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: "outage probability of the gaussian mimo free space optical channel with ppm"
  Abstract: The free-space optical channel has the potential to facilitate inexpensive, wireless communication with fiber-like bandwidth under short deployment timelines. However, atmospheric effects can significantly degrade the reliability of a free-space optical link. In particular, atmospheric turbulence causes random fluctuations in the irradiance of the received laser beam, commonly referred to as scintillation. The scintillation process is slow compared to the large data rates typical of optical transmission. As such, we adopt a quasi-static block fading model and study the outage probability of the channel under the assumption of orthogonal pulse-position modulation. We investigate the mitigation of scintillation through the use of multiple lasers and multiple apertures, thereby creating a multiple-input multiple output (MIMO) channel. Non-ideal photodetection is also assumed such that the combined shot noise and thermal noise are considered as signal-independent Additive Gaussian white noise. Assuming perfect receiver channel state information (CSI), we compute the signal-to-noise ratio exponents for the cases when the scintillation is lognormal, exponential and gamma-gamma distributed, which cover a wide range of atmospheric turbulence conditions. Furthermore, we illustrate very large gains, in some cases larger than 15 dB, when transmitter CSI is also available by adapting the transmitted electrical power.

Connected through hyperedge HE-1 (induced by source paper "vlc systems with fixed rate transmissions under statistical queueing constraints"):
  with members:
    - "link selection in hybrid rf vlc systems under statistical queueing constraints"
    - "design of a cognitive vlc network with illumination and handover requirements"
    - "effective capacity in mimo channels with arbitrary inputs"
    - "effective capacity analysis of cognitive radio channels for quality of service provisioning"

Connected through hyperedge HE-2 (induced by source paper "link selection in hybrid rf vlc systems under statistical queueing constraints"):
  with members:
    - "power delay tradeoff with predictive scheduling in integrated cellular and wi fi networks"
    - "effective capacity in cognitive radio broadcast channels"
    - "effective capacity analysis of cognitive radio channels for quality of service provisioning"
    - "on the capacity of free space optical intensity channels"

Connected through hyperedge HE-3 (induced by source paper "optical communication in space challenges and mitigation techniques"):
  with members:
    - "fso based vertical backhaul fronthaul framework for 5g wireless networks"
    - "adaptive subcarrier psk intensity modulation in free space optical systems"
    - "qos provisioning using hybrid fso rf based hierarchical model for wireless multimedia sensor networks"

Connected through hyperedge HE-4 (induced by source paper "on the ergodic capacity of mimo free space optical systems over turbulence channels"):
  with members:
    - "on the distribution of the sum of gamma gamma variates and applications in rf and optical wireless communications"

Connected through hyperedge HE-5 (induced by source paper "causal predictive imperfect channel state information in block fading channels"):
  with members:
    - "mimo arq with multi bit feedback outage analysis"

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)