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Journal ArticleDOI: 10.1007/S11432-020-2985-8

Energy-efficient design for mmWave-enabled NOMA-UAV networks

02 Mar 2021-Science in China Series F: Information Sciences (Science China Press)-Vol. 64, Iss: 4, pp 140303
Abstract: Owing to the recent advances of non-orthogonal multiple access (NOMA) and millimeter-wave (mmWave), these two technologies are combined in unmanned aerial vehicle (UAV) networks in this paper.However, energy efficiency has become a significant metric for UAVs owning to their limited energy.Thus, we aim to maximize the energy efficiency for mmWave-enabled NOMA-UAV networks by optimizing the UAV placement, hybrid precoding and power allocation.However, the optimization problem is complicated and intractable, which is decomposed into several sub-problems.First, we solve the UAV placement problem by approximating it into a convex one.Then, the hybrid precoding with user clustering is performed to better reap the multi-antenna gain. Particularly, three schemes are proposed, where the cluster head selection algorithm is adopted while considering different equivalent channels of users.Finally, the power allocation is optimized to maximize the energy efficiency, which is converted to convex and solved via an iterative algorithm.Simulation results are provided to evaluate the performance of the proposedschemes.

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Topics: Precoding (53%), Efficient energy use (53%), Optimization problem (51%)
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22 results found


Open accessJournal ArticleDOI: 10.1016/J.CJA.2021.04.025
Xu Jiang1, Xu Jiang2, Min Sheng1, Nan Zhao2  +4 moreInstitutions (5)
Abstract: Unmanned Aerial Vehicles (UAVs) have received a wide range of attention for military and commercial applications. Enhanced with communication capability, UAVs are considered to play important roles in the Sixth Generation (6G) networks due to their low cost and flexible deployment. 6G is supposed to be an all-coverage network to provide ubiquitous connections for space, air, ground and underwater. UAVs are able to provide air-borne wireless coverage flexibly, serving as aerial base stations for ground users, as relays to connect isolated nodes, or as mobile users in cellular networks. However, the onboard energy of small UAVs is extremely limited. Thus, UAVs can be only deployed to establish wireless links temporarily. Prolonging the lifetime and developing green UAV communication with low power consumption becomes a critical challenge. In this article, a comprehensive survey on green UAV communications for 6G is carried out. Specifically, the typical UAVs and their energy consumption models are introduced. Then, the typical trends of green UAV communications are provided. In addition, the typical applications of UAVs and their green designs are discussed. Finally, several promising techniques and open research issues are also pointed out.

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10 Citations


Open accessJournal ArticleDOI: 10.1109/LWC.2020.3023253
Ran Zhang1, Xiaowei Pang1, Jie Tang2, Yunfei Chen3  +2 moreInstitutions (4)
Abstract: Unmanned aerial vehicle (UAV) can be combined with non-orthogonal multiple access (NOMA) to achieve better performance. However, jointly optimizing the location, transmit power and decoding order for NOMA-UAV networks remains difficult, due to the change of decoding order as a result of UAV mobility. In this letter, a low-complexity scheme is proposed to maximize the sum rate of NOMA-UAV networks via updating decoding order, which can be decomposed into two steps. First, the joint location and power optimization can be divided into two non-convex sub-problems, which are further approximated via successive convex optimization. Then, the decoding order is updated according to the optimized UAV location. An iterative algorithm is proposed to execute the two steps alternately. In addition, the asymptotic performance is analyzed. Simulation results demonstrate the effectiveness of the proposed scheme.

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5 Citations


Open accessJournal ArticleDOI: 10.1109/TVT.2021.3096603
Yongjun Xu1, Zhengnian Gao1, Zhengqiang Wang1, Chongwen Huang2  +2 moreInstitutions (4)
Abstract: Wireless-powered communication and reconfigurable intelligent surface (RIS) can complement each other for increasing energy utilization and spectrum efficiency by reconfiguring the surrounding radio environment, however, which has not been sufficiently studied by the existing works. In this paper, we propose a joint radio resource and passive beamforming optimization scheme for a downlink RIS-assisted wireless-powered communication network with a harvest-then-transmit protocol to improve system energy efficiency (EE). In the considered model, the single-antenna wireless devices (WDs) harvest wireless energy from a multi-antenna dedicated power station (PS) through the RIS in the downlink and transmit their independent information to a single-antenna receiver in the uplink by a time-division-multiple-access mode. Our goal is to maximize the total EE of all WDs. To make full use of the beamforming gain provided by both the PS and the RIS, we jointly optimize the active beamforming of the PS and the passive beamforming of the RIS. To deal with the challenging non-convex optimization problem with multiple coupled variables, we first consider fixing the passive beamforming, and converting the remaining radio resource allocation problem into an equivalent convex problem which is solved by using Lagrange dual theory. Then, we fix the optimized resource allocation parameters and optimize the passive beamforming of the RIS by using a semidefinite programming method. Simulation results demonstrate that the proposed algorithm achieves higher EE compared to the conventional schemes.

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Topics: Beamforming (57%), Resource allocation (54%), Spectral efficiency (53%) ... read more

4 Citations


Open accessJournal ArticleDOI: 10.1109/TWC.2021.3064365
Xiaowei Pang1, Mingqian Liu2, Nan Zhao1, Yunfei Chen3  +2 moreInstitutions (5)
Abstract: Employing unmanned aerial vehicles (UAVs) in millimeter-wave (mmWave) networks as relays has emerged as an appealing solution to assist remote or blocked communication nodes. In this case, the network security becomes a great challenge due to the presence of malicious eavesdroppers. In this paper, we perform a secrecy analysis for a UAV-based mmWave relaying network. We first investigate the relaying scheme without jamming where the UAV decodes and forwards the information from the source to the destination with malicious eavesdropping. Furthermore, to enhance the secrecy performance, we propose a cooperative jamming scheme via utilizing the destination and an external UAV to cooperatively disrupt the eavesdroppers at the two stages of relaying, respectively. Using the probability of line-of-sight (LoS) between the UAV and ground nodes, the three-dimensional (3D) antenna gain, and the Nakagami-m small-scale fading model, the secrecy outage probability (SOP) of the two schemes with and without jamming is analyzed. Closed-form expressions for the SOP of the two schemes are obtained by employing the Gauss-Chebyshev quadrature. Simulation results are presented to validate the theoretical expressions of SOP and to show the effectiveness of the proposed schemes.

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Topics: Jamming (53%)

3 Citations


Journal ArticleDOI: 10.1016/J.PHYCOM.2021.101393
Bowen Lu1, Zhulun Yang1, Kai Kang1, Zehua Yu1  +2 moreInstitutions (2)
Abstract: In this work, we analyze the effect of relaying network where unmanned aerial vehicles (UAVs) act as cache-aided relay nodes. Unmanned aerial vehicle (UAV) has high mobility, which can be flexibly scheduled when unable to communicate so that it can act as a wireless relay to assist communication. It can provide a more flexible deployment mode in different application scenarios to improve the performance of communication. What is more, how to transform the dynamic characteristics of UAVs into channel characteristics is also a challenge. To be more specific, UAVs act as decoded-and-forward (DF) relays to assist the wireless communication between the source and destination, and the speed and flying height remains unchanged. The UAVs are equipped with a wireless cache, which can provide reliable services and expand the channel capacity to reduce the outage probability of the network. Experimental and simulation results verify the effect of UAVs with cache on the outage performance in relaying networks.

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Topics: Cache (54%), Relay (52%), Wireless (51%)

2 Citations


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38 results found


Open accessJournal ArticleDOI: 10.1109/MCOM.2016.7470933
Yong Zeng1, Rui Zhang1, Teng Joon Lim1Institutions (1)
Abstract: Wireless communication systems that include unmanned aerial vehicles promise to provide cost-effective wireless connectivity for devices without infrastructure coverage. Compared to terrestrial communications or those based on high-altitude platforms, on-demand wireless systems with low-altitude UAVs are in general faster to deploy, more flexibly reconfigured, and likely to have better communication channels due to the presence of short-range line-of-sight links. However, the utilization of highly mobile and energy-constrained UAVs for wireless communications also introduces many new challenges. In this article, we provide an overview of UAV-aided wireless communications, by introducing the basic networking architecture and main channel characteristics, highlighting the key design considerations as well as the new opportunities to be exploited.

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Topics: Fixed wireless (64%), Wi-Fi array (64%), Key distribution in wireless sensor networks (61%) ... read more

2,234 Citations


Journal ArticleDOI: 10.1287/MNSC.13.7.492
Werner Dinkelbach1Institutions (1)
01 Mar 1967-Management Science
Abstract: The main purpose of this paper is to delineate an algorithm for fractional programming with nonlinear as well as linear terms in the numerator and denominator. The algorithm presented is based on a theorem by Jagannathan Jagannathan, R. 1966. On some properties of programming problems in parametric form pertaining to fractional programming. Management Sci.12 609--615. concerning the relationship between fractional and parametric programming. This theorem is restated and proved in a somewhat simpler way. Finally, it is shown how the given algorithm can be related to the method of Isbell and Marlow Isbell, J. R., W. H. Marlow. 1956. Attrition games. Naval Res. Logist. Quart.3 71--93. for linear fractional programming and to the quadratic parametric approach by Ritter Ritter, K. 1962. Ein Verfahren zur Losung parameterabhangiger, nichtlinearer Maximum-Probleme. Unternehmensforschung, Band 6, S. 149--166.. The Appendix contains a numerical example.

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2,215 Citations


Open accessJournal ArticleDOI: 10.1109/JSAC.2017.2725519
Zhiguo Ding1, Xianfu Lei2, George K. Karagiannidis3, Robert Schober4  +2 moreInstitutions (6)
Abstract: Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth-generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The key idea behind NOMA is to serve multiple users in the same resource block, such as a time slot, subcarrier, or spreading code. The NOMA principle is a general framework, and several recently proposed 5G multiple access schemes can be viewed as special cases. This survey provides an overview of the latest NOMA research and innovations as well as their applications. Thereby, the papers published in this special issue are put into the context of the existing literature. Future research challenges regarding NOMA in 5G and beyond are also discussed.

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Topics: Noma (55%), Electronic mail (50%)

1,201 Citations


Open accessPosted Content
Zhiguo Ding1, Xianfu Lei2, George K. Karagiannidis3, Robert Schober4  +2 moreInstitutions (6)
Abstract: Non-orthogonal multiple access (NOMA) is an essential enabling technology for the fifth generation (5G) wireless networks to meet the heterogeneous demands on low latency, high reliability, massive connectivity, improved fairness, and high throughput. The key idea behind NOMA is to serve multiple users in the same resource block, such as a time slot, subcarrier, or spreading code. The NOMA principle is a general framework, and several recently proposed 5G multiple access schemes can be viewed as special cases. This survey provides an overview of the latest NOMA research and innovations as well as their applications. Thereby, the papers published in this special issue are put into the content of the existing literature. Future research challenges regarding NOMA in 5G and beyond are also discussed.

... read more

Topics: Noma (55%)

1,005 Citations


Open accessJournal ArticleDOI: 10.1109/LCOMM.2016.2633248
Jiangbin Lyu1, Yong Zeng1, Rui Zhang1, Teng Joon Lim1Institutions (1)
Abstract: In terrestrial communication networks without fixed infrastructure, unmanned aerial vehicle-mounted mobile base stations (MBSs) provide an efficient solution to achieve wireless connectivity. This letter aims to minimize the number of MBSs needed to provide wireless coverage for a group of distributed ground terminals (GTs), ensuring that each GT is within the communication range of at least one MBS. We propose a polynomial-time algorithm with successive MBS placement, where the MBSs are placed sequentially starting on the area perimeter of the uncovered GTs along a spiral path toward the center, until all GTs are covered. Numerical results show that the proposed algorithm performs favorably compared with other schemes in terms of the number of required MBSs as well as time complexity.

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Topics: Base station (51%), Mobile telephony (50%)

614 Citations


Performance
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No. of citations received by the Paper in previous years
YearCitations
20221
202120
20201