Sparse recovery via Orthogonal Least-Squares under presence of Noise
This work provides improved theoretical guarantees for sparse signal recovery in noisy scenarios, which is incremental but relevant for applications in signal processing and compressed sensing.
The paper tackles the problem of recovering sparse signals from noisy linear measurements using the Orthogonal Least-Squares (OLS) algorithm, establishing an Exact Recovery Condition and showing that O(k log m) measurements suffice for exact recovery with high probability.
We consider the Orthogonal Least-Squares (OLS) algorithm for the recovery of a $m$-dimensional $k$-sparse signal from a low number of noisy linear measurements. The Exact Recovery Condition (ERC) in bounded noisy scenario is established for OLS under certain condition on nonzero elements of the signal. The new result also improves the existing guarantees for Orthogonal Matching Pursuit (OMP) algorithm. In addition, This framework is employed to provide probabilistic guarantees for the case that the coefficient matrix is drawn at random according to Gaussian or Bernoulli distribution where we exploit some concentration properties. It is shown that under certain conditions, OLS recovers the true support in $k$ iterations with high probability. This in turn demonstrates that ${\cal O}\left(k\log m\right)$ measurements is sufficient for exact recovery of sparse signals via OLS.