visible light positioning systems under imperfect synchronization and signal-dependant noise
abstract
optical wireless communication (owc) is an enabling technology for sixth-generation
(6g) and beyond communication networks. visible light communication (vlc) is a
crucial branch of owc technology expected to meet 6g communication system requirements. the vlc system can facilitate multiple functionalities simultaneously including
illumination, ultra-high data rate communications, positioning such as location and
navigation services. in vlc systems, a light-emitting diode (led) functions as a transmitter. a photodetector or imaging sensor acts as a receiver and the visible light is used
as the transmission medium. researchers have shown a great deal of interest in vlc
based positing and localization techniques, as visible light positioning (vlp) systems
have shown better localization accuracy than radio frequency (rf) based positioning or
global positioning system (gps). this thesis considers the problem of position estimation accuracy in vlc systems in the presence of signal-dependent shot noise (sdsn).
we investigate distance and 3d position estimation approaches in different scenarios,
focusing on error estimation performance bounds. additionally, this work attempts to
resolve the synchronization problem found in vlp systems.