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- João F. C. Mota, Nikos Deligiannis, Miguel R. D. Rodrigues
- 2014 IEEE Global Conference on Signal and…
- 2014

We address the problem of Compressed Sensing (CS) with side information. Namely, when reconstructing a target CS signal, we assume access to a similar signal. This additional knowledge, the side information, is integrated into CS via ℓ<sub>1</sub>-ℓ<sub>1</sub> and ℓ<sub>1</sub>-ℓ<sub>2</sub> minimization. We then provide lower… (More)

—We address the problem of compressed sensing (CS) with prior information: reconstruct a target CS signal with the aid of a similar signal that is known beforehand, our prior information. We integrate the additional knowledge of the similar signal into CS via ℓ1-ℓ1 and ℓ1-ℓ2 minimization. We then establish bounds on the number of measurements required by… (More)

We propose a recursive algorithm for estimating time-varying signals from a few linear measurements. The signals are assumed sparse, with unknown support, and are described by a dynamical model. In each iteration, the algorithm solves an ℓ1-ℓ1 minimization problem and estimates the number of measurements that it has to take at the next iteration. These… (More)

- João F. C. Mota, João M. F. Xavier, Pedro M. Q. Aguiar, Markus Püschel
- IEEE Transactions on Signal Processing
- 2012

We propose a distributed algorithm for solving the optimization problem Basis Pursuit (BP). BP finds the least ℓ<sub>1</sub>-norm solution of the underdetermined linear system Ax = b and is used, for example, in compressed sensing for reconstruction. Our algorithm solves BP on a distributed platform such as a sensor network, and is designed to… (More)

- João F. C. Mota, João M. F. Xavier, Pedro M. Q. Aguiar, Markus Püschel
- IEEE Transactions on Signal Processing
- 2013

We propose a distributed algorithm, named Distributed Alternating Direction Method of Multipliers (D-ADMM), for solving separable optimization problems in networks of interconnected nodes or agents. In a separable optimization problem there is a private cost function and a private constraint set at each node. The goal is to minimize the sum of all the cost… (More)

— Many problems in control can be modeled as an optimization problem over a network of nodes. Solving them with distributed algorithms provides advantages over centralized solutions, such as privacy and the ability to process data locally. In this paper, we solve optimization problems in networks where each node requires only partial knowledge of the… (More)

- João F. C. Mota, João M. F. Xavier, Pedro M. Q. Aguiar, Markus Püschel
- 2011 IEEE International Conference on Acoustics…
- 2011

Basis Pursuit (BP) finds a minimum ℓ<inf>1</inf>-norm vector z that satisfies the underdetermined linear system Mz = b, where the matrix M and vector b are given. Lately, BP has attracted attention because of its application in compressed sensing, where it is used to reconstruct signals by finding the sparsest solutions of linear systems. In this… (More)

- João F. C. Mota, João M. F. Xavier, Pedro M. Q. Aguiar, Markus Püschel
- IEEE Trans. Automat. Contr.
- 2015

—In this paper we consider a network with P nodes, where each node has exclusive access to a local cost function. Our contribution is a communication-efficient distributed algorithm that finds a vector x ⋆ minimizing the sum of all the functions. We make the additional assumption that the functions have intersecting local domains, i.e., each function… (More)

—We propose and analyze an online algorithm for reconstructing a sequence of signals from a limited number of linear measurements. The signals are assumed sparse, with unknown support, and evolve over time according to a generic nonlinear dynamical model. Our algorithm, based on recent theoretical results for ℓ1-ℓ1 minimization, is recursive and computes… (More)

Desynchronization algorithms are essential in the design of collision-free medium access control (MAC) mechanisms for wireless sensor networks. Desync is a well-known desynchronization algorithm that operates under limited listening. In this paper, we view Desync as a gradient descent method solving a convex optimization problem. This enables the design of… (More)