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: "advanced coordinated beamforming for the downlink of future lte cellular networks"
  Abstract: Modern cellular networks in traditional frequency bands are notoriously interference-limited, especially in urban areas, where base stations are deployed in close proximity to one another. The latest releases of LTE incorporate features for coordinating downlink transmissions as an efficient means of managing interference. Recent field trial results and theoretical studies of the performance of JT CoMP schemes revealed, however, that their gains are not as high as initially expected, despite the large coordination overhead. These schemes are known to be very sensitive to defects in synchronization or information exchange between coordinating base stations as well as uncoordinated interference. In this article, we review recent advanced CB schemes as alternatives, requiring less overhead than JT CoMP while achieving good performance in realistic conditions. By stipulating that in certain LTE scenarios of increasing interest, uncoordinated interference constitutes a major factor in the performance of CoMP techniques at large, we hereby assess the resilience of the stateof- the-art CB to uncoordinated interference. We also describe how these techniques can leverage the latest specifications of current cellular networks, and how they may perform when we consider standardized feedback and coordination. This allows us to identify some key road blocks and research directions to address as LTE evolves toward the future of mobile communications.

Connected through hyperedge HE-1 (induced by source paper "reconfigurable intelligent surfaces for energy efficiency in wireless communication"):
  with members:
    - "energy efficient multi user miso communication using low resolution large intelligent surfaces"
    - "achievable rate maximization by passive intelligent mirrors"
    - "using any surface to realize a new paradigm for wireless communications"
    - "energy efficiency of mmwave massive mimo precoding with low resolution dacs"
    - "intelligent reflecting surface enhanced wireless network via joint active and passive beamforming"
    - "deep learning coordinated beamforming for highly mobile millimeter wave systems"
    - "capacity degradation with modeling hardware impairment in large intelligent surface"
    - "asymptotically optimal estimation algorithm for the sparse signal with arbitrary distributions"

Connected through hyperedge HE-2 (induced by source paper "energy efficient multi user miso communication using low resolution large intelligent surfaces"):
  with members:
    - "achievable rate maximization by passive intelligent mirrors"
    - "using any surface to realize a new paradigm for wireless communications"
    - "deep learning coordinated beamforming for highly mobile millimeter wave systems"
    - "the potential of using large antenna arrays on intelligent surfaces"
    - "position aided beam alignment for millimeter wave backhaul systems with large phased arrays"
    - "energy efficient power control a look at 5g wireless technologies"
    - "a survey of energy efficient techniques for 5g networks and challenges ahead"
    - "increasing indoor spectrum sharing capacity using smart reflect array"

Connected through hyperedge HE-3 (induced by source paper "full duplex transmission optimization for bi directional mimo links with qos guarantees"):
  with members:
    - "hardware impairments aware transceiver design for full duplex amplify and forward mimo relaying"
    - "joint design of multi tap analog cancellation and digital beamforming for reduced complexity full duplex mimo systems"
    - "signaling design of two way mimo full duplex channel optimality under imperfect transmit front end chain"
    - "joint beamforming optimization and power control for full duplex mimo two way relay channel"
    - "reference receiver based digital self interference cancellation in mimo full duplex transceivers"
    - "on the outage probability of the full duplex interference limited relay channel"
    - "full duplex mobile device pushing the limits"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-4 (induced by source paper "joint transmitter and receiver design for pattern division multiple access"):
  with members:
    - "pattern division multiple access with large scale antenna array"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "energy efficient joint resource allocation and power control for d2d communications"
    - "design of massive mimo noma with limited feedback"
    - "on the spectral efficiency and security enhancements of noma assisted multicast unicast streaming"
    - "an overview of transmission theory and techniques of large scale antenna systems for 5g wireless communications"
    - "the application of mimo to non orthogonal multiple access"
    - "uplink contention based scma for 5g radio access"

Connected through hyperedge HE-5 (induced by source paper "on off switched interference alignment for diversity multiplexing tradeoff improvement in the 2 user x network with two antennas"):
  with members:
    - "interference aligned space time transmission with diversity for the 2 times 2 x network"
    - "interference alignment with diversity for the 2 times 2 x network with four antennas"
    - "maximum rate transmission with improved diversity gain for interference networks"
    - "secure degrees of freedom of mimo x channels with output feedback and delayed csit"
    - "simultaneous nonunique decoding is rate optimal"
    - "interference alignment and the degrees of freedom for the k user interference channel"

Connected through hyperedge HE-6 (induced by source paper "cellular network traces towards 5g usage analysis and generation"):
  with members:
    - "a sharing and competition aware framework for cellular network evolution planning"
    - "understanding mobile traffic patterns of large scale cellular towers in urban environment"

Connected through hyperedge HE-7 (induced by source paper "kpi kqi driven coordinated multipoint in 5g measurements field trials and technical solutions"):
  with members:
    - "mmwave massive mimo based wireless backhaul for the 5g ultra dense network"

Connected through hyperedge HE-8 (induced by source paper "on the robustness of coordinated beamforming to uncoordinated interference and csi uncertainty"):
  with members:
    - "modeling heterogeneous network interference using poisson point processes"
    - "fundamental limits of cooperation"

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)