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: "path loss shadow fading and line of sight probability models for 5g urban macro cellular scenarios"
  Abstract: This paper presents key parameters including the line-of-sight (LOS) probability, large-scale path loss, and shadow fading models for the design of future fifth generation (5G) wireless communication systems in urban macro- cellular (UMa) scenarios, using the data obtained from propagation measurements at 38 GHz in Austin, US, and at 2, 10, 18, and 28 GHz in Aalborg, Denmark. A comparison of different LOS probability models is performed for the Aalborg environment. Alpha- betagamma and close-in reference distance path loss models are studied in depth to show their value in channel modeling. Additionally, both single-slope and dual-slope omnidirectional path loss models are investigated to analyze and contrast their root-mean-square (RMS) errors on measured path loss values. While the results show that the dual-slope large-scale path loss model can slightly reduce RMS errors compared to its singleslope counterpart in non-line-of-sight (NLOS) conditions, the improvement is not significant enough to warrant adopting the dual- slope path loss model. Furthermore, the shadow fading magnitude versus distance is explored, showing a slight increasing trend in LOS and a decreasing trend in NLOS based on the Aalborg data, but more measurements are necessary to gain a better knowledge of the UMa channels at centimeter- and millimeter-wave frequency bands.

Connected through hyperedge HE-1 (induced by source paper "on the spectral efficiency for massive mimo systems with imperfect spacial covariance information"):
  with members:
    - "covariance matrix estimation for massive mimo"
    - "covariance matrix estimation in massive mimo"
    - "massive mimo has unlimited capacity"
    - "superimposed pilots are superior for mitigating pilot contamination in massive mimo"
    - "massive mimo pilot decontamination and channel interpolation via wideband sparse channel estimation"
    - "massive mimo with imperfect channel covariance information"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"

Connected through hyperedge HE-2 (induced by source paper "overview of millimeter wave communications for fifth generation 5g wireless networks with a focus on propagation models"):
  with members:
    - "indoor office wideband penetration loss measurements at 73 ghz"
    - "study on 3gpp rural macrocell path loss models for millimeter wave wireless communications"
    - "investigation and comparison of 3gpp and nyusim channel models for 5g wireless communications"
    - "millimeter wave small scale spatial statistics in an urban microcell scenario"
    - "a novel millimeter wave channel simulator and applications for 5g wireless communications"
    - "small scale local area and transitional millimeter wave propagation for 5g communications"
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "millimeter wave human blockage at 73 ghz with a simple double knife edge diffraction model and extension for directional antennas"

Connected through hyperedge HE-3 (induced by source paper "the connectivity of millimeter wave networks in urban environments modeled using random lattices"):
  with members:
    - "modeling and analyzing millimeter wave cellular systems"
    - "beam based stochastic model of the coverage probability in 5g millimeter wave systems"
    - "stochastic geometry modeling and analysis of multi tier millimeter wave cellular networks"
    - "connectivity scaling laws in wireless networks"
    - "how does mobility affect the connectivity of interference limited ad hoc networks"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "what will 5g be"

Connected through hyperedge HE-4 (induced by source paper "investigation of prediction accuracy sensitivity and parameter stability of large scale propagation path loss models for 5g wireless communications"):
  with members:
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "a prediction study of path loss models from 2 73 5 ghz in an urban macro environment"
    - "indoor 5g 3gpp like channel models for office and shopping mall environments"
    - "propagation path loss models for 5g urban micro and macro cellular scenarios"
    - "local multipath model parameters for generating 5g millimeter wave 3gpp like channel impulse response"
    - "millimeter wave distance dependent large scale propagation measurements and path loss models for outdoor and indoor 5g systems"
    - "probabilistic omnidirectional path loss models for millimeter wave outdoor communications"
    - "28 ghz and 73 ghz millimeter wave indoor propagation measurements and path loss models"

Connected through hyperedge HE-5 (induced by source paper "indoor 5g 3gpp like channel models for office and shopping mall environments"):
  with members:
    - "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"
    - "a prediction study of path loss models from 2 73 5 ghz in an urban macro environment"
    - "propagation path loss models for 5g urban micro and macro cellular scenarios"
    - "local multipath model parameters for generating 5g millimeter wave 3gpp like channel impulse response"
    - "probabilistic omnidirectional path loss models for millimeter wave outdoor communications"
    - "3 d statistical channel model for millimeter wave outdoor mobile broadband communications"

Connected through hyperedge HE-6 (induced by source paper "5g 3gpp like channel models for outdoor urban microcellular and macrocellular environments"):
  with members:
    - "a prediction study of path loss models from 2 73 5 ghz in an urban macro environment"
    - "propagation path loss models for 5g urban micro and macro cellular scenarios"
    - "local multipath model parameters for generating 5g millimeter wave 3gpp like channel impulse response"
    - "probabilistic omnidirectional path loss models for millimeter wave outdoor communications"
    - "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)