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: "survey of latest wireless cellular technologies for enhancement of spectral density at reduced cost"
  Abstract: The future of mobile wireless communication networks will include existing 3 rd generation, 4 th generation (implemented in Japan, USA, South Korea etc.), 5 th generation (based on cognitive radio which implies the whole wireless world interconnection & WISDOM – Wireless innovative System for Dynamic Operating Megacommunications concept), 6 th generation (with very high data rates Quality of Service (QoS) and service applications) and 7 th generation (with space roaming). This paper is focused on the specifications of future generations and latest technologies to be used in future wireless mobile communication networks. However keeping in view the general poor masses of India, some of the future generation technologies will be embedded with 2G and 2.5G so that general masses may get the advantage of internet, multimedia services and the operators may get proper revenues with little extra expenditure in the existing mobile communication networks.

Connected through hyperedge HE-1 (induced by source paper "hybrid spectral efficient cellular network deployment to reduce rf pollution"):
  with members:
    - "r f pollution reduction in cellular communication"
    - "an intelligent approach for dense urban area in existing 2g 2 5g"
    - "hierarchical cellular structures in high capacity cellular communication systems"
    - "proposed cellular network for indian conditions for enhancement of spectral density and reduction of power consumption rf pollution"

Connected through hyperedge HE-2 (induced by source paper "r f pollution reduction in cellular communication"):
  with members:
    - "smart antenna for cellular mobile communication"
    - "proposed cellular network for indian conditions for enhancement of spectral density and reduction of power consumption rf pollution"
    - "femtocell networks a survey"

Connected through hyperedge HE-3 (induced by source paper "overview of mc cdma papr reduction techniques"):
  with members:
    - "mc cdma papr reduction techniques using discrete transforms and companding"

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.CY(Computers and Society)