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: "quaternary constant amplitude codes for multicode cdma"
  Abstract: A constant-amplitude code is a code that reduces the peak-to-average power ratio (PAPR) in multicode code-division multiple access (MC-CDMA) systems to the favorable value 1. In this paper quaternary constant-amplitude codes (codes over Z_4) of length 2^m with error-correction capabilities are studied. These codes exist for every positive integer m, while binary constant-amplitude codes cannot exist if m is odd. Every word of such a code corresponds to a function from the binary m-tuples to Z_4 having the bent property, i.e., its Fourier transform has magnitudes 2^{m/2}. Several constructions of such functions are presented, which are exploited in connection with algebraic codes over Z_4 (in particular quaternary Reed-Muller, Kerdock, and Delsarte-Goethals codes) to construct families of quaternary constant-amplitude codes. Mappings from binary to quaternary constant-amplitude codes are presented as well.

Connected through hyperedge HE-1 (induced by source paper "new characterizations for the multi output correlation immune boolean functions"):
  with members:
    - "the fourier spectral characterization for the correlation immune functions over fp"

Connected through hyperedge HE-2 (induced by source paper "construction methods for generalized bent functions"):
  with members:
    - "decomposing generalized bent and hyperbent functions"
    - "generalized bent functions and their gray images"
    - "complementary sets generalized reed muller codes and power control for ofdm"

Connected through hyperedge HE-3 (induced by source paper "full characterization of generalized bent functions as semi bent spaces their dual and the gray image"):
  with members:
    - "decomposing generalized bent and hyperbent functions"
    - "nonexistence of generalized bent functions from z_ 2 n to z_ m"

Connected through hyperedge HE-4 (induced by source paper "several classes of negabent functions over finite fields"):
  with members:
    - "characterization of negabent functions and construction of bent negabent functions with maximum algebraic degree"

Connected through hyperedge HE-5 (induced by source paper "generalized bent functions and their gray images"):
  with members:
    - "characterization of negabent functions and construction of bent negabent functions with maximum algebraic degree"

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)