Conservative cascades: an invariant of Internet traffic

Conservative cascades are among the class of multiscaling processes that accommodate the two competing objectives of deterministic and random cascades. This paper discusses in what sense the cascade model can be seen as an invariant of the Internet traffic. It explains why conservative cascades model the time-invariant properties of the Internet traffic at timescales up to hundreds of milliseconds. Furthermore, it shows the limitations of the conservative cascades to model part of the time-dependent scaling properties of Internet traffic.Anglai

On Loss Functions for Supervised Monaural Time-Domain Speech Enhancement

Audio samples related to the experiments conducted in the paper M. Kolbæk et al. “On Loss Functions for Supervised Monaural Time-Domain Speech Enhancement” 2019 (https://arxiv.org/abs/1909.01019

Gabor Expansion for Simultaneous Wireless Power and Information Transfer (SWIPT): Interference Analysis

Wireless power transfer (WPT) has recently appealed the research community. One application for such technology is powering up future IoT devices and sensors. This article proposes a setup where both WPT and information transfer (IT) coexist sharing the same time and frequency resources in a flexible manner while keeping the interference at a low level. The interference of WPT on IT is analyzed as a performance metric for the proposed scheme. In particular, the influence of WPT side lobes on the main lobes of the information signal is computed to assess its impact on the performance of IT. The proposed scheme uses a Gabor expansion to create both power and information signals. This structure enables to assign resources for energy and information dynamically on the time-frequency lattice providing a high flexibility in the system. We propose to use the Gaussian basis functions to create the WPT signal since they are well localized both in time and in frequency, therefore creating the lowest possible interference on the nearby subcarriers. Hence, any multi-carrier system with different modulation schemes can be used for IT in the allowed time-frequency grid such as CP-OFDM and FBMC-OQAM. The expressions of interference are computed and simulation results show the low level of interference created by the power signal on the information signals which validates the possible coexistence of both systems

Goodput optimized bit and power allocation for OFDM transmission with relaying

This paper considers point to point transmission over frequency selective channels by means of OFDM (orthogonal frequency division multiplexing), and enhanced by means of a decode-and-forward (DAF) relay. Assuming that perfect channel state information is available at the transmission side, this paper intends to solve the problems of power and bit allocation for goodput maximization. A greedy approach is proposed where the number of bits to be allocated is increased one at a time till a maximum value of the goodput is reached. The performance of the algorithm is illustrated with simulations, and compared with uniform power allocation and waterfilling approaches.Anglai

Algorithms for Reconstruction of Undersampled Atomic Force Microscopy Images Supplementary Material

Two Jupyter Notebooks showcasing reconstructions of undersampled atomic force microscopy images. The reconstructions were obtained using a variety of interpolation and reconstruction methods.Two Jupyter Notebooks showcasing reconstructions of undersampled atomic force microscopy images. The reconstructions were obtained using a variety of interpolation and reconstruction methods

Contextual inquiries observations - clinicians assessments of aided performance in three public hearing clinics in Denmark

The data has been collected as a part of a Danish national study on better hearing rehabilitation (BEAR). In this study focus is on how hearing care professionals assess outcome of hearing aid rehabilitation. Data is retrieved from a larger dataset analyzed in NVivo (Nvivo qualitative data analysis Software; QSR International Pty Ltd. Version 12, 2018). The empirical data is collected during contextual inquiries observations and interviews with 17 professionals in three Danish public hearing clinics

Environment Mapping with 28 GHz Beam Steering Transceivers Using the SAGE Algorithm: Preliminary Results

This paper presents a multipath component (MPC) parameter estimator for indoor environment mapping that uses the 28 GHz radio band. It employs a commercial-offthe- shelf (COTS) radio frequency transceiver chipset capable of beam steering within an azimuth angle range of −78o and +78° but with only a single RF chain. Existing spacealternating generalized expectation-maximization (SAGE) algorithms for MPC parameter estimation are designed specifically for multi-antenna systems, with each antenna having its own baseband representation. By exploiting the beam steering characteristics, we adapted the SAGE algorithm to make it suitable for analyzing a single-baseband based multiantenna array system. The anechoic chamber measured array radiation pattern for each steering direction is used in our algorithm to determine the MPC contribution. In an office setting, the transmitter and receiver antenna beams are swept. All backscatter responses are collected for all possible pairs of transmitter/receiver steering angles, and an angular map that contains the power profile is produced. The performance of the proposed algorithm is validated by simulation and measurement data