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: "outage probability of dual hop multiple antenna af systems with linear processing in the presence of co channel interference"
  Abstract: This paper considers a dual-hop amplify-and-forward (AF) relaying system where the relay is equipped with multiple antennas, while the source and the destination are equipped with a single antenna. Assuming that the relay is subjected to co-channel interference (CCI) and additive white Gaussian noise (AWGN) while the destination is corrupted by AWGN only, we propose three heuristic relay precoding schemes to combat the CCI, namely, 1) Maximum ratio combining/maximal ratio transmission (MRC/MRT), 2) Zero-forcing/MRT (ZF/MRT), 3) Minimum mean-square error/MRT (MMSE/MRT). We derive new exact outage expressions as well as simple high signal-to-noise ratio (SNR) outage approximations for all three schemes. Our findings suggest that both the MRC/MRT and the MMSE/MRT schemes achieve a full diversity of N, while the ZF/MRT scheme achieves a diversity order of N-M, where N is the number of relay antennas and M is the number of interferers. In addition, we show that the MMSE/MRT scheme always achieves the best outage performance, and the ZF/MRT scheme outperforms the MRC/MRT scheme in the low SNR regime, while becomes inferior to the MRC/MRT scheme in the high SNR regime. Finally, in the large N regime, we show that both the ZF/MRT and MMSE/MRT schemes are capable of completely eliminating the CCI, while perfect interference cancelation is not possible with the MRC/MRT scheme.

Connected through hyperedge HE-1 (induced by source paper "on the joint impact of hardware impairments and imperfect csi on successive decoding"):
  with members:
    - "on the mimo capacity with residual transceiver hardware impairments"
    - "performance analysis of the ordered v blast approach over nakagami m fading channels"
    - "exact joint distribution analysis of zero forcing v blast gains with greedy ordering"
    - "diversity of mmse mimo receivers"
    - "mimo transmission with residual transmit rf impairments"
    - "performance analysis of mimo mrc in double correlated rayleigh environments"

Connected through hyperedge HE-2 (induced by source paper "performance analysis and scaling law of mrc mrt relaying with csi error in massive mimo systems"):
  with members:
    - "massive mimo ten myths and one critical question"
    - "ergodic capacity comparison of different relay precoding schemes in dual hop af systems with co channel interference"
    - "multi pair amplify and forward relaying with very large antenna arrays"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "energy and spectral efficiency of very large multiuser mimo systems"

Connected through hyperedge HE-3 (induced by source paper "simultaneous spectrum sensing and data reception for cognitive spatial multiplexing distributed systems"):
  with members:
    - "solutions to integrals involving the marcum q function and applications"
    - "sensing for spectrum sharing in cognitive lte a cellular networks"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "effects of channel aging in massive mimo systems"

Connected through hyperedge HE-4 (induced by source paper "relay selection in wireless powered cooperative networks with energy storage"):
  with members:
    - "wireless powered communication opportunities and challenges"
    - "distributed power splitting for swipt in relay interference channels using game theory"
    - "harvest then cooperate wireless powered cooperative communications"
    - "simultaneous wireless information and power transfer in modern communication systems"
    - "energy beamforming with one bit feedback"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "full duplex wireless powered relay with self energy recycling"
    - "power allocation strategies in energy harvesting wireless cooperative networks"

Connected through hyperedge HE-5 (induced by source paper "wireless information and power transfer in relay systems with multiple antennas and interference"):
  with members:
    - "information and energy cooperation in cognitive radio networks"
    - "power allocation strategies in energy harvesting wireless cooperative networks"
    - "ergodic capacity comparison of different relay precoding schemes in dual hop af systems with co channel interference"
    - "secrecy wireless information and power transfer with miso beamforming"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "simultaneous information and energy transfer in large scale networks with without relaying"
    - "wireless information and energy transfer in multi antenna interference channel"
    - "outage probability of dual hop multiple antenna af relaying systems with interference"

Connected through hyperedge HE-6 (induced by source paper "ergodic capacity comparison of different relay precoding schemes in dual hop af systems with co channel interference"):
  with members:
    - "outage probability of dual hop multiple antenna af relaying systems with interference"
    - "a new formula for the ber of binary modulations with dual branch selection over generalized k"
    - "ergodic capacity analysis of amplify and forward mimo dual hop systems"
    - "mimo networks the effects of interference"

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)