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: "information exchange limits in cooperative mimo networks"
  Abstract: Concurrent presence of inter-cell and intra-cell interferences constitutes a major impediment to reliable downlink transmission in multi-cell multiuser networks. Harnessing such interferences largely hinges on two levels of information exchange in the network: one from the users to the base-stations (feedback) and the other one among the base-stations (cooperation). We demonstrate that exchanging a finite number of bits across the network, in the form of feedback and cooperation, is adequate for achieving the optimal capacity scaling. We also show that the average level of information exchange is independent of the number of users in the network. This level of information exchange is considerably less than that required by the existing coordination strategies which necessitate exchanging infinite bits across the network for achieving the optimal sum-rate capacity scaling. The results provided rely on a constructive proof.

Connected through hyperedge HE-1 (induced by source paper "spatial csit allocation policies for network mimo channels"):
  with members:
    - "joint precoding and multivariate backhaul compression for the downlink of cloud radio access networks"
    - "csi sharing strategies for transmitter cooperation in wireless networks"
    - "network mimo with linear zero forcing beamforming large system analysis impact of channel estimation and reduced complexity scheduling"
    - "fundamental limits of cooperation"
    - "adaptive limited feedback for sum rate maximizing beamforming in cooperative multicell systems"
    - "adaptive spatial intercell interference cancellation in multicell wireless networks"
    - "generalized degrees of freedom of the symmetric gaussian k user interference channel"
    - "gaussian interference channel capacity to within one bit"

Connected through hyperedge HE-2 (induced by source paper "an analytical framework for heterogeneous partial feedback design in heterogeneous multicell ofdma networks"):
  with members:
    - "sum rate analysis of a reduced feedback ofdma downlink system employing joint scheduling and diversity"
    - "a tutorial on the optimization of amplify and forward mimo relay systems"
    - "modeling and analysis of k tier downlink heterogeneous cellular networks"
    - "refim a practical interference management in heterogeneous wireless access networks"
    - "downlink interference alignment"
    - "adaptive limited feedback for sum rate maximizing beamforming in cooperative multicell systems"
    - "resource allocation for downlink cellular ofdma systems part i optimal allocation"

Connected through hyperedge HE-3 (induced by source paper "multicell random beamforming with cdf based scheduling exact rate and scaling laws"):
  with members:
    - "an analytical framework for heterogeneous partial feedback design in heterogeneous multicell ofdma networks"
    - "random beamforming with heterogeneous users and selective feedback individual sum rate and individual scaling laws"

Connected through hyperedge HE-4 (induced by source paper "degrees of freedom of the network mimo channel with distributed csi"):
  with members:
    - "network mimo with linear zero forcing beamforming large system analysis impact of channel estimation and reduced complexity scheduling"
    - "adaptive bit partitioning for multicell intercell interference nulling with delayed limited feedback"
    - "optimized data sharing in multicell mimo with finite backhaul capacity"
    - "robust linear precoder design for multi cell downlink transmission"
    - "completely stale transmitter channel state information is still very useful"
    - "adaptive limited feedback for sum rate maximizing beamforming in cooperative multicell systems"
    - "capacity of a multiple antenna fading channel with a quantized precoding matrix"
    - "adaptive spatial intercell interference cancellation in multicell wireless 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)