Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals

Ramírez, Tomás; Mosquera, Carlos; Noels, Nele; Caus, Màrius; Bas, Joan; Blanco, Luis; Alagha, Nader

doi:10.1109/asms/spsc48805.2020.9268878

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…While NOMA is fully incorporated in the American DTV standard ATSC, there had been many proposals to include NOMA in the other major DTV standard, Digital Video Broadcasting (DVB). These include the use of NOMA for satellite DVB-S2X [259] and for terrestrial DVB-T [260]. A comprehensive account of NOMA based broadcast services may be found in Table 2 of the recent article by Shariatzadeh et al [261].…”

Section: A Standardization Activitiesmentioning

confidence: 99%

A Survey on Cache-Aided NOMA for 6G Networks

Bepari¹,

Mondal²,

Chandra³

et al. 2022

Preprint

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Contrary to orthogonal multiple-access (OMA), non-orthogonal multiple-access (NOMA) schemes can serve a pool of users without exploiting the scarce frequency or time domain resources. This is useful in meeting the sixth generation (6G) network requirements, such as, low latency, massive connectivity, users' fairness, and high spectral efficiency. On the other hand, content caching restricts duplicate data transmission by storing popular contents in advance at the network edge which reduces 6G data traffic. In this survey, we focus on cache-aided NOMA-based wireless networks which can reap the benefits of both cache and NOMA; switching to NOMA from OMA enables cache-aided networks to push additional files to content servers in parallel and improve the cache hit probability. Beginning with fundamentals of cache-aided NOMA technology, we summarize the performance goals of cache-aided NOMA systems, present the associated design challenges, and categorize related recent literature based on their application verticals. Concomitant standardization activities and open research challenges are highlighted as well.

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Section: A Standardization Activitiesmentioning

confidence: 99%

A Survey on Cache-Aided NOMA for 6G Networks

Bepari¹,

Mondal²,

Chandra³

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…However, the numerical results presented in Section 5 show that the computational complexity translates into a significant SINR increase with respect to the fixed beamforming approach. Sticking to the system model formulated in (14), the estimated covariance matrices can be computed as:…”

Section: Resource Sharing Beamforming Accessmentioning

confidence: 99%

“…The sparse code multiple access (SCMA) [10] and the contention resolution diversity slotted Aloha (CRDSA) [11] are advanced access schemes that require time slot synchronization. Prominent access schemes that are able to operate in asynchronous mode include the asynchronous contention resolution diversity Aloha (ACRDA) [12], the enhanced spread spectrum Aloha (E-SSA) [13,14], and the asynchronous flipped SCMA (AF-SCMA) [15]. An alternative approach that is referred to as resource sharing beamforming access (RSBA) has been proposed in [16].…”

Section: Introductionmentioning

confidence: 99%

Smart Beamforming for Direct LEO Satellite Access of Future IoT

Caus

Pérez-Neira

Mendez

2021

Sensors

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Non-terrestrial networks (NTN) are expected to play a key role in extending and complementing terrestrial 5G networks in order to provide services to air, sea, and un-served or under-served areas. This paper focuses the attention on the uplink, where terminals are able to establish a direct link with the NTN at Ka-band. To reduce the collision probability when a large population of terminals is transmitting simultaneously, we propose a grant-free access scheme called resource sharing beamforming access (RSBA). We study RBSA for low Earth orbit (LEO) satellite communications with massive multiple-input multiple-output (MIMO). The idea is to benefit from the spatial diversity to decode multiple overlapped signals. We have devised a blind and open-loop beamforming technique, where neither the receiver must carry out brute-force search in azimuth and elevation, nor are the terminals required to report channel state information. Upon deriving the theoretical throughput, we show that RBSA is appropriate for grant-free access to LEO satellite, it reduces the probability of collision, and thus it increases the number of terminals that can access the media. Practical implementation aspects have been tackled, such as the estimation of the required statistics, and the determination of the number of users.

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Contribution of non‐orthogonal multiple access signalling to practical multibeam satellite deployments

Ramírez,

Mosquera

2023

Satell Commun Network

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SummaryThis work explores the contribution of non‐orthogonal multiple access (NOMA) signalling to improve some relevant metrics of a multibeam satellite downlink. Users are paired to exploit signal‐to‐noise ratio (SNR) imbalances coming from the coexistence of different types of terminals, and they can be flexibly allocated to the beams, thus relaxing the cell boundaries of the satellite footprint. Different practical considerations are accommodated, such as a spatially non‐uniform traffic demand, non‐linear amplification effects and the use of the DVB‐S2X air interface. Results show how higher traffic volumes can be channelized by the satellite, thanks to the additional bit rates which are generated for the strong users under the superposition of signals, with carefully designed power levels for DVB‐S2X modulation and coding schemes in the presence of non‐linear impairments.

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Study on the Application of NOMA Techniques for Heterogeneous Satellite Terminals

Cited by 6 publications

References 12 publications

A Survey on Cache-Aided NOMA for 6G Networks

A Survey on Cache-Aided NOMA for 6G Networks

Smart Beamforming for Direct LEO Satellite Access of Future IoT

Contribution of non‐orthogonal multiple access signalling to practical multibeam satellite deployments

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