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: "optimal decoding algorithm for asynchronous physical layer network coding"
  Abstract: A key issue in physical-layer network coding (PNC) is how to deal with the asynchrony between signals transmitted by multiple transmitters. That is, symbols transmitted by different transmitters could arrive at the receiver with symbol misalignment as well as relative carrier-phase offset. In this paper, 1) we propose and investigate a general framework based on belief propagation (BP) that can effectively deal with symbol and phase asynchronies; 2) we show that for BPSK and QPSK modulations, our BP method can significantly reduce the SNR penalty due to asynchrony compared with prior methods; 3) we find that symbol misalignment makes the system performance less sensitive and more robust against carrier-phase offset. Observation 3) has the following practical implication. It is relatively easier to control symbol timing than carrier-phase offset. Our results indicate that if we could control the symbol offset in PNC, it would actually be advantageous to deliberately introduce symbol misalignment to desensitize the system to phase offset.

Connected through hyperedge HE-1 (induced by source paper "differential distributed space time coding with imperfect synchronization in frequency selective channels"):
  with members:
    - "differential distributed space time coding with imperfect synchronization"
    - "asynchronous physical layer network coding"
    - "channel coded collision resolution by exploiting symbol misalignment"
    - "distributed beamforming in wireless multiuser relay interference networks with quantized feedback"
    - "ofdm based distributed space time coding for asynchronous relay networks"

Connected through hyperedge HE-2 (induced by source paper "an optimal decoding strategy for physical layer network coding over multipath fading channels"):
  with members:
    - "network coded multiple access"
    - "asynchronous physical layer network coding"
    - "asynchronous physical layer network coding scheme for two way ofdm relay"
    - "implementation of physical layer network coding"
    - "synchronization analysis in physical layer network coding"

Connected through hyperedge HE-3 (induced by source paper "asynchronous convolutional coded physical layer network coding"):
  with members:
    - "a hierarchical modulation for upgrading digital broadcast systems"
    - "physical layer network coding for two way relaying with qam"
    - "asynchronous physical layer network coding"
    - "joint ldpc and physical layer network coding for asynchronous bi directional relaying"
    - "physical layer network coding tutorial survey and beyond"
    - "implementation of physical layer network coding"
    - "channel coding and decoding in a relay system operated with physical layer network coding"

Connected through hyperedge HE-4 (induced by source paper "distributed mac protocol supporting physical layer network coding"):
  with members:
    - "reliable physical layer network coding"
    - "coordinating interfering transmissions in cooperative wireless lans"

Connected through hyperedge HE-5 (induced by source paper "joint compute and forward for the two way relay channel with spatially coupled ldpc codes"):
  with members:
    - "spatially coupled ensembles universally achieve capacity under belief propagation"
    - "on modulo sum computation over an erasure multiple access channel"
    - "asynchronous physical layer network coding"
    - "reliable physical layer network coding"
    - "threshold saturation via spatial coupling why convolutional ldpc ensembles perform so well over the bec"
    - "universal codes for the gaussian mac via spatial coupling"
    - "spatially coupled codes over the multiple access channel"
    - "channel coding and decoding in a relay system operated with physical layer network coding"

Connected through hyperedge HE-6 (induced by source paper "asynchronous physical layer network coding"):
  with members:
    - "on the bcjr algorithm for asynchronous physical layer network coding"
    - "physical layer network coding tutorial survey and beyond"
    - "implementation of physical layer network coding"
    - "channel coded collision resolution by exploiting symbol misalignment"
    - "a message passing approach for joint channel estimation interference mitigation and decoding"
    - "channel coding and decoding in a relay system operated with physical layer network coding"
    - "collision resolution by exploiting symbol misalignment"
    - "physical network coding in two way wireless relay channels"

Connected through hyperedge HE-7 (induced by source paper "physical layer network coding tutorial survey and beyond"):
  with members:
    - "an algebraic approach to physical layer network coding"
    - "eigen direction alignment based physical layer network coding for mimo two way relay channels"
    - "asynchronous physical layer network coding"
    - "non memoryless analog network coding in two way relay channel"
    - "reliable physical layer network coding"
    - "blind known interference cancellation"
    - "wireless mimo switching with zero forcing relaying and network coded relaying"
    - "implementation of physical layer network coding"

Connected through hyperedge HE-8 (induced by source paper "implementation of physical layer network coding"):
  with members:
    - "asynchronous physical layer network coding"
    - "physical layer network coding tutorial survey and beyond"
    - "channel coding and decoding in a relay system operated with physical layer network coding"
    - "physical network coding in two way wireless relay channels"

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)