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: "space time coding techniques with bit interleaved coded modulations for mimo block fading channels"
  Abstract: The space-time bit-interleaved coded modulation (ST-BICM) is an efficient technique to obtain high diversity and coding gain on a block-fading multiple-input multiple-output (MIMO) channel. Its maximum-likelihood (ML) performance is computed under ideal interleaving conditions, which enables a global optimization taking into account channel coding. Thanks to a diversity upper bound derived from the Singleton bound, an appropriate choice of the time dimension of the space-time coding is possible, which maximizes diversity while minimizing complexity. Based on the analysis, an optimized interleaver and a set of linear precoders, called dispersive nucleo algebraic (DNA) precoders are proposed. The proposed precoders have good performance with respect to the state of the art and exist for any number of transmit antennas and any time dimension. With turbo codes, they exhibit a frame error rate which does not increase with frame length.

Connected through hyperedge HE-1 (induced by source paper "space time signal design for multilevel polar coding in slow fading broadcast channels"):
  with members:
    - "throughput based design for polar coded modulation"
    - "list decoding of polar codes"
    - "aspects of polar coded modulation"
    - "precoding for outage probability minimization on block fading channels"
    - "channel polarization a method for constructing capacity achieving codes for symmetric binary input memoryless channels"
    - "approximately universal codes over slow fading channels"
    - "channel combining and splitting for cutoff rate improvement"

Connected through hyperedge HE-2 (induced by source paper "time varying space only codes for coded mimo"):
  with members:
    - "sphere decoding complexity exponent for decoding full rate codes over the quasi static mimo channel"
    - "precoding for outage probability minimization on block fading channels"
    - "a tight lower bound to the outage probability of discrete input block fading channels"
    - "approximately universal codes over slow fading channels"

Connected through hyperedge HE-3 (induced by source paper "precoding for outage probability minimization on block fading channels"):
  with members:
    - "high snr asymptotics of mutual information for discrete constellations with applications to bicm"
    - "low density graph codes for coded cooperation on slow fading relay channels"
    - "precoding by pairing subchannels to increase mimo capacity with discrete input alphabets"
    - "mimo precoding with x and y codes"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-4 (induced by source paper "coding for the non orthogonal amplify and forward cooperative channel"):
  with members:
    - "towards the optimal amplify and forward cooperative diversity scheme"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"
    - "on the achievable diversity multiplexing tradeoffs in half duplex cooperative 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)