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: "investigation on multiuser diversity in spectrum sharing based cognitive radio networks"
  Abstract: A new form of multiuser diversity, named \emph{multiuser interference diversity}, is investigated for opportunistic communications in cognitive radio (CR) networks by exploiting the mutual interference between the CR and the existing primary radio (PR) links. The multiuser diversity gain and ergodic throughput are analyzed for different types of CR networks and compared against those in the conventional networks without the PR link.

Connected through hyperedge HE-1 (induced by source paper "asymptotic performance analysis of generalized user selection for interference limited multiuser secondary networks"):
  with members:
    - "on the asymptotic throughput of the k th best secondary user selection in cognitive radio systems"
    - "optimal power allocation for fading channels in cognitive radio networks ergodic capacity and outage capacity"

Connected through hyperedge HE-2 (induced by source paper "random aerial beamforming for underlay cognitive radio with exposed secondary users"):
  with members:
    - "spectrum sensing via reconfigurable antennas fundamental limits and potential gains"
    - "efficient mimo transmission of psk signals with a single radio reconfigurable antenna"
    - "spectrum sharing scheme between cellular users and ad hoc device to device users"

Connected through hyperedge HE-3 (induced by source paper "adaptive mode selection in multiuser miso cognitive networks with limited cooperation and feedback"):
  with members:
    - "interference aware resource control in multi antenna cognitive ad hoc networks with heterogeneous delay constraints"
    - "censored truncated sequential spectrum sensing for cognitive radio networks"
    - "multi mode transmission for the mimo broadcast channel with imperfect channel state information"
    - "price based resource allocation for spectrum sharing femtocell networks a stackelberg game approach"
    - "design of learning based mimo cognitive radio systems"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"
    - "on peak versus average interference power constraints for protecting primary users in cognitive radio networks"
    - "mimo broadcast channels with finite rate feedback"

Connected through hyperedge HE-4 (induced by source paper "distributed cognitive multiple access networks power control scheduling and multiuser diversity"):
  with members:
    - "multiuser diversity for the cognitive uplink with generalized fading and reduced primary s cooperation"
    - "power control and multiuser diversity for the distributed cognitive uplink"
    - "multiuser diversity gain in cognitive networks"
    - "on ergodic sum capacity of fading cognitive multiple access and broadcast channels"

Connected through hyperedge HE-5 (induced by source paper "cognitive radio with random number of secondary number of users"):
  with members:
    - "multi user diversity with random number of users"
    - "multiuser diversity gain in cognitive networks"

Connected through hyperedge HE-6 (induced by source paper "multiuser diversity for the cognitive uplink with generalized fading and reduced primary s cooperation"):
  with members:
    - "multiuser diversity gain in cognitive networks"
    - "on ergodic sum capacity of fading cognitive multiple access and broadcast channels"
    - "optimal power allocation for fading channels in cognitive radio networks ergodic capacity and outage capacity"

Connected through hyperedge HE-7 (induced by source paper "random subcarrier allocation in ofdm based cognitive radio networks"):
  with members:
    - "on ergodic sum capacity of fading cognitive multiple access and broadcast channels"
    - "optimal power allocation for fading channels in cognitive radio networks ergodic capacity and outage capacity"
    - "on peak versus average interference power constraints for protecting primary users in cognitive radio networks"

Connected through hyperedge HE-8 (induced by source paper "power control and multiuser diversity for the distributed cognitive uplink"):
  with members:
    - "multiuser diversity gain in cognitive networks"
    - "capacity limits of multiuser multiantenna cognitive networks"
    - "on ergodic sum capacity of fading cognitive multiple access and 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)