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Modified CI and Modulation Order Replacement for Enhancing OFDM-IM Performance
Published in Institute of Electrical and Electronics Engineers Inc.
Volume: 13
Issue: 6
Pages: 1286 - 1300
Recently, a lower order modulation aided bit error rate reduction scheme was proposed for orthogonal frequency division multiplexing with index modulation (OFDM-IM). Here, the key idea was to replace the conventional modulation order in OFDM-IM with a lower order modulation and its rotated versions. In this paper, we incorporate on the aforementioned system, a novel coordinate interleaving (CI) scheme, where instead of the conventional application of CI to the data symbols alone, it is applied to the entire sub-block containing data symbols and zero-padded sub-carriers. Also, we replace the conventional modulation order in OFDM-IM with a higher order signal constellation. This leads to an increase in the number of symbol selecting bits and a subsequent decrease in the number of index combinations required for mapping. Next, the resulting excess inactive sub-carriers are used to carry more copies of the same data symbols in order to provide diversity. Finally, this modulation order replacement scheme is extended to the in-phase quadrature variant of OFDM-IM. Numerical results indicate that up to 7-dB transmit power gains over OFDM-IM and also over the existing lower order constellation aided scheme can be accrued. © 2019 IEEE.
About the journal
JournalData powered by TypesetIEEE Journal on Selected Topics in Signal Processing
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open AccessNo
Concepts (8)
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    Bit error rate
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    Orthogonal frequency division multiplexing
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    Spectral efficiencies
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