Generalized Time Slot Index Modulation for Optical Wireless Communications

Ardimas Purwita, Anil Yesilkaya, Majid Safari, Harald Haas

Research output: Contribution to journalArticlepeer-review


A novel modulation scheme for an indoor optical wireless communication (OWC) system referred to as generalized time slot index modulation (GTIM) is proposed for single-carrier frequency domain equalization (SC-FDE) systems. This scheme
is further referred to as SC-GTIM. In SC-GTIM, information bits are flexibly encoded onto both the amplitudes and positions of pulses. A set partitioning algorithm is proposed to construct a codebook for the SC-GTIM system. In this paper, SC-GTIM will be compared with the conventional pulse amplitude modulationbased SC-FDE (SC-PAM) and time slot index modulation-based
SC-FDE (SC-TIM). By considering a multipath optical wireless channel and the limited dynamic range of a light emitting diode (LED), a considerable bit error ratio (BER) gain can be achieved by SC-GTIM. It is concluded that SC-GTIM is a promising technique for low to medium spectral efficiency transmission and
uplink schemes.
Original languageEnglish
JournalIEEE Transactions on Communications
Publication statusPublished - 10 Mar 2020


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