human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "polarization division multiplexing based on the nonlinear fourier transform"):
  Abstract: Polarization-division multiplexed (PDM) transmission based on the nonlinear Fourier transform (NFT) is proposed for optical fiber communication. The NFT algorithms are generalized from the scalar nonlinear Schrodinger equation for one polarization to the Manakov system for two polarizations. The transmission performance of the PDM nonlinear frequency-division multiplexing (NFDM) and PDM orthogonal frequency-division multiplexing (OFDM) are determined. It is shown that the transmission performance in terms of Q-factor is approximately the same in PDM-NFDM and single polarization NFDM at twice the data rate and that the polarization-mode dispersion does not seriously degrade system performance. Compared with PDM-OFDM, PDM-NFDM achieves a Q-factor gain of 6.4 dB. The theory can be generalized to multi-mode fibers in the strong coupling regime, paving the way for the application of the NFT to address the nonlinear effects in space-division multiplexing.

Includes members:
  Member "signaling on the continuous spectrum of nonlinear optical fiber":
    also connected through other hyperedges:
      (none)
  Member "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "nonlinear fourier transform of truncated multi soliton pulses")
  Member "demonstration of fully nonlinear spectrum modulated system in the highly nonlinear optical transmission regime":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "nonlinear fourier transform of truncated multi soliton pulses")
  Member "fast numerical nonlinear fourier transforms":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "a signal space distance measure for nondispersive optical fiber")
  Member "information transmission using the nonlinear fourier transform part ii numerical methods":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "the kolmogorov zakharov model for optical fiber communication")
  Member "information transmission using the nonlinear fourier transform part i mathematical tools":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "efficient nonlinear fourier transform algorithms of order four on equispaced grid")
  Member "information transmission using the nonlinear fourier transform part iii spectrum modulation":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "a signal space distance measure for nondispersive optical fiber")

Question: Please tell me which class the source paper 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)