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 distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles"
  Abstract: In this paper, we experimentally investigate the statistical distribution of intensity fluctuations for underwater wireless optical channels under different channel conditions, namely fresh and salty underwater channels with and without air bubbles. To do so, we first measure the received optical signal with a large number of samples. Based on the normalized acquired data the channel coherence time and the fluctuations probability density function (PDF) are obtained for different channel scenarios. Our experimental results show that salt attenuates the received signal while air bubbles mainly introduce severe intensity fluctuations. Moreover, we observe that log-normal distribution precisely fits the acquired data PDF for scintillation index ($\sigma^2_I$) values less than $0.1$, while Gamma-Gamma and K distributions aptly predict the intensity fluctuations for $\sigma^2_I>1$. Since neither of these distributions are capable of predicting the received irradiance for $0.1<\sigma^2_I<1$, we propose a combination of an exponential and a log-normal distributions to perfectly describe the acquired data PDF for such regimes of scintillation index.

Connected through hyperedge HE-1 (induced by source paper "statistical studies of fading in underwater wireless optical channels in the presence of air bubble temperature and salinity random variations long version"):
  with members:
    - "mimo underwater visible light communications comprehensive channel study performance analysis and multiple symbol detection"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

Connected through hyperedge HE-2 (induced by source paper "unified statistical channel model for turbulence induced fading in underwater wireless optical communication systems"):
  with members:
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-3 (induced by source paper "mimo underwater visible light communications comprehensive channel study performance analysis and multiple symbol detection"):
  with members:
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

Connected through hyperedge HE-4 (induced by source paper "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"):
  with members:
    - "performance analysis of multi hop underwater wireless optical communication systems extended version"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

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)