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In this communication, we propose a framework for amalgamatingoptical-orthogonal frequency-division multiplexing (O-OFDM) and O-OFDM withindex modulation (O-OFDM-IM) for optical wireless systems. Both schemesindividually have some limitations, e.g., O-OFDM does not provide anygranularity for spectral efficiency (SE)/energy efficiency (EE) trade-off, andO-OFDM-IM loses EE for higher order modulation alphabets. By combining O-OFDMand O-OFDM-IM together, the above limitations can be circumvented. Following onfrom providing the general framework, we use asymmetrically clipped (AC)O-OFDMand ACO-OFDM-IM to demonstrate the validity of the framework. The resultspresented herein establish that, by consolidating O-OFDM and O-OFDM-IM, inaddition to providing SE/EE trade-off, we may realise higher SE and outperformO-OFDM-IM in terms of EE for high SE.

A Framework for Amalgamating Optical-OFDM and Optical-OFDM with Index Modulation for Optical Wireless Systems