Introduction
With the improvements in semiconductors optical free space communication has become n attractive alternative to existing signal conducts as fibre or wireless (RF). It offers high data rates and is much less expensive than underground fibre. But there are a few restrictions, which may mean it remains an alternative. Many engineers are familiar with one of two successful existing technologies for data communication: (1) Guided wave (e.g. fibre optics) and (2) wireless free space communication (e.g. RF). Fibre optics offers extremely ....etc

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to get information about the topicfree space optical communication circuits full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-optical-space-communication-or-free-space-optical-communication-fso

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smart transmitters and receivers for under water communicationppt

Abstract

The number of unmanned vehicles and devices deployed underwater is increasing. New communication systems and networking protocols are required to handle this growth. Underwater free-space optical communication is poised to augment acoustic communication underwater, especially for short-range, mobile, multi-user environments in future underwater systems. Existing systems are typically point-to-point links with strict pointing and tracking requirements. In this paper we ....etc

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Smart Transmitters And Receivers For Under Water Communication
Underwater Free space optical communication promising alternative for Short range links. Considered to be point to point. New optical front end proposed the concept of smart transmitters and receivers. Smart Receivers is capable of detecting angle of arrival of signals. Smart transmitters electronically steers output beam towards particular direction. Estimates water quality from back scattered light.

Advantages are non mechanical pointing and tracking on a moving underwater veh ....etc

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Wireless Electronic Notice Board with Multi Point Receivers
using RF Communication System

IEE Reference:
Highly Reliable RF Communication System for point to multi point
communication
Vangala, S. Pishro-Nik, H.
Univ. of Massachusetts, Amherst


ABSTRACT
Notice Board is primary thing in any institution / organization or public
utility places like bus stations, railway stations and parks. But sticking various
notices day-to-day is a difficult process. A separate person is required to take
care of this ....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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To get full information or details of smart transmitters and receivers for underwater free space optical communication please have a look on the pages

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if you again feel trouble on smart transmitters and receivers for underwater free space optical communication please reply in that page and ask specific fields in smart transmitters and receivers for underwater free space optical communication ....etc

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Moments and Channel Capacity of Single and
Dual-Branch Receivers Over Weibull Fading Channels



ABSTRACT

Diversity combining receivers is the well-known technique used to combat fad-
ing and improve system performance. There are several diversity reception methods
employed in digital communication receivers including maximal-ratio combining, se-
lection combining and switched diversity. Among the combining methods, switched
diversity offers one of the least complexity solution for fading mitigation and ....etc

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