Flexible LED Index Modulation for MIMO Optical Wireless Communications

Anil Yesilkaya, Ardimas Andi Purwita, Erdal Panayirci, H. Vincent Poor, Harald Haas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


The limited bandwidth of optical wireless communication (OWC) front-end devices motivates the use of multipleinput- multiple-output (MIMO) techniques to enhance data rates. It is known that very high multiplexing gains can be achieved by spatial multiplexing (SMX) at the cost of prohibitive detection complexity. Alternatively, in spatial modulation (SM), a single light emitting diode (LED) is activated per time instance where information is carried by both the signal and the LED index. Since only one LED is active, both the transmitter (TX) and receiver (RX) complexity reduce significantly while retaining the information transmission in the spatial domain. However, this simplified TX utilization approach leads SM to suffer from significant spectral efficiency losses compared to SMX. In this paper, we propose a technique that benefits from the advantages of both systems. Accordingly, the proposed flexible LED index modulation (FLIM) technique harnesses the inactive state of the LEDs as a transmit symbol. Therefore, the number of active LEDs changes in each transmission, unlike conventional techniques. Moreover, the system complexity is reduced by employing a linear minimum mean squared error (MMSE) equalizer and an angle perturbed receiver. Numerical results show that FLIM outperforms the reference systems by at least 6 dB in the low and medium/high spectral efficiency regions.
Original languageEnglish (US)
Title of host publicationGLOBECOM 2020 - 2020 IEEE Global Communications Conference
ISBN (Print)9781728182988
StatePublished - Dec 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2021-04-20
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2958-02
Acknowledgements: This work was supported by EPSRC under Established Career Fellowship Grant EP/R007101/1. This work was also supported in part by the Scientific and Technical Research Council of Turkey (TUBITAK) under the 1003- Priority Areas R&D Projects support Program No. 218E034 and KAUST under Grant No. OSR-2016-CRG5-2958-02. A. Yesilkaya acknowledges the financial support from Zodiac Inflight Innovations (TriaGnoSys GmbH). A. A. Purwita acknowledges the financial support from Indonesian Endowment Fund for Education (LPDP). H. Haas acknowledges support from the Wolfson Foundation and the Royal Society.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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