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: "physical layer security jamming theoretical limits and practical designs in wireless networks"
  Abstract: Physical layer security has been recently recognized as a promising new design paradigm to provide security in wireless networks. In addition to the existing conventional cryptographic methods, physical layer security exploits the dynamics of fading channels to enhance secured wireless links. In this approach, jamming plays a key role by generating noise signals to confuse the potential eavesdroppers, and significantly improves quality and reliability of secure communications between legitimate terminals. This article presents theoretical limits and practical designs of jamming approaches for physical layer security. In particular, the theoretical limits explore the achievable secrecy rates of user cooperation based jamming whilst the centralized, and game theoretic based precoding techniques are reviewed for practical implementations. In addition, the emerging wireless energy harvesting techniques are exploited to harvest the required energy to transmit jamming signals. Future directions of these approaches, and the associated research challenges are also briefly outlined.

Connected through hyperedge HE-1 (induced by source paper "energy efficiency optimization for secure transmission in miso cognitive radio network with energy harvesting"):
  with members:
    - "robust designs of beamforming and power splitting for distributed antenna systems with wireless energy harvesting"
    - "enhancing phy security of miso noma swipt systems with a practical non linear eh model"
    - "resource allocation for secure miso noma cognitive radios relying on swipt"
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "beamforming and power splitting designs for an aided secure multi user mimo swipt systems"
    - "secure energy efficiency optimization for miso cognitive radio network with energy harvesting"
    - "limited feedback scheme for device to device communications in 5g cellular networks with reliability and cellular secrecy outage constraints"
    - "joint offloading and computing optimization in wireless powered mobile edge computing systems"

Connected through hyperedge HE-2 (induced by source paper "achieving covert wireless communications using a full duplex receiver"):
  with members:
    - "covert wireless communications with channel inversion power control in rayleigh fading"
    - "covert communication achieved by a greedy relay in wireless networks"
    - "covert wireless communication with a poisson field of interferers"
    - "covert communication in fading channels under channel uncertainty"
    - "covert wireless communication with artificial noise generation"
    - "covert communications with a full duplex receiver over wireless fading channels"
    - "on covert communication with noise uncertainty"
    - "fundamental limits of communication with low probability of detection"

Connected through hyperedge HE-3 (induced by source paper "on the secrecy performance of swipt receiver architectures with multiple eavesdroppers"):
  with members:
    - "secrecy outage for wireless sensor networks"
    - "secrecy outage of swipt in the presence of cooperating eavesdroppers"
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "artificial noise aided secrecy information and power transfer in ofdma systems"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "opportunistic wireless energy harvesting in cognitive radio networks"
    - "simultaneous information and power transfer for broadband wireless systems"

Connected through hyperedge HE-4 (induced by source paper "beamforming techniques for non orthogonal multiple access in 5g cellular networks"):
  with members:
    - "exploiting multiple antenna techniques for non orthogonal multiple access"
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "robust beamforming techniques for non orthogonal multiple access systems with bounded channel uncertainties"
    - "limited feedback scheme for device to device communications in 5g cellular networks with reliability and cellular secrecy outage constraints"
    - "design of massive mimo noma with limited feedback"
    - "a minorization maximization method for optimizing sum rate in the downlink of non orthogonal multiple access systems"
    - "the application of mimo to non orthogonal multiple access"
    - "fairness for non orthogonal multiple access in 5g systems"

Connected through hyperedge HE-5 (induced by source paper "robust beamforming for an aided miso swipt system with unknown eavesdroppers and non linear eh model"):
  with members:
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "secure energy efficiency optimization for miso cognitive radio network with energy harvesting"
    - "robust beamforming for swipt systems with non linear energy harvesting model"
    - "secure multicast communications with private jammers"
    - "secrecy rate maximization for miso multicasting swipt system with power splitting scheme"
    - "power allocation and scheduling for swipt systems with non linear energy harvesting model"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"

Connected through hyperedge HE-6 (induced by source paper "secure routing with power optimization for ad hoc networks"):
  with members:
    - "secure transmission in linear multihop relaying networks"
    - "a primer on cellular network analysis using stochastic geometry"
    - "physical layer security in heterogeneous cellular networks"
    - "secure routing in multihop wireless ad hoc networks with decode and forward relaying"
    - "optimizing df cognitive radio networks with full duplex enabled energy access points"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "on the throughput cost of physical layer security in decentralized wireless networks"

Connected through hyperedge HE-7 (induced by source paper "uav enabled cooperative jamming for improving secrecy of ground wiretap channel"):
  with members:
    - "wireless communications with unmanned aerial vehicles opportunities and challenges"

Connected through hyperedge HE-8 (induced by source paper "secure energy efficiency optimization for miso cognitive radio network with energy harvesting"):
  with members:
    - "secure communications with cooperative jamming optimal power allocation and secrecy outage analysis"
    - "secrecy rate maximization for miso multicasting swipt system with power splitting scheme"
    - "power efficient and secure multiuser communication systems with wireless information and power transfer"
    - "evolution toward 5g multi tier cellular wireless networks an interference management perspective"
    - "wireless information and power transfer architecture design and rate energy tradeoff"
    - "on cooperative relaying schemes for wireless physical layer security"

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)