Spectrally Efficient Uplink Cooperative NOMA With Joint Decoding for Relay-Assisted IoT Networks

Yeom, Jeong Seon; Kim, Young-bin; Jung, Bang Chul

doi:10.1109/jiot.2022.3202006

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…Therefore, a DDO should be adopted. A spectrallyefficient cooperative relaying protocol is presented for use in a scenario with multiple relayers [19]. The chosen relayer is decided based on the maximum channel gain criterion among channel gains between relayers and the destination.…”

Section: Related Workmentioning

confidence: 99%

“…Thereafter, only one (selected) relayer forwards the correctly decoded packet(s) to the destination during the second phase using OMA. Examples of relaying protocols aiming to improve the communication reliability for multiple source nodes communicating with only one destination can be found in [19]- [22]. However, achieve the reliability improvement, both the power allocation and the behavior of the relaying protocols, e.g., the selected relayer's position, play an important role, especially in the presence of jamming attacks and/or strong interference.…”

Section: Introductionmentioning

confidence: 99%

“…However, achieve the reliability improvement, both the power allocation and the behavior of the relaying protocols, e.g., the selected relayer's position, play an important role, especially in the presence of jamming attacks and/or strong interference. But the protocols presented in previous publications, e.g., [19]- [22], have not taken jamming attacks into account, and thus an investigation on the effects of jamming attacks and how to deal with them in uplink pairwise NOMA using relaying is needed. In this work, we consider the scenario as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Dealing With Jamming Attacks in Uplink Pairwise NOMA Using Outage Analysis, Smart Relaying, and Redundant Transmissions

Dao,

Uhlemann,

Girs

2024

IEEE Open J. Commun. Soc.

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This study focuses on optimizing the performance of an uplink pairwise Non-Orthogonal Multiple Access (NOMA) scenario with and without the support of a relayer, while subject to jamming attacks. We consider two different relaying protocols, one where the sources and the destination are within range of each other and one where they are not. The relay node can be mobile, e.g., a mobile base station, an unmanned aerial vehicle (UAV) or a stationary node that is chosen as a result of a relay selection procedure. We also benchmark with a NOMA retransmission protocol and an Orthogonal Multiple Access (OMA) scheme without a relayer. We analyze, adjust and compare the four protocols for different settings using outage analysis, which is an efficient tool for establishing communication reliability for both individual nodes and the overall wireless network. Closed-form expressions of outage probabilities can be adopted by deep reinforcement learning (RL) algorithms to optimize wireless networks online. Accordingly, we first derive closed-form expressions for the individual outage probability (IOP) of each source node link and the relayer link using both pairwise NOMA and OMA. Next, we analyze the IOP for one packet (IOPP) for each source node considering all possible links between the source node to the destination, taking both phases into account for the considered protocols when operating in Nakagami-m fading channels. The overall outage probability for all packets (OOPP) is defined as the maximum IOPP obtained among the source nodes. This metric is useful to optimize the whole wireless network, e.g., to ensure fairness among the source nodes. Then, we propose a method using deep RL where the OOPP is used as a reward function in order to adapt to the dynamic environment associated with jamming attacks. Finally, we discuss valuable guidelines for enhancing the communication reliability of the legitimate system.

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Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dealing With Jamming Attacks in Uplink Pairwise NOMA Using Outage Analysis, Smart Relaying, and Redundant Transmissions

Dao,

Uhlemann,

Girs

2024

IEEE Open J. Commun. Soc.

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“…It has been found that NOMA can significantly improve spectral efficiency and network capacity in wireless communication systems [ 8 , 9 ]. More recently, various NOMA techniques have been investigated, applying grant-free multiple access [ 3 , 10 ], backscatter communication [ 11 ], reconfigurable intelligent surface (RIS) [ 12 , 13 ], relay-assisted network [ 14 ], unmanned aerial vehicle (UAV)-enabled network [ 15 ], visible light communication (VLC) [ 16 ], etc.…”

Section: Introductionmentioning

confidence: 99%

A Novel Expectation-Maximization-Based Blind Receiver for Low-Complexity Uplink STLC-NOMA Systems

Lee

Jung

2022

Sensors

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In this paper, we revisit a two-user space-time line coded uplink non-orthogonal multiple access (STLC-NOMA) system for Internet-of-things (IoT) networks and propose a novel low-complexity STLC-NOMA system. The basic idea is that both IoT devices (stations: STAs) employ amplitude-shift keying (ASK) modulators and align their modulated symbols to in-phase and quadrature axes, respectively, before the STLC encoding. The phase distortion caused by wireless channels becomes compensated at the receiver side with the STLC, and thus each STA’s signals are still aligned on their axes at the access point (AP) in the proposed uplink STLC-NOMA system. Then, the AP can decode the signals transmitted from STAs via a single-user maximum-likelihood (ML) detector with low-complexity, while the conventional uplink STLC-NOMA system exploits a multi-user joint ML detector with relatively high-complexity. We mathematically analyze the exact BER performance of the proposed uplink STLC-NOMA system. Furthermore, we propose a novel expectation-maximization (EM)-based blind energy estimation (BEE) algorithm to jointly estimate both transmit power and effective channel gain of each STA without the help of pilot signals at the AP. Somewhat interestingly, the proposed BEE algorithm works well even in short-packet transmission scenarios. It is worth noting that the proposed uplink STLC-NOMA architecture outperforms the conventional STLC-NOMA technique in terms of bit-error-rate (BER), especially with high-order modulation schemes, even though it requires lower computation complexity than the conventional technique at the receiver.

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Adaptive Rate Maximization and Hierarchical Resource Management for Underlay Spectrum Sharing NOMA HetNets with Hybrid Power Supplies

Duan

Mirzaei

2023

Mobile Netw Appl

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Spectrally Efficient Uplink Cooperative NOMA With Joint Decoding for Relay-Assisted IoT Networks

Cited by 9 publications

References 46 publications

Dealing With Jamming Attacks in Uplink Pairwise NOMA Using Outage Analysis, Smart Relaying, and Redundant Transmissions

Dealing With Jamming Attacks in Uplink Pairwise NOMA Using Outage Analysis, Smart Relaying, and Redundant Transmissions

A Novel Expectation-Maximization-Based Blind Receiver for Low-Complexity Uplink STLC-NOMA Systems

Adaptive Rate Maximization and Hierarchical Resource Management for Underlay Spectrum Sharing NOMA HetNets with Hybrid Power Supplies

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