Outage Performance of Multi-Antenna Mobile UAV-Assisted NOMA Relay Systems Over Nakagami-<i>m</i> Fading Channels

Hoang, Tran Manh; Nguyen, Ba Cao; Kim, Taejoon

doi:10.1109/access.2020.3041311

Cited by 33 publications

(15 citation statements)

References 34 publications

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“…Asymptotic Outage Probability at D 2 . The asymptotic OP for P D 2 is expressed the same as P D 1 , whose exact analysis is portrayed in (27); we have…”

Section: Asymptotic Outage Probability At D 1 Applying Thementioning

confidence: 99%

“…Specifically, the asymptotic analysis in the high signal-to-noise-ratio (SNR) regions is carried out by invoking a high SNR slope and high SNR power offset. In [27], the authors investigated the impact of residual hardware impairments on the performance of UAV-aided NOMA multiway relay networks by deriving the approximate analytical expressions for the achievable sum rate. Specifically, the asymptotic analysis in the high signal-to-noiseratio (SNR) regions is carried out by invoking a high SNR slope and high SNR power offset.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Power-Splitting Relaying Protocol for SWIPT with Multiple UAVs in Downlink NOMA-IoT Networks

Tran

Phan

Vien

2022

Wireless Communications and Mobile Computing

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Unmanned aerial vehicle (UAV) communication and non-orthogonal multiple access (NOMA) are two promising technologies for wireless 5G networks and beyond. The UAVs can be used as flying base stations to form line-of-sight communication links to the Internet of things devices (IDs) and to enhance the performance of usual terrestrial cellular networks. Moreover, the UAVs can also be deployed as flying relay nodes for forwarding data from a base station (BS) to the IDs. On the other hand, non-orthogonal resource sharing for many concurrent users is exploited in NOMA, thus improving spectrum efficiency (SE) and supporting massive connections. The NOMA combined with energy harvesting (EH) in an amplify-and-forward (AF) with cooperative UAV systems is researched. Specifically, the UAVs act as rotary-wing relays to forward data from the BSs to two IDs. This paper focuses on the analysis of outage probabilities (OPs), system throughput, and energy efficiency (EE) for two IDs. Besides, we also do the asymptotic analysis of OPs at high signal-to-noise ratios (SNRs). Furthermore, this paper also inspects the impacts of the UAV-based relaying on the OP, system throughput, and EE of the proposed NOMA scheme. The derived asymptotic expansions show that the suggested model can enhance user fairness and the analytical results match the simulation results.

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“…Asymptotic Outage Probability at D 2 . The asymptotic OP for P D 2 is expressed the same as P D 1 , whose exact analysis is portrayed in (27); we have…”

Section: Asymptotic Outage Probability At D 1 Applying Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Power-Splitting Relaying Protocol for SWIPT with Multiple UAVs in Downlink NOMA-IoT Networks

Tran

Phan

Vien

2022

Wireless Communications and Mobile Computing

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show abstract

“…Sine X and Y are exponential random variables, i.e., X ∼ CN (0, λ x ), Y ∼ CN (0, λ y ); Z = aX + bY, where a and b are two positive real numbers. The PDF of Z, f Z (z), is determined as [7] f…”

Section: A Outage Probability (Op)mentioning

confidence: 99%

“…The main idea of the NOMA technique is to support the non-orthogonal identification of radio resources among users. It can be classified into two main categories: power-domain NOMA [7] and code-domain NOMA [8]. Many works in the literature have combined NOMA with other novel technologies to create new systems that meet higher performance requirements.…”

Section: Introductionmentioning

confidence: 99%

Analysis of FD-NOMA Cognitive Relay System With Interference From Primary User Under Maximum Average Interference Power Constraint

Toan¹,

Van²,

Hoang³

et al. 2021

IEEE Access

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In this paper, we consider a non-orthogonal multiple access (NOMA) based underlay cognitive radio (CR) system consisting of a source, two destinations, and a relay in the secondary network. The source communicates with two destinations using the NOMA technique via the assistance of the relay operating in full-duplex (FD) mode. The operations of all secondary nodes are affected by the interference from a primary transmitter. Meanwhile, secondary transmitters must adjust their transmission powers so that the interference probability to a primary receiver is always less than a given value. Under this average interference power constraint, we propose the maximum average interference power (MAIP) constraint for the relay to achieve its highest possible average transmit power. Based on the MAIP constraint, we derive the exact closed-form expression of the outage probabilities and ergodic capacities at two destination users. Monte-Carlo simulations verify the accuracy of the obtained mathematical expressions. Numerical results show that the considered NOMA-FD-CR relay system's performance is significantly affected by the interference from the primary transmitter and the maximum tolerable interference of the primary receiver. Additionally, using the MAIP constraint at the relay substantially improves the quality of the received signal at the far user with a slight reduction in the signal quality at the near user and fulfills the interference constraint without needing the instantaneous channel state information (CSI).

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“…The authors of [10] derive closed-form expressions for outage probability and sum-rate of users in a cooperative NOMA system over Rayleigh fading channels and propose a relay selection scheme to satisfy the quality of service (QoS) for the users. Deriving outage probability for users in NOMA systems with Nakagami-m fading channels is considered in various frameworks and for different purposes in [11]- [15]. For example, the authors of [11] derive outage probability of downlink NOMA users under a fixed power allocation.…”

Section: Introductionmentioning

confidence: 99%

Outage Balancing in Downlink NOMA Over Nakagami-m Fading Channels

et al. 2021

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In this paper, we investigate joint optimization of power allocation factors (PAFs) and decoding order of users in the downlink of a non-orthogonal multiple access (NOMA) system over Nakagami-m fading channels. The objective is to guarantee fairness among the users in terms of outage probability (or its complement success probability). To this end, we maximize the minimum success probability (Max-MSP) among the users when only statistical channel state information (CSI) is available at the transmitter side. We solve such a problem by first proving that at the optimal solution, all the users have a common success probability (CSP), and then proposing an efficient algorithm for finding CSP of the users. The optimal PAFs and optimal decoding order are derived in closed form based on the CSP and statistical CSI of the users. It is proved that the proposed algorithm always converges to a unique optimal solution. Furthermore, we show that in contrast to Rayleigh fading channels, in Nakagami-m fading channels, the optimal decoding order not only depends on the average signal-to-noise ratio (SNR) of each user but also depends on the variance of the SNR and data rate of that user.INDEX TERMS Non-orthogonal multiple access (NOMA), Nakagami-m fading, outage probability, fairness, power allocation factor, decoding order.

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Outage Performance of Multi-Antenna Mobile UAV-Assisted NOMA Relay Systems Over Nakagami-m Fading Channels

Cited by 33 publications

References 34 publications

On the Power-Splitting Relaying Protocol for SWIPT with Multiple UAVs in Downlink NOMA-IoT Networks

On the Power-Splitting Relaying Protocol for SWIPT with Multiple UAVs in Downlink NOMA-IoT Networks

Analysis of FD-NOMA Cognitive Relay System With Interference From Primary User Under Maximum Average Interference Power Constraint

Outage Balancing in Downlink NOMA Over Nakagami-m Fading Channels

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