human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "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    $KM$   .

Includes members:
  Member "a new dof upper bound and its achievability for k user mimo y channels":
    also connected through other hyperedges:
      (none)
  Member "generalized signal alignment for mimo two way x relay channels":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "mimo multiway distributed relay channel with full data exchange an achievable rate perspective")
  Member "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel")
  Member "beyond one way communication degrees of freedom of multi way relay mimo interference networks":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "degrees of freedom of the mimo three way channel with node intermittency")
  Member "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "degrees of freedom of the mimo three way channel with node intermittency")
  Member "generalized signal alignment for arbitrary mimo two way relay channels":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel")
  Member "degrees of freedom for the mimo multi way relay channel":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "degrees of freedom of the mimo three way channel with node intermittency")
  Member "the degrees of freedom of the mimo y channel":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel")

Question: Please tell me which class the source paper 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)