The ITU Radiocommunication Assembly, considering a) that many new short-range (operating range less than 1 km) mobile and personal communication applications are being developed; b) that there is a high demand for radio local area networks (RLANs) and wireless local loop systems; c) that short-range systems using very low power have many advantages for providing services in the mobile and wirel...

An overview of the propagation characteristics of ultrawideband (UWB) indoor radio channels is presented with an emphasis on the spatio-temporal channel properties. Extensive measurement results are provided and practical considerations are highlighted. The insight into robust UWB communications and sensor networks, provided by channel modeling, is discussed.

In most existing indoor acoustic ranging systems, a range is estimated based on measuring the TOA of an ultrasonic wave. Due to high directivity of ultrasonic transducers and high attenuation of ultrasonic waves with distance in air, these systems cannot provide a range in large indoor environments. To achieve longer ranges, a TOA-based acoustic ranging system that uses a low frequency audible ...

Radio wave propagation models are extremely important in radio network planning, design as well as in interference planning. Radio propagation is essential for emerging technologies with appropriate design, deployment and management strategies for any wireless network. It is heavily site specific and can vary significantly depending on terrain, frequency of operation, velocity of mobile termina...

This paper presents a complete ray-tracing based model which takes into account scattering from rough surfaces in indoor environments. The proposed model relies on a combination between computer graphics and radar techniques. The paths between the transmitter and the receiver are found thanks to a Bi-Directional Path-Tracing algorithm, and the scattering field after each interaction between the...

This book [1] was written at an important point in the development of applications of electromagnetic (radio) waves to communications, navigation, and remote sensing. Such applications require accurate propagation predictions for a variety of path conditions, and this book provides the theoretical basis for such predictions. The book is based on fundamental research in electromagnetic wave prop...

This paper presents the verification of indoor propagation channel simulations based on an intelligent ray launching algorithm (IRLA) in Ka-band millimeter-wave (mmWave) spectrum various environments, including a classroom, office, and corridor, by radio measurements. Power delay profiles (PDPs), path loss, root-mean-square (RMS) spreads were obtained from both simulation results measurement re...

This paper demonstrates a ray-tracing method for modeling indoor propagation channels at 60GHz. A validation of the raytracing model with our in-house measurement is also presented. Based on the validated model, the multipath channel parameter such as root mean square (RMS) delay spread and the fading statistics at millimeter wave frequencies are easily extracted. As such, the proposed ray-trac...

Multipath propagation in the lower troposphere plays a very important role in forming the structure of radio signals used for radio occultations. Processing radio occultation data in multipath regions requires the solution of the problem of the reconstruction of the ray structure of a wave eld. Two methods were formerly suggested for processing multipath data: back-propagation and radio-optic (...