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: "benefits of improper signaling for underlay cognitive radio"
  Abstract: In this letter we study the potential benefits of improper signaling for a secondary user (SU) in underlay cognitive radio networks. We consider a basic yet illustrative scenario in which the primary user (PU) always transmit proper Gaussian signals and has a minimum rate constraint. After parameterizing the SU transmit signal in terms of its power and circularity coefficient (which measures the degree of impropriety), we prove that the SU improves its rate by transmitting improper signals only when the ratio of the squared modulus between the SU-PU interference link and the SU direct link exceeds a given threshold. As a by-product of this analysis, we obtain the optimal circularity coefficient that must be used by the SU depending on its power budget. Some simulation results show that the SU benefits from the transmission of improper signals especially when the PU is not highly loaded.

Connected through hyperedge HE-1 (induced by source paper "multiple importance sampling for efficient symbol error rate estimation"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-2 (induced by source paper "full duplex relaying with improper gaussian signaling over nakagami m fading channels"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "improper gaussian signaling in full duplex relay channels with residual self interference"
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "spectrum sharing opportunities of full duplex systems using improper gaussian signaling"
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-3 (induced by source paper "improper gaussian signaling for multiple access channels in underlay cognitive radio"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "improper gaussian signaling in full duplex relay channels with residual self interference"
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "on ergodic sum capacity of fading cognitive multiple access and broadcast channels"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-4 (induced by source paper "rate region boundary of the siso z interference channel with improper signaling"):
  with members:
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "joint transmitter and receiver optimization for improper complex second order stationary data sequence"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "complex valued random vectors and channels entropy divergence and capacity"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-5 (induced by source paper "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"):
  with members:
    - "improper gaussian signaling in full duplex relay channels with residual self interference"
    - "throughput analysis and optimization of wireless powered multiple antenna full duplex relay systems"
    - "sharing the licensed spectrum of full duplex systems using improper gaussian signaling"
    - "spectrum sharing opportunities of full duplex systems using improper gaussian signaling"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "in band full duplex wireless challenges and opportunities"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-6 (induced by source paper "improper signaling in two path relay channels"):
  with members:
    - "improper signaling for virtual full duplex relay systems"
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "transmit optimization with improper gaussian signaling for interference channels"

Connected through hyperedge HE-7 (induced by source paper "sharing the licensed spectrum of full duplex systems using improper gaussian signaling"):
  with members:
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-8 (induced by source paper "spectrum sharing opportunities of full duplex systems using improper gaussian signaling"):
  with members:
    - "full duplex cooperative cognitive radio with transmit imperfections"
    - "transmit optimization with improper gaussian signaling for interference channels"
    - "in band full duplex wireless challenges and opportunities"

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)