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: "nonlinear precoders for massive mimo systems with general constraints"
  Abstract: We introduce a class of nonlinear least square error precoders with a general penalty function for multiuser massive MIMO systems. The generality of the penalty function allows us to consider several hardware limitations including transmitters with a predefined constellation and restricted number of active antennas. The large-system performance is then investigated via the replica method under the assumption of replica symmetry. It is shown that the least square precoders exhibit the "marginal decoupling property" meaning that the marginal distributions of all precoded symbols converge to a deterministic distribution. As a result, the asymptotic performance of the precoders is described by an equivalent single-user system. To address some applications of the results, we further study the asymptotic performance of the precoders when both the peak-to-average power ratio and number of active transmit antennas are constrained. Our numerical investigations show that for a desired distortion at the receiver side, proposed forms of the least square precoders need to employ around %35\%$ fewer number of active antennas compared to cases with random transmit antenna selection.

Connected through hyperedge HE-1 (induced by source paper "secure regularized zero forcing for multiuser mimome channels"):
  with members:
    - "on robustness of massive mimo systems against passive eavesdropping under antenna selection"
    - "glse precoders for massive mimo systems analysis and applications"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "applications of large random matrices in communications engineering"
    - "linear precoding for broadcast channels with confidential messages under transmit side channel correlation"
    - "large system analysis of linear precoding in miso broadcast channels with confidential messages"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"

Connected through hyperedge HE-2 (induced by source paper "joint user selection and precoding in multiuser mimo systems via group lasso"):
  with members:
    - "secure regularized zero forcing for multiuser mimome channels"
    - "precoding via approximate message passing with instantaneous signal constraints"
    - "on robustness of massive mimo systems against passive eavesdropping under antenna selection"
    - "glse precoders for massive mimo systems analysis and applications"
    - "theoretical bounds on map estimation in distributed sensing networks"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "generalized approximate message passing for estimation with random linear mixing"
    - "consistency of the group lasso and multiple kernel learning"

Connected through hyperedge HE-3 (induced by source paper "papr limited precoding in massive mimo systems with reflect and transmit array antennas"):
  with members:
    - "precoding via approximate message passing with instantaneous signal constraints"
    - "glse precoders for massive mimo systems analysis and applications"
    - "scalable and energy efficient millimeter massive mimo architectures reflect array and transmit array antennas"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "hybrid beamforming for massive mimo a survey"
    - "spatially sparse precoding in millimeter wave mimo systems"

Connected through hyperedge HE-4 (induced by source paper "glse precoders for massive mimo systems analysis and applications"):
  with members:
    - "stepwise transmit antenna selection in downlink massive multiuser mimo"
    - "the stochastic interpolation method a simple scheme to prove replica formulas in bayesian inference"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "asymptotics of transmit antenna selection impact of multiple receive antennas"
    - "energy efficient coordinated multi cell multi group multicast beamforming with antenna selection"
    - "a new class of nonlinear precoders for hardware efficient massive mimo systems"
    - "the replica symmetric prediction for compressed sensing with gaussian matrices is exact"
    - "rsb decoupling property of map estimators"

Connected through hyperedge HE-5 (induced by source paper "iterative antenna selection for secrecy enhancement in massive mimo wiretap channels"):
  with members:
    - "stepwise transmit antenna selection in downlink massive multiuser mimo"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "asymptotics of transmit antenna selection impact of multiple receive antennas"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "low complexity hybrid precoding in massive multiuser mimo systems"
    - "the secrecy capacity of the mimo wiretap channel"
    - "multiuser mimo achievable rates with downlink training and channel state feedback"

Connected through hyperedge HE-6 (induced by source paper "precoding via approximate message passing with instantaneous signal constraints"):
  with members:
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "asymptotics of transmit antenna selection impact of multiple receive antennas"
    - "fixed points of generalized approximate message passing with arbitrary matrices"
    - "per antenna constant envelope precoding for large multi user mimo systems"
    - "generalized approximate message passing for estimation with random linear mixing"
    - "message passing algorithms for compressed sensing"

Connected through hyperedge HE-7 (induced by source paper "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"):
  with members:
    - "rsb decoupling property of map estimators"
    - "lse precoders for massive mimo with hardware constraints fundamental limits"
    - "per antenna constant envelope precoding for large multi user mimo systems"
    - "asymptotic analysis of map estimation via the replica method and applications to compressed sensing"
    - "randomly spread cdma asymptotics via statistical physics"

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)