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: "on the spatial degrees of freedom of multicell and multiuser mimo channels"
  Abstract: We study the converse and achievability for the degrees of freedom of the multicellular multiple-input multiple-output (MIMO) multiple access channel (MAC) with constant channel coefficients. We assume L>1 homogeneous cells with K>0 users per cell where the users have M antennas and the base stations are equipped with N antennas. The degrees of freedom outer bound for this L-cell and K-user MIMO MAC is formulated. The characterized outer bound uses insight from a limit on the total degrees of freedom for the L-cell heterogeneous MIMO network. We also show through an example that a scheme selecting a transmitter and performing partial message sharing outperforms a multiple distributed transmission strategy in terms of the total degrees of freedom. Simple linear schemes attaining the outer bound (i.e., those achieving the optimal degrees of freedom) are explores for a few cases. The conditions for the required spatial dimensions attaining the optimal degrees of freedom are characterized in terms of K, L, and the number of transmit streams. The optimal degrees of freedom for the two-cell MIMO MAC are examined by using transmit zero forcing and null space interference alignment and subsequently, simple receive zero forcing is shown to provide the optimal degrees of freedom for L>1. By the uplink and downlink duality, the degrees of freedom results in this paper are also applicable to the downlink. In the downlink scenario, we study the degrees of freedom of L-cell MIMO interference channel exploring multiuser diversity. Strong convergence modes of the instantaneous degrees of freedom as the number of users increases are characterized.

Connected through hyperedge HE-1 (induced by source paper "sum rate maximization of multicell miso networks with limited information exchange"):
  with members:
    - "a deep learning framework for optimization of miso downlink beamforming"
    - "opportunistic downlink interference alignment for multi cell mimo networks"
    - "coordinated regularized zero forcing precoding for multicell miso systems with limited feedback"
    - "joint transmission with limited backhaul connectivity"
    - "analysis of massive mimo enabled downlink wireless backhauling for full duplex small cells"
    - "sinr and throughput scaling in ultradense urban cellular networks"
    - "on feasibility of interference alignment in mimo interference networks"
    - "downlink interference alignment"

Connected through hyperedge HE-2 (induced by source paper "degrees of freedom of full duplex multiantenna cellular networks"):
  with members:
    - "degrees of freedom of uplink downlink multiantenna cellular networks"
    - "the feasibility of interference alignment for reverse tdd systems in mimo cellular networks"
    - "degrees of freedom of interference channels with comp transmission and reception"
    - "degrees of freedom region for an interference network with general message demands"
    - "downlink interference alignment"
    - "real interference alignment with real numbers"
    - "ergodic interference alignment"
    - "degrees of freedom of the k user m times n mimo interference channel"

Connected through hyperedge HE-3 (induced by source paper "degrees of freedom of uplink downlink multiantenna cellular networks"):
  with members:
    - "degrees of freedom of full duplex multiantenna cellular networks"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "cellular interference alignment"
    - "genie tree and degrees of freedom of the symmetric mimo interfering broadcast channel"
    - "hetnets and massive mimo modeling potential gains and performance analysis"
    - "on the feasibility of linear interference alignment for mimo interference broadcast channels with constant coefficients"
    - "genie chain and degrees of freedom of symmetric mimo interference broadcast channels"
    - "degrees of freedom of mimo cellular networks decomposition and linear beamforming design"

Connected through hyperedge HE-4 (induced by source paper "the feasibility of interference alignment for reverse tdd systems in mimo cellular networks"):
  with members:
    - "feasibility of interference alignment for the mimo interference channel"
    - "degrees of freedom of uplink downlink multiantenna cellular networks"
    - "cellular interference alignment"
    - "the feasibility conditions for interference alignment in mimo networks"
    - "on the degrees of freedom of asymmetric mimo interference broadcast channels"
    - "hetnets and massive mimo modeling potential gains and performance analysis"
    - "on the feasibility of linear interference alignment for mimo interference broadcast channels with constant coefficients"
    - "regularized zero forcing interference alignment for the two cell mimo interfering broadcast channel"

Connected through hyperedge HE-5 (induced by source paper "degrees of freedom of mimo cellular networks decomposition and linear beamforming design"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "progress on polynomial identity testing ii"
    - "on the feasibility of linear interference alignment for mimo interference broadcast channels with constant coefficients"
    - "genie chain and degrees of freedom of symmetric mimo interference broadcast channels"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "a feasibility test for linear interference alignment in mimo channels with constant coefficients"
    - "degrees of freedom of mimo x networks spatial scale invariance one sided decomposability and linear feasibility"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"

Connected through hyperedge HE-6 (induced by source paper "opportunistic interference alignment for mimo interfering multiple access channels"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "opportunistic interference mitigation achieves optimal degrees of freedom in wireless multi cell uplink networks"
    - "on feasibility of interference alignment in mimo interference networks"
    - "interference alignment under limited feedback for mimo interference channels"
    - "on feasibility of interference alignment in mimo interference networks"
    - "ergodic interference alignment"
    - "degrees of freedom of the k user m times n mimo interference channel"
    - "approaching the capacity of wireless networks through distributed interference alignment"

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)