background and objectives: survival models are statistical technique to estimate or predict the overall time up to specific events. prediction is important in medical science and the accuracy of prediction is determined by a measurement, generally based on loss functions, called prediction error. the aim of this study is using parametric models to determine the factors influencing predicted sur...

Site-specific modeling of wireless communications channels has historically been too computationally intensive to incorporate into commodity network simulators. Simulation cannot accurately predict the behavior of wireless networks in real-world environments without modeling the physical channel realistically. Realistic models typically involve large amounts of floating point computation, to wh...

This report describes a prediction technique for the calculation of the field strength of radio waves over irregular terrain paths. The concept of an "equivalent rounded obstacle" is used to account for radio propagation losses over various possible irregular terrain shapes, including shapes which cannot easily be described geometrically. The technique replaces an arbitrary terrain profile with...

This paper presents an explicit formula for propagation path loss prediction of microcellular communication in an urban street scene. The formula is derived based on geometrical optics and diffraction theory and it takes into account multiple reflections along main streets, side streets and diffractions around corners. Comparisons between our theoretical results with measurements and ray tracin...

For proper planning and optimisation of radio network coverage quality at the mobile station terminals, prediction of propagation path loss with reasonable accuracy is important. This research work proposes the application of a hybrid neural modelling technique to predict of signal coverage propagation losses in typical urban environment. The modelling technique is based on combining a conventi...

In modern communication, network planning is very important for high quality service both coverage area and QoS including outage probability reduction. These require a tool, which is easy to use in planning the cellular network with high accuracy not only between base station and a mobile unit but also multi-hop network. There are many tools or models for cellular network planning such as semi-...