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: "on the capacity of a class of mimo cognitive radios"
  Abstract: Cognitive radios have been studied recently as a means to utilize spectrum in a more efficient manner. This paper focuses on the fundamental limits of operation of a MIMO cognitive radio network with a single licensed user and a single cognitive user. The channel setting is equivalent to an interference channel with degraded message sets (with the cognitive user having access to the licensed user's message). An achievable region and an outer bound is derived for such a network setting. It is shown that under certain conditions, the achievable region is optimal for a portion of the capacity region that includes sum capacity.

Connected through hyperedge HE-1 (induced by source paper "fifty years of mimo detection the road to large scale mimos"):
  with members:
    - "large scale mimo detection for 3gpp lte algorithms and fpga implementations"
    - "an esprit based approach for 2 d localization of incoherently distributed sources in massive mimo systems"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"
    - "approximate bayesian probabilistic data association aided iterative detection for mimo systems using arbitrary m ary modulation"
    - "channel hardening exploiting message passing chemp receiver in large scale mimo systems"
    - "five disruptive technology directions for 5g"
    - "scaling up mimo opportunities and challenges with very large arrays"

Connected through hyperedge HE-2 (induced by source paper "multi user cognitive interference channels a survey and new capacity results"):
  with members:
    - "the two user causal cognitive interference channel novel outer bounds and constant gap result for the symmetric gaussian noise channel in weak interference"
    - "on the capacity region of the two user interference channel with a cognitive relay"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "on the capacity of the two user gaussian causal cognitive interference channel"
    - "on the gaussian interference channel with half duplex causal cognition"
    - "multiuser cognitive radio networks an information theoretic perspective"
    - "approximate sum capacity of k user cognitive interference channels with cumulative message sharing"
    - "simultaneous nonunique decoding is rate optimal"

Connected through hyperedge HE-3 (induced by source paper "on the throughput and energy efficiency of cognitive mimo transmissions"):
  with members:
    - "cognitive radio transmission under qos constraints and interference limitations"
    - "performance analysis of cognitive radio systems under qos constraints and channel uncertainty"
    - "optimal spectrum sharing in mimo cognitive radio networks via semidefinite programming"
    - "from spectrum pooling to space pooling opportunistic interference alignment in mimo cognitive networks"
    - "mimo wireless communications under statistical queueing constraints"
    - "effective capacity analysis of cognitive radio channels for quality of service provisioning"
    - "design of learning based mimo cognitive radio systems"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"

Connected through hyperedge HE-4 (induced by source paper "multiuser cognitive radio networks an information theoretic perspective"):
  with members:
    - "on the sum rate of a 2 x 2 interference network"
    - "capacity to within 3 bits for a class of gaussian interference channels with a cognitive relay"
    - "the capacity of the semi deterministic cognitive interference channel and its application to constant gap results for the gaussian channel"
    - "new results on the capacity of the gaussian cognitive interference channel"
    - "new inner and outer bounds for the discrete memoryless cognitive interference channel and some capacity results"
    - "interference channels with one cognitive transmitter"
    - "the gaussian mac with conferencing encoders"
    - "on the capacity of interference channels with one cooperating transmitter"

Connected through hyperedge HE-5 (induced by source paper "spectrum leasing via cooperation for enhanced physical layer secrecy"):
  with members:
    - "interference assisted secret communication"
    - "optimal beamforming in interference networks with perfect local channel information"
    - "secure transmission with artificial noise over fading channels achievable rate and optimal power allocation"

Connected through hyperedge HE-6 (induced by source paper "difference antenna selection and power allocation for wireless cognitive systems"):
  with members:
    - "power loading in parallel diversity channels based on statistical channel information"
    - "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"
    - "weighted sum rate optimization for cognitive radio mimo broadcast channels"

Connected through hyperedge HE-7 (induced by source paper "the degrees of freedom regions of mimo broadcast interference and cognitive radio channels with no csit"):
  with members:
    - "real interference alignment exploiting the potential of single antenna systems"
    - "completely stale transmitter channel state information is still very useful"
    - "exploiting channel correlations simple interference alignment schemes with no csit"
    - "the degrees of freedom region of the mimo cognitive interference channel with no csit"
    - "the degrees of freedom of mimo interference channels without state information at transmitters"
    - "dirty paper coding for the mimo cognitive radio channel with imperfect csit"
    - "capacity bounds for two hop interference networks"
    - "interference alignment under limited feedback for mimo interference channels"

Connected through hyperedge HE-8 (induced by source paper "dirty paper coding for the mimo cognitive radio channel with imperfect csit"):
  with members:
    - "dirty paper coding for fading channels with partial transmitter side information"
    - "on the achievable rate of the fading dirty paper channel with imperfect csit"
    - "adaptive sum power iterative waterfilling for mimo cognitive radio channels"
    - "cognitive radio an information theoretic perspective"

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)