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: "optimization of code rates in sisome wiretap channels"
  Abstract: We propose a new framework for determining the wiretap code rates of single-input–single-output multiantenna eavesdropper wiretap channels when the capacity of the eavesdropper's channel is not available at the transmitter. In our framework, we introduce the effective secrecy throughput (EST) as a new performance metric that explicitly captures the two key features of wiretap channels, namely, reliability and secrecy. Notably, the EST measures the average rate of the confidential information transmitted from the transmitter to the intended receiver without being eavesdropped on. We provide easy-to-implement methods to determine the wiretap code rates for two transmission schemes: 1) adaptive transmission scheme in which the capacity of the main channel is available at the transmitter and 2) fixed-rate transmission scheme in which the capacity of the main channel is not available at the transmitter. Such determinations are further extended into an absolute-passive eavesdropping scenario where even the average signal-to-noise ratio of the eavesdropper's channel is not available at the transmitter. Notably, our solutions for the wiretap code rates do not require us to set reliability or secrecy constraints for the transmission within wiretap channels.

Connected through hyperedge HE-1 (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-2 (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"
    - "artificial noise aided secure transmission in wiretap channels with transmitter side correlation"

Connected through hyperedge HE-3 (induced by source paper "secrecy rate of distributed cooperative mimo in the presence of multi antenna eavesdropper"):
  with members:
    - "cooperative secure transmission by exploiting social ties in random networks"
    - "on secrecy performance of antenna selection aided mimo systems against eavesdropping"
    - "optimal signaling for secure communications over gaussian mimo wiretap channels"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "power allocation in mimo wiretap channel with statistical csi and finite alphabet input"
    - "on secrecy capacity of fast fading mimome wiretap channels with statistical csit"
    - "full rank solutions for the mimo gaussian wiretap channel with an average power constraint"
    - "on secrecy rate of the generalized artificial noise assisted secure beamforming for wiretap channels"

Connected through hyperedge HE-4 (induced by source paper "power constrained secrecy rate maximization for joint relay and jammer selection assisted wireless networks"):
  with members:
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "joint relay and jammer selection improves the physical layer security in the face of csi feedback delays"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "multi antenna relay aided wireless physical layer security"
    - "optimal relay selection for physical layer security in cooperative wireless networks"
    - "on cooperative relaying schemes for wireless physical layer security"
    - "joint relay and jammer selection for secure two way relay networks"
    - "cooperative jamming for secure communications in mimo relay networks"

Connected through hyperedge HE-5 (induced by source paper "covert communication with finite blocklength in awgn channels"):
  with members:
    - "covert communication in fading channels under channel uncertainty"
    - "on covert communication with noise uncertainty"
    - "fundamental limits of communication with low probability of detection"
    - "covert communication over noisy channels a resolvability perspective"
    - "lpd communication when the warden does not know when"
    - "throughput of cognitive radio systems with finite blocklength codes"
    - "reliable deniable communication hiding messages in noise"
    - "limits of reliable communication with low probability of detection on awgn channels"

Connected through hyperedge HE-6 (induced by source paper "secure precise wireless transmission with random subcarrier selection based directional modulation transmit antenna array"):
  with members:
    - "covert communication in wireless relay networks"
    - "symbol level and multicast precoding for multiuser multiantenna downlink a survey classification and challenges"
    - "the random frequency diverse array a new antenna structure for uncoupled direction range indication in active sensing"
    - "artificial noise aided secure transmission in wiretap channels with transmitter side correlation"
    - "location based beamforming for enhancing secrecy in rician wiretap channels"
    - "directional modulation via symbol level precoding a way to enhance security"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "relay selection improves the security reliability trade off in cognitive radio systems"

Connected through hyperedge HE-7 (induced by source paper "artificial noise aided secure transmission in wiretap channels with transmitter side correlation"):
  with members:
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "location based beamforming for enhancing secrecy in rician wiretap channels"
    - "artificial noise aided secure multi antenna transmission with limited feedback"
    - "achieving secrecy without knowing the number of eavesdropper antennas"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"

Connected through hyperedge HE-8 (induced by source paper "artificial noise aided secure transmission with directional modulation based on random frequency diverse arrays"):
  with members:
    - "the random frequency diverse array a new antenna structure for uncoupled direction range indication in active sensing"
    - "on secrecy metrics for physical layer security over quasi static fading channels"
    - "location based beamforming for enhancing secrecy in rician wiretap channels"
    - "secrecy wireless information and power transfer challenges and opportunities"
    - "improving physical layer security in wireless communications using diversity techniques"
    - "wireless physical layer security with imperfect channel state information a survey"

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)