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: "power and subcarrier allocation for physical layer security in ofdma based broadband wireless networks"
  Abstract: Providing physical-layer security for mobile users in future broadband wireless networks is of both theoretical and practical importance. In this paper, we formulate an analytical framework for resource allocation in a downlink orthogonal frequency-division multiple access (OFDMA)-based broadband network with coexistence of secure users (SUs) and normal users (NUs). The SUs require secure data transmission at the physical layer while the NUs are served with conventional best-effort data traffic. The problem is formulated as joint power and subcarrier allocation with the objective of maximizing average aggregate information rate of all NUs while maintaining an average secrecy rate for each individual SU under a total transmit power constraint for the base station. We solve this problem in an asymptotically optimal manner using dual decomposition. Our analysis shows that an SU becomes a candidate competing for a subcarrier only if its channel gain on this subcarrier is the largest among all and exceeds the second largest by a certain threshold. Furthermore, while the power allocation for NUs follows the conventional water-filling principle, the power allocation for SUs depends on both its own channel gain and the largest channel gain among others. We also develop a suboptimal algorithm to reduce the computational cost. Numerical studies are conducted to evaluate the performance of the proposed algorithms in terms of the achievable pair of information rate for NU and secrecy rate for SU at different power consumptions.

Connected through hyperedge HE-1 (induced by source paper "subcarrier pairing as channel gain tailoring joint resource allocation for relay assisted secure ofdma with untrusted users"):
  with members:
    - "jammer assisted resource allocation in secure ofdma with untrusted users"
    - "utility regions for df relay in ofdma based secure communication with untrusted users"
    - "ofdma based df secure cooperative communication with untrusted users"
    - "secure communications in noma system subcarrier assignment and power allocation"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "on the complexity of joint subcarrier and power allocation for multi user ofdma systems"
    - "joint subcarrier pairing and power allocation for ofdm transmission with decode and forward relaying"

Connected through hyperedge HE-2 (induced by source paper "jammer assisted resource allocation in secure ofdma with untrusted users"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"
    - "on the complexity of joint subcarrier and power allocation for multi user ofdma systems"
    - "on tractability aspects of optimal resource allocation in ofdma systems"
    - "interference assisted secret communication"
    - "a quantitative measure of fairness and discrimination for resource allocation in shared computer systems"

Connected through hyperedge HE-3 (induced by source paper "utility regions for df relay in ofdma based secure communication with untrusted users"):
  with members:
    - "ofdma based df secure cooperative communication with untrusted users"
    - "principles of physical layer security in multiuser wireless networks a survey"

Connected through hyperedge HE-4 (induced by source paper "securing uav communications via joint trajectory and power control"):
  with members:
    - "fundamental tradeoffs in communication and trajectory design for uav enabled wireless network"
    - "capacity characterization of uav enabled two user broadcast channel"
    - "the sky is not the limit lte for unmanned aerial vehicles"
    - "robust trajectory and transmit power design for secure uav communications"
    - "wireless powered cooperative jamming for secure ofdm system"
    - "placement optimization of uav mounted mobile base stations"
    - "joint trajectory and communication design for multi uav enabled wireless networks"
    - "securing uav communications via trajectory optimization"

Connected through hyperedge HE-5 (induced by source paper "sum secrecy rate maximization in a multi carrier mimo wiretap channel with full duplex jamming"):
  with members:
    - "multi objective optimization for robust power efficient and secure full duplex wireless communication systems"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "full duplex relay with jamming protocol for improving physical layer security"
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "in band full duplex wireless challenges and opportunities"
    - "experiment driven characterization of full duplex wireless systems"
    - "full duplex bidirectional mimo achievable rates under limited dynamic range"

Connected through hyperedge HE-6 (induced by source paper "exploiting physical layer security for multiuser multicarrier computation offloading"):
  with members:
    - "probabilistically robust swipt for secrecy misome systems"
    - "a survey on mobile edge computing the communication perspective"
    - "joint offloading and computing optimization in wireless powered mobile edge computing systems"
    - "energy efficient resource allocation for mobile edge computation offloading"
    - "constructive interference based secure precoding a new dimension in physical layer security"
    - "efficient multi user computation offloading for mobile edge cloud computing"

Connected through hyperedge HE-7 (induced by source paper "enhancing physical layer security in af relay assisted multicarrier wireless transmission enhancing physical layer security in af relay assisted multicarrier wireless transmission"):
  with members:
    - "ofdma based df secure cooperative communication with untrusted users"
    - "enhancing physical layer security in dual hop multiuser transmission"
    - "secure communication via an untrusted non regenerative relay in fading channels"
    - "relay placement for physical layer security a secure connection perspective"

Connected through hyperedge HE-8 (induced by source paper "artificial noise aided secrecy information and power transfer in ofdma systems"):
  with members:
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "energy harvesting for physical layer security in ofdma networks"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "energy efficient resource allocation in multiuser ofdm systems with wireless information and power transfer"
    - "resource allocation for secure communication in systems with wireless information and power transfer"
    - "power allocation and time domain artificial noise design for wiretap ofdm with discrete inputs"
    - "spectral efficient optimization in ofdm systems with wireless information and power transfer"

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)