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: "interference alignment as a rank constrained rank minimization"
  Abstract: We show that the maximization of the sum degrees-of-freedom for the static flat-fading multiple-input multiple-output (MIMO) interference channel is equivalent to a rank constrained rank minimization problem (RCRM), when the signal spaces span all available dimensions. The rank minimization corresponds to maximizing interference alignment (IA) so that interference spans the lowest dimensional subspace possible. The rank constraints account for the useful signal spaces spanning all available spatial dimensions. That way, we reformulate all IA requirements to requirements involving ranks. Then, we present a convex relaxation of the RCRM problem inspired by recent results in compressed sensing and low-rank matrix completion theory that rely on approximating rank with the nuclear norm. We show that the convex envelope of the sum of ranks of the interference matrices is the normalized sum of their corresponding nuclear norms and introduce tractable constraints that are asymptotically equivalent to the rank constraints for the initial problem. We also show that our heuristic relaxation can be tuned for the multi-cell interference channel. Furthermore, we experimentally show that in many cases the proposed algorithm attains perfect interference alignment and in some cases outperforms previous approaches for finding precoding and zero-forcing matrices for interference alignment.

Connected through hyperedge HE-1 (induced by source paper "generalized low rank optimization for topological cooperation in ultra dense networks"):
  with members:
    - "no spurious local minima in nonconvex low rank problems a unified geometric analysis"
    - "low rank matrix completion for topological interference management by riemannian pursuit"
    - "matrix completion has no spurious local minimum"
    - "an overview of low rank matrix recovery from incomplete observations"
    - "generalized degrees of freedom of the symmetric k user interference channel under finite precision csit"
    - "large scale convex optimization for dense wireless cooperative networks"
    - "feasibility of interference alignment for the mimo interference channel"
    - "topological interference management with transmitter cooperation"

Connected through hyperedge HE-2 (induced by source paper "low rank matrix completion for topological interference management by riemannian pursuit"):
  with members:
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "large scale convex optimization for dense wireless cooperative networks"
    - "large scale convex optimization for ultra dense cloud ran"
    - "when does an ensemble of matrices with randomly scaled rows lose rank"
    - "feasibility of interference alignment for the mimo interference channel"
    - "a matrix completion approach to linear index coding problem"
    - "topological interference management with transmitter cooperation"
    - "topological interference management through index coding"

Connected through hyperedge HE-3 (induced by source paper "generalized interference alignment part i theoretical framework"):
  with members:
    - "the feasibility conditions for interference alignment in mimo networks"
    - "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"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "settling the feasibility of interference alignment for the mimo interference channel the symmetric square case"
    - "interference alignment for secrecy"
    - "cooperative algorithms for mimo interference channels"
    - "ergodic secret alignment"

Connected through hyperedge HE-4 (induced by source paper "an algebraic approach to a class of rank constrained semi definite programs with applications"):
  with members:
    - "discrete signal processing on graphs frequency analysis"
    - "the emerging field of signal processing on graphs extending high dimensional data analysis to networks and other irregular domains"
    - "discrete signal processing on graphs"
    - "the algebraic combinatorial approach for low rank matrix completion"
    - "phase retrieval via matrix completion"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"
    - "phased mimo radar a tradeoff between phased array and mimo radars"

Connected through hyperedge HE-5 (induced by source paper "interference alignment designs for secure multiuser mimo systems rank constrained rank minimization approach"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"
    - "interference alignment for secrecy"

Connected through hyperedge HE-6 (induced by source paper "low complexity opportunistic interference alignment in k transmitter mimo interference channels"):
  with members:
    - "on the achievable dof and user scaling law of opportunistic interference alignment in 3 transmitter mimo interference channels"
    - "interference alignment with analog channel state feedback"

Connected through hyperedge HE-7 (induced by source paper "particle swarm optimization for weighted sum rate maximization in mimo broadcast channels"):
  with members:
    - "the mimo iterative waterfilling algorithm"

Connected through hyperedge HE-8 (induced by source paper "feasibility of interference alignment for the mimo interference channel"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "on the number of interference alignment solutions for the k user mimo channel with constant coefficients"
    - "interference alignment using finite and dependent channel extensions the single beam case"
    - "the approximate sum capacity of the symmetric gaussian k user interference channel"
    - "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"
    - "interactive interference alignment"
    - "degrees of freedom of interference channels with comp transmission and reception"

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)