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: "noma an information theoretic perspective"
  Abstract: Non-orthogonal multiple access (NOMA) is a potential enabler for the development of 5G and beyond wireless networks. By allowing multiple users to share the same resource (time/frequency/code/space), NOMA can scale up the number of served users, increase the spectral efficiency, and improve user-fairness compared to existing orthogonal multiple access (OMA) techniques. The basic premise behind NOMA in a single-cell network is to reap the benefits promised by information theory for the downlink and uplink transmission of wireless systems, modeled respectively by the broadcast channel (BC) and multiple access channel (MAC). The capacity regions of the BC and MAC have been established several decades ago, and concurrent non-orthogonal transmission is the optimal transmission strategy in both cases. Unlike the single-cell setting, the capacity region of multi-cell wireless networks, commonly modeled by the interference channel (IC), is in general unknown. However, it is known that OMA is suboptimal. This chapter reviews what information theory promises and proposes for NOMA in single- and multi-cell networks with both single- and multi-antenna nodes. Furthermore, relevant physical layer security channel models are proposed and discussed.

Connected through hyperedge HE-1 (induced by source paper "cognitive radio networks an information theoretic perspective"):
  with members:
    - "non orthogonal multiple access common myths and critical questions"
    - "multi user cognitive interference channels a survey and new capacity results"
    - "massive mimo for next generation wireless systems"
    - "the capacity of less noisy cognitive interference channels"
    - "inner and outer bounds for the gaussian cognitive interference channel and new capacity results"
    - "the capacity of more capable cognitive interference channels"
    - "superposition coding based bounds and capacity for the cognitive z interference channels"
    - "on the capacity of a class of cognitive z interference channels"

Connected through hyperedge HE-2 (induced by source paper "interplay between noma and other emerging technologies a survey"):
  with members:
    - "secure relaying in non orthogonal multiple access trusted and untrusted scenarios"
    - "securing downlink massive mimo noma networks with artificial noise"
    - "lens based millimeter wave reconfigurable antenna noma"
    - "what role can noma play in massive mimo"
    - "joint power and time allocation for noma mec offloading"
    - "multi beam noma for hybrid mmwave systems"
    - "exploiting full half duplex user relaying in noma systems"
    - "energy efficient noma enabled heterogeneous cloud radio access networks"

Connected through hyperedge HE-3 (induced by source paper "minimizing the age of information noma or oma"):
  with members:
    - "minimizing the age of information in a csma environment"
    - "age of information in a network of preemptive servers"
    - "age minimal online policies for energy harvesting sensors with random battery recharges"
    - "the age of updates in a simple relay network"
    - "multicast with prioritized delivery how fresh is your data"
    - "content based status updates"
    - "on the foundation of noma and its application to 5g cellular networks"
    - "age optimal information updates in multihop networks"

Connected through hyperedge HE-4 (induced by source paper "a survey of noma current status and open research challenges"):
  with members:
    - "capacity achieving mimo noma iterative lmmse detection"
    - "fast harq over finite blocklength codes a technique for low latency reliable communication"
    - "on the performance of noma with hybrid arq"
    - "cooperative harq assisted noma scheme in large scale d2d networks"
    - "optimal joint power and subcarrier allocation for full duplex multicarrier non orthogonal multiple access systems"
    - "dynamic user clustering and power allocation for uplink and downlink non orthogonal multiple access noma systems"
    - "a general mimo framework for noma downlink and uplink transmission based on signal alignment"
    - "on block coherence of frames"

Connected through hyperedge HE-5 (induced by source paper "a rotation based method for precoding in gaussian mimome channels"):
  with members:
    - "optimal beamforming for gaussian mimo wiretap channels with two transmit antennas"
    - "optimal signaling for secure communications over gaussian mimo wiretap channels"
    - "an algorithm for global maximization of secrecy rates in gaussian mimo wiretap channels"
    - "full rank solutions for the mimo gaussian wiretap channel with an average power constraint"
    - "cooperative jamming for secure communications in mimo relay networks"
    - "towards the secrecy capacity of the gaussian mimo wire tap channel the 2 2 1 channel"
    - "transmitter optimization for achieving secrecy capacity in gaussian mimo wiretap channels"
    - "the secrecy capacity of the mimo wiretap channel"

Connected through hyperedge HE-6 (induced by source paper "resource allocation in noma based fog radio access networks"):
  with members:
    - "secure communications in noma system subcarrier assignment and power allocation"
    - "fog radio access networks mobility management interference mitigation and resource optimization"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"

Connected through hyperedge HE-7 (induced by source paper "power and channel allocation for non orthogonal multiple access in 5g systems tractability and computation"):
  with members:
    - "optimal joint power and subcarrier allocation for mc noma systems"
    - "fairness for non orthogonal multiple access in 5g systems"
    - "uplink non orthogonal multiple access for 5g wireless networks"
    - "what will 5g be"
    - "on the performance of non orthogonal multiple access in 5g systems with randomly deployed users"
    - "on the complexity of joint subcarrier and power allocation for multi user ofdma systems"
    - "on tractability aspects of optimal resource allocation in ofdma systems"
    - "gaussian interference channel capacity to within one bit"

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)