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: "optimum co design for spectrum sharing between matrix completion based mimo radars and a mimo communication system"
  Abstract: Spectrum sharing enables radar and communication systems to share the spectrum efficiently by minimizing mutual interference. Recently proposed multiple-input multiple-output radars based on sparse sensing and matrix completion (MIMO-MC), in addition to reducing communication bandwidth and power as compared with MIMO radars, offer a significant advantage for spectrum sharing. The advantage stems from the way the sampling scheme at the radar receivers modulates the interference channel from the communication system transmitters, rendering it symbol dependent and reducing its row space. This makes it easier for the communication system to design its waveforms in an adaptive fashion so that it minimizes the interference to the radar subject to meeting rate and power constraints. Two methods are proposed. First, based on the knowledge of the radar sampling scheme, the communication system transmit covariance matrix is designed to minimize the effective interference power (EIP) at the radar receiver, while maintaining certain average capacity and transmit power for the communication system. Second, a joint design of the communication transmit covariance matrix and the MIMO-MC radar sampling scheme is proposed, which achieves even further EIP reduction.

Connected through hyperedge HE-1 (induced by source paper "interference removal for radar communication co existence the random scattering case"):
  with members:
    - "on the global geometry of sphere constrained sparse blind deconvolution"
    - "adaptive interference removal for uncoordinated radar communication coexistence"
    - "atomic norm minimization for modal analysis from random and compressed samples"
    - "recovery of structured signals with prior information via maximizing correlation"
    - "joint design of overlaid communication systems and pulsed radars"
    - "guaranteed blind sparse spikes deconvolution via lifting and convex optimization"
    - "spectrum sharing between a surveillance radar and secondary wi fi networks"
    - "super resolution of complex exponentials from modulations with unknown waveforms"

Connected through hyperedge HE-2 (induced by source paper "analysis of worst case interference in underlay radar massive mimo spectrum sharing scenarios"):
  with members:
    - "optimal base station antenna downtilt in downlink cellular networks"
    - "robust mimo beamforming for cellular and radar coexistence"
    - "coexistence of outdoor wi fi and radar at 3 5 ghz"
    - "spectrum sharing between a surveillance radar and secondary wi fi networks"
    - "modeling and analyzing the coexistence of wi fi and lte in unlicensed spectrum"

Connected through hyperedge HE-3 (induced by source paper "communications and radar coexistence in the massive mimo regime uplink analysis"):
  with members:
    - "adaptive interference removal for uncoordinated radar communication coexistence"
    - "co existence between a radar system and a massive mimo wireless cellular system"
    - "on the ergodic rate lower bounds with applications to massive mimo"
    - "spectrum sharing radar coexistence via xampling"

Connected through hyperedge HE-4 (induced by source paper "adaptive interference removal for uncoordinated radar communication coexistence"):
  with members:
    - "joint design of overlaid communication systems and pulsed radars"
    - "complete dictionary recovery over the sphere i overview and the geometric picture"
    - "spectrum sharing between a surveillance radar and secondary wi fi networks"
    - "super resolution of complex exponentials from modulations with unknown waveforms"
    - "robust spectral compressed sensing via structured matrix completion"
    - "exact joint sparse frequency recovery via optimization methods"
    - "direction of arrival estimation using co prime arrays a super resolution viewpoint"
    - "atomic norm denoising with applications to line spectral estimation"

Connected through hyperedge HE-5 (induced by source paper "toward dual functional radar communication systems optimal waveform design"):
  with members:
    - "adaptive interference removal for uncoordinated radar communication coexistence"
    - "joint design of overlaid communication systems and pulsed radars"
    - "mu mimo communications with mimo radar from co existence to joint transmission"
    - "robust mimo beamforming for cellular and radar coexistence"
    - "interference exploitation for radar and cellular coexistence the power efficient approach"
    - "an efficient global algorithm for single group multicast beamforming"
    - "an efficient manifold algorithm for constructive interference based constant envelope precoding"
    - "riemannian dictionary learning and sparse coding for positive definite matrices"

Connected through hyperedge HE-6 (induced by source paper "performance tradeoff in a unified system of communications and passive radar a secrecy capacity approach"):
  with members:
    - "throughput analysis and optimization of wireless powered multiple antenna full duplex relay systems"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "joint design of overlaid communication systems and pulsed radars"):
  with members:
    - "spectrum sharing between a surveillance radar and secondary wi fi networks"
    - "a coordinated approach to channel estimation in large scale multiple antenna systems"

Connected through hyperedge HE-8 (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"
    - "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"
    - "on the impact of time varying interference channel on the spatial approach of spectrum sharing between s band radar and communication system"

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)