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: "optimal throughput diversity delay tradeoff in mimo arq block fading channels"
  Abstract: In this paper, we consider an automatic-repeat-request (ARQ) retransmission protocol signaling over a block-fading multiple-input-multiple-output (MIMO) channel. Unlike previous work, we allow for multiple fading blocks within each transmission (ARQ round), and we constrain the transmitter to fixed rate codes constructed over complex signal constellations. In particular, we examine the general case of average input-power-constrained con stellations with a fixed signaling alphabet of finite cardinality. This scenario is a suitable model for practical wireless communications systems employing orthogonal frequency division multiplexing (OFDM) techniques over a MIMO ARQ channel. Two cases of fading dynamics are considered, namely, short-term static fading where channel fading gains change randomly for each ARQ round, and long-term static fading where channel fading gains remain constant over all ARQ rounds pertaining to a given message. As our main result, we prove that for the block-fading MIMO ARQ channel with a fixed signaling alphabet satisfying a short-term power constraint, the optimal signal-to-noise ratio (SNR) exponent is given by a modified Singleton bound, relating all the system parameters. To demonstrate the practical significance of the theoretical analysis, we present numerical results showing that practical Singleton-bound-achieving maximum distance separable codes achieve the optimal SNR exponent.

Connected through hyperedge HE-1 (induced by source paper "on the required number of antennas in a point to point large but finite mimo system outage limited scenario"):
  with members:
    - "massive mimo multicasting in noncooperative cellular networks"
    - "on noisy arq in block fading channels"
    - "distributed compressive csit estimation and feedback for fdd multi user massive mimo systems"
    - "massive mimo for next generation wireless systems"
    - "finite block length analysis of the incremental redundancy harq"
    - "downlink training techniques for fdd massive mimo systems open loop and closed loop training with memory"
    - "noncoherent trellis coded quantization a practical limited feedback technique for massive mimo systems"
    - "quasi static multiple antenna fading channels at finite blocklength"

Connected through hyperedge HE-2 (induced by source paper "low complexity frequency domain hybrid arq chase combining for broadband mimo cdma systems"):
  with members:
    - "turbo packet combining for broadband space time bicm hybrid arq systems with co channel interference"
    - "turbo packet combining strategies for the mimo isi arq channel"

Connected through hyperedge HE-3 (induced by source paper "turbo packet combining for broadband space time bicm hybrid arq systems with co channel interference"):
  with members:
    - "turbo packet combining strategies for the mimo isi arq channel"

Connected through hyperedge HE-4 (induced by source paper "hybrid arq in multiple antenna slow fading channels performance limits and optimal linear dispersion code design"):
  with members:
    - "performance of hybrid arq in block fading channels a fixed outage probability analysis"
    - "on fast decodable space time block codes"
    - "capacity definitions of general channels with receiver side information"

Connected through hyperedge HE-5 (induced by source paper "turbo packet combining strategies for the mimo isi arq channel"):
  with members:
    - "diversity multiplexing tradeoff in selective fading mimo channels"

Connected through hyperedge HE-6 (induced by source paper "performance of hybrid arq in block fading channels a fixed outage probability analysis"):
  with members:
    - "coding versus arq in fading channels how reliable should the phy be"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "on the mutual information distribution of ofdm based spatial multiplexing exact variance and outage approximation"

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)