NOMA-Assisted Machine-Type Communications in UDN: State-of-the-Art and Challenges

Elbayoumi, Mohammed; Kamel, Mahmoud; Hamouda, Walaa; Youssef, Amr M.

doi:10.1109/comst.2020.2977845

Cited by 106 publications

(40 citation statements)

References 136 publications

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“…• If the link schedule is not fixed, we can consider the same fading penalty f u = f for all links, in order to jointly optimize it with the scheduling coordination of Section III-B. The fading penalty impacts the average system rate of a given link schedule according to (37) via the average rater u (f u ) (16). Hence, our greedy scheduling Algorithm 2 can be combined with a line search over f to maximize the average system rate.…”

Section: Transmission Rate Adaptationmentioning

confidence: 99%

“…In mobile wireless communications, the spatial density of concurrently active and thereby interfering links is continuously increasing. Novel concepts, such as, machine to machine (M2M) and vehicle to everything (V2X) communications, as well as, innovative technologies, such as, distributed massive multiple-input multiple-output (MIMO) [9] and dynamic distributed antenna systems (dDASs) [10], cellfree massive MIMO [11,12], transmissions in the millimeter wave (mmWave) band [13,14], and non-orthogonal multiple access (NOMA) [15,16], are contributing to this trend. In such dense scenarios, the interference between simultaneously active links has a significant impact on the reliability of the transmissions.…”

Section: Introductionmentioning

confidence: 99%

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Reliable Multi-Point Transmissions Over Directional MISO TWDP Fading Channels

Schwarz

Rupp

2021

IEEE Trans. Veh. Technol.

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In this paper, we consider wireless transmissions over directional multiple-input single-output (MISO) two wave with diffuse power (TWDP) fading channels, subject to interference over the same type of channel. TWDP fading is known to exhibit an outage behavior that can be even worse than Rayleigh fading and has experimentally been observed in a number of vehicular channel measurement campaigns. To enhance the reliability of multi-point transmissions over MISO TWDP fading channels, we propose a zero-forcing based coordinated beamforming scheme, for which we can analytically characterize and optimize the outage probability of the multi-point transmissions. Based on the developed outage expressions, we furthermore propose a greedy coordinated scheduling approach that attempts to maximize the achievable rate of the system. Finally, we propose a transmission rate adaptation scheme for fixed size packet transmissions, which supports reliable and at the same time resource efficient multi-point transmissions.

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Section: Transmission Rate Adaptationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliable Multi-Point Transmissions Over Directional MISO TWDP Fading Channels

Schwarz

Rupp

2021

IEEE Trans. Veh. Technol.

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“…3) Comparison of OMA and hybrid NOMA: By following the same steps as in the previous subsection, it is straightforward to show that the hybrid NOMA solution shown in (7) outperforms OMA. The comparison between OMA and the hybrid NOMA solution shown in ( 6) is challenging and will be focused on in the following.…”

Section: B Optimizing T Nmentioning

confidence: 99%

Unveiling the Importance of SIC in NOMA Systems—Part II: New Results and Future Directions

2020

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In most existing works on non-orthogonal multiple access (NOMA), the decoding order of successive interference cancellation (SIC) is prefixed and based on either the users' channel conditions or their quality of service (QoS) requirements. A recent work on NOMA assisted semi-grant-free transmission showed that the use of a more sophisticated hybrid SIC scheme can yield significant performance improvements. This letter illustrates how the concept of hybrid SIC can be generalized and applied to different NOMA applications. We first use NOMA assisted mobile edge computing (MEC) as an example to illustrate the benefits of hybrid SIC, where new results for offloading energy minimization are presented. Then, future directions for generalizing hybrid SIC with adaptive decoding order selection as well as its promising applications are discussed.

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“…Based on this situation, many new technologies have emerged, such as non-orthogonal multiple access (NOMA), multiple-input multiple-output (MIMO), millimeter wave (mm Wave) communication, etc. [4]. As an effective way to improve spectral efficiency, NOMA has gained wide attention from scholars in recent years.…”

Section: Introductionmentioning

confidence: 99%

A Q-Learning-Based Resource Allocation for Downlink Non-Orthogonal Multiple Access Systems Considering QoS

Zhai

Bolić

et al. 2021

IEEE Access

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As a technology that can accommodate more users and significantly improve spectral efficiency, non-orthogonal multiple access (NOMA) has attracted the attention of many scholars in recent years. The basic idea of NOMA is to implement multiple access in the power domain and decode the desired signal via successive interference cancellation (SIC). However, the resource allocation problem in such NOMA system is non-convex. It is difficult to directly solve this optimization problem through conventional methods. As such, we propose to apply a reinforcement learning (RL) approach based on cooperative Qlearning to solve the resource allocation problem in multi-antenna downlink NOMA systems. First, we formulate the resource allocation process as a sum rate maximization problem, subject to the power budget constraints and quality of service (QoS) condition. Second, we design a reward function to improve the sum rate while meeting the power and capacity constraints. Multiple Q-tables are created and cooperatively updated to get the optimal beamforming matrix. Then, we analyze the convergence of our proposed RL based power allocation method. Our simulations show that the proposed power allocation scheme yields excellent performance in terms of sum rate, energy efficiency, and spectral efficiency. INDEX TERMS NOMA, power allocation, reinforcement learning, sum rate, spectral efficiency.

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NOMA-Assisted Machine-Type Communications in UDN: State-of-the-Art and Challenges

Cited by 106 publications

References 136 publications

Reliable Multi-Point Transmissions Over Directional MISO TWDP Fading Channels

Reliable Multi-Point Transmissions Over Directional MISO TWDP Fading Channels

Unveiling the Importance of SIC in NOMA Systems—Part II: New Results and Future Directions

A Q-Learning-Based Resource Allocation for Downlink Non-Orthogonal Multiple Access Systems Considering QoS

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