Filtered Asymmetrically Clipped Optical-OFDM With Index Modulation for Optical Wireless Systems

In this letter, we present filtered asymmetrically clipped optical-orthogonal frequency-division multiplexing with index modulation (FACO-OFDM-IM) for optical wireless systems. FACO-OFDM-IM optimizes the baseband bandwidth by filtering out-of-band spectral leakage caused by clipping. Additionally, IM enables FACO-OFDM-IM to impart granularity for spectral efficiency (SE)/energy efficiency (EE) trade-off and to achieve higher SE over established counterparts. Hereby, we elucidate the transceiver architecture, SE/EE trade-off, and bit-error-rate (BER). Simulation results establish that FACO-OFDM-IM attains higher spectral efficiences than classical IM approaches and outperforms them for low alphabet cardinalities while marginally increasing the complexity.