This paper presents results of a measurement campaign carried out at a carrier frequency of 24 GHz in indoor non-line-of-sight (NLOS) scenarios. The received signal is resolved with respect to the delays, azimuths, elevations, and complex amplitudes of the incident waves. A clustering pattern in both delay and angle of arrival is visible in the data. Clusters correspond to openings such as door...

For the radio channel at 5.2 GHz in typical domestic and office environments, channel models which are suitable for simulations are presented. The way of deriving the models from ray tracing and wideband channel sounding is explained in detail. Results are given for the model parameters and the accuracy of the modeling method is discussed.

This paper presents a new methodology to compute the electromagnetic field in practical cases of indoor communications. In particular, we consider the highly interesting case of the so-called interface modeling, i.e. when a plane wave propagates to the interior of a building. The proposed technique is based on a parabolic wave equation in three dimensions, while the cross section of the computa...

This paper reports 62.4GHz fixed wideband propagation measurements undertaken in six different LOS indoor environments (corridors and rooms) inside three buildings. Measurement analyses are presented in respect of static RMS delay spreads and received signal level. Uniformity of delay spread was observed for all the cases investigated. A correlation is observed with the static delay spread incr...

This work presents an accurate and realistic positioning approach for indoor environments based on fingerprinting and raytracing techniques. Fading caused by multipath seriously degrades the performance of communication systems operating inside buildings. For this reason, the proposed localization method considers multipath effects due to reflections and diffraction from walls, roof and floor. ...

Experimental characterisation of on-body radio channel for ultrawideband (UWB) wireless active tags is reported in this paper. The aim of this study is to investigate the performance of the commercially available wireless tags on the UWB on-body radio channel characterisation. Measurement campaigns are performed in the chamber and in an indoor environment. Statistical path loss parameters of ni...

In an indoor environment, channel variations which occur most frequently are due to the movement of personnel near the transmitting or receiving antennas and/or local movements of the terminals around a given location. Such spatial and short time variations in the indoor radio channel are studied and determined by performing wideband propagation experiments in line of sight and nonline of sight...

In WSN-based localization, there are many challenging points. The difficulty lies in the fact that communication signals in a space-limited indoor office environment are interfered and attenuated by multi-path, reflection, channel fading, deflection, diffraction, etc. In fact, it is quite difficult to develop a reliable signal propagation model in an office environment because it is challenging...