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: "phased mimo radar a tradeoff between phased array and mimo radars"
  Abstract: We propose a new technique for multiple-input multiple-output (MIMO) radar with colocated antennas which we call phased-MIMO radar. The new technique enjoys the advantages of the MIMO radar without sacrificing the main advantage of the phased-array radar which is the coherent processing gain at the transmitting side. The essence of the proposed technique is to partition the transmit array into a number of subarrays that are allowed to overlap. Then, each subarray is used to coherently transmit a waveform which is orthogonal to the waveforms transmitted by other subarrays. Coherent processing gain can be achieved by designing a weight vector for each subarray to form a beam towards a certain direction in space. Moreover, the subarrays are combined jointly to form a MIMO radar resulting in higher angular resolution capabilities. Substantial improvements offered by the proposed phased-MIMO radar technique as compared to the phased-array and MIMO radar techniques are demonstrated analytically and by simulations through analyzing the corresponding beam patterns and the achievable output signal-to-noise-plus-interference ratios. Both analytical and simulation results validate the effectiveness of the proposed phased-MIMO radar.

Connected through hyperedge HE-1 (induced by source paper "fast algorithms for designing unimodular waveform s with good correlation properties"):
  with members:
    - "ambiguity function of the transmit beamspace based mimo radar"
    - "sum rate maximization in two way af mimo relaying polynomial time solutions to a class of dc programming problems"

Connected through hyperedge HE-2 (induced by source paper "single anchor localization and orientation performance limits using massive arrays mimo vs beamforming"):
  with members:
    - "direct localization for massive mimo"
    - "error bounds for uplink and downlink 3d localization in 5g mmwave systems"
    - "performance limits and geometric properties of array localization"
    - "map aware models for indoor wireless localization systems an experimental study"
    - "channel estimation and hybrid precoding for millimeter wave cellular systems"
    - "massive mimo for next generation wireless systems"
    - "emerging technologies and research challenges for 5g wireless networks"
    - "scaling up mimo opportunities and challenges with very large arrays"

Connected through hyperedge HE-3 (induced by source paper "transmit array interpolation for doa estimation via tensor decomposition in 2 d mimo radar"):
  with members:
    - "transmit radiation pattern invariance in mimo radar with application to doa estimation"
    - "efficient transmit beamspace design for search free based doa estimation in mimo radar"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"

Connected through hyperedge HE-4 (induced by source paper "an algebraic approach to a class of rank constrained semi definite programs with applications"):
  with members:
    - "discrete signal processing on graphs frequency analysis"
    - "the emerging field of signal processing on graphs extending high dimensional data analysis to networks and other irregular domains"
    - "discrete signal processing on graphs"
    - "the algebraic combinatorial approach for low rank matrix completion"
    - "phase retrieval via matrix completion"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"
    - "interference alignment as a rank constrained rank minimization"

Connected through hyperedge HE-5 (induced by source paper "joint robust transmit receive adaptive beamforming for mimo radar using probability constrained optimization"):
  with members:
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"

Connected through hyperedge HE-6 (induced by source paper "ambiguity function of the transmit beamspace based mimo radar"):
  with members:
    - "spatial compressive sensing for mimo radar"
    - "efficient transmit beamspace design for search free based doa estimation in mimo radar"
    - "moving target parameters estimation in noncoherent mimo radar systems"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"
    - "optimal joint target detection and parameter estimation by mimo radar"
    - "mimo radar using compressive sampling"
    - "diversity integration tradeoffs in mimo detection"

Connected through hyperedge HE-7 (induced by source paper "transmit radiation pattern invariance in mimo radar with application to doa estimation"):
  with members:
    - "efficient transmit beamspace design for search free based doa estimation in mimo radar"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"

Connected through hyperedge HE-8 (induced by source paper "efficient transmit beamspace design for search free based doa estimation in mimo radar"):
  with members:
    - "moving target parameters estimation in noncoherent mimo radar systems"
    - "transmit energy focusing for doa estimation in mimo radar with colocated antennas"
    - "diversity integration tradeoffs in mimo detection"

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)