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: "isotropic mimo interference channels without csit the loss of degrees of freedom"
  Abstract: This paper studies two-user MIMO interference channel with isotropic fading. We assume that users are equipped with arbitrary number of antennas and the channel state information (CSI) is available at receivers only. An outer bound is obtained for the degree of freedom region, which suggests the loss of degrees of freedom due to the lack of CSI at transmitters under many circumstances.

Connected through hyperedge HE-1 (induced by source paper "elements of cellular blind interference alignment aligned frequency reuse wireless index coding and interference diversity"):
  with members:
    - "index coding an interference alignment perspective"
    - "lexicographic products and the power of non linear network coding"
    - "completely stale transmitter channel state information is still very useful"
    - "index coding via linear programming"
    - "the degrees of freedom regions of mimo broadcast interference and cognitive radio channels with no csit"
    - "on the index coding problem and its relation to network coding and matroid theory"
    - "on the capacity of fading mimo broadcast channels with imperfect transmitter side information"

Connected through hyperedge HE-2 (induced by source paper "degrees of freedom region for an interference network with general message demands"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "degrees of freedom regions of two user mimo z and full interference channels the benefit of reconfigurable antennas"
    - "interference alignment for the k user mimo interference channel"
    - "the approximate capacity of the many to one and one to many gaussian interference channels"
    - "aiming perfectly in the dark blind interference alignment through staggered antenna switching"
    - "capacity regions and sum rate capacities of vector gaussian interference channels"
    - "on feasibility of interference alignment in mimo interference networks"
    - "on the degrees of freedom regions of two user mimo z and full interference channels with reconfigurable antennas"

Connected through hyperedge HE-3 (induced by source paper "the degrees of freedom region and interference alignment for the mimo interference channel with delayed csi"):
  with members:
    - "completely stale transmitter channel state information is still very useful"
    - "retrospective interference alignment"
    - "exploiting channel correlations simple interference alignment schemes with no csit"
    - "the degrees of freedom region of the mimo cognitive interference channel with no csit"
    - "the degrees of freedom of mimo interference channels without state information at transmitters"
    - "interference alignment under limited feedback for mimo interference channels"
    - "on degrees of freedom region of mimo networks without csit"
    - "a new outer bound and the noisy interference sum rate capacity for gaussian interference channels"

Connected through hyperedge HE-4 (induced by source paper "the degrees of freedom of the 2 hop 2 user interference channel with feedback"):
  with members:
    - "completely stale transmitter channel state information is still very useful"
    - "retrospective interference alignment"
    - "approximately achieving gaussian relay network capacity with lattice codes"
    - "capacity bounds for two hop interference networks"
    - "on degrees of freedom region of mimo networks without csit"
    - "the degrees of freedom regions of mimo broadcast interference and cognitive radio channels with no csit"
    - "capacity of linear two hop mesh networks with rate splitting decode and forward relaying and cooperation"
    - "gaussian interference channel capacity to within one bit"

Connected through hyperedge HE-5 (induced by source paper "a new outer bound via interference localization and the degrees of freedom regions of mimo interference networks with no csit"):
  with members:
    - "the degrees of freedom of mimo interference channels without state information at transmitters"
    - "on degrees of freedom region of mimo networks without csit"
    - "the degrees of freedom regions of mimo broadcast interference and cognitive radio channels with no csit"
    - "degrees of freedom of the mimo interference channel with cooperation and cognition"
    - "gaussian interference channel capacity to within one bit"

Connected through hyperedge HE-6 (induced by source paper "degrees of freedom regions of two user mimo z and full interference channels the benefit of reconfigurable antennas"):
  with members:
    - "wireless network information flow a deterministic approach"
    - "the approximate capacity of the many to one and one to many gaussian interference channels"
    - "exploiting channel correlations simple interference alignment schemes with no csit"
    - "capacity regions and sum rate capacities of vector gaussian interference channels"
    - "the degrees of freedom of mimo interference channels without state information at transmitters"
    - "mimo z interference channels capacity under strong and noisy interference"
    - "ergodic fading one sided interference channels without state information at transmitters"
    - "on degrees of freedom region of mimo networks without csit"

Connected through hyperedge HE-7 (induced by source paper "on the degrees of freedom regions of two user mimo z and full interference channels with reconfigurable antennas"):
  with members:
    - "wireless network information flow a deterministic approach"
    - "the approximate capacity of the many to one and one to many gaussian interference channels"
    - "aiming perfectly in the dark blind interference alignment through staggered antenna switching"
    - "exploiting channel correlations simple interference alignment schemes with no csit"
    - "capacity regions and sum rate capacities of vector gaussian interference channels"
    - "mimo z interference channels capacity under strong and noisy interference"
    - "ergodic fading one sided interference channels without state information at transmitters"
    - "on degrees of freedom region of mimo networks without csit"

Connected through hyperedge HE-8 (induced by source paper "user partitioning for less overhead in mimo interference channels"):
  with members:
    - "interference alignment for the k user mimo interference channel"
    - "cooperative algorithms for mimo interference channels"
    - "exploiting channel correlations simple interference alignment schemes with no csit"
    - "on feasibility of interference alignment in mimo interference networks"
    - "performance of interference alignment in clustered wireless ad hoc networks"
    - "mode switching for the multi antenna broadcast channel based on delay and channel quantization"
    - "on feasibility of interference alignment in mimo interference networks"
    - "on degrees of freedom region of mimo networks without csit"

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)