WHY PROPAGATION CHANNEL MEASUREMENT AND MODELING?
The performance of any transceiver, signal processing algorithm, channel code, etc., depends on the channel it is operating in. For wireless systems, this channel is the wireless propagation channel, whose properties differ significantly from the wired channel. A correct understanding and modeling of the propagation channel is thus a vital prerequisite for understanding the performance of wireless communications systems. The difficulties in wireless channel modeling are due to the complex propagation processes that form the basis of a wireless channel, involving reflections, scattering, diffraction, and transmission through a large number of irregular objects. For all practical purposes, it is thus necessary to derive simplified descriptions. The degree of admissible simplification, in turn, depends on the system for which the channel is intended. In the past 20 years, wireless systems have changed dramatically, from narrowband analogue systems, to wideband digital systems, to multi-an
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