Now ever days positioning system of Wireless indoor Access Point have become very popular. These method have been used in many area like asset tracking, location fingerprinting and inventory management. The optimization of location of access point is to improve the accuracy of positioning due to complexity of indoor radio propagation environment. The first method introduce the indoor radio prop...

This paper describes the results of an ultrawideband (UWB) propagation study in which arrays of propagation measurements were made. After a description of the propagation measurement technique, an approach to the spatial and temporal decomposition of an array of measurements into wavefronts impinging on the receiving array is presented. Based on a modification of the CLEAN algorithm, this appro...

Vegetation is an indispensable feature of most outdoor wireless channel environments. The interaction between radio waves and vegetation has been researched for several decades. Because of the complex structure of the foliage, composed of randomly oriented trunks, branches, twigs and leaves, the involved physical process in the propagation of the radiowave through vegetation is complex. Accurat...

In this paper, a dual band planar inverted F antenna (PIFA) has been investigated for cooperative onand off-body communications. Free space and on-body performance parameters like return loss, bandwidth, radiation pattern and efficiency of this antenna are shown and investigated. The onand off-body radio propagation channel performance at 2.45 GHz and 1.9 GHz have been investigated, respectivel...

Underground mining tunnels constitute a very particular environment for radio wave propagation – with characteristics of both indoor and outdoor “regular” environments. This paper shows how a general-purpose WiFi-based indoor positioning system, OwlPS (Owl Positioning System) was adapted to work in that particular environment. A series of experiments, conducted in a formerly exploited gold mine...

For indoor Wireless Local Area Networks (WLANs) planning, an accurate propagation modelling is required. Semi-empirical models represent an efficient approach to the indoor channel coverage prediction. Their parameters are estimated from measurement results. In the case called ill-conditioned, the Least Square (LS) regression leads to a bad estimation of the model parameters and thus to numeric...

Two models for generating phase of individual multipath components in an indoor environment, partly developed in [1], have been studied in detail. In the deterministic phase increment model (model I), phase of each multipath component is updated deterministically using several independent random scatterers. In the random phase increment model (model II), phase of each multipath component is upd...

To implementation of mobile ad hoc network wave propagation models are necessary to determine propagation characteristic through a medium. Wireless mobile ad hoc networks are self creating and self organizing entity. Propagation study provides an estimation of signal characteristics. Accurate prediction of radio propagation behaviour for MANET is becoming a difficult task. This paper presents i...

The use of wideband 60 GHz radio propagation channel will allow high data rates in future communication systems [1]. E.g., the 57...64 GHz frequency band will allow Gbit data rates for short-range wireless access. Indeed this frequency range offers huge bandwidths and, due to the oxygen absorption, improves frequency reuse in cellular networks compared to lower frequencies. Furthermore, array s...