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: "on secrecy metrics for physical layer security over quasi static fading channels"
  Abstract: Theoretical studies on physical layer security often adopt the secrecy outage probability as the performance metric for wireless communications over quasi-static fading channels. The secrecy outage probability has two limitations from a practical point of view: 1) it does not give any insight into the eavesdropper’s decodability of confidential messages and 2) it cannot characterize the amount of information leakage to the eavesdropper when an outage occurs. Motivated by the limitations of the secrecy outage probability, we propose three new secrecy metrics for secure transmissions over quasi-static fading channels. The first metric establishes a link between the concept of secrecy outage and the decodability of messages at the eavesdropper. The second metric provides an error-probability-based secrecy metric which is typically used for the practical implementation of secure wireless systems. The third metric characterizes how much or how fast the confidential information is leaked to the eavesdropper. We show that the proposed secrecy metrics collectively give a more comprehensive understanding of physical layer security over fading channels and enable one to appropriately design secure communication systems with different views on how secrecy is measured.

Connected through hyperedge HE-1 (induced by source paper "on secure transmission design an information leakage perspective"):
  with members:
    - "secrecy outage for wireless sensor networks"
    - "securing on body iot devices by exploiting creeping wave propagation"
    - "resonance based secure pairing for wearables"
    - "secure on off transmission design with channel estimation errors"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"

Connected through hyperedge HE-2 (induced by source paper "secrecy outage performance of multi antenna wiretap channels with diversity combinings over correlated rayleigh fading channels"):
  with members:
    - "secrecy outage analysis over correlated composite nakagami m gamma fading channels"

Connected through hyperedge HE-3 (induced by source paper "secure communications for the two user broadcast channel with random traffic"):
  with members:
    - "wiretap channels nonasymptotic fundamental limits"
    - "exploiting full duplex receivers for achieving secret communications in multiuser miso networks"
    - "probabilistic cooperation of a full duplex relay in random access networks"
    - "finite blocklength bounds for wiretap channels"
    - "stable throughput region of the two user broadcast channel"
    - "the stability region of the two user broadcast channel"
    - "throughput analysis for full duplex wireless networks with imperfect self interference cancellation"
    - "fundamental limits of caching with secure delivery"

Connected through hyperedge HE-4 (induced by source paper "artificial noise injection for securing single antenna systems"):
  with members:
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "achieving secrecy without knowing the number of eavesdropper antennas"
    - "secure on off transmission design with channel estimation errors"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "power allocation and time domain artificial noise design for wiretap ofdm with discrete inputs"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"

Connected through hyperedge HE-5 (induced by source paper "on the design of secure non orthogonal multiple access systems"):
  with members:
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "a survey of downlink non orthogonal multiple access for 5g wireless communication networks"
    - "achieving secrecy without knowing the number of eavesdropper antennas"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "a general mimo framework for noma downlink and uplink transmission based on signal alignment"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"
    - "secure on off transmission design with channel estimation errors"
    - "large system analysis of linear precoding in miso broadcast channels with confidential messages"

Connected through hyperedge HE-6 (induced by source paper "artificial noise aided secure transmission with directional modulation based on random frequency diverse arrays"):
  with members:
    - "the random frequency diverse array a new antenna structure for uncoupled direction range indication in active sensing"
    - "location based beamforming for enhancing secrecy in rician wiretap channels"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "optimization of code rates in sisome wiretap channels"
    - "wireless physical layer security with imperfect channel state information a survey"

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)