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Correlation coefficients and coherence parameters of fading channels

Author(s):
Jose Ricardo Mendes
Total Authors: 1
Document type: Master's Dissertation
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
Defense date:
Examining board members:
Dalton Soares Arantes; Rui Fragassi Souza; João Crisostomo Weyl A. Costa
Advisor: Michel Daoud Yacoub
Abstract

This dissertation derives and examines correlation coefficients of signals in many fading channels, as well as specifies the respective coherence parameters - coherence distance, coherence time, and coherence bandwidth. Such parameters are extracted from the envelope correlation coefficient, statistic calculated here only for Ricean fading channels, owing to the complexity of its deduction. For more comprehensive models of fading channels, it is provided the power correlation coefficient, simple and usually accurate approximation of that coefficient. Finally, by means of numerical results, factors that affect the coherence parameters are enumerated: dominant waves influence fundamentally on the coherence distance and on the coherence time; mean power inequalities between the quadrature random components, mainly on the coherence bandwidth; anisotropy of the diffuse waves spreading, only on the coherence distance and on the coherence time; and nonstationarity of the environment, on all coherence parameters (AU)