Analysis of the Impact of Impulsive Noise Parameters on BER Performance of OFDM Power-Line Communications

It is well known that asynchronous impulsive noise is the main source of distortion that drastically affects the power-line communications (PLC) performance. Recently, more realistic models have been proposed in the literature which better fit the physical properties of real impulsive noise. In this paper, we consider a pulse train model and propose a thorough analysis of the impact of impulsive noise parameters, namely impulse width and amplitude as well as inter-arrival time, on the bit error rate (BER) performance of orthogonal frequency division multiplexing (OFDM) broadband PLC. A comparison with the conventional Bernoulli-Gaussian (BG) impulsive noise model exhibits the difference between the two approaches, showing the necessity of more realistic models.Comment: The 7th International Symposium on Signal, Image, Video and Communications (ISIVC 2014) , Nov 2014, Marrakech, Morocc

Combined Source and Channel Strategies for Optimized Video Communications

ISBN 978-953-7619-70-

Etude de la transmission de données par modulation DMT sur le réseau électrique

- Nous proposons dans cet article d'étudier les performances d'une transmission Multi-porteuses (DMT) de données en INDOOR, sur les lignes électriques (connu sous le nom générique de PLC : Power Line Communication). La bande de fréquence utile est de quelques dizaines de Mhz Les résultats seront donnés en terme de débits (Mbit/s) en fonction de la puissance transmise (quelques microwatts). Le schéma de transmission utilisé est proche de celui de l'ADSL

Extending Coverage of High Definition TV Services over ADSL2 with Optimized Reception Quality using H.264/AVC Transrating

In this paper, we present a new Joint Source-Channel Coding (JSCC) architecture to extend the coverage of H.264/AVC High Definition (HD) video delivery over Digital Subscriber Line (DSL). The proposed solution combines low complexity H.264/AVC transrating as well as multi-carrier transmission and takes into account realistic ADSL2 specifications including all OSI layers. Both transrating and bit and power loading transmission parameters are automatically optimized in terms of end-user perceived quality, with respect to the characteristics of the given subscriber’s loop. Several originalities have been included: a new optimization algorithm has been developed, as well as a full rate-distortion modelling of the H.264/AVC transrater’s performances. Simulation results show that the proposed solution can extend the coverage area of HD video delivery up to more than one kilometre. It should allow the widespread distribution of HD video contents and increase the number of eligible subscribers.ADSL2, H.264/AVC, joint source channel coding, transrating, Quality of Experience (QoE

Présentation d’un Kit pédagogique complet pour l’enseignement des transmissions sur fibre optique.

L’objectif ultime est d’initier les étudiants à l’utilisation du réflectomètre optique pour caractériser et qualifier au regard des normes actuelles les transmissions sur fibres optiques. La démarche pédagogique, ici décrite, repose sur l’aspect connaissance de base puis sur la compréhension du réflectomètre. Nous avons créé un kit complet sur mesure composé d’un Cours avec des TD associés, d’une série de 3 TPs complémentaires, d’une vidéo (reportage de 45mn), et d’un ouvrage de référence. L’interaction entre les éléments de ce kit est présentée

JND-guided perceptual pre-filtering for HEVC compression of UHDTV video contents

International audienc

JND-guided perceptual pre-filtering for HEVC compression of UHDTV video contents

International audienc

Performance assessment of the adaptive GoP-size extension of the wireless softCast video scheme

Due to the current events related to Covid-19, the conference originally planned for July 2020 has been postponed to April 7-9, 2021. The conference will be organized virtually by videoconference. ORALInternational audienceThe SoftCast video transmission scheme has been proposed as a promising alternative to traditional video broadcasting systems in wireless error-prone environments. However, in its original form, the scheme may introduce annoying artifacts such as temporal quality variations or the so-called ghost effect. To eliminate this artifact as well as improving the received quality, we recently proposed an updated version of SoftCast: Adaptive GoP-size mechanism based on Content and Cut detection for SoftCast (AGCC-SoftCast) [1]. In this paper, we provide additional results and verify the validity of the algorithm considering different video content and resolution. We also analyze the behaviors of the scheme considering different type of cuts: 1) Abrupt cuts i.e., a cut that appear between two different scenes, 2) Soft cuts that may appear in a same scene and 3) Intraframe cuts that represents a shot change inside a limited portion of the frame. The performance of AGCC-SoftCast are compared to the original SoftCast scheme under different Channel Signal-to-Noise Ratios (CSNR) and Compression Ratios (CR). Traditional objective metrics are considered such as: the Peak Signal-to-Noise Ratio (PSNR), the Structural SIMilarity (SSIM) and the Multi-Scale SSIM (MS-SSIM). In addition, the recent Video Multi-method Assessment Fusion (VMAF) metric proposed by Netflix is also used. Regardless of the CSNR and CR values, results clearly highlight the importance of the AGCC algorithm in a SoftCast wireless video transmission scheme. Depending on the transmitted video content, results show that improvements up to 11.6dB in terms of PSNR and 67.45 in terms of VMAF can be obtained, especially at the cut boundaries