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: "analysis of energy efficiency in fading channels under qos constraints"
  Abstract: Energy efficiency in fading channels in the presence of Quality of Service (QoS) constraints is studied. Effective capacity, which provides the maximum arrival rate that a wireless channel can sustain while satisfying statistical QoS constraints, is considered. Spectral efficiency--bit energy tradeoff is analyzed in the low-power and wideband regimes by employing the effective capacity formulation, rather than the Shannon capacity. Through this analysis, energy requirements under QoS constraints are identified. The analysis is conducted under two assumptions: perfect channel side information (CSI) available only at the receiver and perfect CSI available at both the receiver and transmitter. In particular, it is shown in the low-power regime that the minimum bit energy required under QoS constraints is the same as that attained when there are no such limitations. However, this performance is achieved as the transmitted power vanishes. Through the wideband slope analysis, the increased energy requirements at low but nonzero power levels in the presence of QoS constraints are determined. A similar analysis is also conducted in the wideband regime, and minimum bit energy and wideband slope expressions are obtained. In this regime, the required bit energy levels are found to be strictly greater than those achieved when Shannon capacity is considered. Overall, a characterization of the energy-bandwidth-delay tradeoff is provided.

Connected through hyperedge HE-1 (induced by source paper "distribution of the sum of fisher snedecor mathcal f random variables and its applications"):
  with members:
    - "on the statistics of the ratio of non constrained arbitrary alpha mu random variables a general framework and applications"
    - "rician k factor based analysis of xlos service probability in 5g outdoor ultra dense networks"
    - "on the multivariate gamma gamma distribution with arbitrary correlation and applications in wireless communications"
    - "on the ergodic capacity of mimo free space optical systems over turbulence channels"

Connected through hyperedge HE-2 (induced by source paper "effective capacity in wireless networks a comprehensive survey"):
  with members:
    - "ultra reliable and low latency wireless communication tail risk and scale"
    - "performance analysis of noma for ultra reliable and low latency communications"
    - "wireless access for ultra reliable low latency communication urllc principles and building blocks"
    - "secure transmission of delay sensitive data over wireless fading channels"
    - "energy efficient ofdma networks maintaining statistical qos guarantees for delay sensitive traffic"
    - "statistical qos analysis of full duplex and half duplex heterogeneous cellular networks"
    - "effective capacity of retransmission schemes a recurrence relation approach"
    - "backlog and delay reasoning in harq systems"

Connected through hyperedge HE-3 (induced by source paper "fundamental green tradeoffs progresses challenges and impacts on 5g networks"):
  with members:
    - "spectrum power trading for energy efficient small cell"
    - "power efficient resource allocation for full duplex radio distributed antenna networks"
    - "energy recycling full duplex radios for next generation networks"
    - "energy efficient resource allocation for wireless powered communication networks"
    - "multi objective optimization for robust power efficient and secure full duplex wireless communication systems"
    - "hybrid millimeter wave systems a novel paradigm for hetnets"
    - "coexistence of wi fi and heterogeneous small cell networks sharing unlicensed spectrum"
    - "on the spectral efficiency of full duplex small cell wireless systems"

Connected through hyperedge HE-4 (induced by source paper "secure transmission of delay sensitive data over wireless fading channels"):
  with members:
    - "secure communications in the presence of a buffer aided wireless powered relay with self energy recycling"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "joint power control in wiretap interference channels"
    - "cross layer scheduling for ofdma based cognitive radio systems with delay and security constraints"
    - "opportunistic secrecy with a strict delay constraint"
    - "energy efficient optimization for physical layer security in multi antenna downlink networks with qos guarantee"
    - "secure wireless communication and optimal power control under statistical queueing constraints"
    - "secure communication in the low snr regime"

Connected through hyperedge HE-5 (induced by source paper "energy efficiency optimization for mimo ofdm mobile multimedia communication systems with qos constraints"):
  with members:
    - "energy efficiency evaluation of cellular networks based on spatial distributions of traffic load and power consumption"
    - "performance analysis of mimo mrc in double correlated rayleigh environments"

Connected through hyperedge HE-6 (induced by source paper "effective capacity of two hop wireless communication systems"):
  with members:
    - "statistical delay control and qos driven power allocation over two hop wireless relay links"

Connected through hyperedge HE-7 (induced by source paper "secure wireless communication and optimal power control under statistical queueing constraints"):
  with members:
    - "secure broadcasting over fading channels with statistical qos constraints"
    - "secure communication over fading channels with statistical qos constraints"
    - "on the delay limited secrecy capacity of fading channels"
    - "the impact of qos constraints on the energy efficiency of fixed rate wireless transmissions"
    - "discrete memoryless interference and broadcast channels with confidential messages secrecy rate regions"
    - "secrecy capacity of a class of broadcast channels with an eavesdropper"

Connected through hyperedge HE-8 (induced by source paper "channel coding over multiple coherence blocks with queueing constraints"):
  with members:
    - "throughput analysis of buffer constrained wireless systems in the finite blocklength regime"
    - "coding versus arq in fading channels how reliable should the phy be"
    - "the impact of qos constraints on the energy efficiency of fixed rate wireless transmissions"

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)