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: "error rate analysis for peaky signaling over fading channels"
  Abstract: In this paper, the performance of signaling strategies with high peak-to-average power ratio is analyzed over both coherent and noncoherent fading channels. Two modulation schemes, namely on-off phase-shift keying (OOPSK) and on-off frequency-shift keying (OOFSK), are considered. Initially, uncoded systems are analyzed. For OOPSK and OOFSK, the optimal detector structures are identified and analytical expressions for the error probabilities are obtained for arbitrary constellation sizes. Numerical techniques are employed to compute the error probabilities. It is concluded that increasing the peakedness of the signals results in reduced error rates for a given power level and hence equivalently improves the energy efficiency for fixed error probabilities. The coded performance is also studied by analyzing the random coding error exponents achieved by OOPSK and OOFSK signaling.

Connected through hyperedge HE-1 (induced by source paper "optimizing constellations for single subcarrier intensity modulated optical systems"):
  with members:
    - "calculation of mutual information for partially coherent gaussian channels with applications to fiber optics"
    - "optimal alphabets and binary labelings for bicm at low snr"
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-2 (induced by source paper "optimizing constellations for noncoherent optical communication systems"):
  with members:
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-3 (induced by source paper "designing power efficient modulation formats for noncoherent optical systems"):
  with members:
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-4 (induced by source paper "the impact of hard decision detection on the energy efficiency of phase and frequency modulation"):
  with members:
    - "how good is phase shift keying for peak limited rayleigh fading channels in the low snr regime"
    - "noncoherent rician fading channel part ii spectral efficiency in the low power regime"

Connected through hyperedge HE-5 (induced by source paper "on the energy efficiency of orthogonal signaling"):
  with members:
    - "on off frequency shift keying for wideband fading channels"

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)