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Center node: "multi user mimo with outdated csi training feedback and scheduling"
  Abstract: Conventional MU-MIMO techniques, e.g. Linear Zero-Forced Beamforming (LZFB), require sufficiently accurate channel state information at the transmitter (CSIT) in order to realize spectral efficient transmission (degree of freedom gains). In practical settings, however, CSIT accuracy can be limited by a number of issues including CSI estimation, CSI feedback delay between user terminals to base stations, and the time/frequency coherence of the channel. The latter aspects of CSIT-feedback delay and channel-dynamics can lead to significant challenges in the deployment of efficient MU-MIMO systems. Recently it has been shown by Maddah-Ali and Tse (MAT) that degree of freedom gains can be realized by MU-MIMO even when the knowledge of CSIT is completely outdated. Specifically, outdated CSIT, albeit perfect CSIT, is known for transmissions only after they have taken place. This aspect of insensitivity to CSIT-feedback delay is of particular interest since it allows one to reconsider MU-MIMO design in dynamic channel conditions. Indeed, as we show, with appropriate scheduling, and even in the context of CSI estimation and feedback errors, the proposed MAT scheme can have performance advantages over conventional MU-MIMO in such scenarios.

Connected through hyperedge HE-1 (induced by source paper "on the capacity and degrees of freedom regions of two user mimo interference channels with limited receiver cooperation"):
  with members:
    - "leveraging physical layer capabilites distributed scheduling in interference networks with local views"
    - "a survey on device to device communication in cellular networks"
    - "on the capacity region and the generalized degrees of freedom region for the mimo interference channel with feedback"
    - "fundamental limits of cooperation"
    - "the capacity region of the mimo interference channel and its reciprocity to within a constant gap"
    - "on achieving local view capacity via maximal independent graph scheduling"
    - "interference channels with source cooperation"
    - "interference channels with destination cooperation"

Connected through hyperedge HE-2 (induced by source paper "toward the performance vs feedback tradeoff for the two user miso broadcast channel"):
  with members:
    - "capacity results for binary fading interference channels with delayed csit"
    - "the degrees of freedom region of temporally correlated mimo networks with delayed csit"
    - "on the degrees of freedom of the k user time correlated broadcast channel with delayed csit"
    - "imperfect and unmatched csit is still useful for the frequency correlated miso broadcast channel"
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "on the fundamental feedback vs performance tradeoff over the miso bc with imperfect and delayed csit"
    - "degrees of freedom region of the miso broadcast channel with general mixed csit"
    - "optimal use of current and outdated channel state information degrees of freedom of the miso bc with mixed csit"

Connected through hyperedge HE-3 (induced by source paper "on the capacity region and the generalized degrees of freedom region for the mimo interference channel with feedback"):
  with members:
    - "capacity of all nine models of channel output feedback for the two user interference channel"
    - "sum capacity of interference channels with a local view impact of distributed decisions"
    - "fundamental limits of cooperation"
    - "the capacity region of the mimo interference channel and its reciprocity to within a constant gap"
    - "on achieving local view capacity via maximal independent graph scheduling"
    - "interference channels with rate limited feedback"
    - "the approximate capacity of the many to one and one to many gaussian interference channels"
    - "capacity regions and sum rate capacities of vector gaussian interference channels"

Connected through hyperedge HE-4 (induced by source paper "exploiting hybrid channel information for downlink multi user mimo scheduling"):
  with members:
    - "precoder design for physical layer multicasting"
    - "on the degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "joint scheduling and arq for mu mimo downlink in the presence of inter cell interference"
    - "completely stale transmitter channel state information is still very useful"
    - "mimo downlink scheduling with non perfect channel state knowledge"
    - "multiuser mimo achievable rates with downlink training and channel state feedback"

Connected through hyperedge HE-5 (induced by source paper "effects of channel aging in massive mimo systems"):
  with members:
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "massive mimo how many antennas do we need"
    - "mode switching for the multi antenna broadcast channel based on delay and channel quantization"
    - "pilot contamination and precoding in multi cell tdd systems"
    - "multiuser mimo achievable rates with downlink training and channel state feedback"

Connected through hyperedge HE-6 (induced by source paper "miso broadcast channel with delayed and evolving csit"):
  with members:
    - "degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "degrees of freedom region of the miso broadcast channel with general mixed csit"
    - "optimal use of current and outdated channel state information degrees of freedom of the miso bc with mixed csit"
    - "on the degrees of freedom of time correlated miso broadcast channel with delayed csit"
    - "imperfect delayed csit can be as useful as perfect delayed csit dof analysis and constructions for the bc"
    - "not too delayed csit achieves the optimal degrees of freedom"
    - "on the synergistic benefits of alternating csit for the miso bc"
    - "broadcast channels with delayed finite rate feedback predict or observe"

Connected through hyperedge HE-7 (induced by source paper "precoding methods for miso broadcast channel with delayed csit"):
  with members:
    - "interference alignment for the mimo interference channel with delayed local csit"
    - "completely stale transmitter channel state information is still very useful"
    - "cooperative algorithms for mimo interference channels"
    - "balancing egoism and altruism on the interference channel the mimo case"

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)