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: "multiple input multiple output two way relaying a space division approach"
  Abstract: We propose a novel space-division based network-coding scheme for multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), in which two multi-antenna users exchange information via a multi-antenna relay. In the proposed scheme, the overall signal space at the relay is divided into two subspaces. In one subspace, the spatial streams of the two users have nearly orthogonal directions, and are completely decoded at the relay. In the other subspace, the signal directions of the two users are nearly parallel, and linear functions of the spatial streams are computed at the relay, following the principle of physical-layer network coding (PNC). Based on the recovered messages and message-functions, the relay generates and forwards network-coded messages to the two users. We show that, at high signal-to-noise ratio (SNR), the proposed scheme achieves the asymptotic sum rate capacity of MIMO TWRCs within 1/2log(5/4) = 0.161 bits per user-antenna for any antenna configuration and channel realization. We perform large-system analysis to derive the average sum-rate of the proposed scheme over Rayleigh-fading MIMO TWRCs. We show that the average asymptotic sum rate gap to the capacity upper bound is at most 0.053 bits per relay-antenna. It is demonstrated that the proposed scheme significantly outperforms the existing schemes.

Connected through hyperedge HE-1 (induced by source paper "passive beamforming and information transfer design for reconfigurable intelligent surfaces aided multiuser mimo systems"):
  with members:
    - "cascaded channel estimation for large intelligent metasurface assisted massive mimo"
    - "passive beamforming and information transfer via large intelligent surface"
    - "smart radio environments empowered by ai reconfigurable meta surfaces an idea whose time has come"
    - "enabling large intelligent surfaces with compressive sensing and deep learning"
    - "towards smart and reconfigurable environment intelligent reflecting surface aided wireless network"
    - "intelligent reflecting surface enhanced wireless network via joint active and passive beamforming"
    - "beyond massive mimo the potential of data transmission with large intelligent surfaces"
    - "reconfigurable intelligent surfaces for energy efficiency in wireless communication"

Connected through hyperedge HE-2 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"

Connected through hyperedge HE-3 (induced by source paper "on the degrees of freedom of the symmetric multi relay mimo y channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"

Connected through hyperedge HE-4 (induced by source paper "compute compress and forward exploiting asymmetry of wireless relay networks"):
  with members:
    - "asymmetric compute and forward with csit"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "towards the asymptotic sum capacity of the mimo cellular two way relay channel"
    - "phase precoded compute and forward with partial feedback"
    - "phase precoding for the compute and forward protocol"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "multilevel coding schemes for compute and forward with flexible decoding"
    - "degrees of freedom for the mimo multi way relay channel"

Connected through hyperedge HE-5 (induced by source paper "multipair two way relay network with harvest then transmit users resolving pairwise uplink downlink coupling"):
  with members:
    - "rank two beamforming and power allocation in multicasting relay networks"
    - "on the efficiency of far field wireless power transfer"
    - "joint beamforming optimization and power control for full duplex mimo two way relay channel"
    - "spatial domain simultaneous information and power transfer for mimo channels"
    - "joint transceiver and power splitter design over two way relaying channel with lattice codes and energy harvesting"
    - "secure and green swipt in distributed antenna networks with limited backhaul capacity"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "beamforming for miso interference channels with qos and rf energy transfer"

Connected through hyperedge HE-6 (induced by source paper "on the subtleties of q pam linear physical layer network coding"):
  with members:
    - "multilevel coding schemes for compute and forward with flexible decoding"
    - "symbol and bit mapping optimization for physical layer network coding with pulse amplitude modulation"
    - "an algebraic approach to physical layer network coding"
    - "asynchronous physical layer network coding"
    - "reliable physical layer network coding"
    - "physical layer network coding tutorial survey and beyond"
    - "implementation of physical layer network coding"
    - "channel coding and decoding in a relay system operated with physical layer network coding"

Connected through hyperedge HE-7 (induced by source paper "mimo multiway distributed relay channel with full data exchange an achievable rate perspective"):
  with members:
    - "degrees of freedom of the symmetric multi relay mimo y channel"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "generalized signal alignment for mimo two way x relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "towards the asymptotic sum capacity of the mimo cellular two way relay channel"
    - "degrees of freedom for the mimo multi way relay channel"
    - "a simple proof for the existence of good pairs of nested lattices"
    - "spectrum sharing with distributed relay selection and clustering"

Connected through hyperedge HE-8 (induced by source paper "the dirty mimo multiple access channel"):
  with members:
    - "joint unitary triangularization for gaussian multi user mimo networks"
    - "joint unitary triangularization for mimo networks"
    - "physical layer mimo relaying"
    - "lattice strategies for the dirty multiple access channel"

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)