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: "beamforming for miso interference channels with qos and rf energy transfer"
  Abstract: We consider a multiuser multiple-input single-output interference channel where the receivers are characterized by both quality-of-service (QoS) and radio-frequency (RF) energy harvesting (EH) constraints. We consider the power splitting RF-EH technique where each receiver divides the received signal into two parts a) for information decoding and b) for battery charging. The minimum required power that supports both the QoS and the RF-EH constraints is formulated as an optimization problem that incorporates the transmitted power and the beamforming design at each transmitter as well as the power splitting ratio at each receiver. We consider both the cases of fixed beamforming and when the beamforming design is incorporated into the optimization problem. For fixed beamforming we study three standard beamforming schemes, the zero-forcing (ZF), the regularized zero-forcing (RZF) and the maximum ratio transmission (MRT); a hybrid scheme, MRT-ZF, comprised of a linear combination of MRT and ZF beamforming is also examined. The optimal solution for ZF beamforming is derived in closed-form, while optimization algorithms based on second-order cone programming are developed for MRT, RZF and MRT-ZF beamforming to solve the problem. In addition, the joint-optimization of beamforming and power allocation is studied using semidefinite programming (SDP) with the aid of rank relaxation.

Connected through hyperedge HE-1 (induced by source paper "specific absorption rate aware beamforming in miso downlink swipt systems"):
  with members:
    - "signal and system design for wireless power transfer prototype experiment and validation"
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "a learning approach to wireless information and power transfer signal and system design"
    - "wireless information and power transfer over an awgn channel nonlinearity and asymmetric gaussian signaling"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "waveform design for wireless power transfer"
    - "wireless information and power transfer nonlinearity waveform design and rate energy tradeoff"
    - "safe and secure wireless power transfer networks challenges and opportunities in rf based systems"

Connected through hyperedge HE-2 (induced by source paper "ultra small cell networks with collaborative rf and lightwave power transfer"):
  with members:
    - "robust design of ac computing enabled receiver architecture for swipt networks"
    - "fundamentals of wireless information and power transfer from rf energy harvester models to signal and system designs"
    - "green cell less design for rf wireless power transfer networks"
    - "rf wireless power transfer regreening future networks"
    - "coverage and rate analysis for co existing rf vlc downlink cellular networks"
    - "robust resource allocation for mimo wireless powered communication networks based on a non linear eh model"
    - "waveform design for wireless power transfer"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"

Connected through hyperedge HE-3 (induced by source paper "multi tone signal optimization for wireless power transfer in the presence of wireless communication links"):
  with members:
    - "retrodirective multi user wireless power transfer with massive mimo"
    - "low complexity adaptive multisine waveform design for wireless power transfer"
    - "waveform optimization for radio frequency wireless power transfer"
    - "waveform design for wireless power transfer"
    - "waveform optimization for swipt with nonlinear energy harvester modeling"
    - "wireless powered communication opportunities and challenges"
    - "practical non linear energy harvesting model and resource allocation for swipt systems"
    - "multi antenna wireless energy transfer for backscatter communication systems"

Connected through hyperedge HE-4 (induced by source paper "energy sustainable iot with individual qos constraints through miso swipt multicasting"):
  with members:
    - "jointly optimal spatial channel assignment and power allocation for mimo swipt systems"
    - "random access analysis for massive iot networks under a new spatio temporal model a stochastic geometry approach"
    - "robust an aided beamforming and power splitting design for secure miso cognitive radio with swipt"
    - "power allocation and scheduling for swipt systems with non linear energy harvesting model"
    - "joint beamforming design for multi user wireless information and power transfer"
    - "multiuser miso beamforming for simultaneous wireless information and power transfer"
    - "joint transmit beamforming and receive power splitting for miso swipt systems"
    - "robust beamforming for wireless information and power transmission"

Connected through hyperedge HE-5 (induced by source paper "joint offloading and computing optimization in wireless powered mobile edge computing systems"):
  with members:
    - "distributed wireless power transfer with energy feedback"
    - "reel bf design achieving the sdp bound for downlink beamforming with arbitrary shaping constraints"
    - "delay optimal computation task scheduling for mobile edge computing systems"
    - "waveform design for wireless power transfer"
    - "energy efficient resource allocation for mobile edge computation offloading"
    - "a general design framework for mimo wireless energy transfer with limited feedback"
    - "communications and signals design for wireless power transmission"
    - "wireless powered communication opportunities and challenges"

Connected through hyperedge HE-6 (induced by source paper "decentralized robust transceiver designs for miso swipt interference channel"):
  with members:
    - "reel bf design achieving the sdp bound for downlink beamforming with arbitrary shaping constraints"
    - "joint optimization of power and data transfer in multiuser mimo systems"
    - "robust transceiver design for miso interference channel with energy harvesting"
    - "communications and signals design for wireless power transmission"
    - "joint transceiver design algorithms for multiuser miso relay systems with energy harvesting"
    - "energy harvesting wireless communications a review of recent advances"
    - "robust beamforming for secure communication in systems with wireless information and power transfer"
    - "simultaneous wireless information and power transfer in modern communication systems"

Connected through hyperedge HE-7 (induced by source paper "battery powered devices in wpcns"):
  with members:
    - "optimal energy and data routing in networks with energy cooperation"
    - "wireless power meets energy harvesting a joint energy allocation approach in ofdm based system"
    - "decentralized transmission policies for energy harvesting devices"
    - "on the effects of battery imperfections in an energy harvesting device"
    - "achievable secrecy rates of an energy harvesting device"
    - "wireless powered communication opportunities and challenges"
    - "optimal adaptive random multiaccess in energy harvesting wireless sensor networks"
    - "energy harvesting wireless communications a review of recent advances"

Connected through hyperedge HE-8 (induced by source paper "on optimal policies in full duplex wireless powered communication networks"):
  with members:
    - "optimization of energy constrained wireless powered communication networks with heterogeneous nodes"
    - "battery powered devices in wpcns"
    - "wireless powered communication opportunities and challenges"
    - "energy harvesting networks with energy cooperation procrastinating policies"
    - "throughput optimization for massive mimo systems powered by wireless energy transfer"
    - "joint transmission and energy transfer policies for energy harvesting devices with finite batteries"
    - "harvest then cooperate wireless powered cooperative communications"
    - "stability and performance issues of a relay assisted multiple access scheme with mpr capabilities"

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)