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 framework for designing mimo systems with decision feedback equalization or tomlinson harashima precoding"
  Abstract: We consider joint transceiver design for general Multiple-Input Multiple-Output communication systems that implement interference (pre-)subtraction, such as those based on Decision Feedback Equalization (DFE) or Tomlinson-Harashima precoding (THP). We develop a unified framework for joint transceiver design by considering design criteria that are expressed as functions of the Mean Square Error (MSE) of the individual data streams. By deriving two inequalities that involve the logarithms of the individual MSEs, we obtain optimal designs for two classes of communication objectives, namely those that are Schur-convex and Schur-concave functions of these logarithms. For Schur-convex objectives, the optimal design results in data streams with equal MSEs. This design simultaneously minimizes the total MSE and maximizes the mutual information for the DFE-based model. For Schur-concave objectives, the optimal DFE design results in linear equalization and the optimal THP design results in linear precoding. The proposed framework embraces a wide range of design objectives and can be regarded as a counterpart of the existing framework of linear transceiver design.

Connected through hyperedge HE-1 (induced by source paper "a survey on mimo transmission with discrete input signals technical challenges advances and future trends"):
  with members:
    - "asymptotic performance analysis of a k hop amplify and forward relay mimo channel"
    - "iterative distributed minimum total mse approach for secure communications in mimo interference channels"
    - "asymptotic analysis of su mimo channels with transmitter noise and mismatched joint decoding"
    - "secure massive mimo transmission with an active eavesdropper"
    - "interference aligned space time transmission with diversity for the 2 times 2 x network"
    - "space time encoded miso broadcast channel with outdated csit an error rate and diversity performance analysis"
    - "high snr asymptotics of mutual information for discrete constellations with applications to bicm"
    - "differential distributed space time coding with imperfect synchronization in frequency selective channels"

Connected through hyperedge HE-2 (induced by source paper "practical design for multiple antenna cognitive radio networks with coexistence constraint"):
  with members:
    - "cooperative cognitive networks optimal distributed and low complexity algorithms"
    - "improved transmission strategies for cognitive radio under the coexistence constraint"
    - "inner and outer bounds for the gaussian cognitive interference channel and new capacity results"
    - "optimal and robust transmit designs for miso channel secrecy by semidefinite programming"
    - "cognitive radio with partial channel state information at the transmitter"
    - "exploiting multi antennas for opportunistic spectrum sharing in cognitive radio networks"
    - "cognitive radio an information theoretic perspective"

Connected through hyperedge HE-3 (induced by source paper "matrix monotonic optimization for mimo systems"):
  with members:
    - "a general robust linear transceiver design for multi hop amplify and forward mimo relaying systems"
    - "robust transceiver with tomlinson harashima precoding for amplify and forward mimo relaying systems"
    - "robust transceiver design for af mimo relay systems with column correlations"
    - "transceiver design for dual hop nonregenerative mimo ofdm relay systems under channel uncertainties"

Connected through hyperedge HE-4 (induced by source paper "robust transceiver with tomlinson harashima precoding for amplify and forward mimo relaying systems"):
  with members:
    - "joint robust weighted lmmse transceiver design for dual hop af multiple antenna relay systems"
    - "robust transceiver design for af mimo relay systems with column correlations"
    - "robust linear transceiver design for multi hop non regenerative mimo relaying systems"
    - "transceiver design for dual hop nonregenerative mimo ofdm relay systems under channel uncertainties"

Connected through hyperedge HE-5 (induced by source paper "joint unitary triangularization for mimo networks"):
  with members:
    - "physical layer mimo relaying"
    - "hybrid digital analog codes for source channel broadcast of gaussian sources over gaussian channels"
    - "analog matching of colored sources to colored channels"
    - "robust joint source channel coding for delay limited applications"

Connected through hyperedge HE-6 (induced by source paper "power allocation in two hop amplify and forward mimo relay systems with qos requirements"):
  with members:
    - "a tutorial on the optimization of amplify and forward mimo relay systems"

Connected through hyperedge HE-7 (induced by source paper "a design framework for limited feedback mimo systems with zero forcing dfe"):
  with members:
    - "design of block transceivers with decision feedback detection"

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)