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: "transmit optimization with improper gaussian signaling for interference channels"
  Abstract: This paper studies the achievable rates of Gaussian interference channels with additive white Gaussian noise (AWGN), when improper or circularly asymmetric complex Gaussian signaling is applied. For the Gaussian multiple-input multiple-output interference channel (MIMO-IC) with the interference treated as Gaussian noise, we show that the user's achievable rate can be expressed as a summation of the rate achievable by the conventional proper or circularly symmetric complex Gaussian signaling in terms of the users' transmit covariance matrices, and an additional term, which is a function of both the users' transmit covariance and pseudo-covariance matrices. The additional degrees of freedom in the pseudo-covariance matrix, which is conventionally set to be zero for the case of proper Gaussian signaling, provide an opportunity to further improve the achievable rates of Gaussian MIMO-ICs by employing improper Gaussian signaling. To this end, this paper proposes widely linear precoding, which efficiently maps proper information-bearing signals to improper transmitted signals at each transmitter for any given pair of transmit covariance and pseudo-covariance matrices. In particular, for the case of two-user Gaussian single-input single-output interference channel (SISO-IC), we propose a joint covariance and pseudo-covariance optimization algorithm with improper Gaussian signaling to achieve the Pareto-optimal rates. By utilizing the separable structure of the achievable rate expression, an alternative algorithm with separate covariance and pseudo-covariance optimization is also proposed, which guarantees the rate improvement over conventional proper Gaussian signaling.

Connected through hyperedge HE-1 (induced by source paper "two user simo interference channel with tin improper signaling versus time sharing"):
  with members:
    - "mixed monotonic programming for fast global optimization"
    - "improper signaling versus time sharing in the two user gaussian interference channel with tin"
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-2 (induced by source paper "a high diversity transceiver design for k user miso broadcast channels"):
  with members:
    - "beam design and user scheduling for nonorthogonal multiple access with multiple antennas based on pareto optimality"
    - "rate splitting multiple access for downlink communication systems bridging generalizing and outperforming sdma and noma"
    - "a generalized zero forcing precoder with successive dirty paper coding in miso broadcast channels"
    - "a minorization maximization method for optimizing sum rate in the downlink of non orthogonal multiple access systems"
    - "non orthogonal multiple access noma for downlink multiuser mimo systems user clustering beamforming and power allocation"
    - "the application of mimo to non orthogonal multiple access"
    - "a new approach to user scheduling in massive multi user mimo broadcast channels"
    - "network mimo with linear zero forcing beamforming large system analysis impact of channel estimation and reduced complexity scheduling"

Connected through hyperedge HE-3 (induced by source paper "improper signaling versus time sharing in the two user gaussian interference channel with tin"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "achieving global optimality for weighted sum rate maximization in the k user gaussian interference channel with multiple antennas"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"
    - "capacity bounds for the gaussian interference channel"
    - "mapel achieving global optimality for a non convex wireless power control problem"

Connected through hyperedge HE-4 (induced by source paper "on the efficiency of widely linear precoding and symbol extension in cellular uplink"):
  with members:
    - "harvesting the self interference in heterogeneous full duplex networks for joint rate energy optimization"
    - "approximate capacity region of the mac ic mac"
    - "improper signaling and symbol extensions how far can we go with gaussian p2p codebooks in the interfering mac with tin"
    - "enabling the multi user generalized degrees of freedom in the gaussian cellular channel"
    - "interference alignment and neutralization in a cognitive 3 user mac interference channel degrees of freedom"

Connected through hyperedge HE-5 (induced by source paper "full duplex relaying with improper gaussian signaling over nakagami m fading channels"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "improper gaussian signaling in full duplex relay channels with residual self interference"
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "spectrum sharing opportunities of full duplex systems using improper gaussian signaling"
    - "benefits of improper signaling for underlay cognitive radio"
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "in band full duplex wireless challenges and opportunities"

Connected through hyperedge HE-6 (induced by source paper "improper gaussian signaling for multiple access channels in underlay cognitive radio"):
  with members:
    - "rate region boundary of the siso z interference channel with improper signaling"
    - "improper gaussian signaling in full duplex relay channels with residual self interference"
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "benefits of improper signaling for underlay cognitive radio"
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "on ergodic sum capacity of fading cognitive multiple access and broadcast channels"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-7 (induced by source paper "rate region boundary of the siso z interference channel with improper signaling"):
  with members:
    - "benefits of improper signaling for underlay cognitive radio"
    - "improper signaling for symbol error rate minimization in k user interference channel"
    - "joint transmitter and receiver optimization for improper complex second order stationary data sequence"
    - "optimized transmission with improper gaussian signaling in the k user miso interference channel"
    - "complex valued random vectors and channels entropy divergence and capacity"
    - "interference alignment with asymmetric complex signaling settling the host madsen nosratinia conjecture"

Connected through hyperedge HE-8 (induced by source paper "improper signaling for virtual full duplex relay systems"):
  with members:
    - "underlay spectrum sharing techniques with in band full duplex systems using improper gaussian signaling"
    - "improper signaling in two path relay channels"
    - "in band full duplex wireless challenges and opportunities"

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)