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Super-Mode OFDM with Index Modulation

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Document pages: 10 pages

Abstract: Orthogonal frequency division multiplexing (OFDM) with index modulation(OFDM-IM) appears as a promising multi-carrier waveform candidate for beyond 5Gdue to its attractive advantages such as operational flexibility and ease ofimplementation. However, OFDM-IM may not be a proper choice for 5G servicessuch as enhanced mobile broadband (eMBB) since achieving high data rates ischallenging because of its null subcarriers. One solution to enhance thespectral efficiency of OFDM-IM is the employment of multiple distinguishableconstellations (modes) by also exploiting its null subcarriers for datatransmission. This paper proposes a novel IM technique called super-modeOFDM-IM (SuM-OFDM-IM), where mode activation patterns (MAPs) and subcarrieractivation patterns (SAPs) are jointly selected and conventional data symbolsare repetition coded over multiple subcarriers to achieve a diversity gain. Forthe proposed scheme, a low-complexity detector is designed, theoreticalanalyses are performed and a bit error rate (BER) upper bound is derived. Theperformance of the proposed system is also investigated through real-timeexperiments using a software-defined radio (SDR) based prototype. We show thatSuM-OFDM-IM exhibits promising results in terms of spectral efficiency anderror performance; thus, appears as a potential candidate for 5G and beyondcommunication systems.

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