human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "optimal relaying beamforming in multiple access broadcast channel mabc bidirectional cognitive radio networks in presence of interferers"):
  Abstract: In this paper, a general cognitive radio system consisting of a set of users with different level of spectrum access including two primary transceivers and several types of secondary users is considered. It is assumed that two secondary users operate based on an underlay model at the same frequency bandwidth and at the same time as the primary users based on a multiple access broadcast channel (MABC) bidirectional beamforming scheme. Other secondary users provide a relaying service to the primary users in exchange for the opportunity to send their messages towards their own destinations for a fixed portion of the communication cycle. In addition, it is assumed that some interferers are active during the communication cycle and cause interference for the network. Furthermore, it is assumed that only partial channel state information (CSI) between interferers and other nodes in the network is available. #R##N#We provide a robust optimization method against imperfection on the interferers' CSI to maximize the joint primary and secondary {signal-to-interference-plus-noise-ratio (SINR)} with the assumption of limited available power at the secondary relays. An amplify-and-forward (AF) relaying scheme is deployed at the secondary relays and the optimal beamforming is obtained using second order convex programming (SOCP) method. The simulation results show the performance of the proposed beamforming method against the existence of interferers, and demonstrate the effectiveness of our robust method against uncertainty in knowledge of interferers' CSIs.

Includes members:
  Member "a reputation based stackelberg game model to enhance secrecy rate in spectrum leasing to selfish iot devices":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "a survey on hardware based security mechanisms for internet of things")
  Member "resource allocation and outage analysis for an adaptive cognitive two way relay network":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "generalized optimal two way relays subsets pairings in cloud based region cognitive networks")
  Member "spectrum sharing in cooperative cognitive radio networks a matching game framework":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "an autonomous spectrum management scheme for unmanned aerial vehicle networks in disaster relief operations")
  Member "energy efficient power allocation in cognitive radio systems with imperfect spectrum sensing":
    also connected through other hyperedges:
      (none)
  Member "cooperative algorithms for mimo amplify and forward relay networks":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "relaying strategies for wireless powered mimo relay networks")
  Member "relay selection and resource allocation for two way df af cognitive radio networks":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "resource allocation and outage analysis for an adaptive cognitive two way relay network")
  Member "cognitive radio an information theoretic perspective":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "cognitive radio networks an information theoretic perspective")

Question: Please tell me which class the source paper 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)