In　this　work,　we　propose　a　multiple　inputs　multiple　outputs　(MIMO)　non-line-of-sight　(NLOS)　optical　camera　communication　(OCC)　system　with　multi-level　pulse　width　modulation　(MPWM)　and　difference-based　pulse　width　recognition　(DBPWR)　schemes.　The　MPWM　signals　transmitted　over　a　NLOS　link　are　recovered　using　the　DBPWR　algorithm.　Compared　with　the　conventional　threshold-based　demodulation　scheme,　the　proposed　DBPWR　scheme　has　lower　complexity,　higher　reliability,　and　improved　sampling　frequency　offset　tolerance.　A　total　data　rate　of　3.6　kb/s　is　experimentally　demonstrated　for　more　than　2　m　NLOS　link　using　the　proposed　MIMO　OCC　system,　which　is　sufficient　in　many　Internet　of　things　applications.　©　2022　IEEE.