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: "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"
  Abstract: Spectrum sharing is a new approach to solve the congestion problem in RF spectrum. A spatial approach for spectrum sharing between radar and communication system was proposed, which mitigates the radar interference to communication by projecting the radar waveform onto null space of interference channel, between radar and communication system [1]. In this work, we extend this approach to maritime MIMO radar which experiences time varying interference channel due to the oscillatory motion of ship, because of the breaking of sea/ocean waves. We model this variation by using the matrix perturbation theory and the statistical distribution of the breaking waves. This model is then used to study the impact of perturbed interference channel on the spatial approach of spectrum sharing. We use the maximum likelihood (ML) estimate of target's angle of arrival to study the radar's performance when its waveform is projected onto the null space of the perturbed interference channel. Through our analytical and simulation results, we study the loss in the radar's performance due to the null space projection (NSP) of its waveform on the perturbed interference channel.

Connected through hyperedge HE-1 (induced by source paper "interference exploitation for radar and cellular coexistence the power efficient approach"):
  with members:
    - "robust mimo beamforming for cellular and radar coexistence"
    - "coexistence analysis between radar and cellular system in los channel"
    - "optimum co design for spectrum sharing between matrix completion based mimo radars and a mimo communication system"
    - "constructive interference through symbol level precoding for multi level modulation"
    - "exploiting known interference as green signal power for downlink beamforming optimization"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "cooperative radar and communications signaling the estimation and information theory odd couple"

Connected through hyperedge HE-2 (induced by source paper "coexistence analysis between radar and cellular system in los channel"):
  with members:
    - "separation of signals consisting of amplitude and instantaneous frequency rrc pulses using snr uniform training"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "radar precoder design for spectral coexistence with coordinated multi point comp system"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"

Connected through hyperedge HE-3 (induced by source paper "network mimo with partial cooperation between radar and cellular systems"):
  with members:
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "linear precoding and equalization for network mimo with partial cooperation"
    - "networked mimo with clustered linear precoding"

Connected through hyperedge HE-4 (induced by source paper "3d channel modeling between seaborne mimo radar and mimo cellular system"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"
    - "preliminary results on 3d channel modeling from theory to standardization"

Connected through hyperedge HE-5 (induced by source paper "target detection performance of spectrum sharing mimo radars"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "3d channel modeling between seaborne mimo radar and mimo cellular system"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "radar precoder design for spectral coexistence with coordinated multi point comp system"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"

Connected through hyperedge HE-6 (induced by source paper "three dimensional 3d channel modeling between seaborne mimo radar and mimo cellular system"):
  with members:
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "overlapped mimo radar waveform design for coexistence with communication systems"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"
    - "preliminary results on 3d channel modeling from theory to standardization"

Connected through hyperedge HE-7 (induced by source paper "qpsk waveform for mimo radar with spectrum sharing constraints"):
  with members:
    - "coexistence analysis between radar and cellular system in los channel"
    - "3d channel modeling between seaborne mimo radar and mimo cellular system"
    - "target detection performance of spectrum sharing mimo radars"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"

Connected through hyperedge HE-8 (induced by source paper "radar precoder design for spectral coexistence with coordinated multi point comp system"):
  with members:
    - "qpsk waveform for mimo radar with spectrum sharing constraints"
    - "target detection performance of spectrum sharing mimo radars"
    - "a utility proportional fairness resource allocation in spectrally radar coexistent cellular networks"

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)