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: "csi feedback reduction for mimo interference alignment"
  Abstract: Interference alignment (IA) is a linear precoding strategy that can achieve optimal capacity scaling at high SNR in interference networks. Most of the existing IA designs require full channel state information (CSI) at the transmitters, which induces a huge CSI signaling cost. Hence it is desirable to improve the feedback efficiency for IA and in this paper, we propose a novel IA scheme with a significantly reduced CSI feedback. To quantify the CSI feedback cost, we introduce a novel metric, namely the feedback dimension. This metric serves as a first-order measurement of CSI feedback overhead. Due to the partial CSI feedback constraint, conventional IA schemes can not be applied and hence, we develop a novel IA precoder/decorrelator design and establish new IA feasibility conditions. Via dynamic feedback profile design, the proposed IA scheme can also achieve a flexible tradeoff between the degree of freedom (DoF) requirements for data streams, the antenna resources and the CSI feedback cost. We show by analysis and simulations that the proposed scheme achieves substantial reductions of CSI feedback overhead under the same DoF requirement in MIMO interference networks.

Connected through hyperedge HE-1 (induced by source paper "the interference channel revisited aligning interference by adjusting receive antenna separation"):
  with members:
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "on media based modulation using rf mirrors"
    - "feasibility of interference alignment for the mimo interference channel"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "performance analysis and optimization for interference alignment over mimo interference channels with limited feedback"
    - "five disruptive technology directions for 5g"
    - "the approximate sum capacity of the symmetric gaussian k user interference channel"
    - "on feasibility of interference alignment in mimo interference networks"

Connected through hyperedge HE-2 (induced by source paper "network mimo transmitters with no csi can still be very useful"):
  with members:
    - "distributed space time interference alignment with moderately delayed csit"
    - "degrees of freedom of the k user miso interference channel with delayed local csit"
    - "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"
    - "robust precoding for network mimo with hierarchical csit"
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "fundamental limits of caching"
    - "optimal use of current and outdated channel state information degrees of freedom of the miso bc with mixed csit"
    - "interference alignment with incomplete csit sharing"

Connected through hyperedge HE-3 (induced by source paper "dof robust strategies for the k user distributed broadcast channel with weak csi"):
  with members:
    - "distributed space time interference alignment with moderately delayed csit"
    - "degrees of freedom of the k user miso interference channel with delayed local csit"
    - "robust precoding for network mimo with hierarchical csit"
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "fundamental limits of caching"
    - "optimal use of current and outdated channel state information degrees of freedom of the miso bc with mixed csit"
    - "interference alignment with incomplete csit sharing"
    - "completely stale transmitter channel state information is still very useful"

Connected through hyperedge HE-4 (induced by source paper "interference alignment with incomplete csit sharing"):
  with members:
    - "robust iterative interference alignment for cellular networks with limited feedback"
    - "the feasibility conditions for interference alignment in mimo networks"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "feedback topology designs for interference alignment in mimo interference channels"
    - "adaptive beamforming in interference networks via bi directional training"
    - "user partitioning for less overhead in mimo interference channels"
    - "interference alignment as a rank constrained rank minimization"
    - "on feasibility of interference alignment in mimo interference networks"

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)