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: "optimum pilot overhead in wireless communication a unified treatment of continuous and block fading channels"
  Abstract: The optimization of the pilot overhead in wireless fading channels is investigated, and the dependence of this overhead on various system parameters of interest (e.g., fading rate, signal-to-noise ratio) is quantified. The achievable pilot-based spectral efficiency is expanded with respect to the fading rate about the no-fading point, which leads to an accurate order expansion for the pilot overhead. This expansion identifies that the pilot overhead, as well as the spectral efficiency penalty with respect to a reference system with genie-aided CSI (channel state information) at the receiver, depend on the square root of the normalized Doppler frequency. It is also shown that the widely-used block fading model is a special case of more accurate continuous fading models in terms of the achievable pilot-based spectral efficiency. Furthermore, it is established that the overhead optimization for multiantenna systems is effectively the same as for single-antenna systems with the normalized Doppler frequency multiplied by the number of transmit antennas.

Connected through hyperedge HE-1 (induced by source paper "in band pilot overhead in ultra reliable low latency decode and forward relaying"):
  with members:
    - "performance analysis of ultra reliable short message decode and forward relaying protocols"
    - "ultra reliable short message cooperative relaying protocols under nakagami m fading"
    - "on the performance of ultra reliable decode and forward relaying under the finite blocklength"
    - "delay performance of wireless communications with imperfect csi and finite length coding"
    - "finite block length analysis of the incremental redundancy harq"

Connected through hyperedge HE-2 (induced by source paper "mutual information of iid complex gaussian signals on block rayleigh faded channels"):
  with members:
    - "what is the value of joint processing of pilots and data in block fading channels"
    - "on the capacity and energy efficiency of training based transmissions over fading channels"
    - "gallager s exponent for mimo channels a reliability rate tradeoff"

Connected through hyperedge HE-3 (induced by source paper "what is the value of joint processing of pilots and data in block fading channels"):
  with members:
    - "how good is phase shift keying for peak limited rayleigh fading channels in the low snr regime"

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)