E-Technology: Analog Communication

Analog Communication
Analog communication is adata transmitting technique in a format that utilizes continuous signals to transmit data including voice, image, video,electrons etc. An analog signal is avariable signal continuous in both time and amplitude which is generaly carried by use of modulation.
Analog Signal
Analog signal is any continuous signal for which the time varying feature (variable) of the signal. It differs from adigital signal in terms of sound fluctuations in the signal which are meaningful
http://cnx.org/content/col10134/latest/
http://cnx.org/content/m10224/latest/
http://www.adobe.com/education/solutions/pdfs/dc_for_all_students.pdf
http://books.google.com/books?id=mF7X_8D7_BIC&printsec=frontcover&dq=wireless+communications&source=bl&ots=4ZoGJoAAL9&sig=80Tm-Mn9STPdcwC2VN6CRogDA1s&hl=en&ei=N0B9TKXjCZOisAP4pImDBw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDgQ6AEwAQ#v=onepage&q&f=false
http://www.camiresearch.com/Data_Com_Basics/data_com_tutorial.html

Information technology Communication (Satellite)

1. The Satellite The satellite itself is also known as the space segment, and is composed of three separate units, namely the fuel system, the satellite and telemetry controls, and the transponder. The transponder includes the receiving antenna to pick-up signals from the ground station, a broad band receiver, an input multiplexer, and a frequency converter which is used to reroute the received signals through a high powered amplifier for downlink. The primary role of a satellite is to reflect electronic signals. In the case of a telecom satellite, the primary task is to receive signals from a ground station and send them down to another ground station located a considerable distance away from the first. This relay action can be two-way, as in the case of a long distance phone call. Another use of the satellite is when, as is the case with television broadcasts, the ground station's uplink is then downlinked over a wide region, so that it may be received by many different customers possessing compatible equipment. Still another use for satellites is observation, wherein the satellite is equipped with cameras or various sensors, and it merely downlinks any information it picks up from its vantagepoint. 2. The Ground Station. This is the earth segment. The ground station's job is two-fold. In the case of an uplink, or transmitting station, terrestrial data in the form of baseband signals, is passed through a baseband processor, an up converter, a high powered amplifier, and through a parabolic dish antenna up to an orbiting satellite. In the case of a downlink, or receiving station, works in the reverse fashion as the uplink, ultimately converting signals received through the parabolic antenna to base band signal. Various Uses of Satellite Communications a. Traditional telecommunication b. Cellular. c. Television signals. d. Marine communication. e. Spacebourne Land Mobile f. Satellite Messaging for Commercial Jets g. Global Positioning Services

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Analog Communication