Telecommunication Networks Group Wireless Channel Models

In this technical report analytical models of wireless channels are presented. The report addresses the reader interested in the various effects, which lead to the well known, unreliable and stochastic nature of wireless channels. The report is composed from various other books, reports and so, due to the reason that a comprehensive, but still easy understandable discussion of the matter for engineers working on protocols is hard to find. Instead many other presentations are quite specific, deal only with a certain amount of the topic, or do not give a certain required level of detail on the other hand. The report gives an insight into the matter of what influences the performance of wireless channels. Two major effects are distinguished in the report: multiplicative effects, attenuating the transmitted signal, and additive effects, distorting the received signal at the receiver. While the attenuating effects not always have to be considered as stochastic processes, the distroting effects are always of that kind. However, for all effects good mathematical representations are found, which might be utilized for considering the system perfomance by simulation or analysis. Furthermore, at the end this report, we also briefly give an example analysis of the performance of some digital wireless modulation channels.