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: "a game theoretic approach to energy efficient modulation in cdma networks with delay qos constraints"
  Abstract: A game-theoretic framework is used to study the effect of constellation size on the energy efficiency of wireless networks for M-QAM modulation. A non-cooperative game is proposed in which each user seeks to choose its transmit power (and possibly transmit symbol rate) as well as the constellation size in order to maximize its own utility while satisfying its delay quality-of-service (QoS) constraint. The utility function used here measures the number of reliable bits transmitted per joule of energy consumed, and is particularly suitable for energy-constrained networks. The best-response strategies and Nash equilibrium solution for the proposed game are derived. It is shown that in order to maximize its utility (in bits per joule), a user must choose the lowest constellation size that can accommodate the user's delay constraint. This strategy is different from one that would maximize spectral efficiency. Using this framework, the tradeoffs among energy efficiency, delay, throughput and constellation size are also studied and quantified. In addition, the effect of trellis-coded modulation on energy efficiency is discussed.

Connected through hyperedge HE-1 (induced by source paper "energy aware competitive power allocation for heterogeneous networks under qos constraints"):
  with members:
    - "power control in networks with heterogeneous users a quasi variational inequality approach"
    - "what will 5g be"
    - "optimal design of energy efficient multi user mimo systems is massive mimo the answer"
    - "designing multi user mimo for energy efficiency when is massive mimo the answer"
    - "framework for link level energy efficiency optimization with informed transmitter"
    - "energy efficient precoding for multiple antenna terminals"
    - "optimal linear precoding strategies for wideband noncooperative systems based on game theory part i nash equilibria"
    - "competitive design of multiuser mimo systems based on game theory a unified view"

Connected through hyperedge HE-2 (induced by source paper "adaptive power allocation and control in time varying multi carrier mimo networks"):
  with members:
    - "joint channel selection and power control in infrastructureless wireless networks a multiplayer multiarmed bandit framework"
    - "resource allocation for power minimization in the downlink of thp based spatial multiplexing mimo ofdma systems"
    - "what will 5g be"
    - "transmit without regrets online optimization in mimo ofdm cognitive radio systems"
    - "mirror descent meets fixed share and feels no regret"
    - "distributed learning policies for power allocation in multiple access channels"
    - "regularization techniques for learning with matrices"
    - "power allocation games for mimo multiple access channels with coordination"

Connected through hyperedge HE-3 (induced by source paper "robust additively coupled games"):
  with members:
    - "robust rate maximization game under bounded channel uncertainty"
    - "optimal linear precoding strategies for wideband noncooperative systems based on game theory part i nash equilibria"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"
    - "optimal linear precoding strategies for wideband non cooperative systems based on game theory part ii algorithms"

Connected through hyperedge HE-4 (induced by source paper "efficient and distributed sinr based joint resource allocation and base station assignment in wireless cdma networks"):
  with members:
    - "energy efficient resource allocation in wireless networks with quality of service constraints"

Connected through hyperedge HE-5 (induced by source paper "energy efficient communications in cdma networks a game theoretic analysis considering operating costs"):
  with members:
    - "energy efficient power control in impulse radio uwb wireless networks"
    - "energy efficient resource allocation in wireless networks"
    - "randomly spread cdma asymptotics via statistical physics"

Connected through hyperedge HE-6 (induced by source paper "energy efficient resource allocation in wireless networks"):
  with members:
    - "energy efficient resource allocation in wireless networks with quality of service constraints"
    - "a non cooperative power control game in delay constrained multiple access networks"

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)