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 broadcast channel optimization under general linear constraints"
  Abstract: The optimization of the transmit parameters (power allocation and steering vectors) for the MIMO BC under general linear constraints is treated under the optimal DPC coding strategy and the simple suboptimal linear zero-forcing beamforming strategy. In the case of DPC, we show that "SINR duality" and "min-max duality" yield the same dual MAC problem, and compare two alternatives for its efficient solution. In the case of zero-forcing beamforming, we provide a new efficient algorithm based on the direct optimization of a generalized inverse matrix. In both cases, the algorithms presented here address the problems in the most general form and can be applied to special cases previously considered, such as per-antenna and per-group of antennas power constraints, "forbidden interference direction" constraints, or any combination thereof.

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"
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "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 "vandermonde subspace frequency division multiplexing for two tiered cognitive radio networks"):
  with members:
    - "from spectrum pooling to space pooling opportunistic interference alignment in mimo cognitive networks"
    - "power control in two tier femtocell networks"
    - "secured communication over frequency selective fading channels a practical vandermonde precoding"
    - "vandermonde frequency division multiplexing for cognitive radio"
    - "femtocell networks a survey"

Connected through hyperedge HE-3 (induced by source paper "the weighted sum rate maximization in mimo interference networks the minimax lagrangian duality and algorithm"):
  with members:
    - "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"
    - "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 "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"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "network mimo with linear zero forcing beamforming large system analysis impact of channel estimation and reduced complexity scheduling"):
  with members:
    - "multi cell mimo downlink with cell cooperation and fair scheduling a large system limit analysis"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "on the optimal number of cooperative base stations in network mimo systems"
    - "base station cooperation on the downlink large system analysis"
    - "channel state feedback over the mimo mac"
    - "cooperative multi cell block diagonalization with per base station power constraints"
    - "mimo downlink scheduling with non perfect channel state knowledge"
    - "training and feedback optimization for multiuser mimo downlink"

Connected through hyperedge HE-6 (induced by source paper "compute and forward strategies for cooperative distributed antenna systems"):
  with members:
    - "an algebraic approach to physical layer network coding"
    - "wireless network information flow a deterministic approach"
    - "quantized compute and forward a low complexity architecture for distributed antenna systems"
    - "integer forcing linear receivers"
    - "approximately optimal wireless broadcasting"
    - "approximately achieving gaussian relay network capacity with lattice codes"
    - "compute and forward harnessing interference through structured codes"
    - "distributed mimo receiver achievable rates and upper bounds"

Connected through hyperedge HE-7 (induced by source paper "reverse compute and forward a low complexity architecture for downlink distributed antenna systems"):
  with members:
    - "quantized compute and forward a low complexity architecture for distributed antenna systems"
    - "integer forcing linear receivers"
    - "compute and forward harnessing interference through structured codes"

Connected through hyperedge HE-8 (induced by source paper "mimo b mac interference network optimization under rate constraints by polite water filling and duality"):
  with members:
    - "duality polite water filling and optimization for mimo b mac interference networks and itree networks"
    - "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"
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"
    - "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)