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: "gallager s exponent for mimo channels a reliability rate tradeoff"
  Abstract: In this paper, we derive Gallager's random coding error exponent for multiple-input multiple-output (MIMO) channels, assuming no channel-state information (CSI) at the transmitter and perfect CSI at the receiver. This measure gives insight into a fundamental tradeoff between the communication reliability and information rate of MIMO channels, enabling to determine the required codeword length to achieve a prescribed error probability at a given rate below the channel capacity. We quantify the effects of the number of antennas, channel coherence time, and spatial fading correlation on the MIMO exponent. In addition, general formulae for the ergodic capacity and the cutoff rate in the presence of spatial correlation are deduced from the exponent expressions. These formulae are applicable to arbitrary structures of transmit and receive correlation, encompassing all the previously known results as special cases of our expressions.

Connected through hyperedge HE-1 (induced by source paper "saddlepoint approximations for short packet wireless communications"):
  with members:
    - "secure short packet communications for mission critical iot applications"
    - "efficient error correcting codes in the short blocklength regime"
    - "short packet downlink transmission with non orthogonal multiple access"
    - "5g wireless network slicing for embb urllc and mmtc a communication theoretic view"
    - "short packets over block memoryless fading channels pilot assisted or noncoherent transmission"
    - "joint sum rate and error probability optimization finite blocklength analysis"
    - "coherent multiple antenna block fading channels at finite blocklength"
    - "on single antenna rayleigh block fading channels at finite blocklength"

Connected through hyperedge HE-2 (induced by source paper "the sphere packing bound for dspcs with feedback a la augustin"):
  with members:
    - "the renyi capacity and center"
    - "the sphere packing bound for memoryless channels"
    - "the augustin capacity and center"
    - "the sphere packing bound via augustin s method"
    - "on pinsker s and vajda s type inequalities for csiszar s f divergences"

Connected through hyperedge HE-3 (induced by source paper "gallager bound for mimo channels large n asymptotics"):
  with members:
    - "outage capacity for the optical mimo channel"
    - "moderate deviations in channel coding"
    - "living at the edge a large deviations approach to the outage mimo capacity"
    - "information spectrum approach to second order coding rate in channel coding"

Connected through hyperedge HE-4 (induced by source paper "bounds on the second order coding rate of the mimo rayleigh block fading channel"):
  with members:
    - "quasi static simo fading channels at finite blocklength"
    - "diversity versus channel knowledge at finite block length"
    - "low density parity check codes for nonergodic block fading channels"
    - "information spectrum approach to second order coding rate in channel coding"
    - "finite length scaling for iteratively decoded ldpc ensembles"

Connected through hyperedge HE-5 (induced by source paper "dispersion analysis of infinite constellations in ergodic fading channels"):
  with members:
    - "low density lattice codes"

Connected through hyperedge HE-6 (induced by source paper "mutual information of iid complex gaussian signals on block rayleigh faded channels"):
  with members:
    - "optimum pilot overhead in wireless communication a unified treatment of continuous and block fading channels"
    - "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"

Connected through hyperedge HE-7 (induced by source paper "two way relay channels error exponents and resource allocation"):
  with members:
    - "broadcast capacity region of two phase bidirectional relaying"
    - "physical network coding in two way wireless relay channels"

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)