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: "statistical channel model with multi frequency and arbitrary antenna beamwidth for millimeter wave outdoor communications"
  Abstract: This paper presents a 3-dimensional millimeter-wave statistical channel impulse response model from 28 GHz and 73 GHz ultrawideband propagation measurements. An accurate 3GPP-like channel model that supports arbitrary carrier frequency, RF bandwidth, and antenna beamwidth (for both omnidirectional and arbitrary directional antennas), is provided. Time cluster and spatial lobe model parameters are extracted from empirical distributions from field measurements. A step-by-step modeling procedure for generating channel coefficients is shown to agree with statistics from the field measurements, thus confirming that the statistical channel model faithfully recreates spatial and temporal channel impulse responses for use in millimeter-wave 5G air interface designs.

Connected through hyperedge HE-1 (induced by source paper "on clustered statistical mimo millimeter wave channel simulation"):
  with members:
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "frequency selective hybrid precoding for limited feedback millimeter wave systems"
    - "mimo channel modeling and capacity analysis for 5g millimeter wave wireless systems"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "what will 5g be"
    - "spatially sparse precoding in millimeter wave mimo systems"
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-2 (induced by source paper "on the spatial separation of multi user channels using 73 ghz statistical channel models"):
  with members:
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "28 ghz millimeter wave ultrawideband small scale fading models in wireless channels"
    - "on clustered statistical mimo millimeter wave channel simulation"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"
    - "channel hardening exploiting message passing chemp receiver in large scale mimo systems"
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-3 (induced by source paper "multiuser separation and performance analysis of millimeter wave channels with linear precoding"):
  with members:
    - "on the spatial separation of multi user channels using 73 ghz statistical channel models"
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "on clustered statistical mimo millimeter wave channel simulation"
    - "channel hardening exploiting message passing chemp receiver in large scale mimo systems"
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-4 (induced by source paper "intra cluster characteristics of 28 ghz wireless channel in urban micro street canyon"):
  with members:
    - "what will 5g be"
    - "millimeter wave channel modeling and cellular capacity evaluation"

Connected through hyperedge HE-5 (induced by source paper "28 ghz millimeter wave ultrawideband small scale fading models in wireless channels"):
  with members:
    - "mimo channel modeling and capacity analysis for 5g millimeter wave wireless systems"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"

Connected through hyperedge HE-6 (induced by source paper "mimo channel modeling and capacity analysis for 5g millimeter wave wireless systems"):
  with members:
    - "28 ghz millimeter wave ultrawideband small scale fading models in wireless channels"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"
    - "massive mimo for next generation wireless systems"
    - "joint spatial division and multiplexing for mm wave channels"

Connected through hyperedge HE-7 (induced by source paper "local multipath model parameters for generating 5g millimeter wave 3gpp like channel impulse response"):
  with members:
    - "28 ghz millimeter wave ultrawideband small scale fading models in wireless channels"
    - "exploiting directionality for millimeter wave wireless system improvement"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"

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)