Aplicação dos Modelos Ocultos de Markov na Modelagem do Canal Rádio Móvel

Abstract

In recent years, the increasing advance of technologies and the number of mobile phone users has made necessary more accurate studies of the mobile radio channel behavior. Every year, new solutions are discussed with the aim of correctly dimensioning these channels, making them increasingly efficient. Since we recognize the importance of the channel in signal propagation, this thesis comes up to characterize the broadband mobile radio channel, in UHF band, for indoor environments, in a first step. Data acquisition was performed by channel sounding using the frequency scanning technique and, from the measured data, we evaluated the parameters of mean delay and delay spread related to the temporal dispersion of the channel. Subsequently, these parameters were used for channel modeling, performed with the application of Hidden Markov Models. The HMM results are unpublished and criticized at the end of this work.