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: "information and energy cooperation in ofdm relaying protocols and optimization"
  Abstract: Integrating power transfer into wireless communications for supporting simultaneous wireless information and power transfer (SWIPT) is a promising technique in energy-constrained wireless networks. While most existing work on SWIPT focuses on capacity-energy characterization, the benefits of cooperative transmission for SWIPT are much less investigated. In this paper, we consider SWIPT in an orthogonal frequency-division multiplexing (OFDM) relaying system, where a source node transfers information and a fraction of power simultaneously to a relay node, and the relay node uses the harvested power from the source node to forward the source information to the destination. To support the simultaneous information and energy cooperation, we first propose a transmission protocol assuming that the direct link between the source and destination does not exist, namely power splitting (PS) relaying protocol, where the relay node splits the received signal power in the first hop into two separate parts, one for information decoding and the other for energy harvesting. Then, we consider the case that the direct link between the source and destination is available, and the transmission mode adaptation (TMA) protocol is proposed, where the transmission can be completed by cooperative mode and direct mode simultaneously (over different subcarriers). In direct mode, when the source transmits signal to the destination, the destination receives the signal as information and the relay node concurrently receives the signal for energy harvesting. Joint resource allocation problems are formulated to maximize the system throughput. By using the Lagrangian dual method, we develop efficient algorithms to solve the nonconvex optimization problems.

Connected through hyperedge HE-1 (induced by source paper "energy efficiency of distributed antenna systems with wireless power transfer"):
  with members:
    - "energy efficient swipt in iot distributed antenna systems"
    - "wirelessly powered backscatter communications waveform design and snr energy tradeoff"
    - "fundamental green tradeoffs progresses challenges and impacts on 5g networks"
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "wireless information and power transfer nonlinearity waveform design and rate energy tradeoff"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "optimal resource allocation in full duplex wireless powered communication network"

Connected through hyperedge HE-2 (induced by source paper "throughput maximization in two hop df multiple relay network with simultaneous wireless information and power transfer"):
  with members:
    - "sensitive and nonlinear far field rf energy harvesting in wireless communications"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "training based swipt optimal power splitting at the receiver"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "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"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "wireless information and power transfer with full duplex relaying"

Connected through hyperedge HE-3 (induced by source paper "energy efficient swipt in iot distributed antenna systems"):
  with members:
    - "simultaneous wireless information and power transfer in cooperative relay networks with rateless codes"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "training based swipt optimal power splitting at the receiver"
    - "energy efficient resource assignment and power allocation in heterogeneous cloud radio access networks"
    - "energy harvesting for physical layer security in ofdma networks"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "energy beamforming with one bit feedback"

Connected through hyperedge HE-4 (induced by source paper "joint resource allocation in swipt based multi antenna decode and forward relay networks"):
  with members:
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "relaying strategies for wireless powered mimo relay networks"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "joint wireless information and power transfer for an autonomous multiple antenna relay system"
    - "joint power splitting and antenna selection in energy harvesting relay channels"
    - "energy harvesting for physical layer security in ofdma networks"
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"

Connected through hyperedge HE-5 (induced by source paper "transmission game in mimo interference channels with radio frequency energy harvesting"):
  with members:
    - "collaborative wireless energy and information transfer in interference channel"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "wireless information and energy transfer in multi antenna interference channel"
    - "simultaneous information and power transfer for broadband wireless systems"
    - "wireless information and power transfer in multiuser ofdm systems"
    - "relaying protocols for wireless energy harvesting and information processing"
    - "wireless information transfer with opportunistic energy harvesting"
    - "enabling wireless power transfer in cellular networks architecture modeling and deployment"

Connected through hyperedge HE-6 (induced by source paper "joint uplink downlink resource allocation and data offloading in ofdma based wireless powered hetnets"):
  with members:
    - "an overview of load balancing in hetnets old myths and open problems"
    - "throughput maximization in wireless powered communication networks"
    - "wireless information and power transfer in multiuser ofdm systems"

Connected through hyperedge HE-7 (induced by source paper "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"):
  with members:
    - "optimization of energy constrained wireless powered communication networks with heterogeneous nodes"
    - "robust beamforming for swipt systems with non linear energy harvesting model"
    - "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"
    - "wireless powered communication opportunities and challenges"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "on the efficiency of far field wireless power transfer"
    - "energy efficient resource allocation for wireless powered communication networks"

Connected through hyperedge HE-8 (induced by source paper "wireless information and power transfer for multi relay assisted cooperative communication"):
  with members:
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "energy harvesting for physical layer security in ofdma networks"
    - "wireless information and energy transfer for two hop non regenerative mimo ofdm relay networks"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "wireless information and power transfer with full duplex relaying"
    - "wireless information and power transfer energy efficiency optimization in ofdma systems"

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)