Radio signal propagation modeling plays an important role in designing wireless communication systems. Different models have been developed to predict radio propagation behavior for wireless communication systems in different operating environments. In this paper we limited the discussion to the latest achievements in radio propagation modeling, related to tunnels. The main modeling approaches used for propagation in tunnels are reviewed, namely, numerical methods for solving Maxwell equations, waveguide or modal approach, ray tracing based methods and two-slope path loss modeling. They are discussed in terms of modeling complexity and required information on the environment including tunnel geometry and electric as well as magnetic properties of walls.
COBISS.SI-ID: 27108391
This work discusses a novel approach to image acquisition which improves the robustness of captured data required for 3D range measurements. By applying a pseudo-random code modulation to sequential acquisition of projected patterns the impact of environmental factors such as ambient light and mutual interference is significantly reduced. The proposed concept has been proven with an experimental range sensor based on the laser triangulation principle. The proposed design can potentially enhance the use of this principle to a variety of outdoor applications, such as autonomous vehicles, pedestrians’ safety, collision avoidance, and many other tasks, where robust real-time distance detection in real world environment is crucial.
COBISS.SI-ID: 26952231
The invention relates to control and management of self organizing wireless cellular telecommunication networks. A method for network planning and frequency optimization in LTE networks determines the optimal base station configuration parameters. It comprises a base station initialization, an initial base station configuration, an iterative measurement procedure, an optimization process, a verification of operation, and a periodical maintenance procedure.
COBISS.SI-ID: 26902823
In this paper, we investigated users’ awareness level in regards to security built in mobile phones. By statistically processing a large sample of 7172 students in 17 Universities of 10 Eastern and Southern Europe countries, we were able to reach interesting results. The users were grouped into well-defined categories that correlate with their gender, age, country, field of study, brand and operating system of phone, connection type and monthly bill in the manner that these groups exhibit different values of the various metrics that were introduced. At the end, the subjective perception about user security was compared to the objective level of security which they actually have.
COBISS.SI-ID: 26614567
Location awareness becomes an important system functionality of existing and emerging wireless communication systems in order to provide location based services. The invention refers to iterative localization techniques within wireless communication systems for rural environment with limited number of base stations in the range of the mobile station and urban environment with multipath propagation and several base stations in the range of mobile station.
COBISS.SI-ID: 23790631