Non-Orthogonal Multiple Access: A Constellation Domain Multiplexing Approach

Chauhan, Ankita; Jaiswal, Anshul

doi:10.1109/pimrc48278.2020.9217330

Cited by 16 publications

(8 citation statements)

References 17 publications

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“…The authors of [92] generalize the idea in [91] for two users case considering arbitrary rotation angles and more flexible choices of modulation schemes including M n -PSK or M n -QAM constellation. The need of joint multiuser detection or SIC is eliminated by rotating the constellations of both users and multiplexing the real component of user 1 in the in-phase axis, while the imaginary component of user 2 is multiplexed in the quadrature-phase axis.…”

Section: B Constellation Rotationmentioning

confidence: 99%

Error Rate Analysis of NOMA: Principles, Survey and Future Directions

Yahya¹,

Ahmed²,

Alsusa³

et al. 2023

Preprint

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<div>Non-orthogonal multiple access (NOMA) has received an enormous attention in the recent literature due to its potential to improve the spectral efficiency of wireless networks. For several years, most of the research efforts on the performance analysis of NOMA were steered towards the ergodic sum rate and outage probability. More recently, error rate analysis of NOMA has attracted massive attention and sparked massive number of researchers whose aim was to evaluate the error rate of the various NOMA configurations and designs. Therefore, the large number of publications that appeared in a short time duration made highly challenging for the research community to identify the contribution of the different research articles. Therefore, this work aims at surveying the research work that considers NOMA error rate analysis and classifying the contributions of each work. Therefore, work redundancy and overlap can be minimized, research gabs can be identified, and future research directions can be outlined. Moreover, this work presents the principles of NOMA error rate analysis.</div>

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Section: B Constellation Rotationmentioning

confidence: 99%

Error Rate Analysis of NOMA: Principles, Survey and Future Directions

Yahya¹,

Ahmed²,

Alsusa³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…To overcome the high complexity and low error probability in NOMA systems, phase rotation (PR) based NOMA has been presented in many recent works [9]- [13]. Previous studies have considered the concept of signal space diversity (SSD) [14].…”

Section: A Related Workmentioning

confidence: 99%

“…The key point of SSD is to apply a certain constellation rotation so that no overlapping coordinates exist among all symbols of the superposed signal. The NOMA system employing SSD rotates the symbol of either one user [9], [10] or all users [11]- [13].…”

Section: A Related Workmentioning

confidence: 99%

“…By contrast, the previous phase-rotated NOMA focused on improving the error probability performance rather than the data rate. In [13], the author proposed a constellation domain for two-user downlink NOMA to improve both the performance of the error rate and the data rate. The rotated quadrature phase shift keying (QPSK) modulation is assigned for all users, and then the in-phase component of the first user's signal and the quadrature component of the second user's signal are superposed in the constellation domain instead of the power domain.…”

Section: A Related Workmentioning

confidence: 99%

“…Moreover, no exact BER has been evaluated for phase-rotation-based NOMA. Therefore, in this study, we extend [13] to the four-users case to guarantee the trade-off between the sum rate and error performance. To utilize the concept of SSD and CI, the final transmitted signal is obtained by multiplexing the real component of the first subgroup and the imaginary component of the second subgroup.…”

Section: B Motivation and Contributionsmentioning

confidence: 99%

See 2 more Smart Citations

A Novel User Grouping in Phase Rotation Based Downlink NOMA

Lee

Shin

2022

IEEE Access

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Non-orthogonal multiple access (NOMA) is a promising candidate beyond 5G and 6G to improve spectral efficiency by sharing the same resource block with other users. However, as the number of users increases in a single NOMA cluster, not only the spectral efficiency but also the interference increases. Therefore, to ensure a trade-off between capacity and error performance in NOMA systems, this study introduces a novel downlink NOMA scheme using the phase rotation. In the system, four users can create a single NOMA cluster and are grouped into two subgroups by exploiting conventional NOMA. Within each subgroup, the symbols of two users, near user and far user, are rotated and multiplexed by the power domain. Subsequently, the final transmitted signal is obtained by multiplexing the in-phase and quadrature components of the first and second subgroups, respectively. By superposing signals from two independent subgroups, the number of successive interference cancellation (SIC) operations are reduced compared to the existing NOMA. Moreover, the analytical bit error rate (BER) for a four-user scenario is derived, and the optimal rotation angle and power allocation are proposed to minimize the BER performance. Numerical results demonstrate the improved performance of the proposed NOMA scheme over several existing schemes, such as conventional NOMA and orthogonal multiple access (OMA).

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Non-coherent short-packet communications: Novel z-domain user multiplexing

Eren

2025

Digital Signal Processing

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Non-Orthogonal Multiple Access: A Constellation Domain Multiplexing Approach

Cited by 16 publications

References 17 publications

Error Rate Analysis of NOMA: Principles, Survey and Future Directions

Error Rate Analysis of NOMA: Principles, Survey and Future Directions

A Novel User Grouping in Phase Rotation Based Downlink NOMA

Non-coherent short-packet communications: Novel z-domain user multiplexing

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