no code implementations • 17 Aug 2022 • Malek Khammassi, Abla Kammoun, Mohamed-Slim Alouini
This survey presents an overview and a classification of the recent precoding techniques for HTS communication systems from two main perspectives: 1) a problem formulation perspective and 2) a system design perspective.
no code implementations • 24 May 2022 • Xiuxiu Ma, Abla Kammoun, Ayed M. Alrashdi, Tarig Ballal, Tareq Y. Al-Naffouri, Mohamed-Slim Alouini
We show that for this class of precoders, there is an optimal transmit per-antenna power that maximizes the system performance in terms of SINAD and bit error probability.
no code implementations • 1 Oct 2021 • Lama B. Niyazi, Abla Kammoun, Hayssam Dahrouj, Mohamed-Slim Alouini, Tareq Al-Naffouri
Applying this method to a number of linear classifiers under a variety of data dimensionality and sample size settings reveals that the classification performance loss due to non-optimal native hyperparameters can be compensated for by weight vector tuning.
no code implementations • 21 May 2021 • Houssem Sifaou, Abla Kammoun, Mohamed-Slim Alouini
In this paper, we study the hard and soft support vector regression techniques applied to a set of $n$ linear measurements of the form $y_i=\boldsymbol{\beta}_\star^{T}{\bf x}_i +n_i$ where $\boldsymbol{\beta}_\star$ is an unknown vector, $\left\{{\bf x}_i\right\}_{i=1}^n$ are the feature vectors and $\left\{{n}_i\right\}_{i=1}^n$ model the noise.
no code implementations • 25 Jun 2020 • Houssem Sifaou, Abla Kammoun, Mohamed-Slim Alouini
Quadratic discriminant analysis (QDA) is a widely used classification technique that generalizes the linear discriminant analysis (LDA) classifier to the case of distinct covariance matrices among classes.
no code implementations • 11 Jun 2020 • Amine Bejaoui, Khalil Elkhalil, Abla Kammoun, Mohamed Slim Alouni, Tarek Al-Naffouri
The use of quadratic discriminant analysis (QDA) or its regularized version (R-QDA) for classification is often not recommended, due to its well-acknowledged high sensitivity to the estimation noise of the covariance matrix.
no code implementations • 17 Apr 2020 • Lama B. Niyazi, Abla Kammoun, Hayssam Dahrouj, Mohamed-Slim Alouini, Tareq Y. Al-Naffouri
Datasets from the fields of bioinformatics, chemometrics, and face recognition are typically characterized by small samples of high-dimensional data.
no code implementations • 13 Nov 2019 • Zeyu Deng, Abla Kammoun, Christos Thrampoulidis
We consider a model for logistic regression where only a subset of features of size $p$ is used for training a linear classifier over $n$ training samples.
no code implementations • 19 Apr 2019 • Khalil Elkhalil, Abla Kammoun, Xiangliang Zhang, Mohamed-Slim Alouini, Tareq Al-Naffouri
This paper carries out a large dimensional analysis of a variation of kernel ridge regression that we call \emph{centered kernel ridge regression} (CKRR), also known in the literature as kernel ridge regression with offset.
1 code implementation • 1 Nov 2017 • Khalil Elkhalil, Abla Kammoun, Romain Couillet, Tareq Y. Al-Naffouri, Mohamed-Slim Alouini
This article carries out a large dimensional analysis of standard regularized discriminant analysis classifiers designed on the assumption that data arise from a Gaussian mixture model with different means and covariances.