Visible light communication systems ii
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The attached narrated power point presentation discusses the merits, demerits, challenges faced and the standards as applicable to visible light communication systems. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
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1. Fiber optic networks are constantly increasing in speed and capacity to meet new application demands like interactive video.
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seminar paper on BROADBAND OVER POWER LINES. It is the method of data transfer through the existing power lines.
"Wherever electricity is available there could be broadband"
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NB-IoT is a 3GPP standard for low-power wide-area networks that enables connectivity for IoT devices. It has low data rates up to 100kbps but provides long battery life up to 10 years, low device costs under $4, deep indoor penetration, and supports millions of connected devices per cell. NB-IoT can be deployed in-band within existing LTE carriers or in a standalone mode in dedicated spectrum. It uses power saving modes and repetitions to optimize coverage and power efficiency for IoT devices requiring bi-directional communication over licensed cellular networks. 5G will further enhance cellular IoT capabilities with features like network slicing and mobile edge computing to support new applications involving massive machine type communications.
Ut talk feb 2017
Speaker: Dr. Mohammad Noshad
Postdoctoral Fellow
Department of Electrical Engineering
Harvard University, Cambridge, USA
Title: High-Speed Wireless Connectivity through Lights
Time: Saturday, February 4, 2017, 12:30 – 14:00
Location: School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran
Lifi data transmission
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Visible Light Communication
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Broadband tech 2005
The document summarizes a presentation on broadband over power line (BPL) technology given to the Washington Area CTO Roundtable. It provides an overview of BPL, describes how power lines can be used as a communications medium, discusses key aspects of BPL system architecture like frequency planning and components, and addresses challenges like the noisy power line channel environment. It also reviews the status of the BPL industry and big questions still facing commercialization efforts.
200G QSFP56 Optical Transceiver Data Sheet By JTOPTICS
The 200GBASE-SR4 100m QSFP56 optical transceivers are designed for use in 200 Gigabit Ethernet connections over OM3/OM4/OM5 multimode fiber networks. These transceivers conform to the QSFP MSA standards and meet the IEEE 802.3cd 200GBASE-SR4 specifications. Digital diagnostic features are accessible via the I2C interface, in accordance with the CMIS V4.0 specifications.
Characteristics of 200G QSFP56 optical transceivers include a hot-pluggable QSFP56 form factor, an integrated 200G PAM4 DSP, support for aggregate bit rates of 212.5Gb/s, and flexibility to accommodate 103.125Gb/s aggregate bit rates as needed. These transceivers exhibit low power dissipation (<5W) and adhere to RoHS-6 compliance (lead-free). Operating within a commercial case temperature range of 0°C to 70°C, they operate with a single 3.3V power supply.
The transceivers are capable of achieving a maximum link length of 70m over OM4 and 100m over OM5 multimode fiber, employing an uncooled 4 channels 850nm VCSEL array and a 4 channels PIN photo detector array. Other features include a 200GAUI-4 electrical interface, MPO-12 Connector receptacle, compliance with CMIS V4.0, and the inclusion of built-in digital diagnostic functionality.
IRJET- Audio Transmission and Waveform Shaping using Visible Light Commun...
This document discusses audio transmission and waveform shaping using visible light communication (VLC). It presents a system for real-time audio transmission using VLC and analyzes the bandwidth of the system by testing square waveforms with and without a waveform shaping circuit. The system transmits audio signals from a source like a mobile phone to a receiver using a white LED and solar panel. Testing of square waveforms shows that the bandwidth is higher when using a waveform shaping circuit, as it recovers the original waveform shape after transmission. The system demonstrates that VLC can transmit audio signals over a distance without data loss or noise and has benefits over traditional wireless communication technologies.
Bridge wave 4gwe-miami_02feb(3)
The document discusses optimizing backhaul for small cell networks using millimeter wave technology. It notes that picocells can help fill coverage gaps between macro cell towers. Millimeter wave radios are well-suited for small cell backhaul due to their high capacity, short range well-matched to small cell distances, small hardware size, and ability to provide multiple gigabit-per-second links at a low cost through high frequency reuse. The technology has been successfully tested in field trials with tier 1 mobile carriers and provides a scalable and cost-effective solution for small cell network backhaul requirements.
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International Journal of Computational Engineering Research(IJCER)
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Visible light communication systems ii
- 1. Visible Light Communication Systems - II MEC
- 2. Contents • Advantages of VLC Systems. • Disadvantages of VLC Systems. • VLC Challenges. • Need for Standardisation.
- 3. VLC Advantages Huge Bandwidth: - unlimited and unlicensed bandwidth. - 380 nm to 780 nm. - VLC 350 THz support multi-gigabit-per- second data rates with LED arrays in a multiple-input multiple-output (MIMO) configuration. - alternative to indoor IR that operates at 780–950 nm.
- 4. VLC Advantages Low Power Consumption: - provides both communication and lighting, at Gbps data rates. - consume low power compared to costly RF alternatives. Low Bandwidth: - inexpensive components, compact, light weight, amenable to dense integration, very long lifespan.
- 5. VLC Advantages - large unlicensed optical spectrum. - lower power-per-bit cost compared to RF communications. - cheaper. No health concerns: - no generate radiation that leads to public health concern.
- 6. VLC Advantages - lowers carbon dioxide emission. - little extra power consumption for communication. Ubiquitous Computing: - wide range of network connectivity. - may incorporate luminous devices like traffic signs, commercial displays, indoor/outdoor lamps, TVs, car head lights/tail lights.
- 7. VLC Advantages Inherent security: - high security. - highly intricate for a network intruder outside to pick up the signal. - alternative technology in sensitive or hazardous environments. Indoor localization: - existing RF-based global positioning system (GPS) gives inadequate/no network coverage.
- 8. VLC Advantages - high attenuation, multipath, and safety regulation, accuracy of only up to a few meters for the RF-based GPS. - VLC-based indoor positioning to attend to issues in enclosed environments. - high accuracy to within a few cm. - indoor localization system using the white LEDs.
- 9. VLC Advantages - LEDs give better light source more than 400 lux. - LEDs have longer lifespan, ecological and financial benefits. - high-speed data transmission. - simultaneous employment of light sources for data communication as well as illumination.
- 10. Challenges Flicker mitigation: - Flicker: variation in the brightness of light perceived by human naked eye. result of continuous switching on and off of the light source during data transmission. can instigate negative/harmful physiological changes in humans.
- 11. Challenges • Flicker prevented by making changes in brightness to be within the maximum flickering time period (MFTP). • MFTP - maximum time period within which the light intensity can be changed without any perception by the human eye. • Modulation formats for flicker mitigation. • IEEE 802.15.7 standard proposes variable pulse position modulation (VPPM) for VLC system.
- 12. Challenges Dimming support: • Variable pulse position modulation (VPPM) for VLC system for ability to control dimming. • VPPM integrates PPM and PWM to support communication with dimming control.
- 13. Challenges • High path losses. • Multipath induced intersymbol interference (ISI). • Artificial light-induced interference. • Blocking. • LED electro-optic response nonlinearity. • Interference between VLC devices. • Integration with existing technologies.
- 14. VLC Standardisation • Standardisation to tackle challenges. • Performed by Visible Light Communication Consortium (VLCC), Japan and IEEE. • Japan Electronics & Information Technology Industries Association (JEITA) CP-1221, JEITA CP-1222 and JEITA CP- 1223 published by VLCC. • IEEE 802.15.7 standard for physical and MAC layers - minimum benchmark for development of new products.
- 15. Why Standardisation • Providing access to several hundred THz bands. • Providing immunity against EMI. • Communication that complements extra services to the existing visible light infrastructure. • Specifying FEC schemes, modulation techniques and data rates for VLC communication.
- 16. Why Standardisation • Channel access mechanisms such as Contention Access Period (CAP), Contention-Free Period (CFP) and visibility support when channel access described. • PHY layer specifications, such as optical mapping, Tx-Rx turn around time, Rx-Tx turn around time and flicker and dimming mitigation explained.
- 17. Will Continue…..