Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling

Abstract Faster-than-Nyquist (FTN) signal achieves higher spectral efficiency and capacity compared to Nyquist signal due to its smaller pulse interval or narrower subcarrier spacing. Shannon limit typically defines the upper-limit capacity of Nyquist signal. To the best of our knowledge, the mathem...

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Autores principales:	Ji Zhou, Yaojun Qiao, Zhanyu Yang, Qixiang Cheng, Qi Wang, Mengqi Guo, Xizi Tang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2807806076314728b3043269caa775c4
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spelling	oai:doaj.org-article:2807806076314728b3043269caa775c42021-12-02T11:53:02ZCapacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling10.1038/s41598-017-03571-62045-2322https://doaj.org/article/2807806076314728b3043269caa775c42017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03571-6https://doaj.org/toc/2045-2322Abstract Faster-than-Nyquist (FTN) signal achieves higher spectral efficiency and capacity compared to Nyquist signal due to its smaller pulse interval or narrower subcarrier spacing. Shannon limit typically defines the upper-limit capacity of Nyquist signal. To the best of our knowledge, the mathematical expression for the capacity limit of FTN non-orthogonal frequency-division multiplexing (NOFDM) signal is first demonstrated in this paper. The mathematical expression shows that FTN NOFDM signal has the potential to achieve a higher capacity limit compared to Nyquist signal. In this paper, we demonstrate the principle of FTN NOFDM by taking fractional cosine transform-based NOFDM (FrCT-NOFDM) for instance. FrCT-NOFDM is first proposed and implemented by both simulation and experiment. When the bandwidth compression factor α is set to 0.8 in FrCT-NOFDM, the subcarrier spacing is equal to 40% of the symbol rate per subcarrier, thus the transmission rate is about 25% faster than Nyquist rate. FTN NOFDM with higher capacity would be promising in the future communication systems, especially in the bandwidth-limited applications.Ji ZhouYaojun QiaoZhanyu YangQixiang ChengQi WangMengqi GuoXizi TangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ji Zhou Yaojun Qiao Zhanyu Yang Qixiang Cheng Qi Wang Mengqi Guo Xizi Tang Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
description	Abstract Faster-than-Nyquist (FTN) signal achieves higher spectral efficiency and capacity compared to Nyquist signal due to its smaller pulse interval or narrower subcarrier spacing. Shannon limit typically defines the upper-limit capacity of Nyquist signal. To the best of our knowledge, the mathematical expression for the capacity limit of FTN non-orthogonal frequency-division multiplexing (NOFDM) signal is first demonstrated in this paper. The mathematical expression shows that FTN NOFDM signal has the potential to achieve a higher capacity limit compared to Nyquist signal. In this paper, we demonstrate the principle of FTN NOFDM by taking fractional cosine transform-based NOFDM (FrCT-NOFDM) for instance. FrCT-NOFDM is first proposed and implemented by both simulation and experiment. When the bandwidth compression factor α is set to 0.8 in FrCT-NOFDM, the subcarrier spacing is equal to 40% of the symbol rate per subcarrier, thus the transmission rate is about 25% faster than Nyquist rate. FTN NOFDM with higher capacity would be promising in the future communication systems, especially in the bandwidth-limited applications.
format	article
author	Ji Zhou Yaojun Qiao Zhanyu Yang Qixiang Cheng Qi Wang Mengqi Guo Xizi Tang
author_facet	Ji Zhou Yaojun Qiao Zhanyu Yang Qixiang Cheng Qi Wang Mengqi Guo Xizi Tang
author_sort	Ji Zhou
title	Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
title_short	Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
title_full	Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
title_fullStr	Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
title_full_unstemmed	Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling
title_sort	capacity limit for faster-than-nyquist non-orthogonal frequency-division multiplexing signaling
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2807806076314728b3043269caa775c4
work_keys_str_mv	AT jizhou capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT yaojunqiao capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT zhanyuyang capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT qixiangcheng capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT qiwang capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT mengqiguo capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling AT xizitang capacitylimitforfasterthannyquistnonorthogonalfrequencydivisionmultiplexingsignaling
_version_	1718394913341571072

Capacity limit for faster-than-Nyquist non-orthogonal frequency-division multiplexing signaling

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