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 general rate duality of the mimo multiple access channel and the mimo broadcast channel"
  Abstract: We present a general rate duality between the multiple access channel (MAC) and the broadcast channel (BC) which is applicable to systems with and without nonlinear interference cancellation. Different to the state-of-the-art rate duality with interference subtraction from Vishwanath et al., the proposed duality is filter-based instead of covariance-based and exploits the arising unitary degree of freedom to decorrelate every point- to-point link. Therefore, it allows for noncooperative stream-wise decoding which reduces complexity and latency. Moreover, the conversion from one domain to the other does not exhibit any dependencies during its computation making it accessible to a parallel implementation instead of a serial one. We additionally derive a rate duality for systems with multi-antenna terminals when linear filtering without interference (pre-)subtraction is applied and the different streams of a single user are not treated as self-interference. Both dualities are based on a framework already applied to a mean-square-error duality between the MAC and the BC. Thanks to this novel rate duality, any rate-based optimization with linear filtering in the BC can now be handled in the dual MAC where the arising expressions lead to more efficient algorithmic solutions than in the BC due to the alignment of the channel and precoder indices.

Connected through hyperedge HE-1 (induced by source paper "on reciprocity in physically consistent tdd systems with coupled antennas"):
  with members:
    - "reciprocity calibration for massive mimo proposal modeling and validation"
    - "massive mimo for next generation wireless systems"

Connected through hyperedge HE-2 (induced by source paper "qos constrained power minimization in the multiple stream mimo broadcast channel"):
  with members:
    - "qos constrained power minimization in the miso broadcast channel with imperfect csi"
    - "ammse optimization for multiuser miso systems with imperfect csit and perfect csir"
    - "mimo broadcast channels with finite rate feedback"

Connected through hyperedge HE-3 (induced by source paper "sinr constrained beamforming for a mimo multi user downlink system"):
  with members:
    - "linear transceiver design for a mimo interfering broadcast channel achieving max min fairness"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"

Connected through hyperedge HE-4 (induced by source paper "duality polite water filling and optimization for mimo b mac interference networks and itree networks"):
  with members:
    - "sum capacity of interference channels with a local view impact of distributed decisions"
    - "mimo b mac interference network optimization under rate constraints by polite water filling and duality"
    - "multiuser miso transmitter optimization for intercell interference mitigation"
    - "a new outer bound and the noisy interference sum rate capacity for gaussian interference channels"
    - "mimo broadcast channel optimization under general linear constraints"
    - "capacity bounds for the gaussian interference channel"
    - "on gaussian mimo bc mac duality with multiple transmit covariance constraints"
    - "approaching the capacity of wireless networks through distributed interference alignment"

Connected through hyperedge HE-5 (induced by source paper "linear processing and sum throughput in the multiuser mimo downlink"):
  with members:
    - "sum rate maximization using linear precoding and decoding in the multiuser mimo downlink"
    - "mutual information and minimum mean square error in gaussian channels"

Connected through hyperedge HE-6 (induced by source paper "an asymptotic analysis of the mimo bc under linear filtering"):
  with members:
    - "high snr analysis of mimo broadcast 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)