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: "modeling the random orientation of mobile devices measurement analysis and lifi use case"
  Abstract: Light-fidelity (LiFi) is a networked optical wireless communication (OWC) solution for high-speed indoor connectivity for fixed and mobile optical communications. Unlike conventional radio frequency wireless systems, the OWC channel is not isotropic, meaning that the device orientation affects the channel gain significantly, particularly for mobile users. However, due to the lack of a proper model for device orientation, many studies have assumed that the receiver is vertically upward and fixed. In this paper, a novel model for device orientation based on experimental measurements of forty participants has been proposed. It is shown that the probability density function (PDF) of the polar angle can be modeled either based on a Laplace (for static users) or a Gaussian (for mobile users) distribution. In addition, a closed-form expression is obtained for the PDF of the cosine of the incidence angle based on which line-of-sight (LOS) channel gain is described in OWC channels. An approximation of this PDF based on the truncated Laplace is proposed and the accuracy of this approximation is confirmed by the Kolmogorov-Smirnov distance (KSD). Moreover, the statistics of the LOS channel gain are calculated and the random orientation of a user equipment (UE) is modeled as a random process. The influence of the random orientation on signal-to-noise-ratio (SNR) performance of OWC systems has been evaluated. Finally, an orientation-based random waypoint (ORWP) mobility model is proposed by considering the random orientation of the UE during the user's movement. The performance of ORWP is assessed on the handover rate and it is shown that it is important to take the random orientation into account.

Connected through hyperedge HE-1 (induced by source paper "hybrid lifi and wifi networks a survey"):
  with members:
    - "impact of device orientation on error performance of lifi systems"
    - "bidirectional user throughput maximization based on feedback reduction in lifi networks"
    - "ieee 802 11ax high efficiency wlans"
    - "handover management in 5g and beyond a topology aware skipping approach"
    - "optical adaptive precoding for visible light communications"
    - "an overview of load balancing in hetnets old myths and open problems"
    - "on the accuracy of the wyner model in cellular networks"
    - "fundamental limits of wideband localization part i a general framework"

Connected through hyperedge HE-2 (induced by source paper "noma for vlc downlink transmission with random receiver orientation"):
  with members:
    - "angle feedback for noma transmission in mmwave drone networks"
    - "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"
    - "impact of random receiver orientation on visible light communications channel"
    - "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-3 (induced by source paper "physical layer performance evaluation of wireless infrared based lifi uplink"):
  with members:
    - "coverage and spectral efficiency of indoor mmwave networks with ceiling mounted access points"

Connected through hyperedge HE-4 (induced by source paper "on optimizing vlc networks for downlink multi user transmission a survey"):
  with members:
    - "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"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"

Connected through hyperedge HE-5 (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"
    - "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"
    - "impact of random receiver orientation on visible light communications channel"
    - "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-6 (induced by source paper "impact of device orientation on error performance of lifi systems"):
  with members:
    - "impact of random receiver orientation on visible light communications channel"
    - "bidirectional user throughput maximization based on feedback reduction in lifi networks"

Connected through hyperedge HE-7 (induced by source paper "impact of random receiver orientation on visible light communications channel"):
  with members:
    - "impact of device orientation on error performance of lifi systems"
    - "pixelated vlc backscattering for self charging indoor iot devices"
    - "a software defined multi element vlc architecture"
    - "multi element vlc networks led assignment power control and optimum combining"

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)