human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "wireless powered communications with non orthogonal multiple access"
  Abstract: We study a wireless-powered uplink communication system with non-orthogonal multiple access (NOMA), consisting of one base station and multiple energy harvesting users. More specifically, we focus on the individual data rate optimization and fairness improvement and we show that the formulated problems can be optimally and efficiently solved by either linear programming or convex optimization. In the provided analysis, two types of decoding order strategies are considered, namely  fixed decoding order  and  time sharing . Furthermore, we propose an efficient greedy algorithm, which is suitable for the practical implementation of the time-sharing strategy. The simulation results illustrate that the proposed scheme outperforms the baseline orthogonal multiple access scheme. More specifically, it is shown that the NOMA offers a considerable improvement in throughput, fairness, and energy efficiency. Also, the dependence among system throughput, minimum individual data rate, and harvested energy is revealed, as well as an interesting tradeoff between rates and energy efficiency. Finally, the convergence speed of the proposed greedy algorithm is evaluated, and it is shown that the required number of iterations is linear with respect to the number of users.

Connected through hyperedge HE-1 (induced by source paper "interplay between noma and other emerging technologies a survey"):
  with members:
    - "secure relaying in non orthogonal multiple access trusted and untrusted scenarios"
    - "securing downlink massive mimo noma networks with artificial noise"
    - "lens based millimeter wave reconfigurable antenna noma"
    - "what role can noma play in massive mimo"
    - "noma an information theoretic perspective"
    - "joint power and time allocation for noma mec offloading"
    - "multi beam noma for hybrid mmwave systems"
    - "exploiting full half duplex user relaying in noma systems"

Connected through hyperedge HE-2 (induced by source paper "uav data collection over noma backscatter networks uav altitude and trajectory optimization"):
  with members:
    - "3 d placement of an unmanned aerial vehicle base station for maximum coverage of users with different qos requirements"
    - "ultra reliable uav communication using altitude and cooperation diversity"
    - "efficient 3d placement of a uav using particle swarm optimization"
    - "lora backscatter enabling the vision of ubiquitous connectivity"
    - "backscatter communications for internet of things theory and applications"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"

Connected through hyperedge HE-3 (induced by source paper "on the fairness performance of noma based wireless powered communication networks"):
  with members:
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "noma based energy efficient wireless powered communications"
    - "spectral and energy efficient wireless powered iot networks noma or tdma"
    - "non orthogonal multiple access schemes in wireless powered communication networks"
    - "wireless powered communication opportunities and challenges"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-4 (induced by source paper "channel capacity enhancement of swipt based cnoma downlink transmission with orbital angular momentum over rician fading channel"):
  with members:
    - "on the performance of noma based cooperative relaying systems over rician fading channels"
    - "millimeter wave communications with oam sm scheme for future mobile networks"
    - "relaying protocols for wireless energy harvesting and information processing"

Connected through hyperedge HE-5 (induced by source paper "nonorthogonal multiple access for beamforming in energy harvesting enabled networks"):
  with members:
    - "power allocation for energy efficiency and secrecy of interference wireless networks"
    - "achievable rate region of non orthogonal multiple access systems with wireless powered decoder"
    - "non orthogonal multiple access in large scale heterogeneous networks"
    - "joint beamforming and power splitting control in downlink cooperative swipt noma systems"
    - "waveform design for wireless power transfer"
    - "path following algorithms for beamforming and signal splitting in rf energy harvesting networks"
    - "wireless information and power transfer nonlinearity waveform design and rate energy tradeoff"
    - "transceiver design for cooperative non orthogonal multiple access systems with wireless energy transfer"

Connected through hyperedge HE-6 (induced by source paper "noma based energy efficient wireless powered communications"):
  with members:
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "wireless charging technologies fundamentals standards and network applications"
    - "power and channel allocation for non orthogonal multiple access in 5g systems tractability and computation"
    - "a survey of energy efficient techniques for 5g networks and challenges ahead"
    - "energy harvesting wireless communications a review of recent advances"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "full duplex wireless powered communication network with energy causality"

Connected through hyperedge HE-7 (induced by source paper "spectral and energy efficient wireless powered iot networks noma or tdma"):
  with members:
    - "wireless powered cooperative jamming for secure ofdm system"
    - "energy efficient low power circuits for wireless energy and data transfer in iot sensor nodes"
    - "fundamental green tradeoffs progresses challenges and impacts on 5g networks"
    - "an overview of sustainable green 5g networks"
    - "wireless powered communication networks an overview"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-8 (induced by source paper "bi directional cooperative noma without full csit"):
  with members:
    - "noma in distributed antenna system for max min fairness and max sum rate"
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "relay selection for cooperative noma"
    - "cooperative non orthogonal multiple access with simultaneous wireless information and power transfer"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "a general mimo framework for noma downlink and uplink transmission based on signal alignment"
    - "what will 5g be"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.IT(Information Theory)