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: "distributed power allocation strategies for parallel relay networks"
  Abstract: We consider a source-destination pair assisted by parallel regenerative decode-and-forward relays operating in orthogonal channels. We investigate distributed power allocation strategies for this system with limited channel state information at the source and the relay nodes. We first propose a distributed decision mechanism for each relay to individually make its decision on whether to forward the source data. The decision mechanism calls for each relay that is able to decode the information from the source to compare its relay-to-destination channel gain with a given threshold. We identify the optimum distributed power allocation strategy that minimizes the total transmit power while providing a target signal-to-noise ratio at the destination with a target outage probability. The strategy dictates the optimum choices for the source power as well as the threshold value at the relays. Next, we consider two simpler distributed power allocation strategies, namely the passive source model where the source power and the relay threshold are fixed, and the single relay model where only one relay is allowed to forward the source data. These models are motivated by limitations on the available channel state information as well as ease of implementation as compared to the optimum distributed strategy. Simulation results are presented to demonstrate the performance of the proposed distributed power allocation schemes. Specifically, we observe significant power savings with proposed methods as compared to random relay selection.

Connected through hyperedge HE-1 (induced by source paper "on the performance of the relay arq networks"):
  with members:
    - "green communication via power optimized harq protocols"
    - "green communication via type i arq finite block length analysis"
    - "lecture notes on network information theory"

Connected through hyperedge HE-2 (induced by source paper "energy efficient cooperative network coding with joint relay scheduling and power allocation"):
  with members:
    - "wireless information and power transfer energy efficiency optimization in ofdma systems"
    - "energy efficient precoding for multiple antenna terminals"
    - "relay selection with network coding in two way relay channels"

Connected through hyperedge HE-3 (induced by source paper "power control and soft topology adaptations in multihop cellular networks with multi point connectivity"):
  with members:
    - "two birds and one stone gaussian interference channel with a shared out of band relay of limited rate"
    - "uplink multicell processing with limited backhaul via per base station successive interference cancellation"
    - "symmetric capacity of the gaussian interference channel with an out of band relay to within 1 15 bits"
    - "interference channel with an out of band relay"
    - "gaussian interference channel capacity to within one bit"

Connected through hyperedge HE-4 (induced by source paper "alternating optimization techniques for power allocation and receiver design in multihop wireless sensor networks"):
  with members:
    - "joint iterative power allocation and linear interference suppression algorithms in cooperative ds cdma networks"
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "adaptive alternating minimization algorithms"

Connected through hyperedge HE-5 (induced by source paper "adaptive power allocation strategies using dstc in cooperative mimo networks"):
  with members:
    - "adaptive distributed space time coding based on adjustable code matrices for cooperative mimo relaying systems"
    - "adaptive alternating minimization algorithms"

Connected through hyperedge HE-6 (induced by source paper "power allocation and pricing in multi user relay networks using stackelberg and bargaining games"):
  with members:
    - "interference cancellation at the relay for multi user wireless cooperative networks"
    - "multisource transmission for wireless relay networks with linear complexity"
    - "network beamforming using relays with perfect channel information"
    - "relay assisted f tdma ad hoc networks node classification power allocation and relaying strategies"

Connected through hyperedge HE-7 (induced by source paper "energy efficient relaying over multiple slots with causal csi"):
  with members:
    - "on the monotonicity log concavity and tight bounds of the generalized marcum and nuttall q functions"
    - "asymptotically optimal policies for hard deadline scheduling over fading channels"
    - "energy efficient scheduling of delay constrained traffic over fading channels"

Connected through hyperedge HE-8 (induced by source paper "precoder design for multi antenna partial decode and forward pdf cooperative systems with statistical csit and mmse sic receivers"):
  with members:
    - "grassmannian beamforming for mimo amplify and forward relaying"

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)