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: "transmit designs for the mimo broadcast channel with statistical csi"
  Abstract: We investigate the multiple-input multiple-output broadcast channel with statistical channel state information available at the transmitter. The so-called linear assignment operation is employed, and necessary conditions are derived for the optimal transmit design under general fading conditions. Based on this, we introduce an iterative algorithm to maximize the linear assignment weighted sum-rate by applying a gradient descent method. To reduce complexity, we derive an upper bound of the linear assignment achievable rate of each receiver, from which a simplified closed-form expression for a near-optimal linear assignment matrix is derived. This reveals an interesting construction analogous to that of dirty-paper coding. In light of this, a low complexity transmission scheme is provided. Numerical examples illustrate the significant performance of the proposed low complexity scheme.

Connected through hyperedge HE-1 (induced by source paper "data aided secure massive mimo transmission under the pilot contamination attack"):
  with members:
    - "a survey of physical layer security techniques for 5g wireless networks and challenges ahead"
    - "pilot spoofing attack by multiple eavesdroppers"
    - "multiple antennas secure transmission under pilot spoofing and jamming attack"
    - "secure transmission with large numbers of antennas and finite alphabet inputs"
    - "massive mimo pilot decontamination and channel interpolation via wideband sparse channel estimation"
    - "analysis and design of secure massive mimo systems in the presence of hardware impairments"
    - "performance limits of massive mimo systems based on bayes optimal inference"
    - "secure massive mimo transmission with an active eavesdropper"

Connected through hyperedge HE-2 (induced by source paper "secure communications in noma system subcarrier assignment and power allocation"):
  with members:
    - "secure transmission with large numbers of antennas and finite alphabet inputs"
    - "sub channel assignment power allocation and user scheduling for non orthogonal multiple access networks"
    - "on the spectral efficiency and security enhancements of noma assisted multicast unicast streaming"
    - "secrecy wireless information and power transfer in fading wiretap channel"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "power and channel allocation for non orthogonal multiple access in 5g systems tractability and computation"
    - "multi phase smart relaying and cooperative jamming in secure cognitive radio networks"
    - "secure massive mimo transmission with an active eavesdropper"

Connected through hyperedge HE-3 (induced by source paper "a survey on mimo transmission with discrete input signals technical challenges advances and future trends"):
  with members:
    - "asymptotic performance analysis of a k hop amplify and forward relay mimo channel"
    - "iterative distributed minimum total mse approach for secure communications in mimo interference channels"
    - "asymptotic analysis of su mimo channels with transmitter noise and mismatched joint decoding"
    - "secure massive mimo transmission with an active eavesdropper"
    - "interference aligned space time transmission with diversity for the 2 times 2 x network"
    - "space time encoded miso broadcast channel with outdated csit an error rate and diversity performance analysis"
    - "high snr asymptotics of mutual information for discrete constellations with applications to bicm"
    - "differential distributed space time coding with imperfect synchronization in frequency selective channels"

Connected through hyperedge HE-4 (induced by source paper "sum rate maximization for linearly precoded downlink multiuser miso systems with partial csit a rate splitting approach"):
  with members:
    - "miso networks with imperfect csit a topological rate splitting approach"
    - "robust transmission in downlink multiuser miso systems a rate splitting approach"
    - "a rate splitting strategy for massive mimo with imperfect csit"
    - "sum rate maximization for mu miso with partial csit using joint multicasting and broadcasting"
    - "rate analysis of two receiver miso broadcast channel with finite rate feedback a rate splitting approach"
    - "achieving max min fairness for mu miso with partial csit a multicast assisted transmission"
    - "optimal multiuser transmit beamforming a difficult problem with a simple solution structure"
    - "ammse optimization for multiuser miso systems with imperfect csit and perfect csir"

Connected through hyperedge HE-5 (induced by source paper "low complexity mimo precoding for finite alphabet signals"):
  with members:
    - "linear precoding for mimo channels with qam constellations and reduced complexity"
    - "secure massive mimo transmission with an active eavesdropper"
    - "five disruptive technology directions for 5g"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "on capacity of large scale mimo multiple access channels with distributed sets of correlated antennas"
    - "precoding by pairing subchannels to increase mimo capacity with discrete input alphabets"
    - "statistical eigenmode transmission over jointly correlated mimo channels"
    - "on optimal precoding in linear vector gaussian channels with arbitrary input distribution"

Connected through hyperedge HE-6 (induced by source paper "secure massive mimo transmission with an active eavesdropper"):
  with members:
    - "channel acquisition for massive mimo ofdm with adjustable phase shift pilots"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "physical layer security in heterogeneous cellular networks"
    - "an overview of transmission theory and techniques of large scale antenna systems for 5g wireless communications"
    - "joint csit acquisition based on low rank matrix completion for fdd massive mimo systems"
    - "physical layer security in massive mimo"
    - "large scale mimo relaying techniques for physical layer security af or df"
    - "multi antenna relay aided wireless physical layer security"

Connected through hyperedge HE-7 (induced by source paper "linear precoding for the mimo multiple access channel with finite alphabet inputs and statistical csi"):
  with members:
    - "performance limits of massive mimo systems based on bayes optimal inference"
    - "massive mimo for next generation wireless systems"
    - "a novel power allocation scheme for two user gmac with finite input constellations"
    - "large system analysis of correlated mimo multiple access channels with arbitrary signaling in the presence of interference"
    - "linear precoder design for mimo interference channels with finite alphabet signaling"
    - "scaling up mimo opportunities and challenges with very large arrays"
    - "a deterministic equivalent for the analysis of correlated mimo multiple access channels"
    - "the dynamics of message passing on dense graphs with applications to compressed sensing"

Connected through hyperedge HE-8 (induced by source paper "low complexity mimo precoding with discrete signals and statistical csi"):
  with members:
    - "linear precoding for mimo channels with qam constellations and reduced complexity"
    - "secure massive mimo transmission with an active eavesdropper"
    - "linear precoding for the mimo multiple access channel with finite alphabet inputs and statistical csi"
    - "secure massive mimo transmission in the presence of an active eavesdropper"
    - "linear precoder design for mimo interference channels with finite alphabet signaling"
    - "on capacity of large scale mimo multiple access channels with distributed sets of correlated antennas"
    - "precoding by pairing subchannels to increase mimo capacity with discrete input alphabets"
    - "statistical eigenmode transmission over jointly correlated mimo 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)