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- 2012-11-26
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Description: Radio Propagation
• Large scale fades
– Attenuation: in free space, power degrades by 1/d2
– Shadows: signals blocked by obstructing structures
• Small scale fades
– Multipath effects:
» Rapid changes in signal strength over a small area or
time interval
» Random frequency modulation due to varying
Doppler shifts on different multipath signals
» Time dispersion (echoes) caused by multipath
propagation delays
– Even when mobile is stationary, the received signals may
fade due to movement of surrounding objects
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