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: "secure communication with a wireless powered friendly jammer"
  Abstract: In this paper, we propose to use a wireless-powered friendly jammer to enable secure communication between a source node and destination node, in the presence of an eavesdropper. We consider a two-phase communication protocol with fixed-rate transmission. In the first phase, wireless power transfer is conducted from the source to the jammer. In the second phase, the source transmits the information-bearing signal under the protection of a jamming signal sent by the jammer using the harvested energy in the first phase. We analytically characterize the long-time behavior of the proposed protocol and derive a closed-form expression for the throughput. We further optimize the rate parameters for maximizing the throughput subject to a secrecy outage probability constraint. Our analytical results show that the throughput performance differs significantly between the single-antenna jammer case and the multi-antenna jammer case. For instance, as the source transmit power increases, the throughput quickly reaches an upper bound with single-antenna jammer, while the throughput grows unbounded with multi-antenna jammer. Our numerical results also validate the derived analytical results.

Connected through hyperedge HE-1 (induced by source paper "secure transmission and self energy recycling with partial eavesdropper csi"):
  with members:
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "proactive eavesdropping in relaying systems"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "secure communications in the presence of a buffer aided wireless powered relay with self energy recycling"
    - "robust an aided beamforming and power splitting design for secure miso cognitive radio with swipt"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "secure massive mimo transmission with an active eavesdropper"
    - "secure communication via a wireless energy harvesting untrusted relay"

Connected through hyperedge HE-2 (induced by source paper "energy harvesting fairness in an aided secure mu mimo swipt systems with cooperative jammer"):
  with members:
    - "beamforming and power splitting designs for an aided secure multi user mimo swipt systems"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "secure beamforming for mimo broadcasting with wireless information and power transfer"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "mimo broadcasting for simultaneous wireless information and power transfer"

Connected through hyperedge HE-3 (induced by source paper "wireless powered cooperative jamming for secure ofdm system"):
  with members:
    - "waveform optimization for radio frequency wireless power transfer"
    - "waveform design for wireless power transfer"
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "a general design framework for mimo wireless energy transfer with limited feedback"
    - "wireless power transfer in massive mimo aided hetnets with user association"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "communications and signals design for wireless power transmission"
    - "to harvest and jam a paradigm of self sustaining friendly jammers for secure af relaying"

Connected through hyperedge HE-4 (induced by source paper "power efficient and secure wpcns with hardware impairments and non linear eh circuit"):
  with members:
    - "spectral efficiency of multipair massive mimo two way relaying with hardware impairments"
    - "fundamental green tradeoffs progresses challenges and impacts on 5g networks"
    - "max min fair beamforming for swipt systems with non linear eh model"
    - "power allocation for secure swipt systems with wireless powered cooperative jamming"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "analysis and design of secure massive mimo systems in the presence of hardware impairments"
    - "on the spectral efficiency of massive mimo systems with low resolution adcs"
    - "wireless powered communication networks an overview"

Connected through hyperedge HE-5 (induced by source paper "exploiting interference for secrecy wireless information and power transfer"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "to harvest and jam a paradigm of self sustaining friendly jammers for secure af relaying"
    - "wireless powered communication opportunities and challenges"
    - "wireless powered cooperative jamming for secrecy multi af relaying networks"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"

Connected through hyperedge HE-6 (induced by source paper "energy harvesting based secure two way communication using an untrusted relay"):
  with members:
    - "joint relay selection and power allocation in large scale mimo systems with untrusted relays and passive eavesdroppers"
    - "optimal power allocation and secrecy sum rate in two way untrusted relaying"
    - "joint relay and jammer selection improves the physical layer security in the face of csi feedback delays"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "secure communication via a wireless energy harvesting untrusted relay"
    - "security versus reliability analysis of opportunistic relaying"
    - "secure beamforming for mimo two way communications with an untrusted relay"

Connected through hyperedge HE-7 (induced by source paper "physical layer security jamming theoretical limits and practical designs in wireless networks"):
  with members:
    - "to harvest and jam a paradigm of self sustaining friendly jammers for secure af relaying"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "interference assisted secret communication"

Connected through hyperedge HE-8 (induced by source paper "secure two way communication via a wireless powered untrusted relay and friendly jammer"):
  with members:
    - "optimal power allocation and secrecy sum rate in two way untrusted relaying"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "secure communication via a wireless energy harvesting untrusted relay"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "a new look at dual hop relaying performance limits with hardware impairments"

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)