Several traditional models exist to describe the multipath phenomenon in wireless communications, such as Rice, Nakagami-m, Hoyt, and Rayleigh. There are other new ones that propose a generalization in order to better fit fading environments, such as α-µ, κ-µ and η-µ. In this work, the κ-µ extreme distribution, a special case of the κ-µ fading channel, is investigated. The statistical characterization of the κ-µ extreme fading parameter, m, is presented, considering both indoor and outdoor field trial measurements. More specifically, the empirical probability density function and the autocorrelation function of the fading parameter of the κ-µ extreme distribution are obtained. Moreover, from the empirical data, the range of possible practical values is also obtained and discussed. Finally, the instantaneous magnitude variation of m considering the mobile receiver displacement is estimated. The results presented here provide important information about the actual usefulness of the κ-µ extreme fading model in mobile communication systems.

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This paper presents the results of field trial measurements in order to obtain the probability density functions and the cross-correlation functions of the fading parameters η and µ of the η-µ distribution. The ranges of possible practical values of the η and µ fading parameters are also obtained from the empirical data. In addition, the instantaneous magnitude variations of η and µ considering the mobile receiver displacement are estimated and discussed. The results provide important information about the practical usefulness of the η-µ fading model in mobile communication systems. Keywordsη-µ distribution, channel characterization, fading parameters, field measurements. Resumo-Este artigo apresenta os resultados de medições de campo com o objetivo de obter as funções densidade de probabilidade e as funções de correlação cruzada empíricas dos parâmetros de desvanecimento η e µ da distribuição η-µ. Os intervalos de possíveis valores práticos dos parâmetros de desvanecimento η e µ também são obtidos a partir dos dados adquiridos em campo. Ainda, as variações instantâneas de magnitude de η e de µ considerando o deslocamento do receptor móvel são estimadas e discutidas. Os resultados fornecem informações importantes sobre o uso prático do modelo de desvanecimento η-µ em sistemas de comunicações móveis. Palavras-Chave-Distribuição η-µ, caracterização de canal sem fio, parâmetros de desvanecimento, medições de campo.

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