Indoor positioning remains an open problem, because it is difficult to achieve satisfactory accuracy within an indoor environment using current radio-based localization technology. In this study, we investigate the use of Indoor Messaging System (IMES) radio for high-accuracy indoor positioning. A hybrid positioning method combining IMES radio strength information and pedestrian dead reckoning ...

The characteristics of the propagation in indoor environments at a carrier frequency of 24 GHz are investigated by means of wideband directional measurements. The data shows that indoor radio propagation is dominated by impinging waves that exhibit discrete character. Furthermore, a global characterization of the investigated radio environment suitable for stochastic channel modeling by means o...

In indoor wireless communications systems, the antenna radiation patterns at the transmitter and the receiver have a significant influence on the channel characteristics. The work reported in this paper give insight about a new approach for modeling the effects of the radiation patterns of the directional horn antenna. The propagation modeling of the indoor multipath channel is based on the ray...

In this report, we propose a modification of the multi-resolution frequency domain ParFlow (MR-FDPF) method that allows simulating radio propagation channels in a frequency range. The performance of the proposed MR-FDPF implementation has been analyzed based on different realistic propagation scenarios. Key-words: ParFlow, TLM, wave propagation, indoor radio propagation, channel simulation, mul...

Ray-optical propagation models are often utilized for the prediction of the field strength (and delay spread) in mobile radio networks. However, the practical usage of these deterministic models is limited due to their high computational demands. A new method for the acceleration of ray-optical models is presented in this paper. It is based on a single preprocessing of the database in which the...

Ray optical modeling of wave propagation is often used for the prediction of the field strength (and delay spread) in wireless mobile communication networks. However, the practical use of these deterministic models is limited due to their high computational demands. For large areas in urban or indoor scenarios the computation times are in the range of hours which is too long for the planning of...

Abstract This paper discusses indoor WLAN DSSS radio range testing relating antenna type, radiated power, and transmitter/receiver separation to the IEEE 802.11 compliance range at the 2.4 GHz ISM band frequencies. Indoor range performance is shown to depend not only on transmit power and transmission rate, but on the product’s response to multipath and obstructions in the environment along the...

The relationship between behaviour of radio wave propagation and building architecture in a small indoor environment is examined. A site is divided into three partitions on the basis of number of walls between transmitter and receiver. Wideband radio propagation measurements are performed in each partition and the data analysed to compare channel characteristics in the partitions. Comparisons i...

Systems for indoor positioning using radio technologies are largely studied due to their convenience and the market opportunities they offer. The positioning algorithms typically derive geographic coordinates from observed radio signals and hence good understanding of the indoor radio channel is required. In this paper we investigate several factors that affect signal propagation indoors for bo...