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Indoor optical wireless systems

University of Baghdad College of Engineering Electronic & communication department 4 th year. Indoor optical wireless systems. By Zeyad khudhayer. Introduction.

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Indoor optical wireless systems

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  1. University of Baghdad College of Engineering Electronic & communication department 4th year Indoor optical wireless systems By Zeyad khudhayer

  2. Introduction • Because of rapidly growing of The number of personal computers and personal digital assistants flexible interconnection is need in distributed or centralized data communication systems. • To meet this requirement is to use wired physical connections and Wireless systems. • wired physical connections have some inherent problems, in setting up and in its expansion. these need more space, time to setup, monetary investment in copper, maintenance etc. • Wireless systems offer an attractive alternative. Both, radio frequency (RF) and infrared (IR) radiation are possible options in implementing wireless systems. • RF can support only limited bandwidth because of restricted spectrum availability and interference, IR technology can provide cable free communication at very high bit rates.

  3. In indoor optical wireless systems, laser diodes (LDs) or light emitting diodes (LEDs) are used as transmitter and photo-diodes as the receivers for optical signals and these cheaper as compared to RF equipment as well as wire line systems. • optical wireless systems are becoming more popular in various operating environments, such as houses (consumer electronics), offices, medical facilities, manufacturing plants, and business establishments.

  4. Infrared (IR) • light is electromagnetic radiation with a wavelength longer than that of  visible light. • 0.74 micrometers (µm), and extending conventionally to 300 µm wavelength at a frequency range of approximately 1 to 400 THz. • Infrared light is used in industrial, scientific, and medical applications. • Much of the energy from the Sun arrives on Earth in the form of infrared radiation. • . The balance between absorbed and emitted infrared radiation has a critical effect on the Earth's climate.

  5. Transmission Techniques Transmission Techniques may be classified according to the degree of directionality of transmitter and receiver. • Directed beam infrared (DBIR) radiation • Diffuse infrared (DFIR) radiation

  6. Quasi-diffuse infrared (QDIR) radiation • DESIGN CHALLENGES eye safety Interference from ambient light sources Multipath characteristics of the channel for diffused radiation

  7. Modulation Techniques: • Most common schemes suitable for indoor optical wireless are the On-Off Keying (OOK), Pulse Modulation (PM) and Sub-carrier Modulation. • Optical Multiplexing Techniques Wavelength-Division Multiple Access (WDMA) Space-Division Multiple Access (SDMA).

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