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: "artificial noise aided secure transmission in wiretap channels with transmitter side correlation"
  Abstract: This work for the first time examines the impact of transmitter-side correlation on the artificial-noise-aided secure transmission, based on which a new power allocation strategy for artificial noise (AN) is devised for physical layer security enhancement. Specifically, we design a correlation-based power allocation (CPA) for AN, of which the optimality in terms of achieving the minimum secrecy outage probability is analytically proved in the large system regime with the number of transmit antennas approaching infinity. In order to fully reveal the benefits of the CPA, we derive easy-to-evaluate expressions for the secrecy outage probability achieved by the CPA. Our study demonstrates that the CPA is nearly optimal and significantly outperforms the widely-used uniform power allocation (UPA) even for a moderately small number of correlated transmit antennas. Furthermore, our numerical results reveal a fundamental difference between the CPA and UPA. That is when the number of correlated transmit antennas increases, the secrecy outage probability of the CPA always reduces while the secrecy outage probability of the UPA suffers from a saturation point.

Connected through hyperedge HE-1 (induced by source paper "covert transmission with a self sustained relay"):
  with members:
    - "achieving covert wireless communications using a full duplex receiver"
    - "multi hop routing in covert wireless networks"
    - "covert communication achieved by a greedy relay in wireless networks"
    - "wireless powered dense cellular networks how many small cells do we need"
    - "covert communication in fading channels under channel uncertainty"
    - "covert communications with a full duplex receiver over wireless fading channels"
    - "covert communication with finite blocklength in awgn channels"
    - "on covert communication with noise uncertainty"

Connected through hyperedge HE-2 (induced by source paper "pilot based channel estimation design in covert wireless communication"):
  with members:
    - "multi antenna covert communications in random wireless networks"
    - "low probability of detection communication opportunities and challenges"
    - "covert transmission with a self sustained relay"
    - "gaussian signalling for covert communications"
    - "achieving covert wireless communications using a full duplex receiver"
    - "multi hop routing in covert wireless networks"
    - "joint optimization of a uav s trajectory and transmit power for covert communications"
    - "covert wireless communications with channel inversion power control in rayleigh fading"

Connected through hyperedge HE-3 (induced by source paper "covert wireless communications with channel inversion power control in rayleigh fading"):
  with members:
    - "gaussian signalling for covert communications"
    - "achieving covert wireless communications using a full duplex receiver"
    - "adaptive full duplex jamming receiver for secure d2d links in random networks"
    - "covert communication in wireless relay networks"
    - "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 communications with a full duplex receiver over wireless fading channels"

Connected through hyperedge HE-4 (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"
    - "physical layer security jamming theoretical limits and practical designs in wireless networks"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "beamforming design and power allocation for secure transmission with noma"):
  with members:
    - "short packet downlink transmission with non orthogonal multiple access"
    - "joint beamforming and power allocation in downlink noma multiuser mimo networks"
    - "exploiting inter user interference for secure massive non orthogonal multiple access"
    - "robust and secure resource allocation for full duplex miso multicarrier noma systems"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "optimal joint power and subcarrier allocation for mc noma systems"
    - "secrecy sum rate maximization in non orthogonal multiple access"
    - "on the spectral efficiency and security enhancements of noma assisted multicast unicast streaming"

Connected through hyperedge HE-6 (induced by source paper "secrecy energy efficiency optimization for artificial noise aided physical layer security in ofdm based cognitive radio networks"):
  with members:
    - "d2d communications underlaying wireless powered communication networks"
    - "power constrained secrecy rate maximization for joint relay and jammer selection assisted wireless networks"
    - "cognitive network cooperation for green cellular networks"
    - "security of rechargeable energy harvesting transmitters in wireless networks"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "cooperative jamming for secure communications in mimo relay networks"

Connected through hyperedge HE-7 (induced by source paper "power allocation strategy of maximizing secrecy rate for secure directional modulation"):
  with members:
    - "robust secure transmission of using main lobe integration based leakage beamforming in directional modulation mu mimo systems"
    - "directional modulation via symbol level precoding a way to enhance security"
    - "relay selection improves the security reliability trade off in cognitive radio systems"
    - "secure massive mimo transmission in the presence of an active eavesdropper"

Connected through hyperedge HE-8 (induced by source paper "covert communication achieved by a greedy relay in wireless networks"):
  with members:
    - "covert communication in wireless relay networks"
    - "fundamental limits of covert communication over mimo awgn channel"
    - "covert communication in fading channels under channel uncertainty"
    - "covert communication with finite blocklength in awgn channels"
    - "on covert communication with noise uncertainty"
    - "fundamental limits of communication with low probability of detection"
    - "artificial noise aided secure transmission in large scale spectrum sharing networks"
    - "artificial noise aided secure transmission with directional modulation based on random frequency diverse arrays"

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)