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: "backscatter multiplicative multiple access systems fundamental limits and practical design"
  Abstract: In this paper, we consider a novel ambient backscatter multiple-access system, where a receiver (Rx) simultaneously detects the signals transmitted from an active transmitter (Tx) and a backscatter Tag. Specifically, the information-carrying signal sent by the Tx arrives at the Rx through two wireless channels: the direct channel from the Tx to the Rx, and the backscatter channel from the Tx to the Tag and then to the Rx. The received signal from the backscatter channel also carries the Tag's information because of the multiplicative backscatter operation at the Tag. This multiple-access system introduces a new channel model, referred to as multiplicative multiple-access channel (M-MAC). We analyze the achievable rate region of the M-MAC, and prove that its region is strictly larger than that of the conventional time-division multiple-access scheme in many cases, including, e.g., the high SNR regime and the case when the direct channel is much stronger than the backscatter channel. Hence, the multiplicative multiple-access scheme is an attractive technique to improve the throughput for ambient backscatter communication systems. Moreover, we analyze the detection error rates for coherent and noncoherent modulation schemes adopted by the Tx and the Tag, respectively, in both synchronous and asynchronous scenarios, which further bring interesting insights for practical system design.

Connected through hyperedge HE-1 (induced by source paper "coverage probability analysis under clustered ambient backscatter nodes"):
  with members:
    - "throughput maximization for ambient backscatter communication a reinforcement learning approach"
    - "cooperative ambient backscatter communications for green internet of things"
    - "traffic aware backscatter communications in wireless powered heterogeneous networks"
    - "3gpp inspired hetnet model using poisson cluster process sum product functionals and downlink coverage"
    - "wirelessly powered backscatter communications waveform design and snr energy tradeoff"
    - "backscatter communications for wireless powered sensor networks with collision resolution"
    - "ambient backscatter communications a contemporary survey"
    - "nearest neighbor and contact distance distributions for thomas cluster process"

Connected through hyperedge HE-2 (induced by source paper "multi tag backscattering to mimo reader channel estimation and throughput fairness"):
  with members:
    - "sum throughput maximization in multi tag backscattering to multiantenna reader"
    - "optimal channel estimation for reciprocity based backscattering with a full duplex mimo reader"
    - "multiuser wirelessly powered backscatter communications nonlinearity waveform design and sinr energy tradeoff"
    - "retrodirective large antenna energy beamforming in backscatter multi user networks"
    - "inference from randomized transmissions by many backscatter sensors"
    - "ambient backscatter communications a contemporary survey"
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "multi antenna wireless energy transfer for backscatter communication systems"

Connected through hyperedge HE-3 (induced by source paper "hybrid beamformer design for high dynamic range ambient backscatter receivers"):
  with members:
    - "fm backscatter enabling connected cities and smart fabrics"
    - "modulation in the air backscatter communication over ambient ofdm carrier"
    - "full duplex backscatter interference networks based on time hopping spread spectrum"

Connected through hyperedge HE-4 (induced by source paper "optimal resource allocation in full duplex ambient backscatter communication networks for wireless powered iot"):
  with members:
    - "cooperative ambient backscatter communications for green internet of things"
    - "riding on the primary a new spectrum sharing paradigm for wireless powered iot devices"
    - "wireless powered asynchronous backscatter networks with sporadic short packets performance analysis and optimization"
    - "lora backscatter enabling the vision of ubiquitous connectivity"
    - "fm backscatter enabling connected cities and smart fabrics"
    - "modulation in the air backscatter communication over ambient ofdm carrier"
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "multi antenna wireless energy transfer for backscatter communication systems"

Connected through hyperedge HE-5 (induced by source paper "ambient backscatter communications a contemporary survey"):
  with members:
    - "cooperative ambient backscatter communications for green internet of things"
    - "pixelated vlc backscattering for self charging indoor iot devices"
    - "wirelessly powered backscatter communications waveform design and snr energy tradeoff"
    - "lora backscatter enabling the vision of ubiquitous connectivity"
    - "backscatter communications for internet of things theory and applications"
    - "ambient backscatter networking a novel paradigm to assist wireless powered communications"
    - "scatter radio receivers for extended range environmental sensing wsns"
    - "fm backscatter enabling connected cities and smart fabrics"

Connected through hyperedge HE-6 (induced by source paper "backscatter communications for internet of things theory and applications"):
  with members:
    - "ambient backscatter communications a contemporary survey"
    - "waveform design for wireless power transfer"
    - "full duplex backscatter interference networks based on time hopping spread spectrum"
    - "inter technology backscatter towards internet connectivity for implanted devices"
    - "wireless communications with unmanned aerial vehicles opportunities and challenges"
    - "multi antenna wireless energy transfer for backscatter communication systems"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-7 (induced by source paper "next generation backscatter communication systems techniques and applications"):
  with members:
    - "ambient backscatter communications a contemporary survey"
    - "waveform design for wireless power transfer"
    - "full duplex backscatter interference networks based on time hopping spread spectrum"
    - "inter technology backscatter towards internet connectivity for implanted devices"
    - "wireless communications with unmanned aerial vehicles opportunities and challenges"
    - "multi antenna wireless energy transfer for backscatter communication systems"
    - "in band full duplex wireless challenges and opportunities"

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)