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 feasibility of linear interference alignment for mimo interference broadcast channels with constant coefficients"
  Abstract: In this paper, we analyze the feasibility of linear interference alignment (IA) for multi-input-multi-output (MIMO) interference broadcast channel (MIMO-IBC) with constant coefficients. We pose and prove the necessary conditions of linear IA feasibility for general MIMO-IBC. Except for the proper condition, we find another necessary condition to ensure a kind of irreducible interference to be eliminated. We then prove the necessary and sufficient conditions for a special class of MIMO-IBC, where the numbers of antennas are divisible by the number of data streams per user. Since finding an invertible Jacobian matrix is crucial for the sufficiency proof, we first analyze the impact of sparse structure and repeated structure of the Jacobian matrix. Considering that for the MIMO-IBC the sub-matrices of the Jacobian matrix corresponding to the transmit and receive matrices have different repeated structure, we find an invertible Jacobian matrix by constructing the two sub-matrices separately. We show that for the MIMO-IBC where each user has one desired data stream, a proper system is feasible. For symmetric MIMO-IBC, we provide proper but infeasible region of antenna configurations by analyzing the difference between the necessary conditions and the sufficient conditions of linear IA feasibility.

Connected through hyperedge HE-1 (induced by source paper "role of interference alignment in wireless cellular network optimization"):
  with members:
    - "joint beamforming and power control in coordinated multicell max min duality effective network and large system transition"
    - "multilevel topological interference management"
    - "genie chain and degrees of freedom of symmetric mimo interference broadcast channels"
    - "degrees of freedom of mimo cellular networks decomposition and linear beamforming design"
    - "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"
    - "degrees of freedom of interference channels with comp transmission and reception"

Connected through hyperedge HE-2 (induced by source paper "distributed long term base station clustering in cellular networks using coalition formation"):
  with members:
    - "adaptive pilot clustering in heterogeneous massive mimo networks"
    - "globally optimal base station clustering in interference alignment based multicell networks"
    - "cooperative base station coloring for pair wise multi cell coordination"
    - "overhead aware distributed csi selection in the mimo interference channel"
    - "interference alignment aided base station clustering using coalition formation"
    - "what will 5g be"
    - "coalitional games in partition form for joint spectrum sensing and access in cognitive radio networks"
    - "fundamental limits of cooperation"

Connected through hyperedge HE-3 (induced by source paper "globally optimal base station clustering in interference alignment based multicell networks"):
  with members:
    - "distributed long term base station clustering in cellular networks using coalition formation"
    - "adaptive pilot clustering in heterogeneous massive mimo networks"
    - "user partitioning for less overhead in mimo interference channels"
    - "interference alignment with analog channel state feedback"
    - "interference alignment with limited feedback"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-4 (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"
    - "genie chain and degrees of freedom of symmetric mimo interference broadcast channels"
    - "degrees of freedom of mimo cellular networks decomposition and linear beamforming design"
    - "regularized zero forcing interference alignment for the two cell mimo interfering broadcast channel"

Connected through hyperedge HE-5 (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"
    - "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-6 (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"
    - "degrees of freedom of uplink downlink multiantenna cellular networks"
    - "cellular interference alignment"
    - "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-7 (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"
    - "limited feedback design for interference alignment on mimo interference networks with heterogeneous path loss and spatial correlations"
    - "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-8 (induced by source paper "on non integer linear degrees of freedom of constant two cell mimo cellular networks"):
  with members:
    - "genie tree and degrees of freedom of the symmetric mimo interfering broadcast channel"
    - "genie chain and degrees of freedom of symmetric mimo interference broadcast channels"
    - "maximum rate transmission with improved diversity gain for interference networks"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "spatial degrees of freedom of the multicell mimo multiple access channel"
    - "downlink interference alignment"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

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)