Propagation modelling and resource allocation in mobile radio communications

Bilibashi, Denis (2022) Propagation modelling and resource allocation in mobile radio communications, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria elettronica, telecomunicazioni e tecnologie dell'informazione, 34 Ciclo. DOI 10.48676/unibo/amsdottorato/10368.
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Over the past years, ray tracing (RT) models popularity has been increasing. From the nineties, RT has been used for field prediction in environment such as indoor and urban environments. Nevertheless, with the advent of new technologies, the channel model has become decidedly more dynamic and to perform RT simulations at each discrete time instant become computationally expensive. In this thesis, a new dynamic ray tracing (DRT) approach is presented in which from a single ray tracing simulation at an initial time t0, through analytical formulas we are able to track the motion of the interaction points. The benefits that this approach bring are that Doppler frequencies and channel prediction can be derived at every time instant, without recurring to multiple RT runs and therefore shortening the computation time. DRT performance was studied on two case studies and the results shows the accuracy and the computational gain that derives from this approach. Another issue that has been addressed in this thesis is the licensed band exhaustion of some frequency bands. To deal with this problem, a novel unselfish spectrum leasing scheme in cognitive radio networks (CRNs) is proposed that offers an energy-efficient solution minimizing the environmental impact of the network. In addition, a network management architecture is introduced and resource allocation is proposed as a constrained sum energy efficiency maximization problem. System simulations demonstrate an increment in the energy efficiency of the primary users’ network compared with previously proposed algorithms.

Tipologia del documento
Tesi di dottorato
Bilibashi, Denis
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
Ray Tracing, Dynamic ray tracing, Radiowave Propagation, Millimeter wave propagation, Vehicular Ad Hoc Networks, Doppler Effect, 6G Mobile Communications, cognitive radio, convex optimization, energy efficiency, power allocation, relay selection, spectrum leasing.
Data di discussione
5 Luglio 2022

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