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: "cutting last wires for mobile communication by microwave power transfer"
  Abstract: The advancements in microwave power transfer (MPT) over past decades have enabled wireless power transfer over long distances. The latest breakthroughs in wireless communication, namely massive MIMO, small cells and millimeter-wave communication, make wireless networks suitable platforms for implementing MPT. This can lead to the elimination of the "last wires" connecting mobile devices to the grid for recharging, thereby tackling a long-standing ICT grand challenge. Furthermore, the seamless integration between MPT and wireless communication opens a new area called wirelessly powered communications (WPC) where many new research directions arise e.g., simultaneous information-and-power transfer, WPC network architectures, and techniques for safe and efficient WPC. This article provides an introduction to WPC by describing the key features of WPC, shedding light on a set of frequently asked questions, and identifying the key design issues and discussing possible solutions.

Connected through hyperedge HE-1 (induced by source paper "wirelessly powered data aggregation for iot via over the air functional computation beamforming and power control"):
  with members:
    - "inference from randomized transmissions by many backscatter sensors"
    - "over the air function computation in sensor networks"
    - "communications and signals design for wireless power transmission"
    - "resource allocation in wireless powered relay networks a bargaining game approach"
    - "wireless powered communication opportunities and challenges"
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "energy harvesting for physical layer security in ofdma networks"
    - "simultaneous wireless information and power transfer under different csi acquisition schemes"

Connected through hyperedge HE-2 (induced by source paper "wireless charging technologies fundamentals standards and network applications"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "wireless powered communication opportunities and challenges"
    - "performance analysis of ambient rf energy harvesting with repulsive point process modeling"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "green wireless power transfer networks"
    - "energy harvesting wireless communications a review of recent advances"
    - "joint wireless information and power transfer for an autonomous multiple antenna relay system"

Connected through hyperedge HE-3 (induced by source paper "throughput analysis and optimization of wireless powered multiple antenna full duplex relay systems"):
  with members:
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "wireless information and power transfer in relay systems with multiple antennas and interference"
    - "full duplex radio for uplink downlink wireless access with spatially random nodes"
    - "harvest then cooperate wireless powered cooperative communications"
    - "multipair full duplex relaying with massive arrays and linear processing"
    - "optimal resource allocation in full duplex wireless powered communication network"
    - "low complexity end to end performance optimization in mimo full duplex relay systems"
    - "full duplex wireless powered relay with self energy recycling"

Connected through hyperedge HE-4 (induced by source paper "wirelessly powered backscatter communication networks modeling coverage and capacity"):
  with members:
    - "modeling and performance analysis of clustered device to device networks"
    - "wireless powered communication opportunities and challenges"
    - "spatial throughput maximization of wireless powered communication networks"
    - "multi antenna wireless energy transfer for backscatter communication systems"
    - "cognitive and energy harvesting based d2d communication in cellular networks stochastic geometry modeling and analysis"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "fundamentals of heterogeneous cellular networks with energy harvesting"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"

Connected through hyperedge HE-5 (induced by source paper "some new research trends in wirelessly powered communications"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "analog spatial decoupling for tackling the near far problem in wirelessly powered communications"
    - "multi antenna wireless energy transfer for backscatter communication systems"
    - "waveform optimization for wireless power transfer with nonlinear energy harvester modeling"
    - "communication using a large scale array of ubiquitous antennas a geometry approach"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-6 (induced by source paper "swipt with practical modulation and rf energy harvesting sensitivity"):
  with members:
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "wireless information and power transfer architecture design and rate energy tradeoff"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-7 (induced by source paper "user attraction via wireless charging in downlink cellular networks"):
  with members:
    - "asymptotic behavior of ultra dense cellular networks and its economic impact"
    - "offloading in heterogeneous networks modeling analysis and design insights"
    - "heterogeneous cellular networks with flexible cell association a comprehensive downlink sinr analysis"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"

Connected through hyperedge HE-8 (induced by source paper "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"):
  with members:
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "full duplex wireless powered relay with self energy recycling"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "joint transmit beamforming and receive power splitting for miso swipt systems"
    - "wireless information and energy transfer in multi antenna interference channel"
    - "energy efficient resource allocation in multiuser ofdm systems with wireless information and power transfer"
    - "throughput maximization in wireless powered communication networks"

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)