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: "the degrees of freedom region and interference alignment for the mimo interference channel with delayed csi"
  Abstract: The degrees of freedom (DoF) region of the 2-user multiple-antenna or MIMO (multiple-input, multiple-output) interference channel (IC) is studied under fast fading and the assumption of {\em delayed} channel state information (CSI) wherein all terminals know all (or certain) channel matrices perfectly, but with a delay, and each receiver in addition knows its own incoming channels instantaneously. The general MIMO IC is considered with an arbitrary number of antennas at each of the four terminals. Dividing it into several classes depending on the relation between the numbers of antennas at the four terminals, the fundamental DoF regions are characterized under the delayed CSI assumption for {\em all} possible values of number of antennas at the four terminals. In particular, an outer bound on the DoF region of the general MIMO IC is derived. This bound is then shown to be tight for all MIMO ICs by developing interference alignment based achievability schemes for each class. A comparison of these DoF regions under the delayed CSI assumption is made with those of the idealistic `perfect CSI' assumption where perfect and instantaneous CSI is available at all terminals on the one hand and with the DoF regions of the conservative `no CSI' assumption on the other, where CSI is available at the receivers but not at all at the transmitters.

Connected through hyperedge HE-1 (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"
    - "on x channels with feedback and delayed csi"
    - "the degrees of freedom region of the mimo interference channel with shannon feedback"
    - "interference alignment for the mimo interference channel with delayed local csit"
    - "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-2 (induced by source paper "guiding blind transmitters degrees of freedom optimal interference alignment using relays"):
  with members:
    - "degrees of freedom region of the mimo interference channel with output feedback and delayed csit"
    - "interference alignment for the mimo interference channel with delayed local csit"
    - "the gaussian interference relay channel improved achievable rates and sum rate upperbounds using a potent relay"
    - "completely stale transmitter channel state information is still very useful"
    - "symmetric capacity of the gaussian interference channel with an out of band relay to within 1 15 bits"
    - "interference channel with an out of band relay"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"
    - "degrees of freedom of the k user m times n mimo interference channel"

Connected through hyperedge HE-3 (induced by source paper "secrecy degrees of freedom of mimo broadcast channels with delayed csit"):
  with members:
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "the degrees of freedom regions of two user and certain three user mimo broadcast channels with delayed csit"
    - "completely stale transmitter channel state information is still very useful"
    - "retrospective interference alignment"
    - "on the secrecy degress of freedom of the multi antenna block fading wiretap channels"
    - "on the compound mimo 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-4 (induced by source paper "on the secrecy degrees of freedom of multi antenna wiretap channels with delayed csit"):
  with members:
    - "the degrees of freedom regions of two user and certain three user mimo broadcast channels with delayed csit"
    - "retrospective interference alignment"
    - "interference alignment for the multi antenna compound wiretap channel"
    - "on the secrecy degress of freedom of the multi antenna block fading wiretap channels"
    - "on the compound mimo broadcast channels with confidential messages"

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)