1 research outputs found
Analysis of Indoor Uplink Optical Communication Positioning System Exploiting Multipath Reflections
In this paper, we introduce an uplink optical wireless positioning system for
indoor applications. This technique uses fingerprints based on the indoor
optical wireless channel impulse response for localization. Exploiting the line
of sight peak power (LOS), the second power peak (SPP) of the impulse response,
and the delay between the LOS and SPP, we present a proof of concept design and
theoretical analysis for localization employing a single fixed reference point,
i.e., a photodetector (PD) on the ceiling. Adding more PDs leads to more
accurate transmitter position estimation. As a benchmark, we present analytical
expressions of the Cramer-Rao lower bound (CRLB) for different numbers of PDs
and features. We further present closed form analytical approximations for the
chosen features of the channel impulse response. Simulation results show a root
mean square (RMS) positioning accuracy of 25\,cm and 5\,cm for one and four
PDs, respectively, for a typical indoor room at high SNR. Numerical results
verify that the derived analytic approximations closely match the simulations.Comment: 9 pages, 13 figure