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 achievability of interference alignment in the k user constant mimo interference channel"
  Abstract: Interference alignment in the K-user MIMO interference channel with constant channel coefficients is considered. A novel constructive method for finding the interference alignment solution is proposed for the case where the number of transmit antennas equals the number of receive antennas (N T  = N R  = N), the number of transmitter-receiver pairs equals K = N + 1, and all interference alignment multiplexing gains are one. The core of the method consists of solving an eigenvalue problem that incorporates the channel matrices of all interfering links. This procedure provides insight into the feasibility of signal vector spaces alignment schemes in finite dimensional MIMO interference channels.

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"
    - "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"
    - "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"

Connected through hyperedge HE-2 (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"
    - "interference alignment as a rank constrained rank minimization"

Connected through hyperedge HE-3 (induced by source paper "demo non classic interference alignment for downlink cellular networks"):
  with members:
    - "interference alignment for downlink cellular networks joint scheduling and precoding"
    - "spectral and energy efficiency trade offs in cellular networks"
    - "interference alignment for the k user mimo interference channel"
    - "downlink interference alignment"

Connected through hyperedge HE-4 (induced by source paper "maximizing the sum rate in cellular networks using multi convex optimization"):
  with members:
    - "mapel achieving global optimality for a non convex wireless power control problem"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-5 (induced by source paper "hybrid channel pre inversion and interference alignment strategies"):
  with members:
    - "feasibility of interference alignment for the mimo interference channel"
    - "on the degrees of freedom of asymmetric mimo interference broadcast channels"
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "grassmannian differential limited feedback for interference alignment"
    - "degrees of freedom of interference channels with comp transmission and reception"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "interference alignment for the k user mimo interference channel"
    - "cooperative algorithms for mimo interference channels"

Connected through hyperedge HE-6 (induced by source paper "interference alignment via message passing"):
  with members:
    - "dynamic interference mitigation for generalized partially connected quasi static mimo interference channel"
    - "degrees of freedom of the k user m times n mimo interference channel"

Connected through hyperedge HE-7 (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-8 (induced by source paper "the feasibility conditions for interference alignment in mimo networks"):
  with members:
    - "on the degrees of freedom achievable through interference alignment in a mimo interference channel"
    - "settling the feasibility of interference alignment for the mimo interference channel the symmetric square case"
    - "on feasibility of interference alignment in mimo interference networks"
    - "on feasibility of interference alignment in mimo interference networks"
    - "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)