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: "robust beamforming for wireless information and power transmission"
  Abstract: In this letter, we study the robust beamforming problem for the multi-antenna wireless broadcasting system with simultaneous information and power transmission, under the assumption of imperfect channel state information (CSI) at the transmitter. Following the worst-case deterministic model, our objective is to maximize the worst-case harvested energy for the energy receiver while guaranteeing that the rate for the information receiver is above a threshold for all possible channel realizations. Such problem is nonconvex with infinite number of constraints. Using certain transformation techniques, we convert this problem into a relaxed semidefinite programming problem (SDP) which can be solved efficiently. We further show that the solution of the relaxed SDP problem is always rank-one. This indicates that the relaxation is tight and we can get the optimal solution for the original problem. Simulation results are presented to validate the effectiveness of the proposed algorithm.

Connected through hyperedge HE-1 (induced by source paper "simultaneous wireless information and power transfer for decode and forward multihop relay systems in energy constrained iot networks"):
  with members:
    - "end to end throughput maximization for underlay multi hop cognitive radio networks with rf energy harvesting"
    - "retrodirective multi user wireless power transfer with massive mimo"
    - "simultaneous information and energy flow for iot relay systems with crowd harvesting"
    - "wireless powered communication opportunities and challenges"
    - "resource allocation techniques for wireless powered communication networks with energy storage constraint"
    - "energy harvesting wireless communications a review of recent advances"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "application of smart antenna technologies in simultaneous wireless information and power transfer"

Connected through hyperedge HE-2 (induced by source paper "energy sustainable paradigms and methods for future mobile networks a survey"):
  with members:
    - "information exchange in randomly deployed dense wsns with wireless energy harvesting capabilities"
    - "a stochastic geometry based demand response management framework for cellular networks powered by smart grid"
    - "fog computing based radio access networks issues and challenges"
    - "a hybrid energy sharing framework for green cellular networks"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "green networking in cellular hetnets a unified radio resource management framework with base station on off switching"
    - "online ski rental for on off scheduling of energy harvesting base stations"
    - "dynamic clustering and on off strategies for wireless small cell networks"

Connected through hyperedge HE-3 (induced by source paper "on the secrecy performance of swipt receiver architectures with multiple eavesdroppers"):
  with members:
    - "secrecy outage for wireless sensor networks"
    - "secrecy outage of swipt in the presence of cooperating eavesdroppers"
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "physical layer security jamming theoretical limits and practical designs in wireless networks"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "opportunistic wireless energy harvesting in cognitive radio networks"

Connected through hyperedge HE-4 (induced by source paper "energy sustainable iot with individual qos constraints through miso swipt multicasting"):
  with members:
    - "jointly optimal spatial channel assignment and power allocation for mimo swipt systems"
    - "random access analysis for massive iot networks under a new spatio temporal model a stochastic geometry approach"
    - "robust an aided beamforming and power splitting design for secure miso cognitive radio with swipt"
    - "power allocation and scheduling for swipt systems with non linear energy harvesting model"
    - "joint beamforming design for multi user wireless information and power transfer"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "joint transmit beamforming and receive power splitting for miso swipt systems"
    - "beamforming for miso interference channels with qos and rf energy transfer"

Connected through hyperedge HE-5 (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"
    - "wireless powered communications performance analysis and optimization"
    - "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"

Connected through hyperedge HE-6 (induced by source paper "decentralized robust transceiver designs for miso swipt interference channel"):
  with members:
    - "reel bf design achieving the sdp bound for downlink beamforming with arbitrary shaping constraints"
    - "joint optimization of power and data transfer in multiuser mimo systems"
    - "robust transceiver design for miso interference channel with energy harvesting"
    - "communications and signals design for wireless power transmission"
    - "joint transceiver design algorithms for multiuser miso relay systems with energy harvesting"
    - "energy harvesting wireless communications a review of recent advances"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-7 (induced by source paper "probabilistically robust swipt for secrecy misome systems"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "energy harvesting for physical layer security in ofdma networks"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "wireless information transfer with opportunistic energy harvesting"

Connected through hyperedge HE-8 (induced by source paper "joint optimization of power splitting and allocation for swipt in interference alignment networks"):
  with members:
    - "interactive joint transfer of energy and information"
    - "simultaneous information and power transfer for broadband wireless systems"
    - "wireless information and power transfer a dynamic power splitting approach"
    - "guiding blind transmitters degrees of freedom optimal interference alignment using relays"
    - "adaptive interference alignment with csi uncertainty"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"
    - "transmission with energy harvesting nodes in fading wireless channels optimal policies"
    - "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)