3D indoor floor localization based on WiFi and PDR

A layered indoor 3D positioning technology based on WiFi positioning and Pedestrian Dead Reckoning (PDR) is proposed to solve the problem that the pedestrian can only get coordinates in the 2D plane and low accuracy of current indoor localization from intelligent terminal. In the PDR location, the pedestrian's horizontal walking or taking up-down stairs can be distinguished by detecting the pitch-rate mutation. Height change of the pedestrian is obtained by using the effective steps and stairs information. The equations of the two different behavior patterns are constructed and three-dimensional PDR is realized. In the part of the filter, a particle filter algorithm combining WiFi, PDR, building information and behavior patterns is proposed. By fusing the building information and behavior models into the weight calculation and the sampling of the particle, the localization precision is effectively improved. The results show that the average error of the horizontal location is 2.6m and the average error of the height estimation is 1.1m, which satisfies the demand of the individual intelligent terminal for the location service, with the elevation parameter enabling the user to recognize floor information.     

High Capacity Data Rate System: Review of Visible Light Communications Technology

Wireless communications have become an integral part of global convergence as global connectedness has gradually become dependent on its efficient deployment. The need for “more-broadband” techniques in relation to the ever increasing growth rate of the data hungry society now necessitates novel techniques for the high-speed data transmission. While advancements have been made in this regard, the projection of having an eventual Internet of everything (IoE) deployment will result in an unimaginable transmission data rate requirement as huge data traffic will be conveyed per time within the communications network, which will require a capacity upgrade of the existing infrastructure. Visible light communications (VLCs), as an integral part of optical wireless communications (OWCs), have been reviewed in this article, having the capacity to extend the achievable data rate requirement of the wireless communications network. The technologies, techniques, and best practices have been presented alongside technology integration for the seamless high capacity wireless broadband deployment.