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This paper presents analysis of antenna diversity impact to distance measurement error of indoor TOA-based positioning systems. First channel impulse response shaping methods and indoor TOA-based systems accuracy aspects are shortly discussed. In the following part of the paper obtained results for two types of data (ray-tracing simulations, measurements) and for various TOA detection techniques are...
This paper concerns a statistical modelling of wideband radio propagation channel in an indoor environment. An approach of describing amplitudes and excess delays of particular multipath components by means of probability density functions (PDF) was developed. Analysed channel impulse response (CIR) realizations were obtained from frequency-domain measurements carried out in a large laboratory hall.
The paper presents analysis of dependence of distance determination error in localization system based on time of arrival (TOA) measurements, on beam width of antenna radiation pattern. Using narrow beam antennas some multipath components with small delays, causing errors of calculation of distance between antennas, can be eliminated and accuracy of the system can be increased. Analysis bases on results...
This paper presents results of investigation concerning method for decreasing errors of TOA based indoor wireless positioning systems caused by multipath components. Presented method is based on directional antennas with small side lobes level. Additionally, for attenuation some of multipath components arriving from LOS direction circular polarization antennas are analyzed. The paper describes typical...
This paper presents results of investigation concerning method for decreasing errors of TOA based indoor wireless positioning systems caused by multipath components. Presented method is based on directional antennas with small side lobes level. Additionally, for attenuation some of multipath components arriving from LOS direction circular polarization antennas are analyzed. The paper describes typical...
The paper presents measurements results of the propagation channel for three types of indoor environments. Basing on these results statistical analysis and comparison of obtained data are presented. Short review of channel profile measurement techniques are also presented. The paper includes discussion of indoor channel propagation type influence on positioning systems accuracy. Measurements were...
Paper presents a proposal of method for closely spaced paths mitigation for indoor location system based on spread spectrum signals. At the beginning issue of closely spaced paths influence for the accuracy of TO A determination is explained. In the following part results of indoor propagation simulations are presented. These simulations show relationship between delays and directions of arrival of...
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