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Vehicle Communication with Environment Using Light Modulation

IP.com Disclosure Number: IPCOM000236462D
Publication Date: 2014-Apr-29
Document File: 3 page(s) / 49K

Publishing Venue

The IP.com Prior Art Database

Related People

G.W.R. Leibbrandt: INVENTOR [+2]

Abstract

Wireless communication between physically separated entities is typically accomplished via traditional networking protocols such as Wi-Fi or Mobile Networking. However, use of these technologies require special hardware and communication frequency slots. Objects such as vehicles include light sources for obvious purposes. These light sources can be used to send communication via light modulation to other objects. Use of these light sources for the additional purpose of transmitting communication signals provide cost saving because unlike traditional networking technologies, no special wireless transmitters and associated hardware are needed when the communication is being performed using already built in light sources. In additional, unlike a communication system based on traditional networking technologies, a communication system using light sources requires no additional power and associated power harness.

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Vehicle Communication with environment using light modulation

Wouter Leibbrandt, Radu Surdeanu, NXP BV

Abstract

Wireless communication between physically separated entities is typically accomplished via traditional networking protocols such as Wi-Fi or Mobile Networking. However, use of these technologies require special hardware and communication frequency slots. Objects such as vehicles include light sources for obvious purposes. These light sources can be used to send communication via light modulation to other objects. Use of these light sources for the additional purpose of transmitting communication signals provide cost saving because unlike traditional networking technologies, no special wireless transmitters and associated hardware are needed when the communication is being performed using already built in light sources. In additional, unlike a communication system based on traditional networking technologies, a communication system using light sources requires no additional power and associated power harness.

Details

Visible Light Communication (VLC)1 is a well-known data communications medium. VLC may be used for automotive vehicles to continuously signal to their surroundings some key parameters that are relevant to other road users or to infrastructure elements. Those parameters can be among others: current speed, acceleration/deceleration, priority (e.g. ambulance), GPS location, cruise-control on/off, autopilot on/off, weight of the car/truck.

VLC can be easily accomplished with vehicles' LED based headlights or daytime running lights. As opposed to incandescent lamps, LEDs can be amplitude and Pulse Width Modulation (PWM)2 modulated at high frequencies (from Hz/kHz regime for normal lighting operation up to tens of MHz for IR communication purposes and 3D cameras using time-of-flight principle). The key parameters will be coded in a string that typically will be less than 100 bytes, though there is no limit in principle. This string will be broadcast several times per second.

For some use cases, it can also be useful to broadcast same or similar information through the tail lights. Also other light units on the car (indicators, side-mirror lighting) can be used.

1 http://en.wikipedia.org/wiki/Visible_light_communication

Visible light communication (VLC) is a data communications medium using visible light between 400 and 800 THz (780-375 nm). Using visible light is less dangerous for high-power applications because humans can perceive it and act to protect their eyes from damage.

2 http://en.wikipedia.org/wiki/Pulse-width_modulation

Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique that conforms the width of the pulse, formally the pulse duration, based on modulator signal information. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial...