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: "joint ranging and clock parameter estimation by wireless round trip time measurements"
  Abstract: In this paper, we develop a new technique for estimating fine clock errors and range between two nodes simultaneously by two-way time-of-arrival measurements using impulse-radio ultrawideband signals. Estimators for clock parameters and the range are proposed, which are robust with respect to outliers. They are analyzed numerically and by means of experimental measurement campaigns. The technique and derived estimators achieve accuracies below 1 Hz for frequency estimation, below 1 ns for phase estimation, and 20 cm for range estimation, at a 4-m distance using 100-MHz clocks at both nodes. Therefore, we show that the proposed joint approach is practical and can simultaneously provide clock synchronization and positioning in an experimental system.

Connected through hyperedge HE-1 (induced by source paper "climex a wireless physical layer security protocol based on clocked impulse exchanges"):
  with members:
    - "scalable and passive wireless network clock synchronization in los environments"
    - "device fingerprinting in wireless networks challenges and opportunities"
    - "pairwise secret key agreement based on location derived common randomness"
    - "distributed inference in the presence of eavesdroppers a survey"
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "using the physical layer for wireless authentication in time variant channels"
    - "secure vehicular communication systems design and architecture"

Connected through hyperedge HE-2 (induced by source paper "scalable and passive wireless network clock synchronization in los environments"):
  with members:
    - "experimental demonstration of nanosecond accuracy wireless network synchronization"
    - "cooperative synchronization in wireless networks"
    - "an experimental investigation of simo mimo interference alignment ia and coordinated multi point comp"
    - "fundamentals of large sensor networks connectivity capacity clocks and computation"
    - "femtocell networks a survey"

Connected through hyperedge HE-3 (induced by source paper "d slats distributed simultaneous localization and time synchronization"):
  with members:
    - "realizing uncertainty aware timing stack in embedded operating system"
    - "joint localization and clock synchronization for wireless sensor networks"
    - "distributing the kalman filter for large scale systems"

Connected through hyperedge HE-4 (induced by source paper "optimal scheduling for interference mitigation by range information"):
  with members:
    - "exploiting directionality for millimeter wave wireless system improvement"
    - "cooperative localization by dual foot mounted inertial sensors and inter agent ranging"

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.NI(Networking and Internet Architecture)