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: "on the ber of multiple input multiple output underwater wireless optical communication systems"
  Abstract: In this paper we analyze and investigate the bit error rate (BER) performance of multiple-input multiple-output underwater wireless optical communication (MIMO-UWOC) systems. In addition to exact BER expressions, we also obtain an upper bound on the system BER. To effectively estimate the BER expressions, we use Gauss-Hermite quadrature formula as well as approximation to the sum of log-normal random variables. We confirm the accuracy of our analytical expressions by evaluating the BER through photon-counting approach. Our simulation results show that MIMO technique can mitigate the channel turbulence-induced fading and consequently, can partially extend the viable communication range, especially for channels with stronger turbulence.

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"
    - "statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"

Connected through hyperedge HE-2 (induced by source paper "mimo underwater visible light communications comprehensive channel study performance analysis and multiple symbol detection"):
  with members:
    - "statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"

Connected through hyperedge HE-3 (induced by source paper "statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles"):
  with members:
    - "cellular underwater wireless optical cdma network potentials and challenges"
    - "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"
    - "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"

Connected through hyperedge HE-4 (induced by source paper "performance analysis of multi hop underwater wireless optical communication systems extended version"):
  with members:
    - "cellular underwater wireless optical cdma network potentials and challenges"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"

Connected through hyperedge HE-5 (induced by source paper "cellular underwater wireless optical cdma network potentials and challenges"):
  with members:
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "adaptive mode selection and power allocation in bidirectional buffer aided relay networks"

Connected through hyperedge HE-6 (induced by source paper "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"):
  with members:
    - "statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles"
    - "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"

Connected through hyperedge HE-7 (induced by source paper "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"):
  with members:
    - "cellular underwater wireless optical cdma network potentials and challenges"
    - "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"

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)