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: "energy efficiency of distributed signal processing in wireless networks a cross layer analysis"
  Abstract: In order to meet the growing mobile data demand, future wireless networks will be equipped with a mulitude of access points (APs). Besides the important implications for the energy consumption, the trend towards densification requires the development of decentralized and sustainable radio resource management techniques. It is critically important to understand how the distribution of signal processing operations affects the energy efficiency of wireless networks. In this paper, we provide a cross-layer framework to evaluate and compare the energy efficiency of wireless networks under different levels of distribution of the signal processing load: 1) hybrid, where the signal processing operations are shared between nodes and APs; 2) centralized, where signal processing is entirely implemented at the APs; and 3) fully distributed, where all operations are performed by the nodes. We find that in practical wireless networks, hybrid signal processing exhibits a significant energy efficiency gain over both centralized and fully distributed approaches.

Connected through hyperedge HE-1 (induced by source paper "downlink non orthogonal multiple access noma in poisson networks"):
  with members:
    - "modeling and analysis of cellular networks using stochastic geometry a tutorial"
    - "on optimal power allocation for downlink non orthogonal multiple access systems"
    - "noma principles and recent results"
    - "nonorthogonal multiple access in large scale underlay cognitive radio networks"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "cooperative non orthogonal multiple access with simultaneous wireless information and power transfer"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "stochastic geometry modeling of cellular networks analysis simulation and experimental validation"

Connected through hyperedge HE-2 (induced by source paper "meta distribution of the sir in large scale uplink and downlink noma networks"):
  with members:
    - "ultra reliable and low latency wireless communication tail risk and scale"
    - "heterogeneous networks with power domain noma coverage throughput and power allocation analysis"
    - "non orthogonal multiple access in large scale heterogeneous networks"
    - "the meta distribution of the sir for cellular networks with power control"
    - "user point processes in cellular networks"
    - "modeling and performance analysis of clustered device to device networks"
    - "the meta distribution of the sir in poisson bipolar and cellular networks"
    - "fairness for non orthogonal multiple access in 5g systems"

Connected through hyperedge HE-3 (induced by source paper "accuracy of distance based ranking of users in the analysis of noma systems"):
  with members:
    - "downlink non orthogonal multiple access noma in poisson networks"
    - "system level modeling and optimization of the energy efficiency in cellular networks a stochastic geometry framework"
    - "cooperative harq assisted noma scheme in large scale d2d networks"
    - "the meta distribution of the sir for cellular networks with power control"
    - "user point processes in cellular networks"
    - "a general mimo framework for noma downlink and uplink transmission based on signal alignment"
    - "downlink capacity and base station density in cellular networks"

Connected through hyperedge HE-4 (induced by source paper "resource optimization with load coupling in multi cell noma"):
  with members:
    - "a robust machine learning method for cell load approximation in wireless networks"
    - "a framework for optimizing multi cell noma delivering demand with less resource"
    - "on optimal power allocation for downlink non orthogonal multiple access systems"
    - "energy aware wireless relay selection in load coupled ofdma cellular networks"
    - "sub channel assignment power allocation and user scheduling for non orthogonal multiple access networks"
    - "load optimization with user association in cooperative and load coupled lte networks"
    - "elementary properties of positive concave mappings with applications to network planning and optimization"
    - "power and channel allocation for non orthogonal multiple access in 5g systems tractability and computation"

Connected through hyperedge HE-5 (induced by source paper "resource optimization in multi cell noma"):
  with members:
    - "a framework for optimizing multi cell noma delivering demand with less resource"
    - "on optimal power allocation for downlink non orthogonal multiple access systems"
    - "energy aware wireless relay selection in load coupled ofdma cellular networks"
    - "load optimization with user association in cooperative and load coupled lte networks"
    - "elementary properties of positive concave mappings with applications to network planning and optimization"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"
    - "power and load coupling in cellular networks for energy optimization"
    - "optimal cell clustering and activation for energy saving in load coupled wireless networks"

Connected through hyperedge HE-6 (induced by source paper "on energy efficient uplink multi user mimo with shared lna control"):
  with members:
    - "uplink performance of wideband massive mimo with one bit adcs"
    - "downlink achievable rate analysis in massive mimo systems with one bit dacs"
    - "mixed adc massive mimo detectors performance analysis and design optimization"
    - "cell free massive mimo uniformly great service for everyone"
    - "capacity analysis of one bit quantized mimo systems with transmitter channel state information"
    - "large scale mimo versus network mimo for multicell interference mitigation"
    - "what will 5g be"
    - "asymptotic rate analysis of downlink multi user systems with co located and distributed antennas"

Connected through hyperedge HE-7 (induced by source paper "a framework for optimizing multi cell noma delivering demand with less resource"):
  with members:
    - "energy aware wireless relay selection in load coupled ofdma cellular networks"
    - "load optimization with user association in cooperative and load coupled lte networks"
    - "non orthogonal multiple access in multi cell networks theory performance and practical challenges"
    - "optimal cell clustering and activation for energy saving in load coupled wireless networks"
    - "analysis of cell load coupling for lte network planning and optimization"

Connected through hyperedge HE-8 (induced by source paper "modeling and analysis of uplink non orthogonal multiple access noma in large scale cellular networks using poisson cluster processes"):
  with members:
    - "fundamentals of cluster centric content placement in cache enabled device to device networks"
    - "non orthogonal multiple access noma in cellular uplink and downlink challenges and enabling techniques"
    - "modeling and performance analysis of clustered device to device networks"
    - "cooperative non orthogonal multiple access with simultaneous wireless information and power transfer"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "on stochastic geometry modeling of cellular uplink transmission with truncated channel inversion power control"
    - "interference statistics and capacity analysis for uplink transmission in two tier small cell networks a geometric probability approach"
    - "characterizing spatial patterns of base stations in cellular 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)