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: "mitigating pilot contamination through location aware pilot assignment in massive mimo networks"
  Abstract: We propose a novel location-aware pilot assignment scheme to mitigate pilot contamination in massive multiple-input multiple-output (MIMO) networks, where the channels are subjected to Rician fading. Our proposed scheme utilizes the location information of users as the input to conduct pilot assignment in the network. Based on the location information, we first determine the line of sight (LOS) interference between the intended signal and the interfering signal. Our analysis reveals that the LOS interference converges to zero as the number of antennas at the base station (BS) goes to infinity, whereas for finite number of antennas at the BS the LOS interference indeed depends on specific pilot allocation strategies. Following this revelation, we assign pilot sequences to all the users in the massive MIMO network such that the LOS interference is minimized for finite number of antennas at the BS. Our proposed scheme outperforms the random pilot assignment in terms of achieving a much higher uplink sum rate for reasonable values of the Rician K-factor. Moreover, we propose a new performance metric, which measures the strength of the LOS interference and demonstrate that it is a good metric to analyze the performance of pilot assignment schemes. Theoretical analysis is provided and verified through numerical simulations to support the proposed scheme.

Connected through hyperedge HE-1 (induced by source paper "location aided pilot contamination avoidance for massive mimo systems"):
  with members:
    - "massive mimo has unlimited capacity"
    - "performance analysis of massive mimo for cell boundary users"
    - "spatially common sparsity based adaptive channel estimation and feedback for fdd massive mimo"
    - "pilot reuse for massive mimo transmission over spatially correlated rayleigh fading channels"
    - "smart pilot assignment for massive mimo"
    - "massive mimo for next generation wireless systems"
    - "optimizing multi cell massive mimo for spectral efficiency how many users should be scheduled"
    - "blind pilot decontamination"

Connected through hyperedge HE-2 (induced by source paper "single anchor two way localization bounds for 5g mmwave systems two protocols"):
  with members:
    - "error bounds for uplink and downlink 3d localization in 5g mmwave systems"
    - "position and orientation estimation through millimeter wave mimo in 5g systems"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "spatial wireless channel prediction under location uncertainty"
    - "low power analog to digital conversion in millimeter wave systems impact of resolution and bandwidth on performance"
    - "what will 5g be"
    - "fundamental limits of wideband localization part ii cooperative networks"
    - "fundamental limits of wideband localization part i a general framework"

Connected through hyperedge HE-3 (induced by source paper "location aware pilot allocation in multi cell multi user massive mimo networks"):
  with members:
    - "massive mimo with imperfect channel covariance information"
    - "cell free massive mimo versus small cells"
    - "multi cell multiuser massive mimo networks user capacity analysis and pilot design"
    - "smart pilot assignment for massive mimo"
    - "blind pilot decontamination"
    - "a coordinated approach to channel estimation in large scale multiple antenna systems"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-4 (induced by source paper "error bounds for uplink and downlink 3d localization in 5g mmwave systems"):
  with members:
    - "performance limits and geometric properties of array localization"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "spatial wireless channel prediction under location uncertainty"
    - "low power analog to digital conversion in millimeter wave systems impact of resolution and bandwidth on performance"
    - "evaluation of position related information in multipath components for indoor positioning"
    - "what will 5g be"
    - "millimeter wave channel modeling and cellular capacity evaluation"
    - "fundamental limits of wideband localization part ii cooperative networks"

Connected through hyperedge HE-5 (induced by source paper "active attack on user load achieving pilot design in massive mimo networks"):
  with members:
    - "user load analysis and pilot sequence design for multi cell massive mimo networks"
    - "multi cell multiuser massive mimo networks user capacity analysis and pilot design"
    - "massive mimo for next generation wireless systems"
    - "blind pilot decontamination"
    - "five disruptive technology directions for 5g"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "a coordinated approach to channel estimation in large scale multiple antenna systems"
    - "pilot contamination and precoding in multi cell tdd systems"

Connected through hyperedge HE-6 (induced by source paper "location aided pilot decontamination for massive mimo systems"):
  with members:
    - "massive mimo has unlimited capacity"
    - "adaptive pilot clustering in heterogeneous massive mimo networks"
    - "low rank covariance assisted downlink training and channel estimation for fdd massive mimo systems"
    - "performance analysis of massive mimo for cell boundary users"
    - "spatially common sparsity based adaptive channel estimation and feedback for fdd massive mimo"
    - "pilot reuse for massive mimo transmission over spatially correlated rayleigh fading channels"
    - "smart pilot assignment for massive mimo"
    - "massive mimo for next generation wireless systems"

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)