简介：Thispaperdiscussesthetime-of-arrival(TOA)basedindoorvisiblelightcommunication(VLC)positioningsysteminanon-line-of-sightenvironment.Thepropagationdelayisassumedtobegammadistributed.ThegeneralizedCramer–Raolowerboundformultipathpropagationisderivedasthetheoreticalaccuracylimitation.Theperformanceofthepositioningsystemisaffectedbytheshapeparameterandthescaleparameterofgammadistribution.Theinfluencesonpositioningaccuracyofmultipatheffectsareanalyzedthroughdiscussingthephysicalmeaningofthegammadistributionparameters.Itisconcludedthatthelowerboundofpositioningaccuracyisattainedwhenvarianceofthenon-line-of-sightpropagation-inducedpathlengthsiszero.Thesimulationresultprovesthatthetheoreticalpositioningaccuracyisintheorderofcentimeterswiththegivenscenario.