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: "performance analysis of ambient rf energy harvesting a stochastic geometry approach"
  Abstract: Ambient RF (Radio Frequency) energy harvesting techniques have recently been proposed as a potential solution to provide proactive energy replenishment for wireless devices. This paper aims to analyze the performance of a battery-free wireless sensor powered by ambient RF energy harvesting using a stochastic-geometry approach. Specifically, we consider a random network model in which ambient RF sources are distributed as a Ginibre α-determinantal point process which recovers the Poisson point process when α approaches zero. We characterize the expected RF energy harvesting rate. We also perform a worst-case study which derives the upper bounds of both power outage and transmission outage probabilities. Numerical results show that our upper bounds are accurate and that better performance is achieved when the distribution of ambient sources exhibits stronger repulsion.

Connected through hyperedge HE-1 (induced by source paper "wireless powered device to device communications with ambient backscattering performance modeling and analysis"):
  with members:
    - "analysis of wireless powered device to device communications with ambient backscattering"
    - "wireless charging technologies fundamentals standards and network applications"
    - "wirelessly powered backscatter communication networks modeling coverage and capacity"
    - "downlink coverage probability in a cellular network with ginibre deployed base stations and nakagami m fading channels"
    - "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"
    - "hierarchical cooperation for operator controlled device to device communications a layered coalitional game approach"

Connected through hyperedge HE-2 (induced by source paper "analysis of wireless powered device to device communications with ambient backscattering"):
  with members:
    - "wireless charging technologies fundamentals standards and network applications"
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "hierarchical cooperation for operator controlled device to device communications a layered coalitional game approach"
    - "wireless charger networking for mobile devices fundamentals standards and applications"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "dynamic spectrum access in cognitive radio networks with rf energy harvesting"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-3 (induced by source paper "ambient backscatter networking a novel paradigm to assist wireless powered communications"):
  with members:
    - "analysis of wireless powered device to device communications with ambient backscattering"
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "dynamic spectrum access in cognitive radio networks with rf energy harvesting"
    - "full duplex wireless powered relay with self energy recycling"

Connected through hyperedge HE-4 (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-5 (induced by source paper "simultaneous information and energy flow for iot relay systems with crowd harvesting"):
  with members:
    - "a high reliability asymptotic approach for packet inter delivery time optimization in cyber physical systems"
    - "outage minimization for a fading wireless link with energy harvesting transmitter and receiver"
    - "downlink cellular network analysis with multi slope path loss models"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "relaying protocols for wireless energy harvesting and information processing"

Connected through hyperedge HE-6 (induced by source paper "performance analysis of ambient rf energy harvesting with repulsive point process modeling"):
  with members:
    - "performance analysis of simultaneous wireless information and power transfer with ambient rf energy harvesting"
    - "resource allocation in wireless networks with rf energy harvesting and transfer"
    - "wireless charger networking for mobile devices fundamentals standards and applications"
    - "the ginibre point process as a model for wireless networks with repulsion"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "dynamic spectrum access in cognitive radio networks with rf energy harvesting"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "a layered coalitional game framework of wireless relay network"

Connected through hyperedge HE-7 (induced by source paper "performance analysis of simultaneous wireless information and power transfer with ambient rf energy harvesting"):
  with members:
    - "dynamic spectrum access in cognitive radio networks with rf energy harvesting"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "wireless information and power transfer architecture design and rate energy tradeoff"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"
    - "mimo broadcasting for simultaneous wireless information and power transfer"
    - "a tractable approach to coverage and rate in cellular networks"

Connected through hyperedge HE-8 (induced by source paper "millimeter wave power transfer and information transmission"):
  with members:
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "spatially sparse precoding in millimeter wave mimo systems"
    - "millimeter wave channel modeling and cellular capacity evaluation"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "millimeter wave beamforming for wireless backhaul and access in small cell networks"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"

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)