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: "jamming games in the mimo wiretap channel with an active eavesdropper"
  Abstract: This paper investigates reliable and covert transmission strategies in a multiple-input multiple-output (MIMO) wiretap channel with a transmitter, receiver and an adversarial wiretapper, each equipped with multiple antennas. In a departure from existing work, the wiretapper possesses a novel capability to act either as a passive eavesdropper or as an active jammer, under a half-duplex constraint. The transmitter therefore faces a choice between allocating all of its power for data, or broadcasting artificial interference along with the information signal in an attempt to jam the eavesdropper (assuming its instantaneous channel state is unknown). To examine the resulting trade-offs for the legitimate transmitter and the adversary, we model their interactions as a two-person zero-sum game with the ergodic MIMO secrecy rate as the payoff function. We first examine conditions for the existence of pure-strategy Nash equilibria (NE) and the structure of mixed-strategy NE for the strategic form of the game. We then derive equilibrium strategies for the extensive form of the game where players move sequentially under scenarios of perfect and imperfect information. Finally, numerical simulations are presented to examine the equilibrium outcomes of the various scenarios considered.

Connected through hyperedge HE-1 (induced by source paper "cell free massive mimo networks optimal power control against active eavesdropping"):
  with members:
    - "on the total energy efficiency of cell free massive mimo"
    - "mimo beamforming for secure and energy efficient wireless communication"
    - "energy efficiency in cell free massive mimo with zero forcing precoding design"
    - "mimo secret communications against an active eavesdropper"
    - "cell free massive mimo versus small cells"
    - "cell free massive mimo uniformly great service for everyone"
    - "secure massive mimo transmission with an active eavesdropper"
    - "secret key agreement with large antenna arrays under the pilot contamination attack"

Connected through hyperedge HE-2 (induced by source paper "mimo secret communications against an active eavesdropper"):
  with members:
    - "secure degrees of freedom regions of multiple access and interference channels the polytope structure"
    - "linear precoding of data and artificial noise in secure massive mimo systems"
    - "improving wireless physical layer security via exploiting co channel interference"
    - "secure massive mimo transmission with an active eavesdropper"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "secure massive mimo transmission in the presence of an active eavesdropper"
    - "secure degrees of freedom of one hop wireless networks"
    - "improving physical layer secrecy using full duplex jamming receivers"

Connected through hyperedge HE-3 (induced by source paper "secure multicast communications with private jammers"):
  with members:
    - "improving physical layer secrecy using full duplex jamming receivers"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "optimal and robust transmit designs for miso channel secrecy by semidefinite programming"
    - "cooperative jamming for secure communications in mimo relay networks"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"
    - "physical layer security coalitional games for distributed cooperation"

Connected through hyperedge HE-4 (induced by source paper "game theory for signal processing in networks"):
  with members:
    - "understanding game theory via wireless power control"
    - "crawford sobel meet lloyd max on the grid"
    - "coalitional games in miso interference channels epsilon core and coalition structure stable set"
    - "multiobjective signal processing optimization the way to balance conflicting metrics in 5g systems"
    - "distributed cooperative sensing in cognitive radio networks an overlapping coalition formation approach"
    - "distributed adaptive networks a graphical evolutionary game theoretic view"
    - "distributed learning policies for power allocation in multiple access channels"
    - "on the nash equilibria in decentralized parallel interference channels"

Connected through hyperedge HE-5 (induced by source paper "apply artificial noise to secure fading relay networks a ser based approach"):
  with members:
    - "secure communication via an untrusted non regenerative relay in fading channels"
    - "imbalanced beamforming by a multi antenna source for secure utilization of an untrusted relay"
    - "new results on multiple input multiple output broadcast channels with confidential messages"
    - "secrecy sum rates for multi user mimo regularized channel inversion precoding"
    - "a tutorial on the optimization of amplify and forward mimo relay systems"
    - "physical layer network coding tutorial survey and beyond"
    - "solutions for the mimo gaussian wiretap channel with a cooperative jammer"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"

Connected through hyperedge HE-6 (induced by source paper "artificial noise aided secure multi antenna transmission with limited feedback"):
  with members:
    - "enhancing secrecy with multi antenna transmission in wireless ad hoc networks"
    - "spatially selective artificial noise aided transmit optimization for miso multi eves secrecy rate maximization"
    - "on the design of artificial noise aided secure multi antenna transmission in slow fading channels"
    - "rethinking the secrecy outage formulation a secure transmission design perspective"
    - "robust beamforming for security in mimo wiretap channels with imperfect csi"
    - "on the throughput cost of physical layer security in decentralized wireless networks"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"
    - "diversity multiplexing tradeoff for the multiple antenna wire tap channel"

Connected through hyperedge HE-7 (induced by source paper "transmit design for mimo wiretap channel with a malicious jammer"):
  with members:
    - "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"
    - "secure transmission with multiple antennas ii the mimome wiretap channel"

Connected through hyperedge HE-8 (induced by source paper "proactive eavesdropping via jamming for rate maximization over rayleigh fading channels"):
  with members:
    - "a survey on wireless security technical challenges recent advances and future trends"
    - "physical layer security for massive mimo an overview on passive eavesdropping and active attacks"
    - "half duplex active eavesdropping in fast fading channels a block markov wyner secrecy encoding scheme"

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)