Non-Orthogonal Multiple Access (NOMA) With Multiple Intelligent Reflecting Surfaces

@article{Cheng2021NonOrthogonalMA,
  title={Non-Orthogonal Multiple Access (NOMA) With Multiple Intelligent Reflecting Surfaces},
  author={Yanyu Cheng and Kwok Hung Li and Yuanwei Liu and Kah Chan Teh and George K. Karagiannidis},
  journal={IEEE Transactions on Wireless Communications},
  year={2021},
  volume={20},
  pages={7184-7195}
}
In this paper, non-orthogonal multiple access (NOMA) networks assisted by multiple intelligent reflecting surfaces (IRSs) with discrete phase shifts are investigated, in which each user device (UD) is served by an IRS to improve the quality of the received signal. Two scenarios are considered according to whether there is a direct link between the base station (BS) and each UD, and the outage performance is analyzed for each of them. Specifically, the asymptotic expressions for the upper and… 

Figures and Tables from this paper

Co-Channel Interference Effects on Downlink Power-Domain Non-Orthogonal Multiple Access
TLDR
Analytical, asymptotic, and Monte-Carlo based intensive computer simulation results reveal that co-channel interference causes coding gain losses on free-interference case, utilized as a benchmark, in high signal-to-noise-ratios.
Reconfigurable Intelligent Surfaces for Wireless Communications: Overview of Hardware Designs, Channel Models, and Estimation Techniques
TLDR
An overview and taxonomize the latest advances in RIS hardware architectures as well as the most recent developments in the modeling of RIS unit elements and RIS-empowered wireless signal propagation, which constitute a prerequisite step for the optimized incorporation of RISs in future wireless networks.
Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface Assisted NOMA Networks
TLDR
The outage probability of STAR-RIS-NOMA outperforms that of STAR -RIS assisted orthogonal multiple access (OMA) and conventional cooperative communication systems; with the increasing of reflecting elements K and Rician factor κ, the STAR- RIS- NOMA networks are capable of attaining the enhanced performance.

References

SHOWING 1-10 OF 58 REFERENCES
Intelligent Reflecting Surface Assisted Non-Orthogonal Multiple Access
TLDR
Simulation results show that the IRS-assisted downlink NOMA system can enhance the rate performance significantly, compared to traditional N OMA without IRS and traditional orthogonal multiple access with/without IRS, and the rate degradation due to the IRS’s finite phase resolution is slight.
Power Efficient IRS-Assisted NOMA
TLDR
Simulation results show that the proposed IRS-assisted MISO system outperforms the MISO case without IRS, and the hybrid NOMA transmission scheme always achieves better performance than orthogonal multiple access.
Analysis and Optimization of Outage Probability in Multi-Intelligent Reflecting Surface-Assisted Systems
TLDR
This letter analyze and optimize the outage probability of the multi-IRS-assisted system in the slow fading scenario for the non-LoS (NLoS) components, and characterize the asymptotically optimal outage probability in the high signal-to-noise ratio (SNR) regime, and show that it decreases with the powers of the LoS components.
Cooperative Non-orthogonal Multiple Access With Simultaneous Wireless Information and Power Transfer
TLDR
Analytical results demonstrate that the use of SWIPT will not jeopardize the diversity gain compared to the conventional NOMA and confirm that the opportunistic use of node locations for user selection can achieve low outage probability and deliver superior throughput in comparison to the random selection scheme.
Intelligent Reflecting Surface for Downlink Non-Orthogonal Multiple Access Networks
TLDR
This paper considers the downlink transmit power minimization problem for a IRS- empowered non-orthogonal multiple access (NOMA) network by jointly optimizing the transmit beamformers at the BS and the phase-shift matrix at the IRS and develops a novel difference-of-convex (DC) programming algorithm to solve the resulting non- Convex quadratic programs efficiently.
Reconfigurable Intelligent Surface Aided NOMA Networks
TLDR
A system for serving paired power-domain non-orthogonal multiple access (NOMA) users by designing the passive beamforming weights at the RISs is conceived, and the proposed RIS-aided NOMA network has superior network performance compared to its orthogonal counterpart.
MISO Wireless Communication Systems via Intelligent Reflecting Surfaces : (Invited Paper)
TLDR
Simulation results reveal that deploying large-scale IRSs in wireless systems is more efficient than increasing the antenna array size at the AP for enhancing both the spectral and the energy efficiency.
A New Evaluation Criterion for Non-Orthogonal Multiple Access in 5G Software Defined Networks
TLDR
In a wireless downlink scenario with user pairing, the developed analytical results show that NOMA can outperform TDMA not only in Terms of the sum rate but also in terms of each user's individual rate, particularly when the difference between the users' channels is large.
Secure MIMO Transmission via Intelligent Reflecting Surface
TLDR
An alternating optimization (AO) algorithm is proposed to jointly optimize the transmit covariance R at transmitter and phase shift coefficient Q at IRS by fixing the other as a constant to maximize the secrecy rate of this channel.
Weighted Sum-Rate Maximization for Intelligent Reflecting Surface Enhanced Wireless Networks
TLDR
This work focuses on the downlink of an IRSaided multiuser multiple-input single-output (MISO) system and proposes an efficient algorithm with closed-form solutions for the passive beamforming, which is applicable to both the discrete phase- shift IRS and the continuous phaseshift IRS.
...
1
2
3
4
5
...