In the previous chapter we focused on propagation effects over the radio link between a base station and a mobile terminal. We noted there that most modern wireless systems are organized into geographic cells, each controlled by a base station. (Among the exceptions, as noted there, are small-area systems such as local-area wireless networks and personal-area networks, to be discussed in Chapter 12. Ad hoc and wireless sensor networks, not discussed in this book, are other examples of networks not necessarily involving the cellular concept.) We were thus implicitly discussing the propagation effects encountered in a single cell. In this chapter we introduce ...
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