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: "linear precoder design for mimo interference channels with finite alphabet signaling"
  Abstract: This paper investigates the linear precoder design for K-user interference channels of multiple-input multiple-output (MIMO) transceivers under finite alphabet inputs. We first obtain general explicit expressions of the achievable rate for users in the MIMO interference channel systems. We study optimal transmission strategies in both low and high signal-to-noise ratio (SNR) regions. Given finite alphabet inputs, we show that a simple power allocation design achieves optimal performance at high SNR whereas the well-known interference alignment technique for Gaussian inputs only utilizes a partial interference-free signal space for transmission and leads to a constant rate loss when applied naively to finite-alphabet inputs. Moreover, we establish necessary conditions for the linear precoder design to achieve weighted sum-rate maximization. We also present an efficient iterative algorithm for determining precoding matrices of all the users. Our numerical results demonstrate that the proposed iterative algorithm achieves considerably higher sum-rate under practical QAM inputs than other known methods.

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 transmission with large numbers of antennas and finite alphabet inputs"):
  with members:
    - "physical layer security for spectrum sharing systems"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "secure massive mimo transmission with an active eavesdropper"
    - "large scale mimo relaying techniques for physical layer security af or df"
    - "multi antenna relay aided wireless physical layer security"
    - "low complexity mimo precoding with discrete signals and statistical csi"
    - "linear precoding for the mimo multiple access channel with finite alphabet inputs and statistical csi"

Connected through hyperedge HE-3 (induced by source paper "large scale mimo secure transmission with finite alphabet inputs"):
  with members:
    - "secure massive mimo transmission with an active eavesdropper"
    - "linear precoding for the mimo multiple access channel with finite alphabet inputs and statistical csi"
    - "massive mimo for next generation wireless systems"
    - "on secrecy rate analysis of mimo wiretap channels driven by finite alphabet input"
    - "precoding by pairing subchannels to increase mimo capacity with discrete input alphabets"
    - "secure communication in the low snr regime"

Connected through hyperedge HE-4 (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"
    - "transmit designs for the mimo broadcast channel with statistical csi"
    - "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"
    - "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-5 (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"
    - "transmit designs for the mimo broadcast channel with statistical csi"
    - "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"

Connected through hyperedge HE-6 (induced by source paper "transmit designs for the mimo broadcast channel with statistical csi"):
  with members:
    - "linear mimo precoding in jointly correlated fading multiple access channels with finite alphabet signaling"
    - "linear beamforming for the spatially correlated miso broadcast channel"
    - "dirty paper coding for fading channels with partial transmitter side information"
    - "statistical eigenmode transmission over jointly correlated mimo channels"
    - "dirty paper coding without channel information at the transmitter and imperfect estimation at the receiver"
    - "on the fading paper achievable region of the fading mimo broadcast channel"

Connected through hyperedge HE-7 (induced by source paper "linear mimo precoding in jointly correlated fading multiple access channels with finite alphabet signaling"):
  with members:
    - "a novel power allocation scheme for two user gmac with finite input constellations"
    - "hessian and concavity of mutual information differential entropy and entropy power in linear vector gaussian channels"
    - "vector precoding for wireless mimo systems and its replica analysis"
    - "randomly spread cdma asymptotics via statistical physics"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-8 (induced by source paper "on precoding for constant k user mimo gaussian interference channel with finite constellation inputs"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "interference alignment for the mimo interference channel with delayed local csit"
    - "two user gaussian interference channel with finite constellation input and fdma"
    - "achievable rates in two user interference channels with finite inputs and very strong interference"
    - "interference alignment for the k user mimo interference channel"
    - "capacity regions and sum rate capacities of vector gaussian interference channels"
    - "linear transceiver design for interference alignment complexity and computation"
    - "mimo precoding with x and y codes"

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)