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Novel Modulation Technology for 6G Communications
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Novel Modulation Technology for 6G Communications

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

Deadline for manuscript submissions: closed (15 July 2023) | Viewed by 6590

Special Issue Editors

Dr. Jun Li

E-Mail Website
Guest Editor
School of Electronics and Communication Engineering, Guangzhou University, Guangzhou 510006, China
Interests: spatial modulation; OFDM with index modulation; reconfigurable intelligent surface
Special Issues, Collections and Topics in MDPI journals
Dr. Xueqin Jiang

E-Mail Website
Guest Editor
School of Information Science and Technology, Donghua University, Shanghai, China
Interests: error correction coding theory; MIMO; quantum key distribution
Special Issues, Collections and Topics in MDPI journals
Dr. Yuyang Peng

E-Mail Website
Guest Editor
Faculty of Information Technology, Macau University of Science and Technology, Macau SAR, China
Interests: cooperative communications; spatial modulation; communication security; wireless sensor networks

Special Issue Information

Dear Colleagues,

The past decade has witnessed tremendous increases in data throughput and the number of connected nodes, and recent studies have also predicted these increases in next-generation networks. These tremendous increases will undoubtedly result in increasingly stringent requirements for spectral efficiency and energy efficiency. In terms of meeting these two requirements, in recent years, novel modulation techniques, such as index modulation, media-based modulation, RIS-based/reflecting modulation, OTFS, and subcarrier number modulation, has attracted researchers’ attention. Different from conventional amplitude-phase modulation schemes, novel modulation employs one or more modulation dimension(s) in addition to a classic amplitude-phase constellation diagram to form a higher-dimensional modulation scheme, which considerably enhances spectral efficiency under proper system configurations.

In the use of novel modulation technology, only a subset of media resources or functional blocks will be activated to form a unique activation pattern. Consequently, the activation pattern per se can be used to modulate an extra bit stream in addition to the bit stream modulated by data constellation symbols. As a paradigm in its infancy, there are still a large number of open research questions awaiting solutions, and further research is highly important so that novel modulation can finally advance to the practical implementation stage. Apart from theoretical research, concerns regarding its practical implementation need to be addressed.

In light of the aforementioned advantages of applying novel modulation in 6G communications and the remaining research problems, this feature topic aims to bring together leading researchers in both academia and industry from diversified backgrounds with original and high-quality publications that address the theoretical and practical issues related to the novel modulation concept. Extended versions of papers published in conferences, symposiums, or workshop proceedings are encouraged to be submitted for consideration.

Topics of interests include, but are not limited to, the following:

  • Artificial-intelligence- and learning-technique-assisted novel modulation technology;
  • Massive MIMO and reconfigurable intelligent surface (RIS)-assisted novel modulation technology;
  • Novel modulation technology in millimeter-wave, terahertz, and optical wireless communications and novel modulation technology for underwater optical/acoustic communications;
  • Novel modulation technology with high mobility and physical security and secrecy-related issues of novel modulation technology;
  • Novel modulation technology in multi-user and cooperative relay networks and performance analyses for novel modulation-technology-based communication systems;
  • Resource allocation and optimization for novel modulation-technology-based communication systems;
  • Detection and transceiver designs for novel modulation technology.

Dr. Jun Li
Dr. Xueqin Jiang
Dr. Yuyang Peng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • modulation
  • channel estimation
  • index modulation
  • media-based modulation
  • RIS
  • OTFS
  • subcarrier number modulation

Published Papers (4 papers)

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Research

21 pages, 2179 KiB  
Article
Modulation, Shaping and Replicability of UWB Chaotic Radiopulses for Wireless Sensor Applications
by Lev V. Kuzmin, Elena V. Efremova and Vadim V. Itskov
Sensors 2023, 23(15), 6864; https://doi.org/10.3390/s23156864 - 02 Aug 2023
Cited by 2 | Viewed by 805
Abstract
A modulation method is proposed for generating identical UWB chaotic radio pulses using an analog generator of chaotic oscillations. The problem is on the edge of two contradicting requirements: (1) theoretical ability to produce a huge number of various-shape signals, because of high [...] Read more.
A modulation method is proposed for generating identical UWB chaotic radio pulses using an analog generator of chaotic oscillations. The problem is on the edge of two contradicting requirements: (1) theoretical ability to produce a huge number of various-shape signals, because of high sensitivity to the initial conditions of the generator; (2) the necessity to reproduce oscillations of the same shape both in the receiver and in the transmitter for the implementation of coherent methods of signal processing. The considered method allows us to resolve this contradiction. A single-transistor chaotic oscillator with single power supply and frequency range 100 to 500 MHz is proposed. A mathematical model of the generator (a system of ODEs) was derived. A method of generating chaotic radio pulses with a reproducible shape that could be varied in a manner that is controlled and natural for UWB radio by means of changing the supply voltage of the chaotic oscillator is shown. The mathematical model of the generator is simulated numerically and proves the proposed ideas. The shaping and the replicability of UWB pulses was experimentally proven in an analog domain on a testbed with four instances of the chaotic generator. Full article
(This article belongs to the Special Issue Novel Modulation Technology for 6G Communications)
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16 pages, 849 KiB  
Article
RIS-Assisted Hybrid Beamforming and Connected User Vehicle Localization for Millimeter Wave MIMO Systems
by Md. Abdul Latif Sarker, Woosung Son and Dong Seog Han
Sensors 2023, 23(7), 3713; https://doi.org/10.3390/s23073713 - 03 Apr 2023
Cited by 1 | Viewed by 2080
Abstract
A reconfigurable intelligent surface (RIS) is a type of metasurface that can dynamically control the reflection and transmission of electromagnetic waves, such as radio waves, by changing its physical properties. Recently, RISs have played an important role in intelligently reshaping wireless propagation environments [...] Read more.
A reconfigurable intelligent surface (RIS) is a type of metasurface that can dynamically control the reflection and transmission of electromagnetic waves, such as radio waves, by changing its physical properties. Recently, RISs have played an important role in intelligently reshaping wireless propagation environments to improve the received signal gain as well as spectral efficiency performance. In this paper, we consider a millimeter wave (mmWave) vehicle-to-vehicle (V2V) multiple-input multiple-output (MIMO) system in which, an RIS is deployed to aid downlink V2V data transmission. In particular, the line-of-sight path of the mmWave system is affected by blockages, resulting in higher signaling overhead. Thus, the system performance may suffer due to interruptions caused by static or mobile blockers, such as buildings, trees, vehicles, and pedestrians. In this paper, we propose an RIS-assisted hybrid beamforming scheme for blockage-aware mmWave V2V MIMO systems to increase communication service coverage. First, we propose a conjugate gradient and location-based hybrid beamforming (CG-LHB) algorithm to solve the user sub-rate maximization problem. We then propose a double-step iterative algorithm that utilizes an error covariance matrix splitting method to minimize the effect of location error on the passive beamforming. The proposed algorithms perform quite well when the channel uncertainty is smaller than 10%. Finally, the simulation results validate the proposed CG-LHB algorithm in terms of the RIS-assisted equivalent channel for mmWave V2V MIMO communications. Full article
(This article belongs to the Special Issue Novel Modulation Technology for 6G Communications)
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11 pages, 8857 KiB  
Communication
BICM-ID Labeling-Based Recipient Identification in a Heterogeneous Network
by Maciej Krasicki
Sensors 2023, 23(7), 3605; https://doi.org/10.3390/s23073605 - 30 Mar 2023
Cited by 2 | Viewed by 807
Abstract
The concept of labeling-based recipient identification (LABRID) for bit-interleaved coded modulation with iterative decoding (BICM-ID) is revisited. LABRID allows addressing a message recipient station in a wireless network by using an individual labeling map without compromising error performance. This eliminates the need to [...] Read more.
The concept of labeling-based recipient identification (LABRID) for bit-interleaved coded modulation with iterative decoding (BICM-ID) is revisited. LABRID allows addressing a message recipient station in a wireless network by using an individual labeling map without compromising error performance. This eliminates the need to use any byte of the data frame to carry the recipient address explicitly. In addition, the destination of the frame can be determined in parallel with a BICM-ID decoding procedure in the receiver’s physical layer. Therefore, the MAC layer is not involved in processing the vast majority of frames transmitted in a network. Previously, it was shown that LABRID works fine if there are only LABRID-compatible stations within the network, and every receiver can reject frames destined for other receivers. This paper considers a scenario in which LABRID-compatible BICM-ID stations and legacy BICM stations coexist in the same network. A few experiments show that the LABRID receiver can reject an old-fashioned BICM frame by judging the convergence of the iterative decoding process. It also turns out that the legacy BICM receiver can identify and dismiss the LABRID-type frames thanks to the standard cyclic redundancy check (CRC) procedure. Full article
(This article belongs to the Special Issue Novel Modulation Technology for 6G Communications)
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16 pages, 6845 KiB  
Article
Modulation Recognition of Communication Signals Based on Multimodal Feature Fusion
by Xinliang Zhang, Tianyun Li, Pei Gong, Renwei Liu and Xiong Zha
Sensors 2022, 22(17), 6539; https://doi.org/10.3390/s22176539 - 30 Aug 2022
Cited by 7 | Viewed by 1776
Abstract
Modulation recognition is the indispensable part of signal interception analysis, which has always been the research hotspot in the field of radio communication. With the increasing complexity of the electromagnetic spectrum environment, interference in signal propagation becomes more and more serious. This paper [...] Read more.
Modulation recognition is the indispensable part of signal interception analysis, which has always been the research hotspot in the field of radio communication. With the increasing complexity of the electromagnetic spectrum environment, interference in signal propagation becomes more and more serious. This paper proposes a modulation recognition scheme based on multimodal feature fusion, which attempts to improve the performance of modulation recognition under different channels. Firstly, different time- and frequency-domain features are extracted as the network input in the signal preprocessing stage. The residual shrinkage building unit with channel-wise thresholds (RSBU-CW) was used to construct deep convolutional neural networks to extract spatial features, which interact with time features extracted by LSTM in pairs to increase the diversity of the features. Finally, the PNN model was adapted to make the features extracted from the network cross-fused to enhance the complementarity between features. The simulation results indicated that the proposed scheme has better recognition performance than the existing feature fusion schemes, and it can also achieve good recognition performance in multipath fading channels. The test results of the public dataset, RadioML2018.01A, showed that recognition accuracy exceeds 95% when the signal-to-noise ratio (SNR) reaches 8dB. Full article
(This article belongs to the Special Issue Novel Modulation Technology for 6G Communications)
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