Reconfigurable Intelligent Surfaces Assisted Hybrid NOMA System

Kumar, M. Hemanta; Sharma, Sanjeev; Deka, Kuntal; Thottappan, M.

doi:10.1109/lcomm.2022.3211292

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…where γth1 = γth C1−C2γth . The PDF f Heq (x) given in (3) using in (25), after some algebra and using [38], Z reduces to…”

Section: ) Outage Probabilitymentioning

confidence: 99%

“…The studies of the above-mentioned articles [18]- [22], clearly indicate that adopting the NOMA scheme in a RIS-assisted network can improve the network performance significantly. D2D communication is also explored with RIS-assisted networks using the NOMA scheme to enhance the performance of a D2D network [23]- [25]. The authors of [24], [25], observed enhancements in spectral and energy efficiency with the inclusion of the RIS and NOMA scheme in their proposed D2D network.…”

Section: Introductionmentioning

confidence: 99%

“…D2D communication is also explored with RIS-assisted networks using the NOMA scheme to enhance the performance of a D2D network [23]- [25]. The authors of [24], [25], observed enhancements in spectral and energy efficiency with the inclusion of the RIS and NOMA scheme in their proposed D2D network. Moreover, the authors of [25] proposed a hybrid-NOMA scheme that performs better in comparison to RIS-NOMA and RIS-OMA schemes over the proposed network.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of [24], [25], observed enhancements in spectral and energy efficiency with the inclusion of the RIS and NOMA scheme in their proposed D2D network. Moreover, the authors of [25] proposed a hybrid-NOMA scheme that performs better in comparison to RIS-NOMA and RIS-OMA schemes over the proposed network. The effect of the RISE-6G project of European Union (EU), which is targeting the network of 2030 and beyond, inspired the researchers to explore the possibility of a multi-RIS-assisted communication network [26], [27].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Multi-RIS-Assisted D2D Communication Using NOMA

Kumar,

Bhowmick,

Choukiker

2023

IEEE Access

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Future 5G technologies increase spectrum efficiency and wireless capacity by supporting numerous connections at once. New designs are therefore required in order to support the future 5G vision. A desirable technique for beyond 5G, device-to-device (D2D) communication improves spectrum efficiency, capacity and lowers end-to-end latency as devices in close proximity interact directly with one another without using cellular infrastructure. As a result, the network needs a new, efficient D2D communication framework that can boost network performance. D2D communication with re-configurable intelligent surface (RIS) improves the performance of a communication network. In this work, a multi-RIS-assisted D2D communication using non-orthogonal multiple access (MRDN) network is studied. The proposed MRDN network model investigates the outage and throughput performance over Rician fading channels. Two possibilities are taken into consideration in this regard: (i) choosing the best received signal, and (ii) combining all received signals. Influence of imperfect successive interference cancellation (SIC) is explored to maintain practicability as NOMA is employed. In this regard, a thorough network modeling is carried out and new analytical formulas for the probability density function (PDF) of the equivalent channel and combined channel, outage, and throughput are developed. It is observed that combining of all received signals scenario performs better as compared to the other one. The impact of the number of RIS elements on the performance of the MRDN is significant. The performance of MRDN improves as the number of RIS increases. Performance of non-orthogonal multiple access (NOMA) scheme is also compared with the conventional orthogonal multiple access (OMA) scheme. Capacity gain is also investigated to test the superiority of NOMA over OMA.

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“…where γth1 = γth C1−C2γth . The PDF f Heq (x) given in (3) using in (25), after some algebra and using [38], Z reduces to…”

Section: ) Outage Probabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of Multi-RIS-Assisted D2D Communication Using NOMA

Kumar,

Bhowmick,

Choukiker

2023

IEEE Access

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show abstract

“…For example, while the power difference required in power domain NOMA is generally conducted at the Tx or Rx, a hybrid RIS with active and passive partitions has been utilized to enable the power difference over the air in UL scenario [29]. In [31] and [32], two RIS partitioned systems are introduced to maximize diversity order and improve signal quality, and an RIS assisted UE pairing THz-NOMA system has been proposed that pairs UEs based on the distance and power allocation between them to enhance their bit error rate (BER) performance, respectively. Other works also investigate the physical layer security for RIS-NOMA systems, joint active and passive beamforming for MISO RIS-aided NOMA to maximize the sum rate [33], joint location and beamforming designs for STAR-RIS assisted NOMA systems, and attach an RIS to an unmanned aerial vehicles (UAV) to assist in communication to other base station (BS) to UAV or UE communications [34]- [36].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Intelligent Surface Enabled Over-the-Air Uplink NOMA

Arslan

Kilinc

Arzykulov

et al. 2023

IEEE Trans. on Green Commun. Netw.

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Innovative reconfigurable intelligent surface (RIS) technologies are rising and recognized as promising candidates to enhance 6G and beyond wireless communication systems. RISs acquire the ability to manipulate electromagnetic signals, thus, offering a degree of control over the wireless channel and the potential for many more benefits. Furthermore, active RIS designs have recently been introduced to combat the critical double fading problem and other impairments passive RIS designs may possess. In this paper, the potential and flexibility of active RIS technology are exploited for uplink systems to achieve virtual non-orthogonal multiple access (NOMA) through power disparity over-the-air rather than controlling transmit powers at the user side. Specifically, users with identical transmit power, path loss, and distance can communicate with a base station sharing time and frequency resources in a NOMA fashion with the aid of the proposed hybrid RIS system. Here, the RIS is partitioned into active and passive parts and the distinctive partitions serve different users aligning their phases accordingly while introducing a power difference to the users' signals to enable NOMA. First, the end-to-end system model is presented considering two users. Furthermore, outage probability calculations and theoretical error probability analysis are discussed and reinforced with computer simulation results.

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Maximizing throughput and energy efficiency in 6G based on phone user clustering enabled UAV assisted downlink hybrid multiple access HetNet

Ghafoor,

Ashraf

2024

Telecommun Syst

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Reconfigurable Intelligent Surfaces Assisted Hybrid NOMA System

Cited by 16 publications

References 16 publications

Performance of Multi-RIS-Assisted D2D Communication Using NOMA

Performance of Multi-RIS-Assisted D2D Communication Using NOMA

Reconfigurable Intelligent Surface Enabled Over-the-Air Uplink NOMA

Maximizing throughput and energy efficiency in 6G based on phone user clustering enabled UAV assisted downlink hybrid multiple access HetNet

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