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: "spatial degrees of freedom of mimo systems in line of sight environment"
  Abstract: While the efficiency of MIMO transmissions in a rich scattering environment has been demonstrated, less is known about the situation where the fading matrix coefficients come from a line-of-sight model. In this paper, we study in detail how this line-of-sight assumption affects the performance of distributed MIMO transmissions between far away clusters of nodes in a wireless network. Our analysis pertains to the study of a new class of random matrices.

Connected through hyperedge HE-1 (induced by source paper "capacity scaling of cellular networks impact of bandwidth infrastructure density and number of antennas"):
  with members:
    - "unified capacity limit of non coherent wideband fading channels"
    - "understanding noise and interference regimes in 5g millimeter wave cellular networks"
    - "spectrum sharing for device to device communication in cellular networks"
    - "demystifying the scaling laws of dense wireless networks no linear scaling in practice"
    - "tractable model for rate in self backhauled millimeter wave cellular networks"
    - "massive mimo for next generation wireless systems"
    - "improving third party relaying for lte a a realistic simulation approach"
    - "scaling laws for infrastructure single and multihop wireless networks in wideband regimes"

Connected through hyperedge HE-2 (induced by source paper "wireless backhaul networks capacity bound scalability analysis and design guidelines"):
  with members:
    - "millimeter wave beamforming for wireless backhaul and access in small cell networks"
    - "joint spatial division and multiplexing for mm wave channels"
    - "improved capacity scaling in wireless networks with infrastructure"
    - "capacity scaling of wireless ad hoc networks shannon meets maxwell"
    - "information theoretic operating regimes of large wireless networks"
    - "hierarchical cooperation achieves optimal capacity scaling in ad hoc networks"

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)