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: "frame based precoding in satellite communications a multicast approach"
  Abstract: In the present work, a multibeam satellite that employs aggressive frequency reuse towards increasing the offered throughput is considered. Focusing on the forward link, the goal is to employ multi-antenna signal processing techniques, namely linear precoding, to manage the inter-beam interferences. In this context, fundamental practical limitations, namely the rigid framing structure of satellite communication standards and the on-board per-antenna power constraints, are herein considered. Therefore, the concept of optimal frame based precoding under per-antenna constraints, is discussed. This consists in precoding the transmit signals without changing the underlying framing structure of the communication standard. In the present work, the connection of the frame based precoding problem with the generic signal processing problem of conveying independent sets of common data to distinct groups of users is established. This model is known as physical layer multicasting to multiple co-channel groups. Building on recent results, the weighted fair per-antenna power constrained multigroup multicast precoders are employed for frame based precoding. The throughput performance of these solutions is compared to multicast aware heuristic precoding methods over a realistic multibeam satellite scenario. Consequently, the gains of the proposed approach are quantified via extensive numerical results.

Connected through hyperedge HE-1 (induced by source paper "generalized multicast multibeam precoding for satellite communications"):
  with members:
    - "dvb s2x enabled precoding for high throughput satellite systems"
    - "multicast multigroup precoding and user scheduling for frame based satellite communications"
    - "multi gateway cooperation in multibeam satellite systems"
    - "generic optimization of linear precoding in multibeam satellite systems"

Connected through hyperedge HE-2 (induced by source paper "precoding in multibeam satellite communications present and future challenges"):
  with members:
    - "multicast multigroup precoding and user scheduling for frame based satellite communications"
    - "sum rate maximizing multigroup multicast beamforming under per antenna power constraints"
    - "full frequency reuse multibeam satcoms frame based precoding and user scheduling"
    - "weighted fair multicast multigroup beamforming under per antenna power constraints"
    - "gateway switching in q v band satellite feeder links"
    - "multi gateway cooperation in multibeam satellite systems"

Connected through hyperedge HE-3 (induced by source paper "precoding in multigateway multibeam satellite systems"):
  with members:
    - "ergodic capacity analysis of free space optical links with nonzero boresight pointing errors"
    - "dvb s2x enabled precoding for high throughput satellite systems"
    - "multicast multigroup precoding and user scheduling for frame based satellite communications"
    - "multi gateway cooperation in multibeam satellite systems"
    - "generic optimization of linear precoding in multibeam satellite systems"

Connected through hyperedge HE-4 (induced by source paper "multicast multigroup precoding and user scheduling for frame based satellite communications"):
  with members:
    - "optimal multiuser transmit beamforming a difficult problem with a simple solution structure"
    - "sum rate maximizing multigroup multicast beamforming under per antenna power constraints"
    - "multicast multigroup beamforming under per antenna power constraints"
    - "weighted fair multicast multigroup beamforming under per antenna power constraints"
    - "user scheduling for coordinated dual satellite systems with linear precoding"
    - "multi gateway cooperation in multibeam satellite systems"
    - "generic optimization of linear precoding in multibeam satellite systems"

Connected through hyperedge HE-5 (induced by source paper "dvb s2x enabled precoding for high throughput satellite systems"):
  with members:
    - "full frequency reuse multibeam satcoms frame based precoding and user scheduling"
    - "weighted fair multicast multigroup beamforming under per antenna power constraints"
    - "gateway switching in q v band satellite feeder links"
    - "generic optimization of linear precoding in multibeam satellite systems"

Connected through hyperedge HE-6 (induced by source paper "weighted fair multicast multigroup beamforming under per antenna power constraints"):
  with members:
    - "multicast multigroup beamforming under per antenna power constraints"
    - "coordinated multicast beamforming in multicell networks"
    - "generic optimization of linear precoding in multibeam satellite systems"

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)