human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "random pilot and data access in massive mimo for machine type communications"):
  Abstract: A massive MIMO system, represented by a base station with hundreds of antennas, is capable of spatially multiplexing many devices and thus naturally suited to serve dense crowds of wireless devices in emerging applications, such as machine-type communications. Crowd scenarios pose new challenges in the pilot-based acquisition of channel state information and call for pilot access protocols that match the intermittent pattern of device activity. A joint pilot assignment and data transmission protocol based on random access is proposed in this paper for the uplink of a massive MIMO system. The protocol relies on the averaging across multiple transmission slots of the pilot collision events that result from the random access process. We derive new uplink sum rate expressions that take pilot collisions, intermittent device activity, and interference into account. Simplified bounds are obtained and used to optimize the device activation probability and pilot length. A performance analysis indicates how performance scales as a function of the number of antennas and the transmission slot duration.

Includes members:
  Member "a random access protocol for pilot allocation in crowded massive mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "massive mimo asymptotics for ray based propagation channels")
  Member "random access in uplink massive mimo systems how to exploit asynchronicity and excess antennas":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "timing advance estimation and beamforming of random access response in crowded tdd massive mimo systems")
  Member "coded pilot access a random access solution for massive mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "towards massive connectivity support for scalable mmtc communications in 5g networks")
  Member "massive mimo ten myths and one critical question":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "deep learning for massive mimo channel state acquisition and feedback")
  Member "random access for massive mimo systems with intra cell pilot contamination":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "efficient pilot allocation for urllc traffic in 5g industrial iot networks")
  Member "towards very large aperture massive mimo a measurement based study":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "computation offloading for iot in c ran optimization and deep learning")
  Member "random access protocol for massive mimo strongest user collision resolution sucr":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "efficient pilot allocation for urllc traffic in 5g industrial iot networks")
  Member "massive mimo for crowd scenarios a solution based on random access":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "efficient pilot allocation for urllc traffic in 5g industrial iot networks")

Question: Please tell me which class the source paper 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)