Joint Spectrum and Power Allocation for NOMA Enhanced Relaying Networks

Wang, Qiang; Zhao, Feng

doi:10.1109/access.2019.2900225

Cited by 76 publications

(21 citation statements)

References 19 publications

(34 reference statements)

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“…Since both the left-hand side and the right-hand side are nonnegative numbers, it is valid. Likewise, no contradiction takes place in (21), (22) and (23). Hence, both SIC constraints are adequate and this case holds.…”

Section: Appendix Bmentioning

confidence: 73%

“…• Case 1: λ 3 = 0 and λ 4 = 0. We need to check if inconsistency occurs among (20), (21), (22), and (23). For this case, we rearrange the terms in (20) to obtain g 1 λ 1 = P 4 g 2 g 4 λ 2 +λ 5 .…”

Section: Appendix Bmentioning

confidence: 99%

“…Furthermore, the spectral efficiency of amplify-and-forward (AF)-based NOMA cooperation is investigated in [20], while a similar problem is tackled for decode-and-forward (DF)-based NOMA cooperation as well in [22]. The problem of joint resource allocation, involving the subcarrier pair, subcarrier-user assignment, and power levels, is examined to maximize the network throughput in [21]. Typically, it is formulated as a mixed-integer nonlinear programming problem, which is then solved via a special divide-and-conquer strategy.…”

Section: Introductionmentioning

confidence: 99%

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Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

Huang

Lee

Sou

2020

IEEE Open J. Commun. Soc.

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Non-orthogonal multiple access (NOMA)-based diamond relaying (NDR) is an efficient approach for combining NOMA and relaying techniques in such a way as to enhance the achievable rate from the source to the destination in the network. This paper examines the problem of joint power allocation among all the transmission phases during the operation of such networks. Based on the Karush-Kuhn-Tucker (KKT) condition and the second-order sufficient condition (SOSC), at least the local optimal solution is derived and analyzed. In addition, a new protocol for NDR networks based on cooperative communications is introduced and the associated joint power-allocation problem is examined. It is shown that this cooperative NDR (C-NDR) network further improves the achievable rate in some typical placements of the relays. Simulation results verify the correctness of the deviation and confirm the effectiveness of the proposed joint power-allocation method for both NDR and C-NDR networks. INDEX TERMS Non-orthogonal multiple access (NOMA), relay networks, NOMA-based diamond relaying (NDR), cooperative communications, Karush-Kuhn-Tucker (KKT) condition, second-order sufficient condition (SOSC), joint power allocation, achievable rate.

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Section: Appendix Bmentioning

confidence: 73%

Section: Appendix Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

Huang

Lee

Sou

2020

IEEE Open J. Commun. Soc.

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“…In this case, the weight maps exploited for the fusion process are represented by a saliency map (computed in the Achanta's way), a saturation map and a contrast map. Similarly, in Reference [82], the authors propose a method to perform underwater image restoration through multiscale multiple images fusion. As in the previous cases, the original image is first processed to correct color and to enhance the contrast properties.…”

Section: Image Enhancement and Restorationmentioning

confidence: 99%

The Use of Saliency in Underwater Computer Vision: A Review

Reggiannini

Moroni

2020

Remote Sensing

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Underwater survey and inspection are tasks of paramount relevance for a variety of applications. They are usually performed through the employment of optical and acoustic sensors installed aboard underwater vehicles, in order to capture details of the surrounding environment. The informative properties of the data are systematically affected by a number of disturbing factors, such as the signal energy absorbed by the propagation medium or diverse noise categories contaminating the resulting imagery. Restoring the signal properties in order to exploit the carried information is typically a tough challenge. Visual saliency refers to the computational modeling of the preliminary perceptual stages of human vision, where the presence of conspicuous targets within a surveyed scene activates neurons of the visual cortex, specifically sensitive to meaningful visual variations. In relatively recent years, visual saliency has been exploited in the field of automated underwater exploration. This work provides a comprehensive overview of the computational methods implemented and applied in underwater computer vision tasks, based on the extraction of visual saliency-related features.

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“…In the field of wireless communication, relay networks acquired much consideration to provide better coverage and throughput [1,2]. For the efficient utilization of wireless resources to provide good quality of services to the users, resource allocation is considered as an important factor [3,4]. The problem of outage probability and ergodic capacity was studied in energy harvesting relay networks [5].…”

Section: Introductionmentioning

confidence: 99%

Joint Power Allocation and Link Selection for Multi-Carrier Buffer Aided Relay Network

et al. 2019

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In this paper, we present a joint power allocation and adaptive link selection protocol for an orthogonal frequency division multiplexing (OFDM)-based network consists of one source node i.e., base station (BS), one destination node i.e., (MU) and a buffer aided decode and forward (DF) relay node. Our objective is to maximize the average throughput of the system via power loading over different subcarriers at source and relay nodes. A separate power budget is assumed at each transmitting node to make the system more practical. In order to form our solution more tractable, a decomposition framework is implemented to solve the mixed integer optimization problem. Further, less complex suboptimal approaches have also been presented and simulation results are provided to endorse the efficiency of our designed algorithms.Buffer aided relaying (BAR) emerged as a new paradigm for the wireless communication systems and has provided freedom to the link selection, i.e., the choice to choose a particular hop for transmission in a given time slot [9]. With this addition, the resource allocation problem becomes more challenging and is coupled with the link selection. The optimization techniques designed for memoryless relaying nodes cannot be applied for BAR transmission. Thus, the problem of power allocation and link selection for the BAR has received significant attention in the research community [10][11][12][13][14][15][16][17][18][19][20]. Considering a full-duplex network, power allocation at the source and relay node was studied in [10]. Authors maximized the source arrival rate under the assumption of imperfect self-interference cancellation and statistical delay constraints. For the underlay cognitive radio network with buffer aided DF relay, an adaptive link selection scheme was presented in [11]. A closed-form expression for the data rate was derived by assuming peak power and interference constraints at the secondary nodes. The authors in [12] considered a system where multiple source nodes are communicating with a single destination through a common BAR. Under the total transmit power constraint at each node, this work presented a link selection and a power allocation strategy.The problem of cross-layer resource allocation considering asymmetric time duration over two hops was investigated in [13]. The work in [14] proposed different BAR schemes under full-duplex (FD) relay transmission with self-interference cancellation (SIC) capability at the relaying node. The results showed the considerable gains of the proposed scheme over the conventional FD relay transmission. Further, the authors in [15] studied the security and the delay issues in the buffer enhanced dual-hop transmission. The relay selection schemes for links with equal weights have recently been explored in [16]. Depending on the status of the buffer at each relaying node, the authors in [17] proposed a max-link selection analysis framework. With the Markov chain approach, analytical expressions for the outage probability, the average bit error rate, a...

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Joint Spectrum and Power Allocation for NOMA Enhanced Relaying Networks

Cited by 76 publications

References 19 publications

Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation

The Use of Saliency in Underwater Computer Vision: A Review

Joint Power Allocation and Link Selection for Multi-Carrier Buffer Aided Relay Network

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