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Special Issue "Flexible Radio Access Techniques for 5G and Beyond"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Communications".

Deadline for manuscript submissions: closed (10 October 2021) | Viewed by 4735

Special Issue Editor

Department of Electrical Engineering, University of South Florida, Tampa, FL 33620, USA
Interests: wireless communications; PHY and MAC design for 5G and beyond; millimeterwave communications; OFDM and beyond; PHY security; cognitive radio; dynamic spectrum access; multicarrier waveform design for 5G and beyond

Special Issue Information

Dear Colleagues,

Today's wireless services and systems have come a long way since the rollout of conventional voice-centric cellular systems. The demand for wireless access in voice and multimedia applications has increased tremendously. In addition to these, new application classes such as extreme mobile broadband communication, ultrareliable and low-latency communications, massive machine-type communications, and Internet of Things have gained significant interest recently for 5G. The trend on the variety and number of mobile devices along with mobile applications will certainly continue beyond 5G, creating a wide range of technical challenges, such as cost, power efficiency, spectrum efficiency, extreme reliability, low latency, robustness against diverse channel conditions, cooperative networking capability and coexistence, and dynamic and flexible utilization of a wireless spectrum. In order to address these technical challenges, 5G waveforms and radio access technologies (RATs) should be much more flexible.

During the standardization of 5G, one thing has become certain: there is no single enabling technology that can achieve all of the applications being promised by 5G networking. This will be even more pronounced beyond 5G. Based on the recent trend, it is anticipated that the quantity of wireless devices, applications, and heterogeneity of user requirements will keep increasing in the coming decade(s); however, the sufficiency of the current flexibility level remains quite disputable considering future expectations. Therefore, novel RATs facilitating much more flexibility are needed to address the aforementioned technical problems.

Prof. Dr. Huseyin Arslan
Guest Editor

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  • Flexible band utilization, dynamic spectrum sharing
  • Flexible and adaptable PHY and MAC
  • Integrated sensing and communication
  • Cognitive radios and networks
  • Flexibility in secure communication, PHY and MAC security
  • Heterogeneous networks
  • Flexible waveforms and coexistence
  • Enhanced scheduling
  • Channel adaptation and intelligent reflecting surfaces

Published Papers (1 paper)

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Null Subcarrier Index Modulation in OFDM Systems for 6G and Beyond
Sensors 2021, 21(21), 7263; - 31 Oct 2021
Cited by 3 | Viewed by 3762
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. [...] Read more.
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. Full article
(This article belongs to the Special Issue Flexible Radio Access Techniques for 5G and Beyond)
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