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: "limited feedback design for interference alignment on mimo interference networks with heterogeneous path loss and spatial correlations"
  Abstract: Interference alignment is degree of freedom optimal on    $K$  -user MIMO interference channels and many previous works have studied the transceiver designs. However, these works predominantly focus on networks with perfect channel state information at the transmitters and symmetrical interference topology. In this paper, we consider a limited feedback system with heterogeneous path loss and spatial correlations and investigate how the dynamics of the interference topology can be exploited to improve the feedback efficiency. We propose a novel spatial codebook design and perform dynamic quantization via bit allocations to adapt to the asymmetry of the interference topology. We bound the system throughput under the proposed dynamic scheme in terms of the transmit SNR, feedback bits, and the interference topology parameters. It is shown that when the number of feedback bits scales with SNR as   $C_{s}\cdot \log {\hbox{SNR}}+ {\cal O}(1)$  , the sum degrees of freedom of the network are preserved. Moreover, the value of scaling coefficient    $C_{s}$   can be significantly reduced in networks with asymmetric interference topology.

Connected through hyperedge HE-1 (induced by source paper "an overview on resource allocation techniques for multi user mimo systems"):
  with members:
    - "low complexity downlink user selection for massive mimo systems"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "user association in 5g networks a survey and an outlook"
    - "cell free massive mimo versus small cells"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "on the number of rf chains and phase shifters and scheduling design with hybrid analog digital beamforming"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"

Connected through hyperedge HE-2 (induced by source paper "feedback design for multi antenna k tier heterogeneous downlink cellular networks"):
  with members:
    - "cooperative base station coloring for pair wise multi cell coordination"
    - "on the optimal feedback rate in interference limited multi antenna cellular systems"
    - "achievable sum dof of the k user mimo interference channel with delayed csit"
    - "distributed channel estimation and pilot contamination analysis for massive mimo ofdm systems"
    - "spectral efficiency of dynamic coordinated beamforming a stochastic geometry approach"
    - "downlink cellular network analysis with multi slope path loss models"
    - "user centric intercell interference nulling for downlink small cell networks"
    - "interference coordination random clustering and adaptive limited feedback"

Connected through hyperedge HE-3 (induced by source paper "on interference alignment with imperfect csi characterizations of outage probability ergodic rate and ser"):
  with members:
    - "performance analysis and optimization for interference alignment over mimo interference channels with limited feedback"
    - "the feasibility conditions for interference alignment in mimo networks"
    - "on the achievable dof and user scaling law of opportunistic interference alignment in 3 transmitter mimo interference channels"
    - "interference aware resource control in multi antenna cognitive ad hoc networks with heterogeneous delay constraints"
    - "performance analysis for physical layer security in multi antenna downlink networks with limited csi feedback"
    - "opportunistic interference alignment for mimo interfering multiple access channels"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "distributed robust multicell coordinated beamforming with imperfect csi an admm approach"

Connected through hyperedge HE-4 (induced by source paper "grouping based interference alignment with ia cell assignment in multi cell mimo mac under limited feedback"):
  with members:
    - "user selection in mimo interfering broadcast channels"
    - "what will 5g be"
    - "interference alignment with quantized grassmannian feedback in the k user constant mimo interference channel"
    - "low complexity sum rate maximization for single and multiple stream mimo af relay networks"
    - "spatial degrees of freedom of the multicell mimo multiple access channel"
    - "on feasibility of interference alignment in mimo interference networks"
    - "downlink interference alignment"
    - "interference alignment under limited feedback for mimo interference channels"

Connected through hyperedge HE-5 (induced by source paper "performance analysis and optimization for interference alignment over mimo interference channels with limited feedback"):
  with members:
    - "the feasibility conditions for interference alignment in mimo networks"
    - "interference aware resource control in multi antenna cognitive ad hoc networks with heterogeneous delay constraints"
    - "robust lattice alignment for k user mimo interference channels with imperfect channel knowledge"
    - "multi mode transmission for the mimo broadcast channel with imperfect channel state information"
    - "cooperative precoding with limited feedback for mimo interference channels"
    - "on feasibility of interference alignment in mimo interference networks"
    - "downlink interference alignment"
    - "interference alignment under limited feedback for mimo interference channels"

Connected through hyperedge HE-6 (induced by source paper "interference alignment with partial csi feedback in mimo cellular networks"):
  with members:
    - "the feasibility conditions for interference alignment in mimo networks"
    - "on the feasibility of linear interference alignment for mimo interference broadcast channels with constant coefficients"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "grassmannian differential limited feedback for interference alignment"
    - "interference alignment with incomplete csit sharing"
    - "interference alignment for partially connected mimo cellular networks"
    - "on feasibility of interference alignment in mimo interference networks"
    - "downlink interference alignment"

Connected through hyperedge HE-7 (induced by source paper "csi feedback reduction for mimo interference alignment"):
  with members:
    - "the feasibility conditions for interference alignment in mimo networks"
    - "csit sharing over finite capacity backhaul for spatial interference alignment"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "interference alignment with quantized grassmannian feedback in the k user constant mimo interference channel"
    - "grassmannian differential limited feedback for interference alignment"
    - "interference alignment with incomplete csit sharing"
    - "feedback topology designs for interference alignment in mimo interference channels"
    - "mimo interference alignment over correlated channels with imperfect csi"

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)