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: "mimo gaussian broadcast channels with confidential and common messages"
  Abstract: This paper considers the problem of secret communication over a two-receiver multiple-input multiple-output (MIMO) Gaussian broadcast channel. The transmitter has two independent, confidential messages and a common message. Each of the confidential messages is intended for one of the receivers but needs to be kept perfectly secret from the other, and the common message is intended for both receivers. It is shown that a natural scheme that combines secret dirty-paper coding with Gaussian superposition coding achieves the secrecy capacity region. To prove this result, a channel-enhancement approach and an extremal entropy inequality of Weingarten et al. are used.

Connected through hyperedge HE-1 (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-2 (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"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"

Connected through hyperedge HE-3 (induced by source paper "robust artificial noise aided transmit design for multi user miso systems with integrated services"):
  with members:
    - "safeguarding decentralized wireless networks using full duplex jamming receivers"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "physical layer multicasting by stochastic transmit beamforming and alamouti space time coding"
    - "wireless physical layer security with imperfect channel state information a survey"
    - "outage constrained robust secure transmission for miso wiretap channels"
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "precoder design for physical layer multicasting"
    - "robust secure transmission in miso channels based on worst case optimization"

Connected through hyperedge HE-4 (induced by source paper "new results on multiple input multiple output broadcast channels with confidential messages"):
  with members:
    - "capacity equivocation region of the gaussian mimo wiretap channel"
    - "capacity region of gaussian mimo broadcast channels with common and confidential messages"
    - "multiple input multiple output gaussian broadcast channels with common and confidential messages"
    - "capacity bounds for broadcast channels with confidential messages"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-5 (induced by source paper "mimo wiretap channels with arbitrarily varying eavesdropper channel states"):
  with members:
    - "capacity equivocation region of the gaussian mimo wiretap channel"
    - "strong secrecy and reliable byzantine detection in the presence of an untrusted relay"
    - "cooperation with an untrusted relay a secrecy perspective"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"
    - "on the compound mimo broadcast channels with confidential messages"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "secrecy in cooperative relay broadcast channels"

Connected through hyperedge HE-6 (induced by source paper "capacity region of gaussian mimo broadcast channels with common and confidential messages"):
  with members:
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "multiple input multiple output gaussian broadcast channels with common and confidential messages"
    - "gaussian mimo broadcast channels with common and confidential messages"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "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"
    - "capacity bounds for broadcast channels with confidential messages"
    - "multiple input multiple output gaussian broadcast channels with confidential messages"

Connected through hyperedge HE-7 (induced by source paper "gaussian mimo broadcast channels with common and confidential messages"):
  with members:
    - "capacity region of gaussian mimo broadcast channels with common 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"

Connected through hyperedge HE-8 (induced by source paper "multiple input multiple output gaussian broadcast channels with common and confidential messages"):
  with members:
    - "gaussian mimo broadcast channels with common and confidential messages"
    - "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)