human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "spatial characterization of holographic mimo channels"):
  Abstract: Imagine beings surrounded by continuous apertures that can emit and receive electromagnetic waves. A system of this sort, having an uncountably infinite number of antennas in a compact space, is called Holographic MIMO. Given the solid results for Massive MIMO, one might expect a holographic system to realize extreme spatial resolution, incredible energy efficiency, and unprecedented spectral efficiency. At present, however, the fundamental advantages of continuous apertures over conventional discrete spaced antenna arrays have not been conclusively established. A major challenge for the analysis and understanding of such a paradigm shift is the lack of mathematically tractable and numerically reproducible spatially-continuous channel models that retain some semblance of the physical reality. Physical models are too complex for tractable analysis. This paper aims to take a closer look at this challenge through the conventional tools of linear systems theory and Fourier transform. Notably, this leads to a rather simple Fourier plane-wave spectral representation of a three-dimensional spatially-continuous channel from which a computationally efficient way to generate samples over compact continuous apertures can be developed.

Includes members:
  Member "degrees of freedom of holographic mimo channels":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "spatially stationary model for holographic mimo small scale fading")
  Member "large system analysis of massive mimo with optimal m mmse processing":
    also connected through other hyperedges:
      (none)
  Member "beyond massive mimo the potential of data transmission with large intelligent surfaces":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "overhead aware design of reconfigurable intelligent surfaces in smart radio environments")
  Member "massive mimo has unlimited capacity":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "joint power control and lsfd for wireless powered cell free massive mimo")
  Member "optimal pilot and payload power control in single cell massive mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "power control in cellular massive mimo with varying user activity a deep learning solution")
  Member "space constrained massive mimo hitting the wall of favorable propagation":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "spectral efficiency of one bit sigma delta massive mimo")
  Member "a generalized spatial correlation model for 3d mimo channels based on the fourier coefficients of power spectrums":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "asymptotic max min sinr analysis of reconfigurable intelligent surface assisted miso systems")
  Member "on landau s eigenvalue theorem and information cut sets":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "spatially stationary model for holographic mimo small scale fading")

Question: Please tell me which class the source paper 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)