JPL's Wireless Communication Reference Website Slide Show

Area-mean power

· is determined by path loss

· is an average over 100 m - 5 km

Local-mean power

· is caused by local 'shadowing' effects

· has slow variations

· is an average over 40 l (few meters)

Instantaneous power

· fluctuations are caused by multipath reception

· depends on location and frequency

· depends on time if antenna is in motion

· has fast variations (fades occur about every half a wave length)

JPL's Wireless Communication Reference Website © Jean-Paul M.G. Linnartz, 1993, 1995.