Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond

Computational complexity is one of the drawbacks of orthogonal frequency division multiplexing (OFDM)-index modulation (IM) systems. In this study, a novel IM technique is proposed for OFDM systems by considering the null subcarrier locations (NSC-OFDM-IM) within a predetermined group in the frequen...

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Autores principales:	Tuncay Eren, Aydin Akan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	OFDM index modulation null subcarrier computational complexity 6G and beyond Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/a78250d0ecba4afc97ea2e22a1b0bb00
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spelling	oai:doaj.org-article:a78250d0ecba4afc97ea2e22a1b0bb002021-11-11T19:13:30ZNull Subcarrier Index Modulation in OFDM Systems for 6G and Beyond10.3390/s212172631424-8220https://doaj.org/article/a78250d0ecba4afc97ea2e22a1b0bb002021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7263https://doaj.org/toc/1424-8220Computational complexity is one of the drawbacks of orthogonal frequency division multiplexing (OFDM)-index modulation (IM) systems. In this study, a novel IM technique is proposed for OFDM systems by considering the null subcarrier locations (NSC-OFDM-IM) within a predetermined group in the frequency domain. So far, a variety of index modulation techniques have been proposed for OFDM systems. However, they are almost always based on modulating the active subcarrier indices. We propose a novel index modulation technique by employing the part of the transmitted bit group into the null subcarrier location index within the predefined size of the subgroup. The novelty comes from modulating null subcarriers rather than actives and reducing the computational complexity of the index selection and index detection algorithms at the transmitter and receiver, respectively. The proposed method is physically straightforward and easy to implement owing to the size of the subgroups, which is defined as a power of two. Based on the results of our simulations, it appeared that the proposed NSC-OFDM-IM does not suffer from any performance degradation compared to the existing OFDM-IM, while achieving better bit error rate (BER) performance and improved spectral efficiency (SE) compared to conventional OFDM. Moreover, in terms of computational complexity, the proposed approach has a significantly reduced complexity over the traditional OFDM-IM scheme.Tuncay ErenAydin AkanMDPI AGarticleOFDMindex modulationnull subcarriercomputational complexity6G and beyondChemical technologyTP1-1185ENSensors, Vol 21, Iss 7263, p 7263 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	OFDM index modulation null subcarrier computational complexity 6G and beyond Chemical technology TP1-1185
spellingShingle	OFDM index modulation null subcarrier computational complexity 6G and beyond Chemical technology TP1-1185 Tuncay Eren Aydin Akan Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
description	Computational complexity is one of the drawbacks of orthogonal frequency division multiplexing (OFDM)-index modulation (IM) systems. In this study, a novel IM technique is proposed for OFDM systems by considering the null subcarrier locations (NSC-OFDM-IM) within a predetermined group in the frequency domain. So far, a variety of index modulation techniques have been proposed for OFDM systems. However, they are almost always based on modulating the active subcarrier indices. We propose a novel index modulation technique by employing the part of the transmitted bit group into the null subcarrier location index within the predefined size of the subgroup. The novelty comes from modulating null subcarriers rather than actives and reducing the computational complexity of the index selection and index detection algorithms at the transmitter and receiver, respectively. The proposed method is physically straightforward and easy to implement owing to the size of the subgroups, which is defined as a power of two. Based on the results of our simulations, it appeared that the proposed NSC-OFDM-IM does not suffer from any performance degradation compared to the existing OFDM-IM, while achieving better bit error rate (BER) performance and improved spectral efficiency (SE) compared to conventional OFDM. Moreover, in terms of computational complexity, the proposed approach has a significantly reduced complexity over the traditional OFDM-IM scheme.
format	article
author	Tuncay Eren Aydin Akan
author_facet	Tuncay Eren Aydin Akan
author_sort	Tuncay Eren
title	Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
title_short	Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
title_full	Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
title_fullStr	Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
title_full_unstemmed	Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
title_sort	null subcarrier index modulation in ofdm systems for 6g and beyond
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a78250d0ecba4afc97ea2e22a1b0bb00
work_keys_str_mv	AT tuncayeren nullsubcarrierindexmodulationinofdmsystemsfor6gandbeyond AT aydinakan nullsubcarrierindexmodulationinofdmsystemsfor6gandbeyond
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Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond

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