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Article de conférence

Division réseau équitable dans les essaims de nanosatellites

Auteurs : Akopyan Evelyne, Dhaou Riadh, Lochin Emmanuel, Pontet Bernard et Sombrin Jacques B.

In Proc. 26èmes Rencontres Francophones sur les Aspects Algorithmiques des Téléommunications (AlgoTel-CoRes), Saint-Briac-sur-Mer, France, May 27-31, 2024.

Nous proposons de partitionner l’architecture d’un réseau ad-hoc mobile en plusieurs groupes, afin de re-distribuer équitablement la charge entre les membres du réseau. Notre étude porte sur un essaim de nanosatellites fonctionnant comme un télescope spatial distribué, placé en orbite lunaire. Chaque nanosatellite de l’essaim collecte des données d’observation de l’espace, puis les échange avec les autres membres de l’essaim. Les données recueillies sont ensuite combinées localement afin de produire l’image globale observée par l’essaim. Cependant, un système fondé sur ce mode opératoire est particulièrement sensible aux pertes de paquets et aux pannes d’énergie. En effet, la transmission simultanée d’un important volume de données peut entraîner des problèmes de communication, notamment en surchargeant le canal radio ou en augmentant le risque de collisions, menant dans les deux cas `a des pertes de paquets. La consommation énergétique totale de l’essaim est également proportionnelle au nombre de paquets transmis : il faut alors trouver une solution pour limiter le nombre de transmissions afin d’économiser l’énergie des nanosatellites. La principale contribution de ce papier est de proposer une approche basée sur la division équitable du réseau en plusieurs groupes de nanosatellites. Nous comparons les performances de trois algorithmes de division de graphe : Random Node Division (RND), Multiple Independent Random Walks (MIRW), et Forest Fire Division (FFD). Nos résultats montrent que MIRW obtient les meilleurs scores en termes d’équité, peu importe le nombre de groupes produit.

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Réseaux / Systèmes spatiaux de communication

Scalable Syndrome-based Neural Decoders for Bit-Interleaved Coded Modulations

Auteurs : De Boni Rovella Gastón, Benammar Meryem, Benaddi Tarik et Meric Hugo

In Proc. IEEE International Conference on Machine Learning for Communication and Networking (ICMLCN 2024), Stockholm, Sweden, May 5-8, 2024.

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In this work, we introduce a framework that enables the use of Syndrome-Based Neural Decoders (SBND) for highorder Bit-Interleaved Coded Modulations (BICM). To this end, we extend the previous results on SBND, for which the validity is limited to Binary Phase-Shift Keying (BPSK), by means of a theoretical channel modeling of the bit Log-Likelihood Ratio (bit-LLR) induced outputs.We implement the proposed SBND system for two polar codes (64, 32) and (128, 64), using a Recurrent Neural Network (RNN) and a Transformer-based architecture. Both implementations are compared in Bit Error Rate (BER) performance and computational complexity.

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Communications numériques / Systèmes spatiaux de communication et Autre

On the Optimality of Support Vector Machines for Channel Decoding

Auteurs : De Boni Rovella Gastón, Benammar Meryem, Meric Hugo et Benaddi Tarik

In Proc. European Conference on Networks and Communications (EuCNC), Antwerp, Belgium, June 3-6, 2024.

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In this work, we investigate the construction of channel decoders based on machine learning solutions, and more specifically, Support Vector Machines (SVM). The channel decoding problem being a high-dimensional multiclass classification problem, previous attempts were made in the literature to construct SVM-based channel decoders. However, existing solutions suffer from a dimensionality curse, both in the number of SVMs involved –which are exponential in the block length–and in the training dataset size. In this work, we revisit SVMbased channel decoders by alleviating these limitations and prove that the suggested SVM construction can achieve optimal Bit Error Probability (BEP) by attaining the performance of the bit-Maximum A Posteriori (MAP) decoder in the Additive White Gaussian Noise (AWGN) channel.

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Communications numériques / Systèmes spatiaux de communication et Autre

Misspecified Time-Delay and Doppler Estimation over Non Gaussian Scenarios

Auteurs : Ortega Espluga Lorenzo et Fortunati Stefano

In Proc. ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pp. 9346-9350, Seoul, Korea, Republic of, 14-19 April 2024.

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Time-delay and Doppler estimation is an operation performed in a plethora of engineering applications. A common hypothesis underlying most of the existing works is that the noise of the true and assumed signal model follows a centered complex normal distribution. However, everyday practice shows that the true signal model may differ from the nominal case and should be modeled by a non Gaussian distribution. In this paper, we analyse the asymptotic performance of the time-delay and Doppler estimation for the non-nominal scenario where the true noise model follows a centered complex elliptically symmetric (CES) distribution and the receiver assumed that the noise model follows a centered complex normal distribution. It turns out that performance bound under the misspecified model is equal to the one obtained for the well specified Gaussian scenario. In order to validate the theoretical outcomes, Monte Carlo simulations have been carried out.

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Traitement du signal et des images / Localisation et navigation et Systèmes spatiaux de communication

Séminaire

On hybrid and Modified Lower bounds for Discrete-time Markovian Dynamic systems

Auteurs : El Bouch Sara, Labsir Samy, Vilà-Valls Jordi et Chaumette Eric

Seminar of TeSA, Toulouse, April, 2024.

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In this talk, I will introduce a method for sequentially estimating both random and deterministic parameters within linear Gaussian discrete-time state space models. Following that, the performance of the obtained joint Maximum-a-posteriori Maximum likelihood estimator is assessed using hybrid Cramér-Rao bounds on two illustrative examples. Moving forward, I will exhibit the link between the Modified Cramér-Rao bound, a ubiquitous bound in non-standard estimation problems, and the hybrid Cramér-Rao bound under a mild constraint. Leveraging this link enables us to derive a recursive estimation scheme of the Modified Cramér-Rao bound (under constraint) for Markovian Dynamic Systems. Finally, I will discuss the extension of the Modified Cramér-Rao bound to matrix Lie groups.

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Traitement du signal et des images / Localisation et navigation et Autre

Article de journal

On the asymptotic performance of time-delay and Doppler estimation with a carrier modulated by a band-limited signal

Auteurs : Bernabeu Frias Joan Miguel, Ortega Espluga Lorenzo, Blais Antoine, Gregoire Yoan et Chaumette Eric

EURASIP Journal on Advances in Signal Processing, vol. 2024 (1), pp. 47, April, 2024.

Time-delay and Doppler estimation is crucial in various engineering fields, as estimating these parameters constitutes one of the key initial steps in the receiver’s operational sequence. Due to its importance, several expressions of the Cramér–Rao Bound (CRB) and Maximum Likelihood Estimation (MLE) have been derived over the years. Previous contributions started from the assumption that the transmission process introduces an unknown phase, which hindered the explicit consideration of the time-delay parameter in the carrier-phase component in theoretical derivations. However, this contribution takes into account this additional term under the assumption that such an unknown phase is inferred and compensated for. This new condition leads to the derivation of a novel MLE. Subsequently, a closed-form expression of the achievable Mean Squared Error (MSE) for the time-delay and Doppler parameters is provided for the asymptotic region, assuming the signal is band-limited. Both expressions are validated via Monte Carlo simulations. This analysis reveals five distinct regions of operation of the MLE, refining existing knowledge and providing valuable insights into time-delay estimation

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Traitement du signal et des images / Localisation et navigation et Systèmes spatiaux de communication

Rethinking LEO Constellations Routing

Auteurs : Grislain Paul, Auddino Alexia, Barraqué Anna, Lamothe François, Hotescu Oana, Lacan Jérôme, Radzik José et Lochin Emmanuel

International Journal of Satellite Communications and Networking, March, 2024.

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This study investigates the Unsplittable Multi-Commodity Flow (UMCF) as a routing algorithm for LEO constellations. Usually, LEO routing schemes enable the Floyd-Warshall algorithm (Shortest Path) to minimize the end-to-end latency of the flows crossing the constellation. We propose to solve the UMCF problem associated with the system as a solution for routing over LEO. We use a heuristic algorithm based on randomized rounding known in the optimization literature to efficiently solve the UMCF problem. Furthermore, we explore the impact of choosing the first/last hop before entering/exiting the constellation. Using network simulation over Telesat constellation, we show that UMCF maximizes the end-to-end links usage, providing better routing while minimizing the delay and the congestion level, which is an issue today over new megaconstellations.

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Réseaux / Systèmes spatiaux de communication

Séminaire

Calcul Quantique : Graal de l’optimisation ou Mirage de la puissance ?

Auteur : Gondran Alexandre

Seminar of TeSA, Toulouse, February 9, 2024.

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Réseaux / Autre

Article de conférence

Discrimination between Noise and Distortion in EVM Measurements

Auteurs : Sombrin Jacques B., Ros Benjamin et Chaumet Aurélien

In Proc. 2024 102nd ARFTG Microwave Measurement Conference (ARFTG), pp. 1-4, San Antonio, TX, USA, 21-24 Jan. 2024.

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EVM (Error Vector Measurement) is used to measure the end-to-end quality of digital communication links. It comes from noise, linear and non-linear distortion, and interference if any. I propose a method to discriminate between random noise that is independent of the signal and distortion that depends on the signal. Interference is more complex to discriminate as it is not random but can be either synchronous with the signal or not. Echoes such as multipath cause linear distortion if they are static. However, variable echoes, such as those created in a reverberation chamber must be treated specifically.

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Traitement du signal et des images / Systèmes spatiaux de communication

Time-Delay and Doppler Estimation with a Carrier Modulated by a Band-Limited Signal

Auteurs : Bernabeu Frias Joan Miguel, Ortega Espluga Lorenzo, Blais Antoine, Gregoire Yoan et Chaumette Eric

In Proc. IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), Los Sueños, Costa Rica, December 10-13, 2023.

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Since time-delay and phase estimation is a fundamental task in a plethora of engineering fields, several CRB and MLE expressions have been derived for the past decades. In all these previous works, a common hypothesis is that the wave transmission process introduces an unknown phase which prevents from estimating both delay and transmission phase components. By revisiting this problem, including the derivation of the MLE and the associated CRB, we show that this well-admitted assertion is not true strictly: both informations can be estimated, but generally with a sub-optimal achievable MSE in the asymptotic region. Moreover, since practical problems exist where the transmission phase can be estimated apart, adding this additionnal measure to the observation model provides a setting allowing to explore the contribution of each signal component (carrier frequency, baseband signal and transmission phase measure) to the achievable MSE of time-delay and phase estimation in the asymptotic region.

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Traitement du signal et des images / Systèmes de communication aéronautiques et Systèmes spatiaux de communication

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