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: "sum rates rate allocation and user scheduling for multi user mimo vector perturbation precoding"
  Abstract: This paper considers the multiuser multiple-input multiple-output (MIMO) broadcast channel. We consider the case where the multiple transmit antennas are used to deliver independent data streams to multiple users via vector perturbation. We derive expressions for the sum rate in terms of the average energy of the precoded vector, and use this to derive a high signal-to-noise ratio (SNR) closed-form upper bound, which we show to be tight via simulation. We also propose a modification to vector perturbation where different rates can be allocated to different users. We conclude that for vector perturbation precoding most of the sum rate gains can be achieved by reducing the rate allocation problem to the user selection problem. We then propose a low-complexity user selection algorithm that attempts to maximize the high-SNR sum rate upper bound. Simulations show that the algorithm outperforms other user selection algorithms of similar complexity.

Connected through hyperedge HE-1 (induced by source paper "on the throughput of large but finite mimo networks using schedulers"):
  with members:
    - "tomlinson harashima precoding for multiuser mimo systems with quantized csi feedback and user scheduling"
    - "network mimo with linear zero forcing beamforming large system analysis impact of channel estimation and reduced complexity scheduling"
    - "multi user mimo scheduling in the fourth generation cellular uplink"
    - "multi cell mimo downlink with cell cooperation and fair scheduling a large system limit analysis"
    - "user scheduling for heterogeneous multiuser mimo systems a subspace viewpoint"
    - "maximum sum rate of mimo multiuser scheduling with linear receivers"

Connected through hyperedge HE-2 (induced by source paper "an overview on resource allocation techniques for multi user mimo systems"):
  with members:
    - "low complexity downlink user selection for massive mimo systems"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "user association in 5g networks a survey and an outlook"
    - "cell free massive mimo versus small cells"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "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"

Connected through hyperedge HE-3 (induced by source paper "near optimal linear precoding with low complexity for massive mimo"):
  with members:
    - "large scale mimo detection for 3gpp lte algorithms and fpga implementations"
    - "linear precoding based on polynomial expansion large scale multi cell mimo systems"
    - "five disruptive technology directions for 5g"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "energy and spectral efficiency of very large multiuser mimo systems"
    - "mimo detection for high order qam based on a gaussian tree approximation"

Connected through hyperedge HE-4 (induced by source paper "on the achievable dof and user scaling law of opportunistic interference alignment in 3 transmitter mimo interference channels"):
  with members:
    - "mimo interference alignment over correlated channels with imperfect csi"
    - "cooperative algorithms for mimo interference channels"
    - "interference alignment with analog channel state feedback"
    - "from spectrum pooling to space pooling opportunistic interference alignment in mimo cognitive networks"
    - "interference alignment under limited feedback for mimo interference channels"
    - "interference alignment with limited feedback"
    - "opportunistic spatial orthogonalization and its application in fading cognitive radio networks"
    - "degrees of freedom of the k user m times n mimo interference channel"

Connected through hyperedge HE-5 (induced by source paper "large system analysis of joint user selection and vector precoding for multiuser mimo downlink"):
  with members:
    - "large system analysis of joint channel and data estimation for mimo ds cdma systems"
    - "a greedy algorithm of data dependent user selection for fast fading gaussian vector broadcast channels"
    - "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"
    - "analysis of cdma systems that are characterized by eigenvalue spectrum"
    - "randomly spread cdma asymptotics via statistical physics"

Connected through hyperedge HE-6 (induced by source paper "secrecy sum rates for multi user mimo regularized channel inversion precoding"):
  with members:
    - "principles of physical layer security in multiuser wireless networks a survey"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "eigen based transceivers for the mimo broadcast channel with semi orthogonal user selection"
    - "the secrecy capacity region of the gaussian mimo multi receiver wiretap channel"

Connected through hyperedge HE-7 (induced by source paper "user scheduling for heterogeneous multiuser mimo systems a subspace viewpoint"):
  with members:
    - "eigen based transceivers for the mimo broadcast channel with semi orthogonal user selection"
    - "limited feedback based block diagonalization for the mimo broadcast channel"
    - "on the user selection for mimo broadcast channels"

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)