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: "pareto characterization of the multicell mimo performance region with simple receivers"
  Abstract: We study the performance region of a general multicell downlink scenario with multiantenna transmitters, hardware impairments, and low-complexity receivers that treat interference as noise. The Pareto boundary of this region describes all efficient resource allocations, but is generally hard to compute. We propose a novel explicit characterization that gives Pareto optimal transmit strategies using a set of positive parameters-fewer than in prior work. We also propose an implicit characterization that requires even fewer parameters and guarantees to find the Pareto boundary for every choice of parameters, but at the expense of solving quasi-convex optimization problems. The merits of the two characterizations are illustrated for interference channels and ideal network multiple-input multiple-output (MIMO).

Connected through hyperedge HE-1 (induced by source paper "linear transceiver optimization in multicell mimo based on the generalized benders decomposition"):
  with members:
    - "on the pareto optimal beam structure and design for multi user mimo interference channels"
    - "the mimo iterative waterfilling algorithm"

Connected through hyperedge HE-2 (induced by source paper "multicell coordinated beamforming with rate outage constraint part i complexity analysis"):
  with members:
    - "signal processing and optimal resource allocation for the interference channel"
    - "multicell coordinated beamforming with rate outage constraint part ii efficient approximation algorithms"
    - "coordinated beamforming for multiuser miso interference channel under rate outage constraints"
    - "achievable outage rate regions for the miso interference channel"
    - "outage probability and outage based robust beamforming for mimo interference channels with imperfect channel state information"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "optimality properties distributed strategies and measurement based evaluation of coordinated multicell ofdma transmission"
    - "optimal beamforming in interference networks with perfect local channel information"

Connected through hyperedge HE-3 (induced by source paper "linear precoding based on polynomial expansion large scale multi cell mimo systems"):
  with members:
    - "massive mimo systems with non ideal hardware energy efficiency estimation and capacity limits"
    - "linear precoding based on polynomial expansion reducing complexity in massive mimo"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "joint spatial division and multiplexing"
    - "large system analysis of linear precoding in correlated miso broadcast channels under limited feedback"
    - "asymptotic moments for interference mitigation in correlated fading channels"
    - "pilot contamination and precoding in multi cell tdd systems"
    - "a central limit theorem for the sinr at the lmmse estimator output for large dimensional signals"

Connected through hyperedge HE-4 (induced by source paper "interference aware rzf precoding for multi cell downlink systems"):
  with members:
    - "massive mimo systems with non ideal hardware energy efficiency estimation and capacity limits"
    - "downlink training techniques for fdd massive mimo systems open loop and closed loop training with memory"
    - "massive mimo for maximal spectral efficiency how many users and pilots should be allocated"
    - "mimo interference alignment over correlated channels with imperfect csi"
    - "on the accuracy of the wyner model in cellular networks"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-5 (induced by source paper "optimized transmission with improper gaussian signaling in the k user miso interference channel"):
  with members:
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "robust monotonic optimization framework for multicell miso systems"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "optimal beamforming in interference networks with perfect local channel information"
    - "rate region frontiers for n user interference channel with interference as noise"
    - "balancing egoism and altruism on the interference channel the mimo case"
    - "cooperative interference management with miso beamforming"
    - "linear transceiver design for interference alignment complexity and computation"

Connected through hyperedge HE-6 (induced by source paper "alternating rate profile optimization in single stream mimo interference channels"):
  with members:
    - "on the pareto optimal beam structure and design for multi user mimo interference channels"
    - "pareto boundary of the rate region for single stream mimo interference channels linear transceiver design"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "linear transceiver design for a mimo interfering broadcast channel achieving max min fairness"
    - "cooperative algorithms for mimo interference channels"
    - "optimal distributed beamforming for miso interference channels"
    - "balancing egoism and altruism on the interference channel the mimo case"
    - "cooperative interference management with miso beamforming"

Connected through hyperedge HE-7 (induced by source paper "pareto boundary of the rate region for single stream mimo interference channels linear transceiver design"):
  with members:
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "optimal beamforming in interference networks with perfect local channel information"
    - "cooperative algorithms for mimo interference channels"
    - "optimal distributed beamforming for miso interference channels"
    - "balancing egoism and altruism on the interference channel the mimo case"
    - "cooperative interference management with miso beamforming"
    - "optimal spectrum sharing in mimo cognitive radio networks via semidefinite programming"
    - "competitive design of multiuser mimo systems based on game theory a unified view"

Connected through hyperedge HE-8 (induced by source paper "on the pareto optimal beam structure and design for multi user mimo interference channels"):
  with members:
    - "alternating rate profile optimization in single stream mimo interference channels"
    - "coordinated beamforming with relaxed zero forcing the sequential orthogonal projection combining method and rate control"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "pareto boundary of the rate region for single stream mimo interference channels linear transceiver design"
    - "optimal beamforming in interference networks with perfect local channel information"
    - "cooperative interference management with miso beamforming"

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)