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: "linear precoding for the mimo multiple access channel with finite alphabet inputs and statistical csi"
  Abstract: In this paper, we investigate the design of linear precoders for the multiple-input–multiple-output (MIMO) multiple access channel (MAC). We assume that statistical channel state information (CSI) is available at the transmitters and consider the problem under the practical finite alphabet input assumption. First, we derive an asymptotic (in the large system limit) expression for the weighted sum rate (WSR) of the MIMO MAC with finite alphabet inputs and Weichselberger's MIMO channel model. Subsequently, we obtain the optimal structures of the linear precoders of the users maximizing the asymptotic WSR and an iterative algorithm for determining the precoders. We show that the complexity of the proposed precoder design is significantly lower than that of MIMO MAC precoders designed for finite alphabet inputs and instantaneous CSI. Simulation results for finite alphabet signaling indicate that the proposed precoder achieves significant performance gains over existing precoder designs.

Connected through hyperedge HE-1 (induced by source paper "millimeter wave massive mimo downlink per group communications with hybrid linear precoding"):
  with members:
    - "accurately accounting for random blockage in device to device mmwave networks"
    - "downlink precoding for massive mimo systems exploiting virtual channel model sparsity"
    - "device to device millimeter wave communications interference coverage rate and finite topologies"
    - "joint spatial division and multiplexing for mm wave channels"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-2 (induced by source paper "channel statistics based hybrid precoding for millimeter wave mimo systems with dynamic subarrays"):
  with members:
    - "secure transmission with large numbers of antennas and finite alphabet inputs"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"
    - "dynamic subarrays for hybrid precoding in wideband mmwave mimo systems"
    - "spatially sparse precoding in millimeter wave mimo systems"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-3 (induced by source paper "secure transmission with large numbers of antennas and finite alphabet inputs"):
  with members:
    - "physical layer security for spectrum sharing systems"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "secure massive mimo transmission with an active eavesdropper"
    - "large scale mimo relaying techniques for physical layer security af or df"
    - "multi antenna relay aided wireless physical layer security"
    - "low complexity mimo precoding with discrete signals and statistical csi"
    - "dealing with interference in distributed large scale mimo systems a statistical approach"

Connected through hyperedge HE-4 (induced by source paper "uplink non orthogonal multiple access with finite alphabet inputs"):
  with members:
    - "on non orthogonal multiple access with finite alphabet inputs in z channels"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "capacity comparison between mimo noma and mimo oma with multiple users in a cluster"
    - "joint rate control and power allocation for non orthogonal multiple access systems"
    - "nonorthogonal multiple access in large scale underlay cognitive radio networks"
    - "relay selection for cooperative noma"
    - "quadrature amplitude modulation division for multiuser miso broadcast channels"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"

Connected through hyperedge HE-5 (induced by source paper "on non orthogonal multiple access with finite alphabet inputs in z channels"):
  with members:
    - "nonorthogonal multiple access in large scale underlay cognitive radio networks"
    - "relay selection for cooperative noma"
    - "a survey of downlink non orthogonal multiple access for 5g wireless communication networks"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"
    - "on the gaussian many to one x channel"
    - "cooperative non orthogonal multiple access with simultaneous wireless information and power transfer"
    - "what will 5g be"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"

Connected through hyperedge HE-6 (induced by source paper "downlink precoding for massive mimo systems exploiting virtual channel model sparsity"):
  with members:
    - "spatial temporal bem and channel estimation strategy for massive mimo time varying systems"
    - "low complexity mimo precoding with discrete signals and statistical csi"
    - "kronecker product correlation model and limited feedback codebook design in a 3d channel model"
    - "large system analysis of correlated mimo multiple access channels with arbitrary signaling in the presence of interference"
    - "joint spatial division and multiplexing for mm wave channels"
    - "a coordinated approach to channel estimation in large scale multiple antenna systems"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-7 (induced by source paper "effective capacity in mimo channels with arbitrary inputs"):
  with members:
    - "the world s first real time testbed for massive mimo design implementation and validation"
    - "backlog and delay reasoning in harq systems"
    - "massive mimo systems with non ideal hardware energy efficiency estimation and capacity limits"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"
    - "linear mimo precoding in jointly correlated fading multiple access channels with finite alphabet signaling"
    - "on the impact of hardware impairments on massive mimo"
    - "on the throughput and energy efficiency of cognitive mimo transmissions"

Connected through hyperedge HE-8 (induced by source paper "linear precoding for mimo channels with qam constellations and reduced complexity"):
  with members:
    - "low complexity mimo precoding with discrete signals and statistical csi"
    - "diversity analysis of bit interleaved coded multiple beamforming with orthogonal frequency division multiplexing"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "on optimal precoding in linear vector gaussian channels with arbitrary input distribution"
    - "constellation precoded multiple beamforming"
    - "pilot contamination and precoding in multi cell tdd systems"

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)