Abstract:
Knowledge of ambient optical noise is essential for designers of free space optical links, for resilient designs. In this paper, a complete experimental
characterisation of the most common ambient optical radiation is presented. The study includes Tungsten filamen t sources, low and high frequency
fluorescent lights, IR headphones, TV remote controls, and daylight. Means to reduce their influence on the performance of the links are also given.
The results are valuable towards setting a standard way of comparing wireless IR links, ....etc

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Please send me the detailed overview of Channel tracking in Wireless OFDM systems. I request you to post it's current usage, it's background, it's future use. It's applications, competing technology, and the literature survey. ....etc

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To get full information or details of salt and pepper noise removal by median type noise detectors and detail preserving regularization please have a look on the pages

http://seminarsprojects.net/Thread-salt-and-pepper-noise-removal-by-median-type-noise-detectors-and-detail-preserving

http://seminarsprojects.net/Thread-salt-and-pepper-noise-removal-by-median-type-noise-detectors-and-detail-preserving?pid=84244&mode=threaded

if you again feel trouble on salt and pepper noise removal by median type noise detectors and detail preserving regu ....etc

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To get full information or details of antenna design for uwb noise communication and radar systems please have a look on the pages

http://seminarsprojects.net/Thread-radar-imaging-with-a-network-of-digital-noise-radar-systems

if you again feel trouble on antenna design for uwb noise communication and radar systemsplease reply in that page and ask specific fields ....etc

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To get full information or details of communication systems please have a look on the pages

http://seminarsprojects.net/Thread-laser-communication-systems--6013?pid=40579&mode=threaded

http://seminarsprojects.net/Thread-laser-communication-systems--6013?pid=29387&mode=threaded

http://seminarsprojects.net/Thread-satellite-communication-systems

if you again feel trouble on communication systems please reply in that page and ask specific fields in communication systems ....etc

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pooja raju
Ppt of OPTICAL OFDM FOR HIGH SPEED WIRELESS OPTICAL COMMUNICATION
how to prepare ppt on this seminar topic? ....etc

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Free space optical communications is a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications. In a manner similar to fiber optical communications, free space optics uses a light emitting diode (LED) or laser (light amplification by stimulated emission of radiation) point source for data transmission. However, in free space optics, an energy beam is collimated and transmitted through space rather than being guided through an optical cable. These beams of li ....etc

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Abstract
In the presented paper, the principle of frequency domain channel estimation for wireless OFDM systems will be shown. A well known noise reduction technique will be adapted to HIPERLAN/2 and IEE802.11a standards, and its positive effects will be demonstrated by simulation results. Channel tracking has not been considered by the WLAN standards named above, although it is well known that time-variant indoor radio channels can change their characteristics within one PHY burst. This paper presents some techniques for decision directed ....etc

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By
JOSHI G



Abstract

The demand for high-speed mobile wireless communications is rapidly growing.
OFDM technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems of the near future. This work presents an investigation into methods for maximizing the spectral efficiency of Orthogonal Frequency Division Multiplexing (OFDM) systems. The current standards such as IEE 802.11a in USA and H ....etc

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Prepared by:
Khaizuran Abdullah
Zahir M. Hussain


Abstract

Comparative studies on DWT-OFDM and FFTOFDM systems are presented. The model for DWT-OFDM includes zero-padding and vector transpose for transmitting the OFDM signal. MATLAB simulation commands are also described. The discrete wavelet transform-OFDM (DWT-OFDM) has to satisfy the orthonormal bases and the perfect reconstruction properties to be considered as wavelet transform. Different wavelet families have been used and compared with the conventional F ....etc

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