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: "cellular underwater wireless optical cdma network potentials and challenges"
  Abstract: Underwater wireless optical communications is an emerging solution to the expanding demand for broadband links in oceans and seas. In this paper, a cellular underwater wireless optical code division multiple-access (UW-OCDMA) network is proposed to provide broadband links for commercial and military applications. The optical orthogonal codes (OOC) are employed as signature codes of underwater mobile users. Fundamental key aspects of the network such as its backhaul architecture, its potential applications and its design challenges are presented. In particular, the proposed network is used as infrastructure of centralized, decentralized and relay-assisted underwater sensor networks for high-speed real-time monitoring. Furthermore, a promising underwater localization and positioning scheme based on this cellular network is presented. Finally, probable design challenges such as cell edge coverage, blockage avoidance, power control and increasing the network capacity are addressed.

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:
    - "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"
    - "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:
    - "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"
    - "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:
    - "performance studies of underwater wireless optical communication systems with spatial diversity mimo scheme"
    - "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.NI(Networking and Internet Architecture)