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: "degrees of freedom region of the mimo x channel with an arbitrary number of antennas"
  Abstract: We characterize the total degrees of freedom (DoF) of the full-rank MIMO X channel with arbitrary number of antennas at each node. We elucidate that the existing outer bound is tight for any antenna configuration and provide transmit and receive filter designs that attain this outer bound. The proposed achievable scheme exploits channel extensions in terms of both, symbol and asymmetric complex signaling when the communication is carried out over a constant channel case, and is also applicable to time varying channels. The proposed scheme represents a general framework for the derivation of the total DoF of any two-by-two multiuser channels. Furthermore, the rank-deficient MIMO channels case is naturally addressed, and it is shown that the total DoF of the interference (IC) and MIMO X channels are in general superior to the full rank MIMO case

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"
    - "on x channels with feedback and delayed csi"
    - "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 "degrees of freedom of the mimo 2x2 interference network with general message sets"):
  with members:
    - "the capacity region of the mimo interference channel and its reciprocity to within a constant gap"
    - "degrees of freedom of the mimo interference channel with cooperation and cognition"
    - "interference channels with common information"

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)