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 performance analysis and optimization"
  Abstract: This paper investigates the average throughput of a wireless-powered communications system, where an energy constrained source, powered by a dedicated power beacon (PB), communicates with a destination. It is assumed that the PB is capable of performing channel estimation, digital beamforming, and spectrum sensing as a communication device. Considering a time-splitting approach, the source first harvests energy from the PB equipped with multiple antennas, and then transmits information to the destination. Assuming Nakagami-  $m$   fading channels, analytical expressions for the average throughput are derived for two different transmission modes, namely,  delay tolerant  and  delay intolerant . In addition, closed-form solutions for the optimal time split, which maximize the average throughput are obtained in some special cases, i.e., high-transmit power regime and large number of antennas. Finally, the impact of cochannel interference is studied. Numerical and simulation results have shown that increasing the number of transmit antennas at the PB is an effective tool to improve the average throughput and the interference can be potentially exploited to enhance the average throughput, since it can be utilized as an extra source of energy. Also, the impact of fading severity level of the energy transfer link on the average throughput is not significant, especially if the number of PB antennas is large. Finally, it is observed that the source position has a great impact on the average throughput.

Connected through hyperedge HE-1 (induced by source paper "wirelessly powered sensor networks power allocation for channel estimation and energy beamforming"):
  with members:
    - "cluster based wireless energy transfer for low complex energy receivers"
    - "wireless energy beamforming using received signal strength indicator feedback"
    - "on the beneficial roles of fading and transmit diversity in wireless power transfer with nonlinear energy harvesting"
    - "waveform design for wireless power transfer with limited feedback"
    - "distributed wireless power transfer with energy feedback"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "on the feasibility of wireless energy transfer using massive antenna arrays"
    - "waveform design for wireless power transfer"

Connected through hyperedge HE-2 (induced by source paper "transmission delay minimization in wireless powered communication systems"):
  with members:
    - "power allocation and effective capacity of af successive relays"
    - "optimization and analysis of wireless powered multi antenna cooperative systems"
    - "cross layer optimization for ultra reliable and low latency radio access networks"
    - "wireless powered dual hop multi antenna relaying systems impact of csi and antenna correlation"
    - "effective capacity of receive antenna selection mimo ostbc systems in co channel interference"
    - "wireless charging technologies fundamentals standards and network applications"
    - "wireless powered communication networks an overview"
    - "some new research trends in wirelessly powered communications"

Connected through hyperedge HE-3 (induced by source paper "joint uplink and downlink coverage analysis of cellular based rf powered iot network"):
  with members:
    - "modeling and analysis of cellular networks using stochastic geometry a tutorial"
    - "a primer on cellular network analysis using stochastic geometry"
    - "enriched k tier hetnet model to enable the analysis of user centric small cell deployments"
    - "user point processes in cellular networks"
    - "millimeter wave energy harvesting"
    - "optimal policies for wireless networks with energy harvesting transmitters and receivers effects of decoding costs"
    - "performance analysis of ambient rf energy harvesting with repulsive point process modeling"
    - "energy harvesting wireless communications a review of recent advances"

Connected through hyperedge HE-4 (induced by source paper "wireless powered dual hop multi antenna relaying systems impact of csi and antenna correlation"):
  with members:
    - "on the performance of multi antenna wireless powered communications with energy beamforming"
    - "an overview of sustainable green 5g networks"
    - "training based swipt optimal power splitting at the receiver"
    - "joint wireless information and power transfer for an autonomous multiple antenna relay system"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"
    - "harvest then cooperate wireless powered cooperative communications"
    - "wireless networks with rf energy harvesting a contemporary survey"

Connected through hyperedge HE-5 (induced by source paper "optimization and analysis of wireless powered multi antenna cooperative systems"):
  with members:
    - "on the performance of multi antenna wireless powered communications with energy beamforming"
    - "relaying strategies for wireless powered mimo relay networks"
    - "wireless powered communication opportunities and challenges"
    - "on the efficiency of far field wireless power transfer"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "optimum wirelessly powered relaying"
    - "spatial throughput maximization of wireless powered communication networks"
    - "harvest then cooperate wireless powered cooperative communications"

Connected through hyperedge HE-6 (induced by source paper "power beacon assisted millimeter wave ad hoc networks"):
  with members:
    - "modeling and analyzing millimeter wave cellular systems"
    - "adaptively directional wireless power transfer for large scale sensor networks"
    - "performance analysis of outdoor mmwave ad hoc networks"
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "the intensity matching approach a tractable stochastic geometry approximation to system level analysis of cellular networks"
    - "communications and signals design for wireless power transmission"
    - "ambient rf energy harvesting in ultra dense small cell networks performance and trade offs"
    - "millimeter wave energy harvesting"

Connected through hyperedge HE-7 (induced by source paper "interference aided energy harvesting cognitive relaying with multiple primary transceivers"):
  with members:
    - "rf based energy harvesting in decode and forward relaying systems ergodic and outage capacities"
    - "wireless energy harvesting in a cognitive relay network"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "optimal time sharing in underlay cognitive radio systems with rf energy harvesting"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "interference assisted wireless energy harvesting in cognitive relay network with multiple primary transceivers"
    - "outage analysis of spectrum sharing energy harvesting cognitive relays in nakagami m channels"
    - "harvest then cooperate wireless powered cooperative communications"

Connected through hyperedge HE-8 (induced by source paper "end to end throughput maximization for underlay multi hop cognitive radio networks with rf energy harvesting"):
  with members:
    - "wireless networks with energy harvesting and power transfer joint power and time allocation"
    - "resource allocation and fairness in wireless powered cooperative cognitive radio networks"
    - "optimal time sharing in underlay cognitive radio systems with rf energy harvesting"
    - "cognitive wireless powered network spectrum sharing models and throughput maximization"
    - "harvest then cooperate wireless powered cooperative communications"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "full duplex wireless powered communication network with energy causality"

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)