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: "outage constrained secrecy rate maximization using cooperative jamming"
  Abstract: We consider a Gaussian MISO wiretap channel, where a multi-antenna source communicates with a single-antenna destination in the presence of a single-antenna eavesdropper. The communication is assisted by multi-antenna helpers that act as jammers to the eavesdropper. Each helper independently transmits noise which lies in the null space of the channel to the destination, thus creates no interference to the destination. Under the assumption that there is eavesdropper channel uncertainty, we derive the optimal covariance matrix for the source signal so that the secrecy rate is maximized subject to probability of outage and power constraints. Assuming that the eavesdropper channels follow zero-mean Gaussian model with known covariances, we derive the outage probability in a closed form. Simulation results in support of the analysis are provided.

Connected through hyperedge HE-1 (induced by source paper "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"):
  with members:
    - "on secrecy performance of antenna selection aided mimo systems against eavesdropping"
    - "secrecy outage probability analysis of multi user multi eavesdropper wireless systems"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "a comparative study of relaying schemes with decode and forward over nakagami m fading channels"
    - "on cooperative relaying schemes for wireless physical layer security"

Connected through hyperedge HE-2 (induced by source paper "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"):
  with members:
    - "robust secure transmission in miso channels based on worst case optimization"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "optimal and robust transmit designs for miso channel secrecy by semidefinite programming"
    - "solutions for the mimo gaussian wiretap channel with a cooperative jammer"
    - "outage constrained robust transmit optimization for multiuser miso downlinks tractable approximations by conic optimization"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "collaborative relay beamforming for secrecy"

Connected through hyperedge HE-3 (induced by source paper "improving physical layer secrecy using full duplex jamming receivers"):
  with members:
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "cooperative jamming for secure communications in mimo relay networks"
    - "the secrecy capacity region of the gaussian mimo multi receiver 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)