On Recovery of Sparse Signals Via l1 Minimization

This paper considers constrained l(1) minimization methods in a unified framework for the recovery of high-dimensional sparse signals in three settings: noiseless, bounded error, and Gaussian noise. Both l(1) minimization with an l(infinity) constraint (Dantzig selector) and l(1) minimization under an l(2) constraint are considered. The results of this paper improve the existing results in the literature by weakening the conditions and tightening the error bounds. The improvement on the conditions shows that signals with larger support can be recovered accurately. In particular, our results illustrate the relationship between l(1) minimization with an l(2) constraint and l(1) minimization with an l(infinity) constraint. This paper also establishes connections between restricted isometry property and the mutual incoherence property. Some results of Candes, Romberg, and Tho (2006), Candes and Tho (2007), and Donoho, Elad, and Temlyakov (2006) are extended.