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Shadowing is believed to degrade the Quality of Service (QoS) in wireless cellular networks. Assuming log-normal shadowing, and studying mobile's path-loss with respect to the serving Base Station (BS) and the corresponding interference factor (the ratio of the sum of the path-gains from interfering BS's to the path-gain from the serving BS), which are two key ingredients of the analysis and design of the cellular networks, the authors discovered a more subtle reality. They observe, as commonly expected, that a strong variance of the shadowing increases the mean path-loss with respect to the serving BS, which in consequence, may compromise QoS.
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