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Non-Orthogonal Multi-User Transmissions for 5G Networks
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Non-Orthogonal Multi-User Transmissions for 5G Networks

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

Deadline for manuscript submissions: closed (31 May 2018) | Viewed by 25793

Special Issue Editor

Prof. Dr. Francesco Verde

E-Mail Website
Guest Editor
Department of Electrical Engineering and Information Technology, University Federico II, 80138 Naples, Italy
Interests: signal processing for communications; wireless communications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

To overcome the imminent radio frequency spectrum crunch, next-generation (5G and beyond) wireless networks must reach unprecedented levels of spectral efficiency. While existing wireless transmissions in licensed spectrum are built to be almost immune from any kind of external interference, the cost of the associated bandwidth is very high. On the other hand, transmitting in unlicensed spectrum portions is an affordable alternative, but the design has to deal with the problem of the interference generated to/from other systems. One possible solution for bringing down the cost per Hertz of licensed transmissions is the use of non-orthogonal multiple access (NOMA), which multiplexes licensed users in power and/or code domains. On the other hand, a clever combination of cooperation and non-orthogonal cognitive radio (NOCR) approaches allows unlicensed users to superimpose their transmissions on licensed signals, by maintaining or even improving the performance of licensed networks. NOMA and cooperative NOCR are two sides of the same coin, both based on the concept of multiuser superposition transmission, whose employment is envisioned to result in significant network capacity gains. The challenging goal to significantly improve spectrum efficiency of next-generation wireless networks calls for a fruitful exchange of ideas between NOMA and cooperative NOCR, as well as their smart combination and integration in practical applications.

Prof. Francesco Verde
Guest Editor

Manuscript Submission Information

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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

  • Multiuser transmissions
  • Non-orthogonal multiple access (NOMA)
  • Non-orthogonal cognitive radio (NOCR)
  • Spectral efficiency
  • Superposition coding

Published Papers (7 papers)

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Research

17 pages, 864 KiB  
Article
Application of NOMA in Wireless System with Wireless Power Transfer Scheme: Outage and Ergodic Capacity Performance Analysis
by Dinh-Thuan Do and Chi-Bao Le
Sensors 2018, 18(10), 3501; https://doi.org/10.3390/s18103501 - 17 Oct 2018
Cited by 72 | Viewed by 4044
Abstract
Non-orthogonal multiple access (NOMA) and energy harvesting (EH) are combined to introduce a dual-hop wireless sensor system. In particular, this paper considers a novel EH protocol based on time power switching-based relaying (TPSR) architecture for amplify-and-forward (AF) mode. We introduce a novel system [...] Read more.
Non-orthogonal multiple access (NOMA) and energy harvesting (EH) are combined to introduce a dual-hop wireless sensor system. In particular, this paper considers a novel EH protocol based on time power switching-based relaying (TPSR) architecture for amplify-and-forward (AF) mode. We introduce a novel system model presenting wireless network with impacts of energy harvesting fractions and derive analytical expressions for outage probability and ergodic rate for the information transmission link. It confirmed that the right selection of power allocation for NOMA users can be performed to obtain optimal outage and ergodic capacity performance. Theoretical results show that, in comparison with the conventional solutions, the proposed model can achieve acceptable outage performance for sufficiently small threshold signal to noise ratio (SNR) with condition of controlling time switching fractions and power splitting fractions appropriately in considered TPSR protocol. We also examine the impacts of transmitting power at source, transmission rate, the other key parameters of TPSR to outage, and ergodic performance. Simulation results are presented to corroborate the proposed system. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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21 pages, 1179 KiB  
Article
Fractional Frequency Reuse Scheme for Device to Device Communication Underlaying Cellular on Wireless Multimedia Sensor Networks
by Jeehyeong Kim, Teasung Kim, Jaewon Noh and Sunghyun Cho
Sensors 2018, 18(8), 2661; https://doi.org/10.3390/s18082661 - 13 Aug 2018
Cited by 13 | Viewed by 3665
Abstract
Wireless multimedia sensor networks (WMSNs) have been improved with the increase of multimedia data. In WMSNs, a centralization problem can occur because of large-size multimedia data. It is necessary to consider device-to-device (D2D) communication. We focus on D2D WMSN based on cellular networks. [...] Read more.
Wireless multimedia sensor networks (WMSNs) have been improved with the increase of multimedia data. In WMSNs, a centralization problem can occur because of large-size multimedia data. It is necessary to consider device-to-device (D2D) communication. We focus on D2D WMSN based on cellular networks. Sensors in the D2D WMSN can non-orthogonally use a cellular link, which is a wireless communication channel between a sensor and an aggregator, and a D2D link, which is the channel between sensors. As a result, it has more complex interference environments than an ordinary system. Therefore, it is a key factor to manage the varying inter-cell interference effectively for throughput improvement. We propose an interference mitigation scheme that can be applied to D2D WMSN. In the proposed scheme, a cell is separated into six zones and orthogonal frequency is allocated to each zone for cellular links. The frequencies allocated to cellular links are reused by D2D links of neighboring zones. The simulation results show that the throughput of the proposed scheme increases two times compared to a static frequency allocation scheme. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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17 pages, 498 KiB  
Article
Optimal Resource Allocation for Uplink Data Collection in Nonorthogonal Multiple Access Networks
by Yuan Wu, Cheng Zhang, Kejie Ni, Liping Qian, Liang Huang and Wei Zhu
Sensors 2018, 18(8), 2542; https://doi.org/10.3390/s18082542 - 03 Aug 2018
Cited by 3 | Viewed by 2769
Abstract
Accommodating massive connectivity for Internet of Things (IoT) applications is considered an important goal of future 5G cellular systems. Nonorthogonal multiple access (NOMA), which enables a group of mobile users to simultaneously share the same spectrum channel for transmission, provides an efficient approach [...] Read more.
Accommodating massive connectivity for Internet of Things (IoT) applications is considered an important goal of future 5G cellular systems. Nonorthogonal multiple access (NOMA), which enables a group of mobile users to simultaneously share the same spectrum channel for transmission, provides an efficient approach to achieve the goals of spectrum-efficient data delivery. In this paper, we consider an uplink transmission in a sensor network in which a group of smart terminals (e.g., sensors) use NOMA to send their collected data to an access point. We aim to minimize the total radio resource consumption cost, including the cost for the channel usage and the cost for all senors’ energy consumption to allow the sensors to complete their data delivery requirements. Specifically, we formulate a joint optimization of the decoding-order, transmit-power and time allocations to study this problem and propose an efficient algorithm to find the optimal solution. Numerical results are provided to validate our proposed algorithm and the performance advantage of our proposed joint optimization for the uplink data collection via NOMA transmission. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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19 pages, 1737 KiB  
Article
Fast Convolution Filter-Bank Based Non-Orthogonal Multiplexed Cognitive Radio (NOMCR) Receiver Design Using Cyclostationarity Based FRESH Filtering
by Jayanta Datta and Hsin-Piao Lin
Sensors 2018, 18(6), 1930; https://doi.org/10.3390/s18061930 - 13 Jun 2018
Cited by 3 | Viewed by 3382
Abstract
Non-orthogonal multiple access (NOMA) systems are being considered as candidates for 5G wireless systems due to their promise of improved spectral efficiency. NOMA schemes are being combined with popular multicarrier schemes such as orthogonal frequency division multiplexing (OFDM) to take advantage of the [...] Read more.
Non-orthogonal multiple access (NOMA) systems are being considered as candidates for 5G wireless systems due to their promise of improved spectral efficiency. NOMA schemes are being combined with popular multicarrier schemes such as orthogonal frequency division multiplexing (OFDM) to take advantage of the benefits of multicarrier signals. A variant of the power domain NOMA is Layer Division Multiplexing (LDM). The most commonly deployed power domain LDM scheme involves successive interference cancellation (SIC) based decoding at the receiver. Fast convolution based filtered-OFDM (FC-F-OFDM) systems are becoming popular among 5G wireless access technologies due to their ability to process 5G physical layer signals efficiently. In this work, firstly, a cognitive multicarrier non-orthogonal multiplexed system based on the concept of LDM is discussed, which uses FC-F-OFDM and conventional OFDM as its component layers. Secondly, cyclostationary FREquency SHift (FRESH) filter based SIC decoding is used at the receiver side, which also utilizes artificial neural network (ANN) processing. Computer simulations indicate that the system provides good bit error rate (BER) performance under frequency selective Rayleigh fading channels. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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20 pages, 4763 KiB  
Article
Trellis Tone Modulation Multiple-Access for Peer Discovery in D2D Networks
by Chiwoo Lim, Min Jang and Sang-Hyo Kim
Sensors 2018, 18(4), 1228; https://doi.org/10.3390/s18041228 - 17 Apr 2018
Cited by 5 | Viewed by 3271
Abstract
In this paper, a new non-orthogonal multiple-access scheme, trellis tone modulation multiple-access (TTMMA), is proposed for peer discovery of distributed device-to-device (D2D) communication. The range and capacity of discovery are important performance metrics in peer discovery. The proposed trellis tone modulation uses single-tone [...] Read more.
In this paper, a new non-orthogonal multiple-access scheme, trellis tone modulation multiple-access (TTMMA), is proposed for peer discovery of distributed device-to-device (D2D) communication. The range and capacity of discovery are important performance metrics in peer discovery. The proposed trellis tone modulation uses single-tone transmission and achieves a long discovery range due to its low Peak-to-Average Power Ratio (PAPR). The TTMMA also exploits non-orthogonal resource assignment to increase the discovery capacity. For the multi-user detection of superposed multiple-access signals, a message-passing algorithm with supplementary schemes are proposed. With TTMMA and its message-passing demodulation, approximately 1.5 times the number of devices are discovered compared to the conventional frequency division multiple-access (FDMA)-based discovery. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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12 pages, 1149 KiB  
Article
Performance Analysis of Diversity-Controlled Multi-User Superposition Transmission for 5G Wireless Networks
by Jeong Seon Yeom, Eunmi Chu, Bang Chul Jung and Hu Jin
Sensors 2018, 18(2), 536; https://doi.org/10.3390/s18020536 - 10 Feb 2018
Cited by 8 | Viewed by 4014
Abstract
In this paper, we propose a novel low-complexity multi-user superposition transmission (MUST) technique for 5G downlink networks, which allows multiple cell-edge users to be multiplexed with a single cell-center user. We call the proposed technique diversity-controlled MUST technique since the cell-center user enjoys [...] Read more.
In this paper, we propose a novel low-complexity multi-user superposition transmission (MUST) technique for 5G downlink networks, which allows multiple cell-edge users to be multiplexed with a single cell-center user. We call the proposed technique diversity-controlled MUST technique since the cell-center user enjoys the frequency diversity effect via signal repetition over multiple orthogonal frequency division multiplexing (OFDM) sub-carriers. We assume that a base station is equipped with a single antenna but users are equipped with multiple antennas. In addition, we assume that the quadrature phase shift keying (QPSK) modulation is used for users. We mathematically analyze the bit error rate (BER) of both cell-edge users and cell-center users, which is the first theoretical result in the literature to the best of our knowledge. The mathematical analysis is validated through extensive link-level simulations. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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16 pages, 2447 KiB  
Article
Non-Orthogonal Multiple Access for Ubiquitous Wireless Sensor Networks
by Asim Anwar, Boon-Chong Seet and Zhiguo Ding
Sensors 2018, 18(2), 516; https://doi.org/10.3390/s18020516 - 08 Feb 2018
Cited by 17 | Viewed by 4121
Abstract
Ubiquitous wireless sensor networks (UWSNs) have become a critical technology for enabling smart cities and other ubiquitous monitoring applications. Their deployment, however, can be seriously hampered by the spectrum available to the sheer number of sensors for communication. To support the communication needs [...] Read more.
Ubiquitous wireless sensor networks (UWSNs) have become a critical technology for enabling smart cities and other ubiquitous monitoring applications. Their deployment, however, can be seriously hampered by the spectrum available to the sheer number of sensors for communication. To support the communication needs of UWSNs without requiring more spectrum resources, the power-domain non-orthogonal multiple access (NOMA) technique originally proposed for 5th Generation (5G) cellular networks is investigated for UWSNs for the first time in this paper. However, unlike 5G networks that operate in the licensed spectrum, UWSNs mostly operate in unlicensed spectrum where sensors also experience cross-technology interferences from other devices sharing the same spectrum. In this paper, we model the interferences from various sources at the sensors using stochastic geometry framework. To evaluate the performance, we derive a theorem and present new closed form expression for the outage probability of the sensors in a downlink scenario under interference limited environment. In addition, diversity analysis for the ordered NOMA users is performed. Based on the derived outage probability, we evaluate the average link throughput and energy consumption efficiency of NOMA against conventional orthogonal multiple access (OMA) technique in UWSNs. Further, the required computational complexity for the NOMA users is presented. Full article
(This article belongs to the Special Issue Non-Orthogonal Multi-User Transmissions for 5G Networks)
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