe
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
High Speed ◽  
Data Transfer ◽  
Visible Light Communication ◽  
Wireless Technology ◽  
Capacity Enhancement ◽  
Large Bandwidth ◽  
High Speed Data ◽  
Speed Data Transmission

Visible light communication (VLC) is an upcoming wireless technology for next-generation communication for high-speed data transmission. It has the potential for capacity enhancement due to its characteristic large bandwidth. Concerning signal processing and suitable transceiver design for the VLC application, an amplification-based optical transceiver is proposed in this article. The transmitter consists of a driver and laser diode as the light source, while the receiver contains a photodiode and signal amplifying circuit. The design model is proposed for its simplicity in replacing the trans-impedance and transconductance circuits of the conventional modules by a simple amplification circuit and interface converter. The system was tested at communication distances of 1m and 3.5m using a terminal emulation program for data transfer between two computing devices.

scholarly journals Smart Home using Visual Sensor Network and Li-Fi Technology

2019 ◽  
Vol 8 (4) ◽  
pp. 4791-4796
Keyword(s):  
Sensor Network ◽  
Data Transmission ◽  
Smart Home ◽  
High Speed ◽  
Transmission Rate ◽  
Human Life ◽  
Visual Sensor ◽  
Visual Sensor Network ◽  
The Internet Of Things

One of the most interest gaining and intellectual applications of the Internet of Things (IOT) is Smart Home. It enhances the quality of human life and brings more comfortability, convenience and savings. In this paper, an intellectual home procedural system is proposed which is based on Li-Fi technology as medium of communication between the connected devices. It uses wireless visual sensor network as video surveillance system. Li-Fi is a bi-directional high speed connected technology that supports sharing (sending and receiving) of data by illuminating the usage of LED bulbs. The usage of such innovation gives a surety of a higher level of security, higher data transmission rate, less consumption of energy and more convenience.

scholarly journals Linear Precoding Designs for MIMO VLC Using Multi-Color LEDs under Multiple Lighting Constraints

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 408 ◽  
Author(s):  
Ye Xiao ◽  
Yi-Jun Zhu ◽  
Zheng-Guo Sun
Keyword(s):  
High Speed ◽  
Mean Squared Error ◽  
Transmission Rate ◽  
Multiple Input Multiple Output ◽  
Visible Light Communication ◽  
Mimo Channel ◽  
Practical Applications ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Technology

Multiple-input multiple-output (MIMO) technology as an efficient approach to improve the transmission rate in visible light communication (VLC) has been well studied in recent years. In this paper, we focus on the MIMO VLC system using multi-color LEDs in the typical indoor scenario. Besides the correlation of the MIMO channel, the multi-color crosstalk interference and quadrangle chromaticity region are also considered to increase the practicality of this system. With the constraints of power, amplitude and chromaticity, an iterative algorithm to minimize mean-squared-error (MSE) is proposed to jointly design the precoder and equalizer. Our proposed algorithm provides an effective method to get the optimal precoder by updating optimization variables iteratively. As the equalizer matrix is fixed at each iteration, the main non-convex precoding design problem is transformed into a convex optimization problem and then solved. With the utilization of multi-color LEDs, our proposed precoding method would be promising to promote the practical applications of high-speed indoor optical wireless communication. Simulation results show that our proposed method owns better performance than conventional chromaticity-fixed schemes and zero-forcing precoding designs.

scholarly journals Hybrid modulation schemes for data transmission improvement of indoor visible light communication system

2018 ◽  
Vol 7 (4) ◽  
pp. 2822 ◽  
Author(s):  
Abdelhalim Zekry ◽  
Christena Ghandour ◽  
Nazmi A. Mohammed ◽  
S El-Rabaie
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
Orthogonal Frequency Division Multiplexing ◽  
Pulse Width Modulation ◽  
Mathematical Formulation ◽  
Visible Light Communication ◽  
Pulse Position Modulation ◽  
Dimming Control ◽  
Efficient Data ◽  
Modulation Schemes

This work enhances the bit rate characteristics, receiver sensitivity and power requirements of multicarrier modulation schemes (MCM) for visible light communication (VLC) dimming control system at bit error rate (BER) less than 10-3. This study develops the mathematical formulation for merging pulse position modulation (PPM) and overlapping pulse position modulation (OPPM) with M-ary quadrature amplitude modulation DC-Biased optical orthogonal frequency division multiplexing (M-QAM DCO OFDM), which can achieve efficient data transmission while maintaining communication quality. These schemes are then compared with the conventional merging (i.e M-QAM DCO OFDM with pulse width modulation (PWM)). Relating to the recent advances in the field, the additional comparative study is established with the latest merging platform (i.e. M-QAM DCO OFDM with multiple pulse position modulation (MPPM)). 

High-Speed Data Transmissions Using Tomlinson-Harashima Precoding

2013 ◽  
Vol 596 ◽  
pp. 199-203 ◽  
Author(s):  
Yosuke Iijima ◽  
Yasushi Yuminaka
Keyword(s):  
Data Transmission ◽  
High Speed ◽  
High Performance ◽  
Average Power ◽  
Pulse Amplitude ◽  
Coaxial Cable ◽  
Experimental Implementation ◽  
Low Pass ◽  
High Speed Data ◽  
Speed Data Transmission

High-speed interfaces become an important role to achieve high performance VLSIsystems. This paper demonstrates a high-speed data transmission technique using Tomlinson-Harashima Precoding (THP). The THP can compensate for low-pass effect of an interconnec-tion at a transmitter, and it can also limit peak and average power of a transmitted signal. Inthis paper, a 200Mbps 4-PAM(Pulse-amplitude modulation) transmitter is designed and simu-lated to demonstrate the THP performance. The experimental implementation using an FPGAdemonstrates high-speed transmission over a long 3D2V coaxial cable.

A Novel CML Latch-Based Wave-Pipelined Asynchronous SerDes Transceiver for Low-Power Application

2019 ◽  
Vol 29 (07) ◽  
pp. 2050110
Author(s):  
Mahesh Kumawat ◽  
Mohit Singh Choudhary ◽  
Ravi Kumar ◽  
Gaurav Singh ◽  
Santosh Kumar Vishvakarma
Keyword(s):  
Low Power ◽  
Data Transmission ◽  
High Speed ◽  
Frequency Synthesizer ◽  
Technology Development ◽  
Transmission Rate ◽  
Current Mode ◽  
Total Power ◽  
Single Chip ◽  
Transmission Speed

In the present technology development billions of transistors are fabricated on a single chip, which improves the performance of circuits in terms of high data transmission speed and power consumption. This requirement of data transmission speed is achieved with the help of high-speed transceivers. In this paper, we present a high-speed asynchronous wave-pipelined serializer and deserializer (SerDes) transceiver implemented using current-mode logic (CML). This asynchronous transceiver circuit does not require a clock and therefore it saves large amount of power which is consumed in the phase locked loop (PLL) and frequency synthesizer circuits. Further, the proposed design is built using CML which saves more power. CML circuit operates at relatively higher speed as compared to CMOS circuits which helps the circuit to operate at higher data rate. Compared to conventional CML latch, a novel CML latch is proposed in our design to increase the speed. The circuit is implemented in standard CMOS 65-nm technology. The total power consumed by the serializer and deserializer is 9.32[Formula: see text]mW, which is very less as compared to published related works. The proposed asynchronous SerDes transceiver operates at 18.1-Gbps data transmission rate with low power dissipation.

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