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: "softnull many antenna full duplex wireless via digital beamforming"
  Abstract: In this paper, we present and study a digital-controlled method, called SoftNull, to enable full-duplex in many-antenna systems. Unlike most designs that rely on analog cancelers to suppress self-interference, SoftNull relies on digital transmit beamforming to reduce self-interference. SoftNull does not attempt to perfectly null self-interference, but instead seeks to reduce self-interference sufficiently to prevent swamping the receiver’s dynamic range. Residual self-interference is then cancelled digitally by the receiver. We evaluate the performance of SoftNull using measurements from a 72-element antenna array in both indoor and outdoor environments. We find that SoftNull can significantly outperform half-duplex for small cells operating in the many-antenna regime, where the number of antennas is many more than the number of users served simultaneously.

Connected through hyperedge HE-1 (induced by source paper "best relay selection in gaussian half duplex diamond networks"):
  with members:
    - "efficiently finding simple schedules in gaussian half duplex relay line networks"
    - "on the optimality of simple schedules for networks with multiple half duplex relays"
    - "wireless communications with unmanned aerial vehicles opportunities and challenges"
    - "unmanned aerial vehicle with underlaid device to device communications performance and tradeoffs"
    - "wireless network simplification beyond diamond networks"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "gaussian half duplex relay networks improved constant gap and connections with the assignment problem"
    - "wireless network information flow a deterministic approach"

Connected through hyperedge HE-2 (induced by source paper "full duplex hybrid a d beamforming with reduced complexity multi tap analog cancellation"):
  with members:
    - "joint design of multi tap analog cancellation and digital beamforming for reduced complexity full duplex mimo systems"
    - "full duplex millimeter wave communication"
    - "user scheduling and optimal power allocation for full duplex cellular networks"
    - "hybrid beamforming for massive mimo a survey"
    - "widely linear digital self interference cancellation in direct conversion full duplex transceiver"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-3 (induced by source paper "low complexity full duplex mimo novel analog cancellation architectures and transceiver design"):
  with members:
    - "joint design of multi tap analog cancellation and digital beamforming for reduced complexity full duplex mimo systems"
    - "user scheduling and optimal power allocation for full duplex cellular networks"
    - "performance evaluation of user scheduling for full duplex small cells in ultra dense networks"
    - "optimal low complexity self interference cancellation for full duplex mimo small cells"
    - "hybrid beamforming for massive mimo a survey"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "in band full duplex wireless challenges and opportunities"
    - "experiment driven characterization of full duplex wireless systems"

Connected through hyperedge HE-4 (induced by source paper "how to split ul dl antennas in full duplex cellular networks"):
  with members:
    - "on the spectral efficiency of full duplex small cell wireless systems"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "in band full duplex wireless challenges and opportunities"
    - "experiment driven characterization of full duplex wireless systems"

Connected through hyperedge HE-5 (induced by source paper "secrecy energy efficiency of mimome wiretap channels with full duplex jamming"):
  with members:
    - "multi tenant c ran with spectrum pooling downlink optimization under privacy constraints"
    - "exploiting full duplex receivers for achieving secret communications in multiuser miso networks"
    - "a survey of energy efficient techniques for 5g networks and challenges ahead"
    - "hardware impairments aware transceiver for full duplex massive mimo relaying"
    - "multi objective optimization for robust power efficient and secure full duplex wireless communication systems"
    - "joint design of optimal cooperative jamming and power allocation for linear precoding"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "passive self interference suppression for full duplex infrastructure nodes"

Connected through hyperedge HE-6 (induced by source paper "joint design of multi tap analog cancellation and digital beamforming for reduced complexity full duplex mimo systems"):
  with members:
    - "user scheduling and optimal power allocation for full duplex cellular networks"
    - "optimal low complexity self interference cancellation for full duplex mimo small cells"
    - "design and characterization of a full duplex multiantenna system for wifi networks"
    - "in band full duplex wireless challenges and opportunities"
    - "experiment driven characterization of full duplex wireless systems"

Connected through hyperedge HE-7 (induced by source paper "sequential beamforming for multiuser mimo with full duplex training"):
  with members:
    - "measurement driven evaluation of all digital many antenna full duplex communication"
    - "rate gain region and design tradeoffs for full duplex wireless communications"
    - "self interference cancellation with nonlinear distortion suppression for full duplex systems"
    - "in band full duplex wireless challenges and opportunities"
    - "distributed full duplex via wireless side channels bounds and protocols"
    - "experiment driven characterization of full duplex wireless systems"
    - "full duplex bidirectional mimo achievable rates under limited dynamic range"
    - "training and feedback optimization for multiuser mimo downlink"

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)