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: "ergodic capacity analysis of amplify and forward mimo dual hop systems"
  Abstract: This paper presents an analytical characterization of the ergodic capacity of amplify-and-forward (AF) MIMO dual-hop relay channels, assuming that the channel state information is available at the destination terminal only. In contrast to prior results, our expressions apply for arbitrary numbers of antennas and arbitrary relay configurations. We derive an expression for the exact ergodic capacity, simplified closed-form expressions for the high SNR regime, and tight closed-form upper and lower bounds. These results are made possible by employing recent tools from finite-dimensional random matrix theory, which are used to derive new closed-form expressions for various statistical properties of the equivalent AF MIMO dual-hop relay channel, such as the distribution of an unordered eigenvalue and certain random determinant properties. Based on the analytical capacity expressions, we investigate the impact of the system and channel characteristics, such as the antenna configuration and the relay power gain. We also demonstrate a number of interesting relationships between the dual-hop AF MIMO relay channel and conventional point-to-point MIMO channels in various asymptotic regimes.

Connected through hyperedge HE-1 (induced by source paper "dft based hybrid beamforming multiuser systems rate analysis and beam selection"):
  with members:
    - "performance analysis of mixed adc massive mimo systems over rician fading channels"
    - "hybrid analog digital precoding revisited under realistic rf modeling"
    - "on the number of rf chains and phase shifters and scheduling design with hybrid analog digital beamforming"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"
    - "performance analysis of massive mimo for cell boundary users"
    - "limited feedback hybrid precoding for multi user millimeter wave systems"
    - "uplink achievable rate for massive mimo systems with low resolution adc"
    - "millimeter wave mimo with lens antenna array a new path division multiplexing paradigm"

Connected through hyperedge HE-2 (induced by source paper "spectral and energy efficiency of multi pair massive mimo relay network with hybrid processing"):
  with members:
    - "secure massive mimo systems with limited rf chains"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "on the number of rf chains and phase shifters and scheduling design with hybrid analog digital beamforming"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"
    - "near optimal hybrid processing for massive mimo systems via matrix decomposition"
    - "hybrid block diagonalization for massive multiuser mimo systems"
    - "multipair full duplex relaying with massive arrays and linear processing"

Connected through hyperedge HE-3 (induced by source paper "numerically stable evaluation of moments of random gram matrices with applications"):
  with members:
    - "analytical derivation of the inverse moments of one sided correlated gram matrices with applications"

Connected through hyperedge HE-4 (induced by source paper "asymptotic performance analysis of a k hop amplify and forward relay mimo channel"):
  with members:
    - "asymptotic analysis of su mimo channels with transmitter noise and mismatched joint decoding"
    - "large system analysis of correlated mimo multiple access channels with arbitrary signaling in the presence of interference"
    - "asymptotic capacity and optimal precoding in mimo multi hop relay networks"
    - "a typical reconstruction limit of compressed sensing based on lp norm minimization"
    - "tight bounds on the capacity of binary input random cdma systems"
    - "asymptotic analysis of general multiuser detectors in mimo ds cdma channels"
    - "vector precoding for wireless mimo systems and its replica analysis"
    - "asymptotic mutual information statistics of separately correlated rician fading mimo channels"

Connected through hyperedge HE-5 (induced by source paper "on the spectral efficiency of space constrained massive mimo with linear receivers"):
  with members:
    - "on the spectral efficiency of massive mimo systems with low resolution adcs"
    - "achievable rate of rician large scale mimo channels with transceiver hardware impairments"
    - "space constrained massive mimo hitting the wall of favorable propagation"
    - "the impact of physical channel on performance of subspace based channel estimation in massive mimo systems"
    - "massive mimo with non ideal arbitrary arrays hardware scaling laws and circuit aware design"
    - "power scaling of uplink massive mimo systems with arbitrary rank channel means"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"

Connected through hyperedge HE-6 (induced by source paper "multi user massive mimo communication systems based on irregular antenna arrays"):
  with members:
    - "spatial spectrum and energy efficiency of random cellular networks"
    - "5g ultra dense cellular networks"
    - "5g wireless backhaul networks challenges and research advances"
    - "impact of transceiver power consumption on the energy efficiency of zero forcing detector in massive mimo systems"
    - "two tier precoding for fdd multi cell massive mimo time varying interference networks"
    - "five disruptive technology directions for 5g"
    - "closed loop beam alignment for massive mimo channel estimation"
    - "energy and spectral efficiency of very large multiuser mimo systems"

Connected through hyperedge HE-7 (induced by source paper "a scalable architecture for distributed receive beamforming analysis and experimental demonstration"):
  with members:
    - "opportunistic collaborative beamforming with one bit feedback"
    - "network beamforming using relays with perfect channel information"
    - "asymptotic analysis of amplify and forward relaying in a parallel mimo relay network"
    - "distributed transmit beamforming using feedback control"

Connected through hyperedge HE-8 (induced by source paper "the role of large scale fading in uplink massive mimo systems"):
  with members:
    - "on capacity of large scale mimo multiple access channels with distributed sets of correlated antennas"
    - "energy and spectral efficiency of very large multiuser mimo 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)