Comparison Study Between PD-NOMA and SCMA

Moltafet, Mohammad; Yamchi, Nader Mokari; Javan, Mohammad Reza; Azmi, Paeiz

doi:10.1109/tvt.2017.2759910

Cited by 120 publications

(95 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NOMA has been integrated into the third‐generation partnership project long‐term evolution (3GPP‐LTE) and digital TV standard ATSC 3.0 as multi‐user superposition transmission (MUST) and layered division multiplexing (LDM) technique, respectively . Power domain NOMA system is more compatible in spectral efficiency compared with sparse code NOMA and orthogonal multiple access (OMA) technique . In power domain NOMA, multiple users are paired based on the difference in channel conditions.…”

Section: Introductionmentioning

confidence: 99%

“…4 Power domain NOMA system is more compatible in spectral efficiency compared with sparse code NOMA and orthogonal multiple access (OMA) technique. [5][6][7] In power domain NOMA, multiple users are paired based on the difference in channel conditions. In a downlink two-user scenario, more power is allocated to far user (FU), and less power is allocated to near user (NU).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Outage analysis of SWIPT‐based full‐duplex cognitive NOMA downlink system over Nakagami‐m fading channels

Sashiganth

Thiruvengadam²,

Kumar

2020

Int J Communication

View full text Add to dashboard Cite

Summary Cognitive nonorthogonal multiple access (NOMA) technique allows multiple users to share the same time and same frequency resources to fulfil the reliability and spectral efficiency requirements of 5G communication standards. In this paper, simultaneous wireless information and power transfer (SWIPT)–based full‐duplex cognitive NOMA downlink system is proposed. In this system, secondary source (SS) serves as a relay to far primary user as there is no direct link from the primary source. NOMA technique is used at SS to transmit information to far primary user and secondary user. The time switching mechanism is adopted at SS for harvesting energy and information decoding. Analytical closed‐form expressions are derived for the outage probabilities of both primary and secondary users. Outage analysis is carried out in Nakagami‐ m fading environment in the presence of self‐interference at SS. In addition to that, the optimal harvesting time to maximize the instantaneous throughput of the far primary user is also derived. Numerical results are plotted to validate the derived expressions. It is inferred that the outage probability of the proposed system depends on the fading environment, harvesting parameters, and self‐interference at SS.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Outage analysis of SWIPT‐based full‐duplex cognitive NOMA downlink system over Nakagami‐m fading channels

Sashiganth

Thiruvengadam²,

Kumar

2020

Int J Communication

View full text Add to dashboard Cite

show abstract

“…M On the other side, to meet the spectrum efficiency demands of data hungry services in 5G, new transmission techniques are under-investigated where non-orthogonal multiple access (NOMA) techniques are one of the promising approaches here [3]. On of the interesting NOMA techniques to address the mentioned challenges is sparse code multiple access (SCMA) which can enhance the system performance compared to the other access techniques [4], [5]. By applying the SCMA, each subcarrier can be reused more than one time in the coverage area of radio remote head (RRH).…”

Section: Introductionmentioning

confidence: 99%

Robust Radio Resource Allocation in MISO-SCMA Assisted C-RAN in 5G Networks

Moltafet

Parsaeefard

Javan

et al. 2019

IEEE Trans. Veh. Technol.

Self Cite

View full text Add to dashboard Cite

In this paper, by considering multiple slices, a downlink transmission of a sparse code multiple access (SCMA) based cloud-radio access network (C-RAN) is investigated. In this regard, by supposing multiple input and single output (MISO) transmission technology, a novel robust radio resource allocation is proposed where considering uncertain channel state information (CSI), the worst case approach is applied. The main goal of the proposed radio resource allocation is to, maximize the system sum rate with maximum available power at radio remote head (RRH), minimum rate requirement of each slice, maximum frounthaul capacity of each RRH, user association, and SCMA constraints. To solve the proposed optimization problem in an efficient manner, an iterative method is deployed where in each iteration, beamforming and joint codebook allocation and user association subproblem are solved separately. By introducing some auxiliary variables, the joint codebook allocation and user association subproblem is transformed into an integer linear programming, and to solve the beamforming optimization problem, minorization-maximization algorithm (MMA) is applied. Via numerical results, the performance of the proposed system model versus different system parameters and for different channel models are investigated. Index Terms-5G, Sparse code multiple access (SCMA), C-RAN, robust resource allocation.

show abstract

“…Scrambling‐based NOMA uses different scrambling code for each user and adopts repetition coding or channel coding for multiuser signal decoding. A special case of scrambling‐based NOMA called power domain NOMA (PDNOMA) scheme with all “1” scrambling code is investigated in literature . The power difference between the near and far users due to near far effect is utilized to share the same resource block by multiple users.…”

Section: Introductionmentioning

confidence: 99%

“…A special case of scrambling-based NOMA called power domain NOMA (PDNOMA) scheme with all "1" scrambling code is investigated in literature. 3 The power difference between the near and far users due to near far effect is utilized to share the same resource block by multiple users. Superposition coding at the transmitter and successive interference cancellation (SIC) at the receiver are used in the PDNOMA.…”

mentioning

confidence: 99%

Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy

Shalini¹,

Stuwart²

2019

Int J Communication

View full text Add to dashboard Cite

Summary The next generation wireless access technology highly relies on nonorthogonal multiple access (NOMA) technique. This paper proposes a novel power domain cyclic spread multiple access (PDCSMA) scheme for the design of NOMA system with power domain superposition coding (SC) and cyclic spreading at the transmitter concurrent with symbol level successive interference cancellation (SL‐SIC) at the receiver. Based on acceptable difference in channel gain, the users are grouped together to form PDCSMA clusters, and the unique power is allotted to each user in a cluster. The user with good channel condition is allotted less power, and the user with poor channel condition is allotted more power. Each PDCSMA cluster has its own spreading code, and the data of every user in a cluster are cyclic spread with the same code. Each cluster supports the number of multipath components equivalent to the length of the spreading code. The use of cyclic spreading makes the signal suffered by multipath fading less prone to intra cluster interference. The user signal is decoded by minimum mean square error‐frequency domain equalization (MMSE‐FDE) or maximal ratio combining (MRC)–based receiver in which weak user is detected with hard decision, and strong user is detected with SIC. Compared with conventional power domain NOMA (PDNOMA) and interleaved NOMA, the proposed PDCSMA achieves better bit error rate (BER) performance and assures guaranteed detection.

show abstract

Comparison Study Between PD-NOMA and SCMA

Cited by 120 publications

References 19 publications

Outage analysis of SWIPT‐based full‐duplex cognitive NOMA downlink system over Nakagami‐m fading channels

Outage analysis of SWIPT‐based full‐duplex cognitive NOMA downlink system over Nakagami‐m fading channels

Robust Radio Resource Allocation in MISO-SCMA Assisted C-RAN in 5G Networks

Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy

Contact Info

Product

Resources

About