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: "degrees of freedom of uplink downlink multiantenna cellular networks"
  Abstract: An uplink-downlink two-cell cellular network is studied in which the first base station (BS) with $M_1$ antennas receives independent messages from its $N_1$ serving users, while the second BS with $M_2$ antennas transmits independent messages to its $N_2$ serving users. That is, the first and second cells operate as uplink and downlink, respectively. Each user is assumed to have a single antenna. Under this uplink-downlink setting, the sum degrees of freedom (DoF) is completely characterized as the minimum of $(N_1N_2+\min(M_1,N_1)(N_1-N_2)^++\min(M_2,N_2)(N_2-N_1)^+)/\max(N_1,N_2)$, $M_1+N_2,M_2+N_1$, $\max(M_1,M_2)$, and $\max(N_1,N_2)$, where $a^+$ denotes $\max(0,a)$. The result demonstrates that, for a broad class of network configurations, operating one of the two cells as uplink and the other cell as downlink can strictly improve the sum DoF compared to the conventional uplink or downlink operation, in which both cells operate as either uplink or downlink. The DoF gain from such uplink-downlink operation is further shown to be achievable for heterogeneous cellular networks having hotspots and with delayed channel state information.

Connected through hyperedge HE-1 (induced by source paper "linear degrees of freedom of mimo broadcast channels with reconfigurable antennas in the absence of csit"):
  with members:
    - "fundamental limits of spectrum sharing full duplex multicell networks"
    - "degrees of freedom of full duplex cellular networks with reconfigurable antennas at base station"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "linear degrees of freedom of the mimo x channel with delayed csit"
    - "diophantine approach to blind interference alignment of homogeneous k user 2x1 miso broadcast channels"
    - "a new outer bound via interference localization and the degrees of freedom regions of mimo interference networks with no csit"
    - "completely stale transmitter channel state information is still very useful"

Connected through hyperedge HE-2 (induced by source paper "degrees of freedom of full duplex cellular networks with reconfigurable antennas at base station"):
  with members:
    - "linear degrees of freedom of mimo broadcast channels with reconfigurable antennas in the absence of csit"
    - "prototyping real time full duplex radios"
    - "degrees of freedom of full duplex multiantenna cellular networks"
    - "the feasibility of interference alignment for reverse tdd systems in mimo cellular networks"
    - "in band full duplex wireless challenges and opportunities"
    - "diophantine approach to blind interference alignment of homogeneous k user 2x1 miso broadcast channels"
    - "experiment driven characterization of full duplex wireless systems"
    - "downlink interference alignment"

Connected through hyperedge HE-3 (induced by source paper "fundamental limits of spectrum sharing full duplex multicell networks"):
  with members:
    - "on the degrees of freedom of full duplex cellular networks"
    - "degrees of freedom of full duplex multiantenna cellular networks"
    - "degrees of freedom of mimo cellular networks decomposition and linear beamforming design"
    - "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"
    - "ergodic interference alignment"
    - "degrees of freedom of the k user m times n mimo interference channel"

Connected through hyperedge HE-4 (induced by source paper "cell associations that maximize the average uplink downlink degrees of freedom"):
  with members:
    - "layered downlink precoding for c ran systems with full dimensional mimo"
    - "conferencing in wyner s asymmetric interference network effect of number of rounds"
    - "performance of cloud radio networks"
    - "on uplink downlink duality for cellular ia"
    - "cellular interference alignment"
    - "dynamic interference management"
    - "degrees of freedom of interference channels with comp transmission and reception"

Connected through hyperedge HE-5 (induced by source paper "degrees of freedom of full duplex multiantenna cellular networks"):
  with members:
    - "the feasibility of interference alignment for reverse tdd systems in mimo cellular networks"
    - "degrees of freedom of interference channels with comp transmission and reception"
    - "on the spatial degrees of freedom of multicell and multiuser mimo channels"
    - "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-6 (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"
    - "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"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"

Connected through hyperedge HE-7 (induced by source paper "interference alignment for multicell multiuser mimo uplink channels"):
  with members:
    - "degrees of freedom of full duplex multiantenna cellular networks"
    - "cellular interference alignment omni directional antennas and asymmetric configurations"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "cellular interference alignment"
    - "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"
    - "interference alignment for partially connected mimo cellular networks"

Connected through hyperedge HE-8 (induced by source paper "signal and interference leakage minimization in mimo uplink downlink cellular networks"):
  with members:
    - "adaptive beamforming in interference networks via bi directional training"
    - "cooperative algorithms for mimo interference channels"
    - "downlink 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)