Wireless Communication Fundamentals David Holmer

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Presentation transcript:

Wireless Communication Fundamentals David Holmer

Physical Properties of Wireless Makes wireless network different from wired networks Should be taken into account by all layers

Wireless = Waves Electromagnetic radiation Emitted by sinusoidal current running through a wire (transmitting antenna) Creates propagating sinusoidal magnetic and electric fields according to Maxwell’s equations: Fields induce current in receiving antenna

Wave Propagation Example electric field magnetic field propagation direction

Frequency & Public Use Bands Propagating sinusoidal wave with some frequency/wavelength C (speed of light) = 3x10 8 m/s Name900 Mhz2.4 Ghz5 Ghz Range Bandwidth26 Mhz83.5 Mhz200 Mhz Wavelength.33m / 13.1”.125m / 4.9”.06 m / 2.4”

Free-space Path-loss Power of wireless transmission reduces with square of distance (due to surface area increase of sphere) Reduction also depends on wavelength Long wave length (low frequency) has less loss Short wave length (high frequency) has more loss

Other Path-loss Exponents Path-Loss Exponent Depends on environment: Free space2 Urban area cellular2.7 to 3.5 Shadowed urban cell3 to 5 In building LOS1.6 to 1.8 Obstructed in building4 to 6 Obstructed in factories2 to 3

Multi-path Propagation Electromagnetic waves bounce off of conductive (metal) objects Reflected waves received along with direct wave

Multi-Path Effect Multi-path components are delayed depending on path length (delay spread) Phase shift causes frequency dependent constructive / destructive interference Amplitude Time Amplitude Frequency

Modulation Modulation allows the wave to carry information by adjusting its properties in a time varying way Amplitude Frequency Phase Digital modulation using discrete “steps” so that information can be recovered despite noise/interference 8VSB - US HDTV BFSK - Mote Sensor Networks QPSK - 2 Mbps & CMDA(IS-95)

Multi-transmitter Interference Similar to multi-path Two transmitting stations will constructively/destructively interfere with each other at the receiver Receiver will “hear” the sum of the two signals, which usually means garbage