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: "towards the optimal amplify and forward cooperative diversity scheme"
  Abstract: In a slow fading channel, how to find a cooperative diversity scheme that achieves the transmit diversity bound is still an open problem. In fact, all previously proposed amplify-and-forward (AF) and decode-and-forward (DF) schemes do not improve with the number of relays in terms of the diversity multiplexing tradeoff (DMT) for multiplexing gains r higher than 0.5. In this work, we study the class of slotted amplify-and-forward (SAF) schemes. We first establish an upper bound on the DMT for any SAF scheme with an arbitrary number of relays N and number of slots M. Then, we propose a sequential SAF scheme that can exploit the potential diversity gain in the high multiplexing gain regime. More precisely, in certain conditions, the sequential SAF scheme achieves the proposed DMT upper bound which tends to the transmit diversity bound when M goes to infinity. In particular, for the two-relay case, the three-slot sequential SAF scheme achieves the proposed upper bound and outperforms the two-relay non-orthorgonal amplify-and-forward (NAF) scheme of Azarian et al. for multiplexing gains r < 2/3. Numerical results reveal a significant gain of our scheme over the previously proposed AF schemes, especially in high spectral efficiency and large network size regime.

Connected through hyperedge HE-1 (induced by source paper "relay pair selection in buffer aided successive opportunistic relaying using a multi antenna source"):
  with members:
    - "decoupled uplink and downlink in a wireless system with buffer aided relaying"
    - "virtual full duplex buffer aided relaying in the presence of inter relay interference"
    - "a buffer aided successive opportunistic relay selection scheme with power adaptation and inter relay interference cancellation for cooperative diversity systems"
    - "selective cooperative relaying over time varying channels"
    - "superposition coded concurrent decode and forward relaying"
    - "recovering multiplexing loss through successive relaying using repetition coding"
    - "a simple cooperative diversity method based on network path selection"

Connected through hyperedge HE-2 (induced by source paper "relay pair selection with source precoding in buffer aided successive opportunistic relaying"):
  with members:
    - "decoupled uplink and downlink in a wireless system with buffer aided relaying"
    - "virtual full duplex buffer aided relaying in the presence of inter relay interference"
    - "a buffer aided successive opportunistic relay selection scheme with power adaptation and inter relay interference cancellation for cooperative diversity systems"
    - "selective cooperative relaying over time varying channels"
    - "superposition coded concurrent decode and forward relaying"
    - "recovering multiplexing loss through successive relaying using repetition coding"
    - "a simple cooperative diversity method based on network path selection"

Connected through hyperedge HE-3 (induced by source paper "diversity of linear transceivers in mimo af half duplex relaying channels"):
  with members:
    - "diversity of mmse mimo receivers"
    - "asymptotic performance of linear receivers in mimo fading channels"
    - "diversity multiplexing tradeoff for the mimo static half duplex relay"
    - "diversity multiplexing tradeoff of double scattering mimo channels"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-4 (induced by source paper "iterative network channel decoding with cooperative space time transmission"):
  with members:
    - "iterative soft input soft output decoding of reed solomon codes by adapting the parity check matrix"

Connected through hyperedge HE-5 (induced by source paper "error performance and diversity analysis of multi source multi relay wireless networks with binary network coding and cooperative mrc"):
  with members:
    - "diversity coding and multiplexing trade off of network coded cooperative wireless networks"
    - "wireless network code design and performance analysis using diversity multiplexing tradeoff"
    - "recovering multiplexing loss through successive relaying using repetition coding"

Connected through hyperedge HE-6 (induced by source paper "lower bound on the ber of a decode and forward relay network under chaos shift keying communication system"):
  with members:
    - "design and analysis of a multi carrier differential chaos shift keying communication system"
    - "lattice codes for the gaussian relay channel decode and forward and compress and forward"

Connected through hyperedge HE-7 (induced by source paper "on the proximity factors of lattice reduction aided decoding"):
  with members:
    - "lr aided mmse lattice decoding is dmt optimal for all approximately universal codes"
    - "lll reduction achieves the receive diversity in mimo decoding"
    - "on the limitations of the naive lattice decoding"

Connected through hyperedge HE-8 (induced by source paper "dmt optimality of lr aided linear decoders for a general class of channels lattice designs and system models"):
  with members:
    - "finite lattice size effects in mimo detection"
    - "algebraic reduction for space time codes based on quaternion algebras"
    - "on the densest mimo lattices from cyclic division algebras"
    - "on fast decodable space time block codes"
    - "lll reduction achieves the receive diversity in mimo decoding"
    - "diversity multiplexing tradeoff in selective fading mimo channels"
    - "approximately universal space time codes for the parallel multi block and cooperative dynamic decode and forward channels"
    - "on the limitations of the naive lattice decoding"

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)