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: "transceiver design for multi user multi antenna two way relay cellular systems"
  Abstract: In this paper, we design interference free transceivers for multi-user two-way relay systems, where a multi-antenna base station (BS) simultaneously exchanges information with multiple single-antenna users via a multi-antenna amplify-and-forward relay station (RS). To offer a performance benchmark and provide useful insight into the transceiver structure, we employ alternating optimization to find optimal transceivers at the BS and RS that maximizes the bidirectional sum rate. We then propose a low complexity scheme, where the BS transceiver is the zero-forcing precoder and detector, and the RS transceiver is designed to balance the uplink and downlink sum rates. Simulation results demonstrate that the proposed scheme is superior to the existing zero forcing and signal alignment schemes, and the performance gap between the proposed scheme and the alternating optimization is minor.

Connected through hyperedge HE-1 (induced by source paper "towards the asymptotic sum capacity of the mimo cellular two way relay channel"):
  with members:
    - "application of analog network coding to mimo two way relay channel in cellular systems"
    - "beamforming design for multiuser two way relaying a unified approach via max min sinr"
    - "cellular multiuser two way mimo af relaying via signal space alignment minimum weighted sinr maximization"
    - "multiple input multiple output two way relaying a space division approach"
    - "compute and forward harnessing interference through structured codes"
    - "mapel achieving global optimality for a non convex wireless power control problem"
    - "physical network coding in two way wireless relay channels"

Connected through hyperedge HE-2 (induced by source paper "spectral efficiency of the cellular two way relaying with large antenna arrays"):
  with members:
    - "multipair full duplex relaying with massive arrays and linear processing"
    - "towards the asymptotic sum capacity of the mimo cellular two way relay channel"
    - "multi pair amplify and forward relaying with very large antenna arrays"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "cellular multiuser two way mimo af relaying via signal space alignment minimum weighted sinr maximization"
    - "energy and spectral efficiency of very large multiuser mimo systems"

Connected through hyperedge HE-3 (induced by source paper "a non alternating algorithm for joint bs rs precoding design in two way relay systems"):
  with members:
    - "linear precoding designs for amplify and forward multiuser two way relay systems"

Connected through hyperedge HE-4 (induced by source paper "wireless mimo switching"):
  with members:
    - "joint source and relay precoding designs for mimo two way relaying based on mse criterion"
    - "on the equal rate capacity of the awgn multiway relay channel"
    - "the capacity region of multiway relay channels over finite fields with full data exchange"
    - "wireless mimo switching with zero forcing relaying and network coded relaying"
    - "physical layer network coding tutorial survey and beyond"
    - "the multi way relay channel"
    - "the mimo wireless switch relaying can increase the multiplexing gain"
    - "optimal beamforming for two way multi antenna relay channel with analogue network coding"

Connected through hyperedge HE-5 (induced by source paper "wireless mimo switching"):
  with members:
    - "joint source and relay precoding designs for mimo two way relaying based on mse criterion"
    - "on the equal rate capacity of the awgn multiway relay channel"
    - "the capacity region of multiway relay channels over finite fields with full data exchange"
    - "wireless mimo switching with zero forcing relaying and network coded relaying"
    - "physical layer network coding tutorial survey and beyond"
    - "the multi way relay channel"
    - "the mimo wireless switch relaying can increase the multiplexing gain"
    - "optimal beamforming for two way multi antenna relay channel with analogue network coding"

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)