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: "physical layer network coding"
  Abstract: A main distinguishing feature of a wireless network compared with a wired network is its broadcast nature, in which the signal transmitted by a node may reach several other nodes, and a node may receive signals from several other nodes simultaneously. Rather than a blessing, this feature is treated more as an interference-inducing nuisance in most wireless networks today (e.g., IEEE 802.11). The goal of this paper is to show how the concept of network coding can be applied at the physical layer to turn the broadcast property into a capacityboosting advantage in wireless ad hoc networks. Specifically, we propose a physical-layer network coding (PNC) scheme to coordinate transmissions among nodes. In contrast to “straightforward” network coding which performs coding arithmetic on digital bit streams after they have been received, PNC makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent coding operation. PNC can yield higher capacity than straightforward network coding when applied to wireless networks. We believe this is a first paper that ventures into EM-wavebased network coding at the physical layer and demonstrates its potential for boosting network capacity. PNC opens up a whole new research area because of its implications and new design requirements for the physical, MAC, and network layers of ad hoc wireless stations. The resolution of the many outstanding but interesting issues in PNC may lead to a revolutionary new paradigm for wireless ad hoc networking.

Connected through hyperedge HE-1 (induced by source paper "implementation of uplink network coded modulation for two hop networks"):
  with members:
    - "complex linear physical layer network coding"
    - "asynchronous convolutional coded physical layer network coding"
    - "network coded multiple access"
    - "wireless network coding via modified 802 11 mac phy design and implementation on sdr"
    - "asynchronous physical layer network coding"
    - "implementation of physical layer network coding"

Connected through hyperedge HE-2 (induced by source paper "noncoherent ldpc coded physical layer network coding using multitone fsk"):
  with members:
    - "ldpc code design for noncoherent physical layer network coding"
    - "mapping and coding design for channel coded physical layer network coding"
    - "an iterative noncoherent relay receiver for the two way relay channel"
    - "constellation shaping for bit interleaved ldpc coded apsk"
    - "channel coding and decoding in a relay system operated with physical layer network coding"

Connected through hyperedge HE-3 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"

Connected through hyperedge HE-4 (induced by source paper "noncoherent analog network coding using ldpc coded fsk"):
  with members:
    - "an iterative noncoherent relay receiver for the two way relay channel"

Connected through hyperedge HE-5 (induced by source paper "two time slot bidirectional relaying in molecular communication"):
  with members:
    - "physical layer network coding in molecular two way relay networks"
    - "physical network coding in two way wireless relay channels"

Connected through hyperedge HE-6 (induced by source paper "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"):
  with members:
    - "a new dof upper bound and its achievability for k user mimo y channels"
    - "generalized signal alignment for mimo two way x relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-7 (induced by source paper "arq for physical layer network coding"):
  with members:
    - "network codes for real time applications"
    - "joint channel estimation and channel decoding in physical layer network coding systems an em bp factor graph framework"
    - "asynchronous convolutional coded physical layer network coding"
    - "asynchronous physical layer network coding with quasi cyclic codes"
    - "building blocks of physical layer network coding"
    - "distributed mac protocol supporting physical layer network coding"
    - "asynchronous physical layer network coding"
    - "reliable physical layer network coding"

Connected through hyperedge HE-8 (induced by source paper "near optimal modulo and forward scheme for the untrusted relay channel"):
  with members:
    - "secure communication via an untrusted non regenerative relay in fading channels"
    - "achieving the secrecy capacity of wiretap channels using polar codes"
    - "nested polar codes for wiretap and relay channels"
    - "channel coding and decoding in a relay system operated with physical layer network coding"
    - "on the throughput of secure hybrid arq protocols for gaussian block fading channels"
    - "providing secrecy with lattice codes"
    - "generalized degrees of freedom of the symmetric gaussian k user interference channel"
    - "relay subset selection in wireless networks using partial decode and forward transmission"

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)