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: "downlink interference alignment"
  Abstract: We develop an interference alignment (IA) technique for a downlink cellular system. In the uplink, IA schemes need channel-state-information exchange across base-stations of different cells, but our downlink IA technique requires feedback only within a cell. As a result, the proposed scheme can be implemented with a few changes to an existing cellular system where the feedback mechanism (within a cell) is already being considered for supporting multi-user MIMO. Not only is our proposed scheme implementable with little effort, it can in fact provide substantial gain especially when interference from a dominant interferer is significantly stronger than the remaining interference: it is shown that in the two-isolated cell layout, our scheme provides four-fold gain in throughput performance over a standard multi-user MIMO technique. We show through simulations that our technique provides respectable gain under a more realistic scenario: it gives approximately 20% gain for a 19 hexagonal wrap-around-cell layout. Furthermore, we show that our scheme has the potential to provide substantial gain for macro-pico cellular networks where pico-users can be significantly interfered with by the nearby macro-BS.

Connected through hyperedge HE-1 (induced by source paper "optimality of treating inter cell interference as noise under finite precision csit"):
  with members:
    - "on the optimality of treating inter cell interference as noise downlink cellular networks and uplink downlink duality"
    - "towards an extremal network theory robust gdof gain of transmitter cooperation over tin"
    - "on the separability of parallel miso broadcast channels under partial csit a degrees of freedom region perspective"
    - "optimality of simple layered superposition coding in the 3 user miso bc with finite precision csit"
    - "on the optimality of treating interference as noise for interfering multiple access channels"
    - "on the optimality of treating inter cell interference as noise in uplink cellular networks"
    - "opportunistic treating interference as noise"
    - "generalized degrees of freedom of the symmetric k user interference channel under finite precision csit"

Connected through hyperedge HE-2 (induced by source paper "simultaneous signal and interference alignment for two cell over the air computation"):
  with members:
    - "machine learning at the wireless edge distributed stochastic gradient descent over the air"
    - "reduced dimension design of mimo over the air computing for data aggregation in clustered iot networks"
    - "a survey on mobile edge computing the communication perspective"
    - "interference alignment for multicell multiuser mimo uplink channels"

Connected through hyperedge HE-3 (induced by source paper "on the optimality of treating inter cell interference as noise downlink cellular networks and uplink downlink duality"):
  with members:
    - "towards an extremal network theory robust gdof gain of transmitter cooperation over tin"
    - "on the optimality of treating interference as noise for interfering multiple access channels"
    - "on the optimality of treating inter cell interference as noise in uplink cellular networks"
    - "opportunistic treating interference as noise"
    - "optimality of treating interference as noise a combinatorial perspective"
    - "on the optimality of treating interference as noise compound interference networks"
    - "on the optimality of treating interference as noise general message sets"
    - "on the optimality of treating interference as noise for k user parallel gaussian interference networks"

Connected through hyperedge HE-4 (induced by source paper "sum rate maximization of multicell miso networks with limited information exchange"):
  with members:
    - "a deep learning framework for optimization of miso downlink beamforming"
    - "opportunistic downlink interference alignment for multi cell mimo networks"
    - "coordinated regularized zero forcing precoding for multicell miso systems with limited feedback"
    - "joint transmission with limited backhaul connectivity"
    - "analysis of massive mimo enabled downlink wireless backhauling for full duplex small cells"
    - "sinr and throughput scaling in ultradense urban cellular networks"
    - "on the spatial degrees of freedom of multicell and multiuser mimo channels"
    - "on feasibility of interference alignment in mimo interference networks"

Connected through hyperedge HE-5 (induced by source paper "on multi cell uplink downlink duality with treating inter cell interference as noise"):
  with members:
    - "on the optimality of treating inter cell interference as noise in uplink cellular networks"
    - "opportunistic treating interference as noise"
    - "optimality of treating interference as noise a combinatorial perspective"
    - "on the optimality of treating interference as noise compound interference networks"
    - "on the optimality of treating interference as noise general message sets"
    - "on the optimality of treating interference as noise for k user parallel gaussian interference networks"

Connected through hyperedge HE-6 (induced by source paper "an overview on resource allocation techniques for multi user mimo systems"):
  with members:
    - "low complexity downlink user selection for massive mimo systems"
    - "alternating minimization algorithms for hybrid precoding in millimeter wave mimo systems"
    - "an overview of signal processing techniques for millimeter wave mimo systems"
    - "user association in 5g networks a survey and an outlook"
    - "cell free massive mimo versus small cells"
    - "mu mimo mac protocols for wireless local area networks a survey"
    - "on the number of rf chains and phase shifters and scheduling design with hybrid analog digital beamforming"
    - "hybrid digital and analog beamforming design for large scale antenna arrays"

Connected through hyperedge HE-7 (induced by source paper "opportunistic downlink interference alignment for multi cell mimo networks"):
  with members:
    - "codebook based opportunistic interference alignment"
    - "opportunistic downlink interference alignment"
    - "on the achievable dof and user scaling law of opportunistic interference alignment in 3 transmitter mimo interference channels"
    - "effect of receive spatial diversity on the degrees of freedom region in multi cell random beamforming"
    - "parallel opportunistic routing in wireless networks"
    - "opportunistic interference alignment for mimo interfering multiple access channels"
    - "multiuser diversity in interfering broadcast channels achievable degrees of freedom and user scaling law"
    - "multi cell random beamforming achievable rate and degrees of freedom region"

Connected through hyperedge HE-8 (induced by source paper "linear degrees of freedom of mimo broadcast channels with reconfigurable antennas in the absence of csit"):
  with members:
    - "fundamental limits of spectrum sharing full duplex multicell networks"
    - "degrees of freedom of full duplex cellular networks with reconfigurable antennas at base station"
    - "real interference alignment exploiting the potential of single antenna systems"
    - "degrees of freedom of uplink downlink multiantenna cellular networks"
    - "on the degrees of freedom of k user siso interference and x channels with delayed csit"
    - "linear degrees of freedom of the mimo x channel with delayed csit"
    - "diophantine approach to blind interference alignment of homogeneous k user 2x1 miso broadcast channels"
    - "a new outer bound via interference localization and the degrees of freedom regions of mimo interference networks with no csit"

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)