A Hybrid NOMA/OMA Scheme for MTC in Ultra-Dense Networks

Elbayoumi, Mohammed; Hamouda, Walaa; Youssef, Amr M.

doi:10.1109/globecom42002.2020.9322207

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…The usage of NOMA techniques entails a lot of multiuser interference in the system; however, these methods increase the effective throughput in the system. Hybrid NOMA/OMA systems have been proposed [4,5] to overcome the main disadvantages caused by the MAI. Several papers have dealt with SIC algorithms [1][2][3] and NOMA/OMA user selection [4,5].…”

Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

“…Hybrid NOMA/OMA systems have been proposed [4,5] to overcome the main disadvantages caused by the MAI. Several papers have dealt with SIC algorithms [1][2][3] and NOMA/OMA user selection [4,5].…”

Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

“…Though CR-NOMA Transmission at Double Selective channels is mainly incoherent and channel conditions for users use to be significantly different. Moreover, as it was pointed at [4,5], significant differences for channel conditions for OMA and NOMA users are necessary and sufficient conditions for effective decoding for both types of users.…”

Section: Introductionmentioning

confidence: 97%

“…On the other hand, hybrid NOMA / OMA schemes have been proposed [4,5] to overcome the drawbacks of pure NOMA systems and enhance pure OMA schemes in terms of total throughput. Hybrid NOMA schemes require an effective way to separate NOMA / OMA users.…”

Section: Introductionmentioning

confidence: 99%

“…Promising techniques to successfully separate NOMA/OMA users are the ones used in Cognitive Radio: a few decades ago, Cognitive Radio (CR) technology was proposed to improve spectrum utilization by allowing a secondary user (SU) to access idle spectrum allocated to a primary user (PU) [6]. Lately, the usage of Cognitive Radio-based NOMA (CR-NOMA) for power domain NOMA has been suggested to allow the SU spectrum regardless of the presence of the primary user [7] and also to separate users in NOMA/OMA hybrid schemes [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

NOMA Transmission Systems: Overview of SIC Design and New Findings

Estrello¹,

Ramos-Alarcon²,

Kontorovich³

2022

Multiplexing - Recent Advances and Novel Applications

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Non-Orthogonal Multiple Access (NOMA) has been recently proposed as a good alternative to meet 5G and beyond requirements in terms of high spectral efficiency, massive connectivity, and low latency. It has been demonstrated that the use of NOMA in downlink has superior performance in terms of throughput, whereas the use in uplink outperforms OMA techniques in terms of fairness. A distinctive feature of NOMA is the presence of excessive multiple-access interference due to the case of usage of power domain to multiplex signals, thus the functional implementation of NOMA implies Successive Interference Cancelation (SIC) to combat this interference. Therefore, SIC design becomes the main point in the effectiveness of NOMA systems. On the other hand, hybrid schemes, NOMA/OMA, have been recently proposed to reduce the drawbacks of pure NOMA systems. However, in these schemes, it becomes necessary to distinguish NOMA and OMA users. Cognitive Radio techniques turn to be a good option to effectively separate NOMA/OMA users as well as to distinguish NOMA users. In this chapter, a brief overview of NOMA techniques related to Cognitive Radio technology (CR-NOMA) and SIC design reported in the literature is presented. Also, new findings about NOMA/OMA users’ recognition are described.

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Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

Section: A Brief Overview About Sic Algorithms In Noma Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

NOMA Transmission Systems: Overview of SIC Design and New Findings

Estrello¹,

Ramos-Alarcon²,

Kontorovich³

2022

Multiplexing - Recent Advances and Novel Applications

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MIMO Hybrid PD-SCMA NOMA Uplink Transceiver System

Chege

Walingo

2022

IEEE Access

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The application of multiple-input multiple-output (MIMO) on power domain sparse code multiple access (PD-SCMA) systems would enhance their performance by increasing the multiplexing and diversity gains. However, this is at a cost of increased detection complexity, as more users and antennas are deployed. This work develops and investigates the performance of spatial multiplexing MIMO based hybrid PD-SCMA system (M-PD-SCMA) transceiver on an uplink heterogeneous network over Rayleigh flatfading channels. The aim is to strike a balance on the number of antennas and capacity/spectral efficiency. The system capacity and outage robustness of the proposed transceiver in imperfect channels is evaluated and the bit error rate (BER) performance analysed. The link-level simulation results demonstrate that M-PD-SCMA achieves performance benchmark with PD-SCMA schemes. The proposed receiver achieves guaranteed BER performance with an increase in the number of transmit and receive antennas. Besides, the results highlight the impact of the codebook size, number of layers and power level distinctiveness on the outage bounds at each receive antenna at different SNR levels. Thus, the feasibility of an M-PD-SCMA system is validated.

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