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: "duality polite water filling and optimization for mimo b mac interference networks and itree networks"
  Abstract: The general MIMO interference network is considered and is named the B-MAC Network, for it is a combination of multiple interfering broadcast channels and multiaccess channels. Included as special cases are interference channels, X channels, X networks, and most practical wireless networks. The optimization of this important class of networks has been hindered by that beyond the single antenna multiaccess channels, little is known about the optimal input structure, which is found here to be the polite water-filling, satisfied by all Pareto optimal input. This network version of water-filling is polite because it optimally balances between reducing interference to others and maximizing a link’s own rate, offering a method to decompose a network into multiple equivalent single-user channels and thus, paving the way for designing/improving low-complexity centralized/distributed/game-theoretic algorithms for most network optimization problems. Deeply connected is the rate duality extended to the forward and reverse links of the B-MAC networks. As a demonstration, weighted sum-rate maximization algorithms with superior performance and low complexity are designed for B-MAC networks and are analyzed for Interference Tree (iTree) Networks, a sub-class of the B-MAC networks that possesses promising properties for further information theoretic study.

Connected through hyperedge HE-1 (induced by source paper "dual link algorithm for the weighted sum rate maximization in mimo interference channels"):
  with members:
    - "the weighted sum rate maximization in mimo interference networks the minimax lagrangian duality and algorithm"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "mimo broadcast channel optimization under general linear constraints"
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"

Connected through hyperedge HE-2 (induced by source paper "the weighted sum rate maximization in mimo interference networks the minimax lagrangian duality and algorithm"):
  with members:
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "linear precoding in cooperative mimo cellular networks with limited coordination clusters"
    - "mimo broadcast channel optimization under general linear constraints"
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"

Connected through hyperedge HE-3 (induced by source paper "mixed timescale precoding and cache control in cached mimo interference network"):
  with members:
    - "joint beamforming and power control in coordinated multicell max min duality effective network and large system transition"
    - "femtocaching wireless video content delivery through distributed caching helpers"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"

Connected through hyperedge HE-4 (induced by source paper "duality and optimization for generalized multi hop mimo amplify and forward relay networks with linear constraints"):
  with members:
    - "power allocation in two hop amplify and forward mimo relay systems with qos requirements"
    - "a tutorial on the optimization of amplify and forward mimo relay systems"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"

Connected through hyperedge HE-5 (induced by source paper "linear precoding and equalization for network mimo with partial cooperation"):
  with members:
    - "multi cell mimo downlink with cell cooperation and fair scheduling a large system limit analysis"
    - "rank constrained schur convex optimization with multiple trace log det constraints"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"
    - "optimal multiuser zero forcing with per antenna power constraints for network mimo coordination"
    - "adaptive beamforming in interference networks via bi directional training"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "linear precoding in cooperative mimo cellular networks with limited coordination clusters"
    - "cooperative algorithms for mimo interference channels"

Connected through hyperedge HE-6 (induced by source paper "mimo b mac interference network optimization under rate constraints by polite water filling and duality"):
  with members:
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "technical report mimo b mac interference network optimization under rate constraints by polite water filling and duality"
    - "mimo broadcast channel optimization under general linear constraints"
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"
    - "approaching the capacity of wireless networks through distributed interference alignment"

Connected through hyperedge HE-7 (induced by source paper "technical report mimo b mac interference network optimization under rate constraints by polite water filling and duality"):
  with members:
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"

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)