Mobile communication
is burdened with particular propagation complications, making reliable wireless
communication more difficult than fixed communication between and carefully
positioned antennas. The antenna height at a mobile terminal is usually
very small, typically less than a few meters. Hence, the antenna is expected
to have very little 'clearance', so obstacles and reflecting surfaces in
the vicinity of the antenna have a substantial influence on the characteristics
of the propagation path. Moreover, the propagation characteristics change
from place to place and, if the terminal moves, these change with time.
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