OFDM Index Modulation Technique

Silong Zhao

Article ID: 10157
Vol 7, Issue 10, 2024

VIEWS - 12 (Abstract)

Abstract


This paper discusses two innovative schemes for orthogonal frequency division multiplexing (OFDM): indexed modulated OFDM
(OFDM-IM) and dual-mode dual-indexed OFDM-IM (DMDI-OFDM-IM). The aim is to improve spectral efficiency and error performance
under frequency-selective and fast time-varying fading channels. The OFDM-IM scheme de- livers information through the indexing of
activated subcarriers beyond the multiple signal constellations in conventional OFDM. This paper briefs outline a low-complexity transceiver archi- tecture for OFDM-IM based on maximum likelihood detection and log-likelihood ratio computation. A brief analysis of the error
performance of conventional OFDM and DM-OFDM-IM is presented. The DMDI-OFDM-IM scheme provides additional information transmission through dual indexing by relocating symbols and selecting relocation vectors in active subcarriers, as well as utilizing inactive subcarriers, resulting in improved frequency performance. Thus, higher spectral efficiency can be achieved. And there is evidence of significant
improvement in the error performance of both schemes compared to conventional OFDM under different channel conditions, confirming their
potential application in efficient wireless communication systems. Index Terms—DM OFDM-IM, Error Performance, Fad- ing Channels,
Index Modulation, Low-Complexity Transceiver DesignOFDM-IM, Orthogonal Frequency Division Multiplexing (OFDM), Spectral Efficiency

Keywords


DM OFDM-IM; Error Performance; Fading Channels; Index Modulation; Low-Complexity Transceiver Design OFDM-IM; Orthogonal Frequency Division Multiplexing (OFDM); Spectral Efficiency

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DOI: https://doi.org/10.18686/ijmss.v7i10.10157

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