Title :
Performance of indoor visible light systems using OOK and PPM modulations under multipath channels
Author :
Nan Wu ; Xudong Wang ; Hao Dai
Author_Institution :
Dalian Maritime Univ., Dalian, China
Abstract :
In this paper, the performances of On-Off Keying (OOK) and Pulse Position Modulation (PPM) modulation schemes in multipath indoor optical wireless links are investigated. It is shown that PPM is more resilient to Inter-Symbol Interference (ISI) induced by multipath channels when one array of Light Emitting Diode (LED) transmitters is employed compared with OOK schemes. However, the OOK arrangement is capable of outperforming the PPM counterpart in a highly diffused channel. More explicitly, the effect of ISI on BER performance fundamentally determined by the interplay of the delay spread of the indoor wireless channel and the duration of one transmission symbol, which is captured by `normalized delay spread´. Finally, numerous simulation results were provided in order to demonstrate the system performance under various normalized delay spreads.
Keywords :
amplitude shift keying; error statistics; indoor communication; intersymbol interference; light emitting diodes; multipath channels; optical links; optical modulation; optical transmitters; pulse position modulation; BER performance; ISI; LED transmitters; OOK modulations; PPM modulations; indoor visible light systems; indoor wireless channel; inter-symbol interference; light emitting diode transmitters; multipath channels; multipath indoor optical wireless links; normalized delay spread; on-off keying modulation schemes; pulse position modulation schemes; transmission symbol; Bit error rate; Delays; Light emitting diodes; Modulation; Optical filters; Optical transmitters; Wireless communication; Multipath performance; OOK; PPM; VLC;
Conference_Titel :
Optical Wireless Communications (IWOW), 2013 2nd International Workshop on
Conference_Location :
Newcastle upon Tyne
DOI :
10.1109/IWOW.2013.6777783
