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: "energy efficient resource allocation in multiuser ofdm systems with wireless information and power transfer"
  Abstract: In this paper, we study the resource allocation algorithm design for multiuser orthogonal frequency division multiplexing (OFDM) downlink systems with simultaneous wireless information and power transfer. The algorithm design is formulated as a non-convex optimization problem for maximizing the energy efficiency of data transmission (bit/Joule delivered to the users). In particular, the problem formulation takes into account the minimum required system data rate, heterogeneous minimum required power transfers to the users, and the circuit power consumption. Subsequently, by exploiting the method of timesharing and the properties of nonlinear fractional programming, the considered non-convex optimization problem is solved using an efficient iterative resource allocation algorithm. For each iteration, the optimal power allocation and user selection solution are derived based on Lagrange dual decomposition. Simulation results illustrate that the proposed iterative resource allocation algorithm achieves the maximum energy efficiency of the system and reveal how energy efficiency, system capacity, and wireless power transfer benefit from the presence of multiple users in the system.

Connected through hyperedge HE-1 (induced by source paper "artificial noise aided secrecy information and power transfer in ofdma systems"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "energy harvesting for physical layer security in ofdma networks"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "resource allocation for secure communication in systems with wireless information and power transfer"
    - "power allocation and time domain artificial noise design for wiretap ofdm with discrete inputs"
    - "spectral efficient optimization in ofdm systems with wireless information and power transfer"
    - "wireless information and power transfer in multiuser ofdm systems"

Connected through hyperedge HE-2 (induced by source paper "relay control for full duplex relaying with wireless information and energy transfer"):
  with members:
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "full duplex mimo relaying powered by wireless energy transfer"
    - "on the efficiency of far field wireless power transfer"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"
    - "outage analysis and optimization for time switching based two way relaying with energy harvesting relay node"
    - "wireless information and energy transfer for decode and forward relying mimo ofdm networks"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-3 (induced by source paper "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"):
  with members:
    - "cutting last wires for mobile communication by microwave power transfer"
    - "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"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-4 (induced by source paper "energy harvesting networks with energy cooperation procrastinating policies"):
  with members:
    - "energy harvesting wireless communications a review of recent advances"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "power allocation for conventional and buffer aided link adaptive relaying systems with energy harvesting nodes"
    - "energy efficient optimization for wireless information and power transfer in large scale mimo systems employing energy beamforming"
    - "energy cooperation in energy harvesting communications"
    - "interactive joint transfer of energy and information"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "relay selection for simultaneous information transmission and wireless energy transfer a tradeoff perspective"

Connected through hyperedge HE-5 (induced by source paper "power splitting for full duplex relay with wireless information and power transfer"):
  with members:
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "dynamic power splitting policies for af relay networks with wireless energy harvesting"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "wireless information and power transfer with full duplex 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 "optimal multiuser scheduling schemes for simultaneous wireless information and power transfer"):
  with members:
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "power efficient and secure multiuser communication systems with wireless information and power transfer"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "application of smart antenna technologies in simultaneous wireless information and power transfer"
    - "throughput maximization in wireless powered communication networks"

Connected through hyperedge HE-7 (induced by source paper "simultaneous wireless information and power transfer under different csi acquisition schemes"):
  with members:
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "dynamic resource allocation for multiple antenna wireless power transfer"
    - "spectral efficient optimization in ofdm systems with wireless information and power transfer"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "wireless information and power transfer energy efficiency optimization in ofdma systems"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "robust beamforming for wireless information and power transmission"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-8 (induced by source paper "secrecy wireless information and power transfer in ofdma systems"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "energy harvesting for physical layer security in ofdma networks"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "resource allocation for secure communication in systems with wireless information and power transfer"
    - "power allocation and time domain artificial noise design for wiretap ofdm with discrete inputs"
    - "wireless information and power transfer in multiuser ofdm systems"
    - "power and subcarrier allocation for physical layer security in ofdma based broadband wireless networks"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

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)