Transcription of An Introduction to Wireless Technologies - unibz
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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 conver
electromagnetic spectrum source: jsc.mil radio light harmful radiation vhf = very high frequency uhf = ultra high frequency shf = super high frequency ehf = extra high frequency 4g cellular 56-100 ghz 3g cellular 1.5-5.2 ghz 1g, 2g cellular 0.4-1.5ghz uwb 3.1-10.6 ghz c = λ*f c= 299 792 458 m/s ~ 3*108 m/s
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