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: "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"
  Abstract: In this paper, we analytically study the performance of multiple-input multiple-output underwater wireless optical communication (MIMO-UWOC) systems with on-off keying (OOK) modulation. To mitigate turbulence-induced fading, which is amongst the major degrading effects of underwater channels on the propagating optical signal, we use spatial diversity over UWOC links. Furthermore, the effects of absorption and scattering are considered in our analysis. We analytically obtain the exact and the upper bound bit error rate (BER) expressions for both optimal and equal gain combining. In order to more effectively calculate the system BER, we apply Gauss-Hermite quadrature formula as well as approximation to the sum of log-normal random variables. We also apply photon-counting method to evaluate the system BER in the presence of shot noise. Our numerical results indicate an excellent match between the exact and the upper bound BER curves. Also well matches between analytical results and numerical simulations confirm the accuracy of our derived expressions. Moreover, our results show that spatial diversity can considerably improve the system performance, especially for more turbulent channels, e.g., a $3\times1$ MISO transmission in a $25$ m coastal water link with log-amplitude variance of $0.16$ can introduce $8$ dB performance improvement at the BER of $10^{-9}$.

Connected through hyperedge HE-1 (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"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

Connected through hyperedge HE-2 (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"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

Connected through hyperedge HE-3 (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"
    - "on the ber of multiple input multiple output underwater wireless optical communication systems"

Connected through hyperedge HE-4 (induced by source paper "on the ber of multiple input multiple output underwater wireless optical communication systems"):
  with members:
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"

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)