Multi-dimensional radio channel models for indoor distributed communications
(2017)
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- Abstract
- Single- and multi-antenna indoor systems have been designed and used for various applications for some years now, but still there is a room for improvements. Channel modeling is one of the aspects where researchers and engineers face many challenges. Since indoor environments consist of many scatterers, mobility of the nodes introduces non-stationarity in the propagation channel. To enable successful design of communication systems, such an important issue must be taken into account. With that perspective, dedicated measurement campaigns and realistic radio propagation channel models are required in order to exploit fully the improvement potential. The main contributions and findings of this thesis can be summarized as follows: - Three measurement campaigns of indoor-to-indoor radio propagation channels were conducted at 3.8 GHz. - The stationarity period duration varies between 0.8-1.5 s for different investigated cases depending on the environment. - It turns out that small-scale fading within one stationarity period follows a weighted combination of different known distributions. This mixed type of fading can be described by a Second Order Scattering Fading (SOSF) distribution which reflects any combination of Rician, Rayleigh, and double-Rayleigh fading. - New double-ring geometry-based reference and simulation models for narrowband single- and multi-antenna SOSF channels are proposed. Next, second order-statistics of these channels are derived and analyzed. - New model for temporal evolution of angular statistics is proposed. - It is shown that a Hidden Markov Model based approach can be used to reproduce time-variant statistics of small-scale fading. It can be parameterized from measurements: empirical estimation and transition matrices were extracted for the three investigated environments. We observed that predominant fading mechanism can be described by a mixture of Rayleigh and Double Rayleigh distributions. - A methodology of time-variant power delay profiles has been designed in the room-to-room dynamic scenario. - Normal distribution with zero-mean and the variance extracted from measurements can be used for mean large-scale fading modeling and dynamic large-scale fading follows a t-location scale distribution.
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Citations
Vinogradov, E. (2017). Multi-dimensional radio channel models for indoor distributed communications. https://hdl.handle.net/2078.5/76649