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: "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
  Abstract: This paper studies the achievable degrees of freedom (DoF) for multi-user multiple-input multiple-output (MIMO) two-way relay channels, where there are    $K$    source nodes, each equipped with    $M$    antennas, one relay node, equipped with    $N$    antennas, and each source node exchanges independent messages with an arbitrary set of other source nodes via the relay. By allowing an arbitrary information exchange pattern, the considered channel model is a unified one. It includes several existing channel models as special cases: 1)    $K$   -user MIMO    $Y$    channel; 2) multi-pair MIMO two-way relay channel; 3) generalized MIMO two-way X relay channel; and 4)    $L$   -cluster MIMO multiway relay channel. Previous studies mainly considered the achievability of the DoF cut-set bound    $2N$    at the antenna configuration    $N   by applying signal alignment for network coding. This paper aims to investigate the achievability of the DoF cut-set bound    $KM$    for the case    $N\geq 2M$   . To this end, we first derive tighter DoF upper bounds for three special cases of the considered channel model. Then, we propose a new transmission framework, generalized signal alignment (GSA), to approach these bounds. The notion of GSA is to form network-coded symbols by aligning every pair of signals to be exchanged in a compressed subspace at the relay. A necessary and sufficient condition to construct the relay compression matrix is given. We show that using GSA, the new DoF upper bound is achievable when: 1)    $\frac {N}{M} \in \big (0, 2+\frac {4}{K(K-1)}\big ] \cup \big [K-2, +\infty \big)$    for the    $K$   -user MIMO Y channel; 2)    $\frac {N}{M} \in \big (0, 2+\frac {4}{K}\big ] \cup \big [K-2, +\infty \big)$    for the multi-pair MIMO two-way relay channel; and 3)    $\frac {N}{M} \in \big (0, 2+\frac {8}{K^{2}}\big ] \cup \big [K-2, +\infty \big)$    for the generalized MIMO two-way X relay channel. We also provide the antenna configuration regions for the general multi-user MIMO two-way relay channel to achieve the total DoF    $KM$   .

Connected through hyperedge HE-1 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-2 (induced by source paper "on the degrees of freedom of the symmetric multi relay mimo y channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-3 (induced by source paper "fundamental storage latency tradeoff in cache aided mimo interference networks"):
  with members:
    - "fog aided wireless networks for content delivery fundamental latency tradeoffs"
    - "fundamental tradeoff between storage and latency in cache aided wireless interference networks"
    - "degrees of freedom of cache aided wireless interference networks"
    - "fundamental limits of cache aided interference management"
    - "wireless caching technical misconceptions and business barriers"
    - "the three primary colors of mobile systems"
    - "cooperative tx rx caching in interference channels a storage latency tradeoff study"
    - "cloud and cache aided wireless networks fundamental latency trade offs"

Connected through hyperedge HE-4 (induced by source paper "maximizing data rate for multiway relay channels with pairwise transmission strategy"):
  with members:
    - "on the achievable rates of pairwise multiway relay channels"
    - "a novel user pairing scheme for functional decode and forward multi way relay network"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "degrees of freedom for the mimo multi way relay channel"
    - "on the equal rate capacity of the awgn multiway relay channel"
    - "the capacity region of multiway relay channels over finite fields with full data exchange"
    - "an optimal coding strategy for the binary multi way relay channel"
    - "the multi way relay channel"

Connected through hyperedge HE-5 (induced by source paper "optimal degrees of freedom region for the asymmetric mimo y channel"):
  with members:
    - "optimal dof region for the asymmetric two pair mimo two way relay channel"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-6 (induced by source paper "degrees of freedom of the symmetric multi relay mimo y channel"):
  with members:
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "approximate sum capacity of the y channel"
    - "degrees of freedom for the mimo multi way relay channel"
    - "degrees of freedom for mimo two way x relay channel"
    - "multiple input multiple output two way relaying a space division approach"

Connected through hyperedge HE-7 (induced by source paper "a new dof upper bound and its achievability for k user mimo y channels"):
  with members:
    - "generalized signal alignment for mimo two way x relay channels"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "the degrees of freedom of the mimo y channel"

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)