Hierarchical Full-Duplex Underwater Acoustic Network: A NOMA Approach

Makled, Esraa A.; Yadav, Animesh; Dobre, Octavia A.; Haynes, Ronald D.

doi:10.1109/oceans.2018.8604904

Cited by 19 publications

(8 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) R-FD-NOMA [271] In [271], authors integrated NOMA with UWAC to improve the sum rate of the UWA channel using a relay and FD. The presence of FD-NOMA allows multiple uplink and downlink transmissions to occur simultaneously, using the same time and frequency resources.…”

Section: Underwater Acoustic Communicationmentioning

confidence: 99%

A Systematic Review on NOMA Variants for 5G and Beyond

et al. 2021

View full text Add to dashboard Cite

Over the last few years, interference has been a major hurdle for successfully implementing various end-user applications in the fifth-generation (5G) of wireless networks. During this era, several communication protocols and standards have been developed and used by the community. However, interference persists, keeping given quality of service (QoS) provision to end-users for different 5G applications. To mitigate the issues mentioned above, in this paper, we present an in-depth survey of state-ofthe-art non-orthogonal multiple access (NOMA) variants having power and code domains as the backbone for interference mitigation, resource allocations, and QoS management in the 5G environment. These are future smart communication and supported by device-to-device (D2D), cooperative communication (CC), multiple-input and multiple-output (MIMO), and heterogeneous networks (HetNets). From the existing literature, it has been observed that NOMA can resolve most of the issues in the existing proposals to provide contention-based grant-free transmissions between different devices. The key differences between the orthogonal multiple access (OMA) and NOMA in 5G are also discussed in detail. Moreover, several open issues and research challenges of NOMA-based applications are analyzed. Finally, a comparative analysis of different existing proposals is also discussed to provide deep insights to the readers.

show abstract

Section: Underwater Acoustic Communicationmentioning

confidence: 99%

A Systematic Review on NOMA Variants for 5G and Beyond

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Further, the low probability of detection (LPD) has been addressed using spread spectrum. Hence, researchers showed interest in direct sequence spread spectrum as a result of these advantages, and it was used in various FD-UWAC systems, where it demonstrated significant efficiency by reducing the effects of fading, noise, jamming, and self-interference [30][31][32]. A hybrid SS approach is often used in order to establish an FD link connection between multi-user modems for the transmission of data streams and to preserve synchronization between the simultaneously received signals [33].…”

Section: Motivations and Contributionsmentioning

confidence: 99%

“…Due to the availability of limited FD-UWAC channel bandwidth, ISI is caused by time-varying multipath effects [46,47]. The multipath effect occurs in shallow water interaction due to the surface reflection and refraction effect [48], causing substantial end-to-end delays and an increase in bit error rates [32,49]. Furthermore, the increased depth's multipath effect has an influence on the UW communication channel's vertical and horizontal link configuration.…”

Section: Challenges Faced By Fd Physical Layered Uwac Systemsmentioning

confidence: 99%

Full Duplex Physical and MAC Layer-Based Underwater Wireless Communication Systems and Protocols: Opportunities, Challenges, and Future Directions

Liu

Iqbal

Khan

et al. 2021

JMSE

View full text Add to dashboard Cite

Underwater wireless communication has gained a great deal of attention in the last couple of decades because of its applications in the military, industrial, and monitoring sectors. Despite the extreme physical and MAC layer difficulties, acoustics are used for various applications among the various modes of underwater communication technologies used. While significant research efforts have been made to address these issues, the bottleneck remains in achieving high bandwidth, high throughputs, and data rate. Researchers have begun to look into full duplex (FD) implementation to improve bandwidth efficiency and increase data rate and throughput. Users can send and receive data simultaneously over the FD links, maximizing bandwidth utilization and increasing throughput. As a result, we thoroughly reviewed various FD physical layered UWAC systems and MAC layered protocols for underwater communication. The various problems that the aforementioned systems and protocols have faced, as well as the solutions suggested in previous works to solve each problem, are also highlighted. Various metrics are used to compare the performance of various physical layered FD systems and FD MAC protocols. We also explore some of the open research questions in these FD-physical layered and MAC layered protocols, as well as future research directions. Based on ample information, we suggest a cross-layered architecture based on various IBFD-SI cancellations, DA-CSMA, and FD-MAC protocols. This review provides a broad view of the current FD physical and MAC layered protocols based on acoustic communication, as well as recommendations.

show abstract

“…This paper provides the capability of NOMA schemes in underwater communication systems. In [47] the authors try to increase the sum rate of the underwater channel without applying additional resources, by using relay theory and employing full‐duplex (FD) NOMA technologies. To achieve a maximum sum rate, an optimisation problem over the power allocation is formulated and solved as a convex optimisation problem.…”

Section: Introductionmentioning

confidence: 99%