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Mobile Handset Design by Sajal K. Das

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1

Introduction to Mobile Handsets

1.1 Introduction to Telecommunication

The word telecommunication was adapted from the French word télécommunication, where the Greek prefix tele- (τηλε-) means- “far off,” and the Latin word communicare means “to share.” Hence, the term telecommunication signifies communication over a long distance. In ancient times, people used smoke signals, drum beats or semaphore for telecommunication purposes. Today, it is mainly electrical signals that are used for this purpose. Optical signals produced by laser sources are recent additions to this field. Owing to the evolution of major technological advances, today telecommunication is widespread through devices such as the television, radio, telephone, mobile phone and so on. Telecommunication networks carry information signals from one user to another user, who are separated geographically and this entity may be a computer, human being, teleprinter, data terminal, facsimiles machine and so on. The basic purpose of telecommunication is to transfer information from one user to another distant user via a medium. God has given us two beautiful organs: one is an eye to visualize things and other is an ear to listen. So, to the end users, in general information transfer is either by voice or as a real world image. Thus, we need to exchange information through voices, images and also computer data or digital information.

1.1.1 Basic Elements of Telecommunication

The basic elements of a telecommunication system ...

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