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 "the effect of spatial correlation on the performance of uplink and downlink single carrier massive mimo systems"):
  Abstract: We present the analysis of a single-carrier massive MIMO system for the frequency selective Gaussian multi-user channel, in both uplink and downlink directions. We develop expressions for the achievable sum-rate when there is spatial correlation among antennas at the base station. We show that although the Channel Matched Filter Precoder (CMFP) performs the best in a spatially uncorrelated downlink channel, in a spatially correlated channel, CMFP does not perform as expected. We suggest better precoding schemes which lead to a better achievable sum-rate. Considering the same groups of users and antennas, we develop a model for the uplink channel. Using two equalizer structures, we show the results of system performance in terms of achievable rate at the base station.

Includes members:
  Member "average sep optimal precoding for correlated massive mimo with zf detection an asymptotic analysis":
    also connected through other hyperedges:
      (none)
  Member "uplink massive mimo for channels with spatial correlation":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "large scale fading precoding for maximizing the product of sinrs")
  Member "waveforms for the massive mimo downlink amplifier efficiency distortion and performance":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "quantized constant envelope precoding with psk and qam signaling")
  Member "mimo channel modeling and capacity analysis for 5g millimeter wave wireless systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "fast harq over finite blocklength codes a technique for low latency reliable communication")
  Member "pilot reuse for massive mimo transmission over spatially correlated rayleigh fading channels":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "energy efficiency optimization for downlink massive mimo with statistical csit")
  Member "massive mimo for next generation wireless systems":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "joint power control and lsfd for wireless powered cell free massive mimo")
  Member "scaling up mimo opportunities and challenges with very large arrays":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "downlink secrecy rate of one bit massive mimo system with active eavesdropping")
  Member "diversity of mimo linear precoding":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "downlink macro diversity precoding aided spatial modulation")

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)