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: "impact of random receiver orientation on visible light communications channel"
  Abstract: Visible Light Communications (VLC) has been studied thoroughly in recent years as an alternative or complementary technology to radio frequency communications. The reliability of VLC channels highly depends on the availability and alignment of line of sight links. In this work, we study the effect of random receiver orientation for mobile users over VLC downlink channels, which affects the existence of line of sight links and the receiver field of view. Based on the statistics of vertical receiver orientation and user mobility, we develop a unified analytical framework to characterize the statistical distribution of VLC downlink channels, which is then utilized to obtain the outage probability and the bit error rate. Our analysis is generalized for arbitrary distributions of receiver orientation/location for a single transmitter, and extended to multiple transmitter case for certain scenarios. Extensive Monte Carlo simulations show a perfect match between the analytical and the simulation data in terms of both the statistical channel distribution and the resulting bit error rate. Our results also characterize the channel attenuation due to random receiver orientation/location for various scenarios of interest.

Connected through hyperedge HE-1 (induced by source paper "noma for vlc downlink transmission with random receiver orientation"):
  with members:
    - "angle feedback for noma transmission in mmwave drone networks"
    - "modeling the random orientation of mobile devices measurement analysis and lifi use case"
    - "a software defined multi element vlc architecture"
    - "multi element vlc networks led assignment power control and optimum combining"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "non orthogonal multiple access for visible light communications"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-2 (induced by source paper "on optimizing vlc networks for downlink multi user transmission a survey"):
  with members:
    - "modeling the random orientation of mobile devices measurement analysis and lifi use case"
    - "non orthogonal multiple access for mobile vlc networks with random receiver orientation"
    - "a comparative survey of optical wireless technologies architectures and applications"
    - "dc bias and power allocation in cooperative vlc networks for joint information and energy transfer"
    - "securing visible light communication systems by beamforming in the presence of randomly distributed eavesdroppers"
    - "link selection in hybrid rf vlc systems under statistical queueing constraints"
    - "multi element vlc networks led assignment power control and optimum combining"
    - "optical non orthogonal multiple access for visible light communication"

Connected through hyperedge HE-3 (induced by source paper "non orthogonal multiple access for mobile vlc networks with random receiver orientation"):
  with members:
    - "noma for vlc downlink transmission with random receiver orientation"
    - "modeling the random orientation of mobile devices measurement analysis and lifi use case"
    - "a software defined multi element vlc architecture"
    - "multi element vlc networks led assignment power control and optimum combining"
    - "power domain non orthogonal multiple access noma in 5g systems potentials and challenges"
    - "non orthogonal multiple access for visible light communications"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"

Connected through hyperedge HE-4 (induced by source paper "modeling the random orientation of mobile devices measurement analysis and lifi use case"):
  with members:
    - "impact of device orientation on error performance of lifi systems"
    - "bidirectional user throughput maximization based on feedback reduction in lifi networks"

Connected through hyperedge HE-5 (induced by source paper "impact of device orientation on error performance of lifi systems"):
  with members:
    - "modeling the random orientation of mobile devices measurement analysis and lifi use case"
    - "bidirectional user throughput maximization based on feedback reduction in lifi networks"

Connected through hyperedge HE-6 (induced by source paper "interference characterization in downlink li fi optical attocell networks"):
  with members:
    - "coverage and rate analysis for co existing rf vlc downlink cellular 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.ET(Emerging Technologies)