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: "multi user transmissions for relay networks with linear complexity"
  Abstract: This paper considers transmission and detection schemes in a (J, R, N) multi-access relay network (MARN), where J single-antenna source nodes send independent messages to one N-antenna destination node through one R-antenna relay node. For complexity considerations, the network is under two linear constraints. The relay node linearly maps its received signals to generate the forwarded signals without decoding and the destination node has linear decoding complexity in the number of users. We propose two protocols to allow multi-user concurrent transmission in the network. Using distributed space-time coding (DSTC) at the relay and zero-forcing interference cancellation (IC) at the receiver, the protocol of DSTC-ICRec allows concurrent transmission in both the source-relay link and the relay-receiver link. When J = 2J-1, TDMA-ICRec achieves the maximum interference-free (int-free) diversity of R, at a lower symbol rate compared to DSTC-ICRec.

Connected through hyperedge HE-1 (induced by source paper "interference cancellation at the relay for multi user wireless cooperative networks"):
  with members:
    - "performance analysis of multiple antenna multi user detection"
    - "power bandwidth tradeoff in dense multi antenna relay networks"

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)