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: "energy efficient antenna selection and power allocation for large scale multiple antenna systems with hybrid energy supply"
  Abstract: The combination of energy harvesting and large-scale multiple antenna technologies provides a promising solution for improving the energy efficiency (EE) by exploiting renewable energy sources and reducing the transmission power per user and per antenna. However, the introduction of energy harvesting capabilities into large-scale multiple antenna systems poses many new challenges for energy-efficient system design due to the intermittent characteristics of renewable energy sources and limited battery capacity. Furthermore, the total manufacture cost and the sum power of a large number of radio frequency (RF) chains can not be ignored, and it would be impractical to use all the antennas for transmission. In this paper, we propose an energy-efficient antenna selection and power allocation algorithm to maximize the EE subject to the constraint of user's quality of service (QoS). An iterative offline optimization algorithm is proposed to solve the non-convex EE optimization problem by exploiting the properties of nonlinear fractional programming. The relationships among maximum EE, selected antenna number, battery capacity, and EE-SE tradeoff are analyzed and verified through computer simulations.

Connected through hyperedge HE-1 (induced by source paper "energy efficient transmission of hybrid array with non ideal power amplifiers and circuitry"):
  with members:
    - "energy efficient transceiver design for hybrid sub array architecture mimo systems"
    - "resolution adaptive hybrid mimo architectures for millimeter wave communications"
    - "effective capacity of licensed assisted access in unlicensed spectrum for 5g from theory to application"
    - "energy efficiency maximization of full duplex two way relay with non ideal power amplifiers and non negligible circuit power"
    - "hybrid beamforming for large antenna arrays with phase shifter selection"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "dynamic subarrays for hybrid precoding in wideband mmwave mimo systems"
    - "deploying dense networks for maximal energy efficiency small cells meet massive mimo"

Connected through hyperedge HE-2 (induced by source paper "optimal transmit antenna selection for massive mimo wiretap channels"):
  with members:
    - "precoding via approximate message passing with instantaneous signal constraints"
    - "asymptotics of nonlinear lse precoders with applications to transmit antenna selection"
    - "asymptotics of transmit antenna selection impact of multiple receive antennas"
    - "on secrecy performance of antenna selection aided mimo systems against eavesdropping"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"
    - "secure massive mimo transmission with an active eavesdropper"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"

Connected through hyperedge HE-3 (induced by source paper "energy efficiency in massive mimo based 5g networks opportunities and challenges"):
  with members:
    - "massive mimo performance evaluation based on measured propagation data"
    - "channel estimation and hybrid precoding for millimeter wave cellular systems"
    - "massive mimo meets hetnet interference coordination through spatial blanking"
    - "optimal design of energy efficient multi user mimo systems is massive mimo the answer"
    - "massive mimo and small cells improving energy efficiency by optimal soft cell coordination"
    - "hetnets and massive mimo modeling potential gains and performance analysis"
    - "energy efficient optimization for wireless information and power transfer in large scale mimo systems employing energy beamforming"
    - "scaling up mimo opportunities and challenges with very large arrays"

Connected through hyperedge HE-4 (induced by source paper "towards se and ee in 5g with noma and massive mimo technologies"):
  with members:
    - "massive mimo for next generation wireless systems"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"
    - "energy and spectral efficiency of very large multiuser mimo 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)