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STATISTICAL WIRELESS CHANNEL MODEL        

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The wireless channel is a widely used but rarely understood element in the design of communication systems today. One can often find people working with various parameters of a wireless channel without an understanding of the basics. I have till date not found any good tutorial which explains all the basic elements of the channel in reasonable detail. Most books only touch upon some aspects of the channel and ignore the rest. Moreover, there is a large variation in the treatment of the topic across books which thoroughly confuses the reader.

In this article we introduce the channel as a two-dimensional random process and derive the various parameters used to characterise it. The focus of this article is to derive the different statistical parameters in an intuitive manner. The aim is to bridge the gap between the statistical model and the physical understanding of the channel. Therefore, we skip the mathematical derivations and focus on the physical significance of the different observable parameters that can be derived from the statistical model.