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 x channels with feedback and delayed csi"
  Abstract: The sum degrees of freedom (DoF) of the two-user MIMO X-channel is characterized in the presence of output feedback and delayed channel state information (CSI). The number of antennas at each transmitters is assumed to be M and the number of antennas at each of the receivers is assumed to be N. It is shown that the sum DoF of the two-user MIMO X-channel is the same as the sum DoF of a two-user MIMO broadcast channel with 2M transmit antennas, and N antennas at each receiver. Hence, for this symmetric antenna configuration, there is no performance loss in the sum degrees of freedom due to the distributed nature of the transmitters. This result highlights the usefulness of feedback and delayed CSI for the MIMO X-channel. The K-user X-channel with a single antenna at each transmitter and each receiver is also studied. In this network, each transmitter has a message intended for each receiver. For this network, it is shown that the sum DoF with partial output feedback alone is at least 2K/(K + 1). This lower bound is strictly better than the best lower bound known for the case of delayed CSI assumption for all values of K.

Connected through hyperedge HE-1 (induced by source paper "on the degrees of freedom of mimo x networks with non cooperation transmitters"):
  with members:
    - "distributed space time interference alignment with moderately delayed csit"
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "linear degrees of freedom of the mimo x channel with delayed csit"
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "degrees of freedom region of the mimo x channel with an arbitrary number of antennas"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "the degrees of freedom region of the mimo interference channel with shannon feedback"

Connected through hyperedge HE-2 (induced by source paper "on the degrees of freedom of siso x networks with synergistic alternating channel state information at transmitters"):
  with members:
    - "completely stale transmitter channel state information is still very useful"

Connected through hyperedge HE-3 (induced by source paper "secure degrees of freedom region of the two user miso broadcast channel with alternating csit"):
  with members:
    - "secure degrees of freedom of wireless x networks using artificial noise alignment"
    - "aligned image sets under channel uncertainty settling a conjecture by lapidoth shamai and wigger on the collapse of degrees of freedom under finite precision csit"
    - "on the degrees of freedom of the 3 user miso broadcast channel with hybrid csit"
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "dof analysis of the k user miso broadcast channel with alternating csit"
    - "on the dof region of the k user miso broadcast channel with hybrid csit"
    - "linear degrees of freedom of the mimo x channel with delayed csit"
    - "secure degrees of freedom of mimo x channels with output feedback and delayed csit"

Connected through hyperedge HE-4 (induced by source paper "secure degrees of freedom of wireless x networks using artificial noise alignment"):
  with members:
    - "secure degrees of freedom of one hop wireless networks"
    - "multiaccess channel with partially cooperating encoders and security constraints"
    - "secure degrees of freedom of k user gaussian interference channels a unified view"
    - "secure degrees of freedom of mimo x channels with output feedback and delayed csit"
    - "secure communication over parallel relay channel"
    - "on achievable degrees of freedom for mimo x channels"
    - "interference alignment for secrecy"
    - "interference assisted secret communication"

Connected through hyperedge HE-5 (induced by source paper "distributed space time interference alignment with moderately delayed csit"):
  with members:
    - "space time physical layer network coding"
    - "ergodic interference alignment with delayed feedback"
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "optimal use of current and outdated channel state information degrees of freedom of the miso bc with mixed csit"
    - "on the degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "interference alignment with incomplete csit sharing"

Connected through hyperedge HE-6 (induced by source paper "interference and x networks with noisy cooperation and feedback"):
  with members:
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "the degrees of freedom region of the mimo interference channel with shannon feedback"
    - "interference alignment for the mimo interference channel with delayed local csit"
    - "the degrees of freedom region and interference alignment for the mimo interference channel with delayed csi"
    - "dependence balance based outer bounds for gaussian networks with cooperation and feedback"
    - "interference channels with destination cooperation"
    - "completely stale transmitter channel state information is still very useful"

Connected through hyperedge HE-7 (induced by source paper "secure degrees of freedom of mimo x channels with output feedback and delayed csit"):
  with members:
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "topological interference management with alternating connectivity"
    - "multiaccess channel with partially cooperating encoders and security constraints"
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "secure communication over parallel relay channel"
    - "index coding an interference alignment perspective"
    - "on achievable degrees of freedom for mimo x channels"

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)