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: "full duplex relaying in mimo ofdm frequency selective channels with optimal adaptive filtering"
  Abstract: In-band full-duplex transmission allows a relay station to theoretically double its spectral efficiency by simultaneously receiving and transmitting in the same frequency band, when compared to the traditional half-duplex or out-of-band full-duplex counterpart. Consequently, the induced self-interference suffered by the relay may reach considerable power levels, which decreases the signal-to-interference-plus-noise ratio (SINR) in a decode-and-forward (DF) relay, leading to a degradation of the relay performance. This paper presents a technique to cope with the problem of self-interference in broadband multiple-input multiple-output (MIMO) relays. The proposed method uses a time-domain cancellation in a DF relay, where a replica of the interfering signal is created with the help of a recursive least squares (RLS) algorithm that estimates the interference frequency-selective channel. Its convergence mean time is shown to be negligible by simulation results, when compared to the length of a typical orthogonal-frequency division multiplexing (OFDM) sequences. Moreover, the bit-error-rate (BER) and the SINR in a OFDM transmission are evaluated, confirming that the proposed method extends significantly the range of self-interference power to which the relay is resilient to, when compared with other mitigation schemes.

Connected through hyperedge HE-1 (induced by source paper "state space adaptive nonlinear self interference cancellation for full duplex communication"):
  with members:
    - "simultaneous transmit and receive operation in next generation ieee 802 11 wlans a mac protocol design approach"
    - "multi tap digital canceller for full duplex applications"
    - "accumulate and jam towards secure communication via a wireless powered full duplex jammer"
    - "wideband self adaptive rf cancellation circuit for full duplex radio operating principle and measurements"
    - "all digital self interference cancellation technique for full duplex systems"
    - "passive self interference suppression for full duplex infrastructure nodes"
    - "widely linear digital self interference cancellation in direct conversion full duplex transceiver"
    - "design and characterization of a full duplex multiantenna system for wifi networks"

Connected through hyperedge HE-2 (induced by source paper "multipair massive mimo relaying with pilot data transmission overlay"):
  with members:
    - "energy efficient power control a look at 5g wireless technologies"
    - "massive mimo ten myths and one critical question"
    - "massive mimo full duplex relaying with optimal power allocation for independent multipairs"
    - "power allocation for multi pair massive mimo two way af relaying with linear processing"
    - "pilot reuse for massive mimo transmission over spatially correlated rayleigh fading channels"
    - "multipair full duplex relaying with massive arrays and linear processing"
    - "massive mimo for next generation wireless systems"
    - "emerging technologies and research challenges for 5g wireless networks"

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)