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Today, facilitated by RF circuit fabrication and digital switching techniques, affordable high speed telecommunication has been largely deployed across the world.
We know, communication means transfer of information from source to recipient. In traditional telephony, when source and recipient were located in long distance, this transfer used to happen by connecting source and recipient physically through conducting wires, which would carry information in the form of electrical signals. Now, what is Wireless Communication?
But since we are Engineers, let us leave aside such naive cases and have some qualitative examples of wireless communication systems. This information could be voice, text, picture, packet data etc. Usually, this message is encoded upon a carrier or a medium called the Baseband signal. The baseband signal carries no information on its own, but before reaching the transmitter, the information to be sent is added to it.
The transmitter then sends out the message into the communication channel. The channel is a medium through which the transmitter output is sent to the recipient. This in the wired system could be a wire, a coaxial cable, or an optical fiber. In wireless systems these are generally waves like IR or radio.
At the other end of the channel would be the receiver. It would extract the information from the incoming signal received, by subtracting the baseband signal from it.
The receiver output is the information that had come from the source, and this can be directed to the recipient. Cellular Communication Cellular Mobile Communication systems are wireless systems that divide a given geographical area into cells and use a large number of transmitters to communicate wirelessly within those cells. Therefore cellular communication ensures connectivity with a single network over a large geographical area. Evolution of Cellular Radio Communication Over the years, we have seen remarkable growth of cellular communication over radio.
With ever increasing subscriber base and limited radio resource, providing quality telecom services became difficult. Therefore Cellular communication has been continuously evolving into newer forms. Adapted in other countries.
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