DOI: In this work we focus on security aspects of VLC communication, starting from basic physical characteristics of the communication channel. We analyze the risks of signal jamming, data snooping and modification. We… Expand. View via Publisher.
Save to Library Save. Create Alert Alert. Share This Paper. Background Citations. Methods Citations. Figures and Tables from this paper. Citation Type. The OWC system is known as the world's first pixel transmission communication system with a A recent study from Korea in this field resulted in developing a visible light V2V communication system using LED lights with 10kbps and 30m distance on daylight.
Figure 3 Inverse pulse position modulation 4-PPM [4] has been used in the system because this type of modulation scheme provides high data rate and gives high percent of dimming for pulse width modulation PWM [5]. The incapability of radio frequency waves for underwater communication due to the attenuation [6]. Underwater communication using VLC technique has its advantages and disadvantages [7]. Underwater Communication plays important role in military, industrial and scientific fields.
Underwater communication rate requirements starts from a few megabits to tens of megabits or even higher. Sound waves can also interfere with marine animals such as dolphins and whales. VLC can overcome the problems of attenuation and electromagnetic interference under water. The literature records the specific application of underwater VLC systems in nuclear power plant machine testing.
The underwater remote transport vehicle is equipped with a video and control signal transmission between the camera and a 20m remote station. At present, the main challenge of underwater visible light communication systems is that it is difficult to achieve long- distance communication due to underwater nature especially turbidity.
In response to this problem, the National University of Singapore and the Massachusetts Institute of Technology carried out research and demonstration of a 1.
Visible light waves has better directional characteristics than radio frequency waves and high data rates can be achieved in underwater VLC systems for medium and short distances [8]. Figure 4 and Figure 5 shows the block diagram of underwater VLC transmitter and receiver. Visible light communication has very high LOS, so it can communicate only in specific area and can be used for physical information protection communication it can be used in places where there is no interference Have the advantage of not having permission now, in the era of IOT, communication LEDs have evolved into 'smart lighting'.
It can control the lightness and color of light according to the people presence and the atmosphere of the interior, and it is also effective in reducing the efficiency of the energy in large building and cities. Along with smart lighting, the development of light emitting communication technology is proceeding rapidly.
Although research and develop and standardization proceeded, commercialization of visible light communication systems based on smart devices such as smart phones was difficult due to the necessity of additional hardware changes and the use of visible light communication dongles Photo diodes.
IEEE Also issued this time is the first part, which is composed of the Electronics Technology Standardization Research Institute high Silicon Semiconductor Liberation Army Information Engineering University and Tsinghua University were drafted also specifies the requirements for high-speed visible light communication, low speed visible light communication, and indoor positioning physical layer requirements based on visible light communication and the overall requirements of the media access control layer also applies to the development and use of visible light communication systems and equipment 7.
Range limitation: due to the requirements of the LoS, the technology is adequate for short communication distances. Higher data rate: because of the LEDs limited bandwidth this creates another big challenge issue to obtain higher data rates. Environment intense noise: artificial and natural lights is another challenge for VLC it is a main issue for outdoor VLC applications minimizing or overcoming the effect of artificial and natural lights is a challenging issue. Uplink supply: making the lighting sources is naturally suitable for transmission and broadcasting applications will be problematic.
Modulation difficulty: the simplest and most useful technique for modulation based on the direct intensity detection modulation is insufficient to solve many problems and challenges a difficult modulation method would be necessary to support desirable and effective data communication.
Parallel communication MIMO multiple input multiple outputs : an Interesting setup idea of visible light communication. Although, in theory, it may be achievable, the challenging part is the implementation part. Now a days, Data transmission without using any network is very tedious job to do.
In this paper, data and audio is transmitted and gotten through visible lights and control the devices. Parmar, 3Khushbu V. Due to increasing of internet users exponentially, Radio Spectrum is congested but the demand for wireless data double each year. LI-FI is a new epoch of high intensity light source of solid state design which bring clean lighting solutions to general and specialty lighting. Data transmission takes place from this LED bulb by varying the current at extremely high speeds which undetectable by the human eye.
German scientists succeeded in to creating Figure 1: Environment with LI FI Technology anMbps Megabits per second capable wireless network by using nothing more than normal red, blue, green and II. However, possibilities. If the LED is on, it transmits a light as it uses light instead of radio waves to transmit digital 1otherwise it transmits a digital 0.
The LEDs can be information. Moreover in this spectrum 10, LEDs as different frequency with each having a different data times more space is available and it also multiplies to 10, channel. Now if we available already [3][5]. We can overcome this drawback by using LI-FI technology as shown in below figure Figure 4: LI FI in Airways Fill Green information technology:LI-FI never gives any side effects on any living thing like radio waves and other communication waves which effects on the birds, human bodies, etc.
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