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: "capacity region of gaussian mimo broadcast channels with common and confidential messages"
  Abstract: We study the two-user Gaussian multiple-input multiple-output (MIMO) broadcast channel with common and confidential messages. In this channel, the transmitter sends a common message to both users, and a confidential message to each user which needs to be kept perfectly secret from the other user. We obtain the entire capacity region of this channel. We also explore the connections between the capacity region we obtain for the Gaussian MIMO broadcast channel with common and confidential messages and the capacity region of its non-confidential counterpart, i.e., the Gaussian MIMO broadcast channel with common and private messages, which is not known completely.

Connected through hyperedge HE-1 (induced by source paper "vector gaussian successive refinement with degraded side information"):
  with members:
    - "the sum rate of vector gaussian multiple description coding with tree structured covariance distortion constraints"
    - "vector gaussian rate distortion with variable side information"
    - "broadcasting correlated vector gaussians"
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "private broadcasting over independent parallel channels"
    - "information theoretic proofs of entropy power inequalities"
    - "secure lossy transmission of vector gaussian sources"
    - "capacity equivocation region of the gaussian mimo wiretap channel"

Connected through hyperedge HE-2 (induced by source paper "secure broadcasting using independent secret keys"):
  with members:
    - "secrecy results for compound wiretap channels"
    - "strong secrecy for multiple access channels"
    - "effective secrecy reliability confusion and stealth"
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "capacity results for compound wiretap channels"
    - "strong secrecy from channel resolvability"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "secret communication with feedback"

Connected through hyperedge HE-3 (induced by source paper "physical layer service integration in 5g potentials and challenges"):
  with members:
    - "fundamental green tradeoffs progresses challenges and impacts on 5g networks"
    - "an overview of sustainable green 5g networks"
    - "gsvd based precoding in mimo systems with integrated services"
    - "robust artificial noise aided transmit design for multi user miso systems with integrated services"
    - "wireless powered communication opportunities and challenges"
    - "multi antenna relay aided wireless physical layer security"
    - "enhancing wireless information and power transfer by exploiting multi antenna techniques"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-4 (induced by source paper "broadcast channels with privacy leakage constraints"):
  with members:
    - "fourier motzkin elimination software for information theoretic inequalities"
    - "the likelihood encoder for lossy compression"
    - "wiretap channels with random states non causally available at the encoder"
    - "strong secrecy for cooperative broadcast channels"
    - "semantic security capacity for wiretap channels of type ii"
    - "secrecy capacity region of some classes of wiretap broadcast channels"
    - "a technique for deriving one shot achievability results in network information theory"
    - "effective secrecy reliability confusion and stealth"

Connected through hyperedge HE-5 (induced by source paper "artificial noise aided biobjective transmitter optimization for service integration in multi user mimo broadcast channel"):
  with members:
    - "gsvd based precoding in mimo systems with integrated services"
    - "robust artificial noise aided transmit design for multi user miso systems with integrated services"
    - "what will 5g be"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "physical layer multicasting by stochastic transmit beamforming and alamouti space time coding"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "wireless physical layer security with imperfect channel state information a survey"
    - "new results on multiple input multiple output broadcast channels with confidential messages"

Connected through hyperedge HE-6 (induced by source paper "exploiting full duplex receivers for achieving secret communications in multiuser miso networks"):
  with members:
    - "individual secrecy for broadcast channels with receiver side information"
    - "individual secrecy for the broadcast channel"
    - "multi objective optimization for robust power efficient and secure full duplex wireless communication systems"
    - "joint design of optimal cooperative jamming and power allocation for linear precoding"
    - "on the degrees of freedom of the mimo wiretap and mimo broadcast channels with unknown eavesdroppers"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "experiment driven characterization of full duplex wireless systems"
    - "mimo gaussian broadcast channels with confidential and common messages"

Connected through hyperedge HE-7 (induced by source paper "a new wiretap channel model and its strong secrecy capacity"):
  with members:
    - "semantic security capacity for wiretap channels of type ii"
    - "distributed channel synthesis"
    - "achievability proof via output statistics of random binning"
    - "the gaussian many to one interference channel with confidential messages"
    - "the role of feedback in two way secure communications"
    - "secure nested codes for type ii wiretap channels"
    - "the gaussian multiple access wire tap channel"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-8 (induced by source paper "mimo gaussian broadcast channels with common private and confidential messages"):
  with members:
    - "broadcast channels with privacy leakage constraints"
    - "the capacity region of the two receiver vector gaussian broadcast channel with private and common messages"
    - "multi receiver wiretap channel with public and confidential messages"
    - "multiple input multiple output gaussian broadcast channels with common and confidential messages"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "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)