Performance Analysis for Downlink NOMA Over $\alpha$-$\mu$ Generalized Fading Channels

Alqahtani, Adel S. A.; Alsusa, Emad; Al-Dweik, Arafat; Al‐Jarrah, Mohammad

doi:10.1109/tvt.2021.3082917

Cited by 35 publications

(18 citation statements)

References 24 publications

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“…In the scenarios where uplink NOMA is profitably employed, such approximation is verified, i.e., the spacing is sufficiently wide; as a matter of fact, this is the condition that allows to better discriminate among simultaneously received signals. Given this assumption holds, observe that it is possible to leverage upon a further approximation, namely, (2) (•) that appears in (23) is replaced by 2 (•), the CDF of the unordered random variable 2 . This leads to…”

Section: Bmentioning

confidence: 99%

“…Due to the complex nature of the analysis, the authors exclusively considered the circumstance of two superimposed users for mathematical tractability. In [23], the channel model was the generalized -fading and, also in this work, the SIC decoding order was fixed; here too, the analysis was limited to the circumstance of two or at the most three simultaneously active users.…”

Section: Introductionmentioning

confidence: 99%

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Fundamental Limits on the Uplink Performance of the Dynamic-Ordered SIC Receiver

Lusvarghi

Merani

2022

IEEE Access

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Due to the rapid and widespread growth of the Internet-of-Things (IoT) paradigm, present days witness an exponential increase in the number of connected devices. In this regard, the orthogonal transmission techniques featured by conventional 4G and 5G systems can only support a limited number of simultaneously active users, due to their low spectral efficiency and poorly flexible resource allocation. To overcome such limitations, the 6G framework will include novel Next Generation Multiple Access (NGMA) solutions that will efficiently and flexibly connect a significantly larger number of devices over the same portion of spectrum. Under the NGMA umbrella, the Power-Domain Non-Orthogonal Multiple Access (PD-NOMA) technology is able to accommodate multiple users on the same frequencies by carefully assigning different power levels to the active users and employing Successive Interference Cancellation (SIC) receivers. In this work, we put forth a novel analytical approach to evaluate the performance that PD-NOMA achieves on the uplink of a single cell when a dynamic-ordered SIC receiver is considered. With respect to other existing works, the fundamental limits on the system performance are assessed analytically for an arbitrary number of simultaneously transmitting users, and both the case of Rayleigh and lognormal-shadowed Rayleigh fading are examined. The closed-form expressions presented in this work, whose correctness and excellent accuracy are validated through Monte Carlo simulations, disclose the impact of lognormal shadowing and an increasingly larger number of active users on the PD-NOMA performance.

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Section: Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fundamental Limits on the Uplink Performance of the Dynamic-Ordered SIC Receiver

Lusvarghi

Merani

2022

IEEE Access

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“…To perform a similar operation, the authors in [22], [23] have applied the relay technique to enhance weak user performance. Regarding a performance analysis for downlink nonorthogonal multiple accesses (DL-NOMA) systems where the channel gains follow the 𝛼 − 𝜇fading distribution in [24], [25]. The authors considered bit error rate (BER), and ergodic capacity (EC).…”

Section: Introductionmentioning

confidence: 99%

Outage performance analysis of NOMA under fading channels in presence of imperfect SIC

Nguyen

Vozňák

et al. 2022

Bulletin EEI

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The introduction of 5th and 6th-generation wireless networks has elevated the demand for huge device connectivity, spectral efficacy, and improved signal quality. The non-orthogonal multiple access technique (NOMA) has been demonstrated to be a candidate to address these requirements. NOMA can assist many users using the same resource block by varying the assigned power levels fairness to the users. To perform this, the NOMA technique superimposes the signals from both the users and transmits them to the receiver. On the receiver side, it performs successive interference cancellation (SIC) techniques to separate the respective signals. Meanwhile, the fading channels also play a major role in deciding the quality of the signal that is being transmitted. In our paper, a NOMA system is considered in presence of two users having fading channels. The closed-form expressions are derived for outage probability and throughput of the system in presence of perfect SIC and imperfect SIC. The expressions are numerically analyzed by varying various parameters such as fading channels, power level coefficients, and the number of antennas at the receivers. The obtained results demonstrate that each parameter plays a major role in enhancing the quality of each user's signal and the outage performance of the system.

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“…The outage analysis and sum rate is presented in Sharma et al, 29 considering diversity combining techniques such as MRC, equal gain combining (EGC), and selection combining (SC) over

η - μ

fading for a multiuser DL‐NOMA system. The outage performance, BER, and ergodic capacity of the NOMA system are investigated in Alqahtani et al 30 over the generalized

α - μ

fading distribution.…”

Section: Introductionmentioning

confidence: 99%

Performance of NOMA‐assisted MRC receivers in presence of imperfect SIC and CSI errors

Soni

Jain

Rawal

et al. 2022

Int J Communication

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Summary In this paper, we analyze the performance of maximum‐ratio combining (MRC) receivers for single‐input multiple‐output (SIMO) non‐orthogonal multiple access (NOMA) system. We explore the aforesaid system performance in presence of impairments like imperfect channel state information (CSI) and successive interference cancellation (SIC) errors. In general, receive diversity provides diversity gain and helps to maintain quality of service (QoS), while the NOMA system achieves higher spectral efficiency compared to orthogonal multiple access (OMA). Power‐domain NOMA system transmits superimposed‐coded signal, which utilize SIC detection method at the receiving users. Here, we derive the closed‐form expression of the average bit error rate (BER) for the MRC‐based NOMA system. We also analyze the performance of the system in high signal‐to‐noise ratio (SNR) regime through derived asymptotic expression. Furthermore, the outage probability, diversity order, and sum rate comparison between NOMA and OMA system are also presented. Simulation results also validate the derived theoretical expressions and confirm the diversity gain achieved for the considered system.

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Performance Analysis for Downlink NOMA Over $\alpha$-$\mu$ Generalized Fading Channels

Cited by 35 publications

References 24 publications

Fundamental Limits on the Uplink Performance of the Dynamic-Ordered SIC Receiver

Fundamental Limits on the Uplink Performance of the Dynamic-Ordered SIC Receiver

Outage performance analysis of NOMA under fading channels in presence of imperfect SIC

Performance of NOMA‐assisted MRC receivers in presence of imperfect SIC and CSI errors

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