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: "diversity multiplexing tradeoff for the multiple antenna wire tap channel"
  Abstract: In this paper the fading multiple antenna (MIMO) wire-tap channel is investigated under short term power constraints. The secret diversity gain and the secret multiplexing gain are defined. Using these definitions, the secret diversitymultiplexing tradeoff (DMT) is calculated analytically for no transmitter side channel state information (CSI) and for full CSI. When there is no CSI at the transmitter, under the assumption of Gaussian codebooks, it is shown that the eavesdropper steals both transmitter and receiver antennas, and the secret DMT depends on the remaining degrees of freedom. When CSI is available at the transmitter (CSIT), the eavesdropper steals only transmitter antennas. This dependence on the availability of CSI is unlike the DMT results without secrecy constraints, where the DMT remains the same for no CSI and full CSI at the transmitter under short term power constraints. A zero-forcing type scheme is shown to achieve the secret DMT when CSIT is available.

Connected through hyperedge HE-1 (induced by source paper "physical layer security in three tier wireless sensor networks a stochastic geometry approach"):
  with members:
    - "safeguarding massive mimo aided hetnets using physical layer security"
    - "physical layer security in downlink multi antenna cellular networks"
    - "enhancing secrecy with multi antenna transmission in wireless ad hoc networks"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "physical layer security in cellular networks a stochastic geometry approach"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "random deployment of data collectors for serving randomly located sensors"
    - "on the throughput cost of physical layer security in decentralized wireless networks"

Connected through hyperedge HE-2 (induced by source paper "artificial noise aided secure multi antenna transmission with limited feedback"):
  with members:
    - "enhancing secrecy with multi antenna transmission in wireless ad hoc networks"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "jamming games in the mimo wiretap channel with an active eavesdropper"
    - "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"

Connected through hyperedge HE-3 (induced by source paper "on secrecy capacity of fast fading mimome wiretap channels with statistical csit"):
  with members:
    - "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"
    - "on secrecy rate of the generalized artificial noise assisted secure beamforming for wiretap channels"
    - "on secrecy rate analysis of mimo wiretap channels driven by finite alphabet input"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "hessian and concavity of mutual information differential entropy and entropy power in linear vector gaussian channels"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "on the secrecy capacity of fading channels"

Connected through hyperedge HE-4 (induced by source paper "secrecy capacity scaling in large cooperative wireless networks"):
  with members:
    - "constrained colluding eavesdroppers an information theoretic model"
    - "scaling laws for secrecy capacity in cooperative wireless networks"
    - "multi receiver wiretap channel with public and confidential messages"
    - "secure diversity multiplexing tradeoff of zero forcing transmit scheme at finite snr"
    - "an overview of the transmission capacity of wireless networks"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"

Connected through hyperedge HE-5 (induced by source paper "scaling laws for secrecy capacity in cooperative wireless networks"):
  with members:
    - "constrained colluding eavesdroppers an information theoretic model"
    - "multi receiver wiretap channel with public and confidential messages"
    - "secure diversity multiplexing tradeoff of zero forcing transmit scheme at finite snr"
    - "an overview of the transmission capacity of wireless networks"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-6 (induced by source paper "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"):
  with members:
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "on secrecy capacity of fast fading multiple input wiretap channels with statistical csit"):
  with members:
    - "the ergodic capacity of the mimo wire tap channel"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-8 (induced by source paper "secure diversity multiplexing tradeoff of zero forcing transmit scheme at finite snr"):
  with members:
    - "error rates of the maximum likelihood detector for arbitrary constellations convex concave behavior and applications"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "secure communication in the low snr regime a characterization of the energy secrecy tradeoff"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "log concavity property of the error probability with application to local bounds for wireless communications"
    - "impact of spatial correlation on the finite snr diversity multiplexing tradeoff"
    - "the secrecy capacity of the mimo wiretap channel"

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)