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An Introduction to Wireless Technologies Part 1 F. Ricci 2010/2011 Content Wireless communication standards Computer Networks Reference model for a network architecture Frequencies and regulations Wireless communication Technologies Signals Bandwidth limited signals Signal modulation Data transfer rate Signal propagation Most of the slides of this lecture come from prof. Jochen Schiller s didactical material for the book Mobile Communications , Addison Wesley, 2003. Analogue vs. Digital Analogue transmission of analogue data The air pressure variations (analogue data) are converted (microphone) into an electrical analog signal in which either the instantaneous voltage or current is directly proportional to the instantaneous air pressure and then transmitted ( , traditional phone or radio) Analogue transmission of digital data The electric analog signal is digitized, or converted to a digital signal, through an Analog-to-Digital converter and then modulated into analogue signals and trasmitted ( , digital phones as GSM).

Wireless systems: overview cellular phones satellites cordless wireless LAN phones 1992: GSM-900 1994: GSM-1800 2001: IMT-2000 (UMTS) 1987: CT1+

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