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: "on the achievable diversity multiplexing tradeoffs in half duplex cooperative channels"
  Abstract: In this paper, we propose novel cooperative transmission protocols for delay limited coherent fading channels consisting of N (half-duplex and single-antenna) partners and one cell site. In our work, we differentiate between the relay, cooperative broadcast (down-link), and cooperative multiple-access (up-link) channels. For the relay channel, we investigate two classes of cooperation schemes; namely, Amplify and Forward (AF) protocols and Decode and Forward (DF) protocols. For the first class, we establish an upper bound on the achievable diversity-multiplexing tradeoff with a single relay. We then construct a new AF protocol that achieves this upper bound. The proposed algorithm is then extended to the general case with N-1 relays where it is shown to outperform the space-time coded protocol of Laneman and Worenell without requiring decoding/encoding at the relays. For the class of DF protocols, we develop a dynamic decode and forward (DDF) protocol that achieves the optimal tradeoff for multiplexing gains 0 < r < 1/N. Furthermore, with a single relay, the DDF protocol is shown to dominate the class of AF protocols for all multiplexing gains. The superiority of the DDF protocol is shown to be more significant in the cooperative broadcast channel. The situation is reversed in the cooperative multiple-access channel where we propose a new AF protocol that achieves the optimal tradeoff for all multiplexing gains. A distinguishing feature of the proposed protocols in the three scenarios is that they do not rely on orthogonal subspaces, allowing for a more efficient use of resources. In fact, using our results one can argue that the sub-optimality of previously proposed protocols stems from their use of orthogonal subspaces rather than the half-duplex constraint.

Connected through hyperedge HE-1 (induced by source paper "algebraic fast decodable relay codes for distributed communications"):
  with members:
    - "quadratic forms and space time block codes from generalized quaternion and biquaternion algebras"
    - "fast group decodable stbcs via codes over gf 4"
    - "multi group ml decodable collocated and distributed space time block codes"
    - "on fast decodable space time block codes"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-2 (induced by source paper "using distributed rotations for a low complexity dynamic decode and forward relay protocol"):
  with members:
    - "coding and decoding for the dynamic decode and forward relay protocol"

Connected through hyperedge HE-3 (induced by source paper "the diversity multiplexing tradeoff of the symmetric mimo half duplex relay channel"):
  with members:
    - "the diversity multiplexing tradeoff of the dynamic decode and forward protocol on a mimo half duplex relay channel"
    - "diversity multiplexing tradeoff for the mimo static half duplex relay"
    - "diversity multiplexing tradeoff of the half duplex relay channel"

Connected through hyperedge HE-4 (induced by source paper "multiplexing gain of amplify forward relaying in wireless multi antenna relay networks"):
  with members:
    - "wireless network information flow a deterministic approach"
    - "multi hop cooperative wireless networks diversity multiplexing tradeoff and optimal code design"
    - "dmt of multi hop cooperative networks part i basic results"
    - "on the diversity multiplexing tradeoff in multiple relay network"
    - "approximate capacity of gaussian relay networks"
    - "asymptotic analysis of amplify and forward relaying in a parallel mimo relay network"
    - "wireless network information flow"
    - "towards the optimal amplify and forward cooperative diversity scheme"

Connected through hyperedge HE-5 (induced by source paper "cooperative strategies for the half duplex gaussian parallel relay channel simultaneous relaying versus successive relaying"):
  with members:
    - "recovering multiplexing loss through successive relaying using repetition coding"
    - "parity forwarding for multiple relay networks"
    - "towards the optimal amplify and forward cooperative diversity scheme"

Connected through hyperedge HE-6 (induced by source paper "diversity multiplexing tradeoffs in mimo relay channels"):
  with members:
    - "on the diversity multiplexing tradeoff in multiple relay network"
    - "diversity of mimo multihop relay channels"
    - "d mg tradeoff and optimal codes for a class of af and df cooperative communication protocols"

Connected through hyperedge HE-7 (induced by source paper "diversity multiplexing tradeoff for the mimo static half duplex relay"):
  with members:
    - "diversity multiplexing tradeoff of the half duplex relay channel"
    - "a simple cooperative diversity method based on network path selection"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-8 (induced by source paper "distributed space time codes for the amplify and forward multiple access relay channel"):
  with members:
    - "distributed space time block codes for the mimo multiple access channel"
    - "a case for amplify forward relaying in the block fading multi access channel"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

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)