in this paper, a new propagation model based on utd for multiple diffraction paths in cellular mobile radio communications in urban environments is proposed. moreover, the most rigorous novel utd-based expressions for multiple diffractions by buildings and excess path losses are d - rived and analyzed. for this purpose, building rows are supposed to have rectangular cross-sections with the same...

Wireless technology continues to experience rapid growth and development. With the ever increasing demand for wireless services and applications, more advanced tools are necessary to ensure the performance of these wireless systems. One of the most important tools for system development and radio planning are the radio propagation channel models. These models allow system designers and radio pl...

Network simulation tools are frequently used to analyze performance of MANET protocols and applications. They commonly offer only simple radio propagation models that neglect obstacles of a propagation environment. The radio wave propagation model has a strong impact on the results of the simulation run. This work shows different radio propagation models into a simulation tool. The model is bas...

The analysis of radio propagation in urban terrains became highly imperative owing to the fact that the environment is composed of different physical obstructions such as high-rise buildings, towers and bill boards situated on a grid-like pattern of streets. Radio propagation characteristics, to a large extent, vary from one type of environment to the other. In this paper, the suitability of th...

This paper concerns about the radio propagation models used for the upcoming 4 th Generation (4G) of cellular networks known as Long Term Evolution (LTE). The radio wave propagation model or path loss model plays a very significant role in planning of any wireless communication systems. In this paper, a comparison is made between different proposed radio propagation models that would be used fo...

Many wireless protocol simulation studies are performed under the assumptions that (i) nodes travel in a random fashion in unobstructed environments, and that (ii) radio wave propagation modeling is based on the freespace principle. We propose an urban mobility model, where mobile nodes traverse city streets using a variety of movement modes and where the urban environment is used as an input i...

Wireless communication is one of the most demanding applications for the telecommunications equipment designer. The mobile radio channel defines fundamental limitations on the performance of wireless communications systems. In this paper is presented mobile radio channel situated in different environments – rural and urban. Some of the most important factors are multipath propagation and shadow...

The increasing number of participants in modern mobile radio networks, especially with the prospect of the new CDMA systems, necessitates a more and more detailed and efficient radio network planning. The basis of network planning is always the prediction of the quality of transmission between the transmitter and the participant. In order to find the optimal location of the transmitters in a to...

with the rapid growth of indoor wireless communication systems, the need to accurately model radio wave propagation inside the building environments has increased. many site-specific methods have been proposed for modeling indoor radio channels. among these methods, the ray tracing algorithm and the finite-difference time domain (fdtd) method are the most popular ones. the ray tracing approach ...