3Channel Characterization
Abstract
Cellular mobile communication systems operate in the worst terrestrial environments characterized by mobility and severe random electromagnetic scattering, making the propagation behavior therein substantially different from its counterpart in the free space. Channel characterization is, therefore, an indispensable step in the design and testing of a cellular system, aiming to reveal how the scattering channels influence the power and frequency characteristics of a transmitted signal. Propagation loss behavior is of direct relevance to cellular power budget design and cellular planning. Large-scale and local fluctuation behaviors are critical to the assessment of the system's dynamic performance, whereas channel frequency characteristics affect the design of the wireless transceiver structure.
Channel characterization requires the incorporation of both physical and statistical descriptions. This chapter consists of three parts. Part 1 is devoted to the large-scale behavior, while Part 2 is devoted to the statistical modeling of the local behavior of a mobile signal. Finally, in Part 3, we present some algorithms for the generation of typical fading processes encountered in wireless communications.
3.1 Introduction
Wireless mobile communication is characterized by the random mobility of mobile units relative to their transmitters. As a mobile unit moves around a scattering field, the electromagnetic propagation paths vary accordingly, and so ...
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