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: "opportunistic scheduling and beamforming for mimo sdma downlink systems with linear combining"
  Abstract: Opportunistic scheduling and beamforming schemes are proposed for multiuser MIMO-SDMA downlink systems with linear combining in this work. Signals received from all antennas of each mobile terminal (MT) are linearly combined to improve the effective signal-to-noise-interference ratios (SINRs). By exploiting limited feedback on the effective SINRs, the base station (BS) schedules simultaneous data transmission on multiple beams to the MTs with the largest effective SINRs. Utilizing the extreme value theory, we derive the asymptotic system throughputs and scaling laws for the proposed scheduling and beamforming schemes with different linear combining techniques. Computer simulations confirm that the proposed schemes can substantially improve the system throughput.

Connected through hyperedge HE-1 (induced by source paper "the ergodic capacity of the multiple access channel under distributed scheduling order optimality of linear receivers"):
  with members:
    - "opportunistic scheduling in heterogeneous networks distributed algorithms and system capacity"
    - "on the user selection for mimo broadcast channels"

Connected through hyperedge HE-2 (induced by source paper "asymptotic capacity analysis for adaptive transmission schemes under general fading distributions"):
  with members:
    - "applications of tauberian theorem for high snr analysis of performance over fading channels"
    - "on scaling laws of diversity schemes in decentralized estimation"

Connected through hyperedge HE-3 (induced by source paper "opportunistic scheduling in heterogeneous networks distributed algorithms and system capacity"):
  with members:
    - "min max fair coordinated beamforming in cellular systems via large systems analysis"

Connected through hyperedge HE-4 (induced by source paper "sinr analysis of opportunistic mimo sdma downlink systems with linear combining"):
  with members:
    - "joint power control and user scheduling in multicell wireless networks capacity scaling laws"

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)