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: "approximately universal optimality over several dynamic and non dynamic cooperative diversity schemes for wireless networks"
  Abstract: In this work we explicitly provide the first ever optimal, with respect to the Zheng-Tse diversity multiplexing gain (D-MG) tradeoff, cooperative diversity schemes for wireless relay networks. The schemes are based on variants of perfect space-time codes and are optimal for any number of users and all statistically symmetric (and in some cases, asymmetric) fading distributions. #R##N#We deduce that, with respect to the D-MG tradeoff, channel knowledge at the intermediate relays and infinite delay are unnecessary. We also show that the non-dynamic selection decode and forward strategy, the non-dynamic amplify and forward, the non-dynamic receive and forward, the dynamic amplify and forward and the dynamic receive and forward cooperative diversity strategies allow for exactly the same D-MG optimal performance.

Connected through hyperedge HE-1 (induced by source paper "wireless coded caching a topological perspective"):
  with members:
    - "information theoretic caching the multi user case"
    - "noisy broadcast networks with receiver caching"
    - "fundamental limits of cache aided interference management"
    - "complete interference mitigation through receiver caching in wyner s networks"
    - "multi library coded caching"
    - "effect of number of users in multi level coded caching"
    - "cache enabled broadcast packet erasure channels with state feedback"
    - "cache aided interference channels"

Connected through hyperedge HE-2 (induced by source paper "performance complexity analysis for mac ml based decoding with user selection"):
  with members:
    - "achieving a vanishing snr gap to exact lattice decoding at a subexponential complexity"
    - "sphere decoding complexity exponent for decoding full rate codes over the quasi static mimo channel"
    - "minimizing the complexity of fast sphere decoding of stbcs"
    - "dmt optimality of lr aided linear decoders for a general class of channels lattice designs and system models"
    - "lr aided mmse lattice decoding is dmt optimal for all approximately universal codes"

Connected through hyperedge HE-3 (induced by source paper "on the capacity and diversity multiplexing tradeoff of the two way relay channel"):
  with members:
    - "approximate capacity of the two way relay channel a deterministic approach"
    - "optimal beamforming for two way multi antenna relay channel with analogue network coding"
    - "joint physical layer coding and network coding for bi directional relaying"
    - "the capacity of two way relay channel"
    - "achievable rate regions for bi directional relaying"
    - "physical network coding in two way wireless relay channels"
    - "performance bounds for bi directional coded cooperation protocols"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-4 (induced by source paper "cascaded orthogonal space time block codes for wireless multi hop relay networks"):
  with members:
    - "multi hop cooperative wireless networks diversity multiplexing tradeoff and optimal code design"
    - "dmt of multi hop cooperative networks part ii half duplex networks with full duplex performance"
    - "algebraic distributed space time codes with low ml decoding complexity"
    - "diversity of mimo multihop relay channels"
    - "a non orthogonal distributed space time coded protocol part i signal model and design criteria"
    - "a non orthogonal distributed space time coded protocol part ii code construction and dm g tradeoff"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-5 (induced by source paper "diversity of mimo multihop relay channels"):
  with members:
    - "hierarchical cooperation achieves optimal capacity scaling in ad hoc networks"
    - "towards the optimal amplify and forward cooperative diversity scheme"
    - "diversity multiplexing tradeoff of double scattering mimo channels"
    - "capacity and character expansions moment generating function and other exact results for mimo correlated channels"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"
    - "approximately universal codes over slow fading channels"

Connected through hyperedge HE-6 (induced by source paper "diversity of mimo multihop relay channels part i amplify and forward"):
  with members:
    - "diversity multiplexing tradeoff of double scattering mimo channels"
    - "capacity and character expansions moment generating function and other exact results for mimo correlated channels"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"
    - "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-7 (induced by source paper "the impact of noise correlation and channel phase information on the data rate of the single symbol ml decodable distributed stbcs"):
  with members:
    - "distributed space time codes for cooperative networks with partial csi"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-8 (induced by source paper "towards the optimal amplify and forward cooperative diversity scheme"):
  with members:
    - "a simple cooperative diversity method based on network path selection"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"
    - "approximately universal codes over slow fading channels"
    - "perfect space time codes with minimum and non minimum delay for any number of antennas"

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)