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: "a new look at dual hop relaying performance limits with hardware impairments"
  Abstract: Physical transceivers have hardware impairments that create distortions which degrade the performance of communication systems. The vast majority of technical contributions in the area of relaying neglect hardware impairments and, thus, assume ideal hardware. Such approximations make sense in low-rate systems, but can lead to very misleading results when analyzing future high-rate systems. This paper quantifies the impact of hardware impairments on dual-hop relaying, for both amplify-and-forward and decode-and-forward protocols. The outage probability (OP) in these practical scenarios is a function of the effective end-to-end signal-to-noise-and-distortion ratio (SNDR). This paper derives new closed-form expressions for the exact and asymptotic OPs, accounting for hardware impairments at the source, relay, and destination. A similar analysis for the ergodic capacity is also pursued, resulting in new upper bounds. We assume that both hops are subject to independent but non-identically distributed Nakagami-m fading. This paper validates that the performance loss is small at low rates, but otherwise can be very substantial. In particular, it is proved that for high signal-to-noise ratio (SNR), the end-to-end SNDR converges to a deterministic constant, coined the SNDR ceiling, which is inversely proportional to the level of impairments. This stands in contrast to the ideal hardware case in which the end-to-end SNDR grows without bound in the high-SNR regime. Finally, we provide fundamental design guidelines for selecting hardware that satisfies the requirements of a practical relaying system.

Connected through hyperedge HE-1 (induced by source paper "on the performance of low altitude uav enabled secure af relaying with cooperative jamming and swipt"):
  with members:
    - "safeguarding wireless network with uavs a physical layer security perspective"
    - "energy efficient resource allocation for secure uav communication systems"
    - "uav communications for 5g and beyond recent advances and future trends"
    - "secrecy transmission in large scale uav enabled wireless networks"
    - "secure two way transmission via wireless powered untrusted relay and external jammer"
    - "ultra reliable uav communication using altitude and cooperation diversity"
    - "secure two way communication via a wireless powered untrusted relay and friendly jammer"
    - "an overview of sustainable green 5g networks"

Connected through hyperedge HE-2 (induced by source paper "ergodic capacity evaluation of wireless thz fiber extenders"):
  with members:
    - "wireless terahertz system architectures for networks beyond 5g"
    - "low cost cognitive radios against spectrum scarcity"
    - "terahertz technologies to deliver optical network quality of experience in wireless systems beyond 5g"
    - "i q imbalance self interference coordination"
    - "millimeter wave cellular networks a mac layer perspective"
    - "massive mimo systems with hardware constrained base stations"
    - "optimal coordinated beamforming in the multicell downlink with transceiver impairments"
    - "mimo transmission with residual transmit rf impairments"

Connected through hyperedge HE-3 (induced by source paper "analytical performance evaluation of beamforming under transceivers hardware imperfections"):
  with members:
    - "wireless terahertz system architectures for networks beyond 5g"
    - "low cost cognitive radios against spectrum scarcity"
    - "terahertz technologies to deliver optical network quality of experience in wireless systems beyond 5g"
    - "mimo transmission with residual transmit rf impairments"

Connected through hyperedge HE-4 (induced by source paper "secure two way communication via a wireless powered untrusted relay and friendly jammer"):
  with members:
    - "optimal power allocation and secrecy sum rate in two way untrusted relaying"
    - "wireless powered relays in cooperative communications time switching relaying protocols and throughput analysis"
    - "secure communication via a wireless energy harvesting untrusted relay"
    - "wireless networks with rf energy harvesting a contemporary survey"
    - "secure communication with a wireless powered friendly jammer"

Connected through hyperedge HE-5 (induced by source paper "i q imbalance self interference coordination"):
  with members:
    - "spectrum sensing under hardware constraints"

Connected through hyperedge HE-6 (induced by source paper "impact of residual transmit rf impairments on training based mimo systems"):
  with members:
    - "pilot beam pattern design for channel estimation in massive mimo systems"
    - "massive mimo systems with non ideal hardware energy efficiency estimation and capacity limits"
    - "on the mimo capacity with residual transceiver hardware impairments"
    - "capacity bounds for mimo microwave backhaul links affected by phase noise"
    - "downlink training techniques for fdd massive mimo systems open loop and closed loop training with memory"
    - "on the impact of hardware impairments on massive mimo"
    - "two way relaying under the presence of relay transceiver hardware impairments"
    - "capacity limits and multiplexing gains of mimo channels with transceiver impairments"

Connected through hyperedge HE-7 (induced by source paper "impact of transceiver impairments on the capacity of dual hop relay massive mimo systems"):
  with members:
    - "impact of user mobility on optimal linear receivers in cellular networks"
    - "on the mimo capacity with residual transceiver hardware impairments"
    - "capacity limits and multiplexing gains of mimo channels with transceiver impairments"
    - "mimo transmission with residual transmit rf impairments"
    - "ergodic capacity analysis of amplify and forward mimo dual hop systems"

Connected through hyperedge HE-8 (induced by source paper "cooperative relaying in underlay cognitive systems with hardware impairments"):
  with members:
    - "on the mimo capacity with residual transceiver hardware impairments"
    - "two way relaying under the presence of relay transceiver hardware impairments"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"

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)