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: "demonstration of fully nonlinear spectrum modulated system in the highly nonlinear optical transmission regime"
  Abstract: We report a 3 dB increase in the nonlinear threshold of a 64*0.5Gbaud 16-QAM continuous-nonlinear-spectrum modulated signal by nonlinear multiplexing with QPSK modulated multi-solitons, showing the first ever fully nonlinear-spectrum modulated system in the highly nonlinear regime.

Connected through hyperedge HE-1 (induced by source paper "nonlinear fourier transform of truncated multi soliton pulses"):
  with members:
    - "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing"
    - "probabilistic eigenvalue shaping for nonlinear fourier transform transmission"
    - "capacity lower bounds of the noncentral chi channel with applications to soliton amplitude modulation"
    - "nonlinear frequency division multiplexing"
    - "fast numerical nonlinear fourier transforms"

Connected through hyperedge HE-2 (induced by source paper "polarization division multiplexing based on the nonlinear fourier transform"):
  with members:
    - "signaling on the continuous spectrum of nonlinear optical fiber"
    - "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing"
    - "fast numerical nonlinear fourier transforms"
    - "information transmission using the nonlinear fourier transform part ii numerical methods"
    - "information transmission using the nonlinear fourier transform part i mathematical tools"
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-3 (induced by source paper "probabilistic eigenvalue shaping for nonlinear fourier transform transmission"):
  with members:
    - "capacity lower bounds of the noncentral chi channel with applications to soliton amplitude modulation"
    - "experimental demonstration of nonlinear frequency division multiplexed transmission"

Connected through hyperedge HE-4 (induced by source paper "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing"):
  with members:
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-5 (induced by source paper "linear and nonlinear frequency division multiplexing"):
  with members:
    - "a novel detection strategy for nonlinear frequency division multiplexing"
    - "decision feedback detection strategy for nonlinear frequency division multiplexing"
    - "communication using eigenvalues of higher multiplicity of the nonlinear fourier transform"
    - "the kolmogorov zakharov model for optical fiber communication"
    - "correlated eigenvalues optical communications"
    - "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing"
    - "polarization division multiplexing based on the nonlinear fourier transform"
    - "nonlinear frequency division multiplexing in the focusing regime"

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)