Research On Key Algorithms For High Speed Visible Light Communication

Visible light communication(VLC)has serval advantages including high emitting power,immumnity to electricmagnetic interference,high security,low propogation loss in underwater transmission and so on.Therefore,VLC has been considered as an important technology for next generation indoor wireless communication and high-speed underwater communication.This thesis mainly discusses advanced equalization technologies in VLC systems for indoor and underwater applications,in which we foucs on nonlinearity models of high accuracy in VLC systems and low-complexity,high performance nonlinear equalizers for different VLC systems.To begin with,this thesis introduces transmitters,channels and recievers in VLC systems,including the structures,spectrum and I-V characteristics of LEDs/LD and the principle of the recievers.Then some classic nonlinear models and nonlinear equalizers are presented.After that,the impact of nonlinearity on single carrier/multi-carrier VLC systems are discussed.Finally,three VLC nonlinear equalizers are proposed and experimentally investigated in indoor/underwater communication scenarios,which include:1)one low-complexity and high-performance frequency domain nonlinear equalizer,FD-NC,has been proposed and experimentally demonstrated for indoor wireless communication;2)one low-complexity and high-performance time domain nonlinear equalizer based on MP and OMP has been proposed and experimentally demonstrated for indoor wireless communication;3)the Volterra series based 3rd nonlinear equalizer is proposed and demonstrated in an underwater communication system.