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: "golden space time trellis coded modulation"
  Abstract: In this paper, we present a concatenated coding scheme for a high rate $2\times 2$ multiple-input multiple-output (MIMO) system over slow fading channels. The inner code is the Golden code \cite{Golden05} and the outer code is a trellis code. Set partitioning of the Golden code is designed specifically to increase the minimum determinant. The branches of the outer trellis code are labeled with these partitions. Viterbi algorithm is applied for trellis decoding. In order to compute the branch metrics a lattice sphere decoder is used. The general framework for code optimization is given. The performance of the proposed concatenated scheme is evaluated by simulation. It is shown that the proposed scheme achieves significant performance gains over uncoded Golden code.

Connected through hyperedge HE-1 (induced by source paper "golden coded index coding"):
  with members:
    - "wireless caching technical misconceptions and business barriers"
    - "index codes for the gaussian broadcast channel using quadrature amplitude modulation"
    - "lattice index coding"
    - "fundamental limits of caching in wireless d2d networks"
    - "fundamental limits of caching"

Connected through hyperedge HE-2 (induced by source paper "lattice codes for the gaussian wiretap channel"):
  with members:
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "secrecy achieving polar coding for binary input memoryless symmetric wire tap channels"
    - "unimodular lattices for the gaussian wiretap channel"
    - "secrecy gain a wiretap lattice code design"
    - "providing secrecy with structured codes tools and applications to two user gaussian channels"
    - "on wiretap networks ii"
    - "applications of ldpc codes to the wiretap channel"

Connected through hyperedge HE-3 (induced by source paper "codes over matrix rings for space time coded modulations"):
  with members:
    - "on the densest mimo lattices from cyclic division algebras"

Connected through hyperedge HE-4 (induced by source paper "space time codes from structured lattices"):
  with members:
    - "approximately universal codes over slow fading channels"
    - "perfect space time codes with minimum and non minimum delay for any number of antennas"

Connected through hyperedge HE-5 (induced by source paper "golden space time block coded modulation"):
  with members:
    - "maximal orders in the design of dense space time lattice codes"

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)