human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "physical layer network coding tutorial survey and beyond"):
  Abstract: The concept of physical-layer network coding (PNC) was proposed in 2006 for application in wireless networks. Since then it has developed into a subfield of network coding with wide followings. The basic idea of PNC is to exploit the network coding operation that occurs naturally when electromagnetic (EM) waves are superimposed on one another. This simple idea turns out to have profound and fundamental ramifications. Subsequent works by various researchers have led to many new results in the domains of 1) wireless communication; 2) wireless information theory; and 3) wireless networking. The purpose of this paper is fourfold. First, we give a brief tutorial on the basic concept of PNC. Second, we survey and discuss recent key results in the three aforementioned areas. Third, we examine a critical issue in PNC: synchronization. It has been a common belief that PNC requires tight synchronization. Our recent results suggest, however, that PNC may actually benefit from asynchrony. Fourth, we propose that PNC is not just for wireless networks; it can also be useful in optical networks. We provide an example showing that the throughput of a passive optical network (PON) could potentially be raised by 100% with PNC.

Includes members:
  Member "an algebraic approach to physical layer network coding":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "lattice coding for downlink multiuser transmission")
  Member "eigen direction alignment based physical layer network coding for mimo two way relay channels":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "multiple input multiple output two way relaying a space division approach")
  Member "asynchronous physical layer network coding":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "an analysis of two user uplink asynchronous non orthogonal multiple access systems")
  Member "optimal decoding algorithm for asynchronous physical layer network coding":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "differential distributed space time coding with imperfect synchronization in frequency selective channels")
  Member "non memoryless analog network coding in two way relay channel":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "ldpc code design for noncoherent physical layer network coding")
  Member "reliable physical layer network coding":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "towards massive connectivity support for scalable mmtc communications in 5g networks")
  Member "blind known interference cancellation":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "optimal spectrum sharing with arq based legacy users via chain decoding")
  Member "wireless mimo switching with zero forcing relaying and network coded relaying":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "wireless mimo switching")

Question: Please tell me which class the source paper 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)