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: "diversity of mmse mimo receivers"
  Abstract: In most MIMO systems, the family of waterfall error curves, calculated at different spectral efficiencies, are asymptotically parallel at high SNR. In other words, most MIMO systems exhibit a single diversity value for all fixed rates. The MIMO MMSE receiver does not follow this pattern and exhibits a varying diversity in its family of error curves. This work analyzes this interesting behavior of the MMSE MIMO receiver and produces the MMSE MIMO diversity at all rates. The diversity of the quasi-static flat-fading MIMO channel consisting of any arbitrary number of transmit and receive antennas is fully characterized, showing that full spatial diversity is possible if and only if the rate is within a certain bound which is a function of the number of antennas. For other rates, the available diversity is fully characterized. At sufficiently low rates, the MMSE receiver has a diversity similar to the maximum likelihood receiver (maximal diversity), while at high rates it performs similarly to the zero-forcing receiver (minimal diversity). Linear receivers are also studied in the context of the MIMO multiple access channel (MAC). Then, the quasi-static frequency selective MIMO channel is analyzed under zero-padding (ZP) and cyclic-prefix (CP) block transmissions and MMSE reception, and lower and upper bounds on diversity are derived. For the special case of SIMO under CP, it is shown that the above-mentioned bounds are tight.

Connected through hyperedge HE-1 (induced by source paper "orthogonal precoding for ultra reliable wireless communication links"):
  with members:
    - "performance characterization of a real time massive mimo system with los mobile channels"
    - "low complexity equalization for orthogonal time and frequency signaling otfs"
    - "analysis of discrete time mimo ofdm based orthogonal time frequency space modulation"
    - "low complexity modem structure for ofdm based orthogonal time frequency space modulation"
    - "otfs orthogonal time frequency space"
    - "time and frequency varying k factor of non stationary vehicular channels for safety relevant scenarios"
    - "delay and doppler spreads of nonstationary vehicular channels for safety relevant scenarios"

Connected through hyperedge HE-2 (induced by source paper "integer forcing linear receivers a design criterion for full diversity stbcs"):
  with members:
    - "full diversity unitary precoded integer forcing"
    - "successive integer forcing and its sum rate optimality"
    - "precoded integer forcing universally achieves the mimo capacity to within a constant gap"
    - "on complex lll algorithm for integer forcing linear receivers"
    - "integer forcing mimo linear receivers based on lattice reduction"
    - "integer forcing linear receivers"

Connected through hyperedge HE-3 (induced by source paper "low complexity equalization for orthogonal time and frequency signaling otfs"):
  with members:
    - "otfs orthogonal time frequency space"
    - "delay and doppler spreads of nonstationary vehicular channels for safety relevant scenarios"

Connected through hyperedge HE-4 (induced by source paper "on the joint impact of hardware impairments and imperfect csi on successive decoding"):
  with members:
    - "outage probability of dual hop multiple antenna af systems with linear processing in the presence of co channel interference"
    - "on the mimo capacity with residual transceiver hardware impairments"
    - "performance analysis of the ordered v blast approach over nakagami m fading channels"
    - "exact joint distribution analysis of zero forcing v blast gains with greedy ordering"
    - "mimo transmission with residual transmit rf impairments"
    - "performance analysis of mimo mrc in double correlated rayleigh environments"

Connected through hyperedge HE-5 (induced by source paper "fifty years of mimo detection the road to large scale mimos"):
  with members:
    - "large scale mimo detection for 3gpp lte algorithms and fpga implementations"
    - "an esprit based approach for 2 d localization of incoherently distributed sources in massive mimo systems"
    - "massive mimo for next generation wireless systems"
    - "what will 5g be"
    - "approximate bayesian probabilistic data association aided iterative detection for mimo systems using arbitrary m ary modulation"
    - "channel hardening exploiting message passing chemp receiver in large scale mimo systems"
    - "five disruptive technology directions for 5g"
    - "scaling up mimo opportunities and challenges with very large arrays"

Connected through hyperedge HE-6 (induced by source paper "mimo zero forcing performance evaluation using the holonomic gradient method"):
  with members:
    - "schur complement based analysis of mimo zero forcing for rician fading"
    - "performance analysis of macrodiversity mimo systems with mmse and zf receivers in flat rayleigh fading"
    - "exact mimo zero forcing detection analysis for transmit correlated rician fading"

Connected through hyperedge HE-7 (induced by source paper "diversity of linear transceivers in mimo af half duplex relaying channels"):
  with members:
    - "asymptotic performance of linear receivers in mimo fading channels"
    - "diversity multiplexing tradeoff for the mimo static half duplex relay"
    - "towards the optimal amplify and forward cooperative diversity scheme"
    - "diversity multiplexing tradeoff of double scattering mimo channels"
    - "optimal space time codes for the mimo amplify and forward cooperative channel"

Connected through hyperedge HE-8 (induced by source paper "full diversity space time block codes for integer forcing linear receivers"):
  with members:
    - "successive integer forcing and its sum rate optimality"
    - "precoded integer forcing universally achieves the mimo capacity to within a constant gap"
    - "on complex lll algorithm for integer forcing linear receivers"
    - "integer forcing mimo linear receivers based on lattice reduction"
    - "integer forcing linear receivers"
    - "two designs of space time block codes achieving full diversity with partial interference cancellation group decoding"
    - "on full diversity space time block codes with partial interference cancellation group decoding"

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)