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: "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. A second important issue is how to integrate channel coding with PNC to achieve reliable communication. This paper investigates these two issues and makes the following contributions: 1) We propose and investigate a general framework for decoding at the receiver based on belief propagation (BP). The framework can effectively deal with symbol and phase asynchronies while incorporating channel coding at the same time. 2) For unchannel-coded PNC, we show that for BPSK and QPSK modulations, our BP method can significantly reduce the asynchrony penalties compared with prior methods. 3) For QPSK unchannel-coded PNC, with a half symbol offset between the transmitters, our BP method can drastically reduce the performance penalty due to phase asynchrony, from more than 6 dB to no more than 1 dB. 4) For channel-coded PNC, with our BP method, both symbol and phase asynchronies actually improve the system performance compared with the perfectly synchronous case. Furthermore, the performance spread due to different combinations of symbol and phase offsets between the transmitters in channel-coded PNC is only around 1 dB. The implication of 3) is that if we could control the symbol arrival times at the receiver, it would be advantageous to deliberately introduce a half symbol offset in unchannel-coded PNC. The implication of 4) is that when channel coding is used, symbol and phase asynchronies are not major performance concerns in PNC.

Connected through hyperedge HE-1 (induced by source paper "an analysis of two user uplink asynchronous non orthogonal multiple access systems"):
  with members:
    - "downlink non orthogonal multiple access with limited feedback"
    - "a survey on non orthogonal multiple access for 5g networks research challenges and future trends"
    - "asynchronous physical layer network coding symbol misalignment estimation and its effect on decoding"
    - "interference mitigation using asynchronous transmission and sampling diversity"
    - "differential distributed space time coding with imperfect synchronization in frequency selective channels"
    - "asynchronous orthogonal differential decoding for multiple access channels"

Connected through hyperedge HE-2 (induced by source paper "noncoherent detection for physical layer network coding"):
  with members:
    - "asynchronous physical layer network coding symbol misalignment estimation and its effect on decoding"
    - "on the subtleties of q pam linear physical layer network coding"
    - "network coded multiple access with high order modulations"
    - "physical layer network coding tutorial survey and beyond"
    - "compute and forward harnessing interference through structured codes"
    - "physical network coding in two way wireless relay channels"

Connected through hyperedge HE-3 (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"
    - "implementation of physical layer network coding"
    - "physical layer network coding"

Connected through hyperedge HE-4 (induced by source paper "physical layer network coding a random coding error exponent perspective"):
  with members:
    - "code design for short blocks a survey"
    - "towards massive ultra reliable and low latency wireless the art of sending short packets"
    - "asynchronous physical layer network coding with quasi cyclic codes"
    - "mismatched decoding error exponents second order rates and saddlepoint approximations"
    - "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"

Connected through hyperedge HE-5 (induced by source paper "asynchronous physical layer network coding symbol misalignment estimation and its effect on decoding"):
  with members:
    - "joint ldpc and physical layer network coding for asynchronous bi directional relaying"
    - "reliable physical layer network coding"
    - "physical layer network coding tutorial survey and beyond"

Connected through hyperedge HE-6 (induced by source paper "on the subtleties of q pam linear physical layer network coding"):
  with members:
    - "multilevel coding schemes for compute and forward with flexible decoding"
    - "symbol and bit mapping optimization for physical layer network coding with pulse amplitude modulation"
    - "an algebraic approach to physical layer network coding"
    - "multiple input multiple output two way relaying a space division approach"
    - "reliable physical layer network coding"
    - "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-7 (induced by source paper "physical layer network coding in two way heterogeneous cellular networks with power imbalance"):
  with members:
    - "what will 5g be"
    - "network coded multiple access"
    - "physical layer network coding tutorial survey and beyond"
    - "implementation of physical layer network coding"

Connected through hyperedge HE-8 (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"
    - "reliable physical layer network coding"
    - "physical layer network coding tutorial survey and beyond"

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)