Abstract
In this paper, a new spectrally efficient space modulation technique, which is called double quadrature spatial intensity modulation (DQSIM), is proposed for multiple-input multiple-output (MIMO) visible light communication (VLC) systems. Sub-carrier intensity modulation (SIM), which ensures the use of in-phase/quadrature (I/Q) signals in intensity modulation direct detection (IM/DD) systems, is used as a digital modulation scheme. In RF, quadrature spatial modulation (QSM) transmits the I/Q signals through single or multiple antennas selected independently from each other. Furthermore, the orthogonality between I and Q components is provided for the half period of sinusoids. DQSIM utilizes these two features and transmits four fold more bits than spatial modulation (SM) via spatial constellation. SIM uses two-fold bandwidth compared to on-off keying (OOK), while DQSIM uses three fold. DQSIM outperforms benchmark modulation schemes, which are SIM-SM and PAM-SM, at the BER value of 10 -4 . Furthermore, DQSIM performance has increased with increasing number of LEDs.
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