OFDM and Generalized LED Based on Index Modulation for Optical MIMO System

초록

Orthogonal?? frequency?? division?? multiplexing?? with?? index??modulation??(OFDMIM) ??is??an??extension??of?? the??traditional?? OFDM??modulation??scheme.??Its??key??idea??is??to??adopt??the??activated?? subcarrier?? index?? to?? carry?? extra?? information.?? In?? this?? paper,?? we?? propose??a??new??optical??multiinput ??multipleoutput ??(MIMO)??visible?? light?? communication?? (VLC)?? system?? based?? on?? OFDMIM ?? and?? generalized??lightemitting ??diode??(LED)??index??modulation??(GLIM).?? The?? proposed?? scheme?? utilizes?? the?? subcarrier?? index?? selection?? to?? improve?? the?? system?? flexibility?? and?? adopts?? the?? LED?? index?? modulation??to??increase??the??spectral??efficiency,??which??also??avoids?? the??Hermitian??symmetry??processing.??Simulation??results??show??that?? the?? proposed?? scheme?? achieves?? better?? bit?? error?? rate?? (BER)?? performance?? than?? the?? traditional?? GLIM?? scheme.?? Moreover,?? the?? proposed?? scheme?? can?? flexibly?? select?? the?? number?? of?? the?? active?? subcarriers??according??to??the??channel??condition??and??ensure??better?? system??performance.??