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: "mimo b mac interference network optimization under rate constraints by polite water filling and duality"
  Abstract: We take two new approaches to design efficient algorithms for transmitter optimization under rate constraints in order to guarantee the Quality of Service for MIMO B-MAC interference networks. A B-MAC network is a generalized interference network that is a combination of multiple interfering broadcast channels (BC) and multiaccess channels (MAC). Two related optimization problems, maximizing the minimum of weighted rates under a sum-power constraint and minimizing the sum-power under rate constraints, are considered. The first approach takes advantage of existing algorithms for SINR problems by building a bridge between rate and SINR through the design of optimal mappings between them. The second approach exploits the polite water-filling structure, which is the network version of water-filling satisfied by all the Pareto optimal input of a large class of achievable regions of B-MAC networks. It replaces most generic optimization algorithms currently used for such networks and reduces the complexity while demonstrating superior performance even in non-convex cases. Both centralized and distributed algorithms are designed and the performance is analyzed in addition to numeric examples.

Connected through hyperedge HE-1 (induced by source paper "how much cache is needed to achieve linear capacity scaling in backhaul limited dense wireless networks"):
  with members:
    - "wireless device to device caching networks basic principles and system performance"
    - "caching in wireless multihop device to device networks"
    - "on fundamental trade offs of device to device communications in large wireless networks"
    - "5g wireless backhaul networks challenges and research advances"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "cache enabled opportunistic cooperative mimo for video streaming in wireless systems"
    - "mixed timescale precoding and cache control in cached mimo interference network"
    - "the throughput outage tradeoff of wireless one hop caching networks"

Connected through hyperedge HE-2 (induced by source paper "unified framework of kkt conditions based matrix optimizations for mimo communications"):
  with members:
    - "on weighted mse model for mimo transceiver optimization"
    - "transceiver designs with matrix version water filling architecture under mixed power constraints"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "miso capacity with per antenna power constraint"

Connected through hyperedge HE-3 (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"
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"
    - "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-4 (induced by source paper "asymptotic scaling laws of wireless adhoc network with physical layer caching"):
  with members:
    - "caching in wireless multihop device to device networks"
    - "living on the edge the role of proactive caching in 5g wireless networks"
    - "cache enabled opportunistic cooperative mimo for video streaming in wireless systems"
    - "mixed timescale precoding and cache control in cached mimo interference network"
    - "asymptotic laws for joint content replication and delivery in wireless networks"
    - "fundamental limits of caching"
    - "femtocaching wireless video content delivery through distributed caching helpers"
    - "the balanced unicast and multicast capacity regions of large wireless networks"

Connected through hyperedge HE-5 (induced by source paper "sinr constrained beamforming for a mimo multi user downlink system"):
  with members:
    - "linear transceiver design for a mimo interfering broadcast channel achieving max min fairness"
    - "a general rate duality of the mimo multiple access channel and the mimo broadcast channel"

Connected through hyperedge HE-6 (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"
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"

Connected through hyperedge HE-7 (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"
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"

Connected through hyperedge HE-8 (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"
    - "optimal multiuser zero forcing with per antenna power constraints for network mimo coordination"
    - "adaptive beamforming in interference networks via bi directional training"
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"
    - "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"

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)