An Efficient Model Based on Smoothed l0 Norm for Sparse Signal Reconstruction

Compressed sensing (CS) is a new theory. With regard to the sparse signal, an exact reconstruction can be obtained with sufficient CS measurements. Nevertheless, in practical applications, the transform coefficients of many signals usually have weak sparsity and suffer from a variety of noise disturbances. What's worse, most existing classical algorithms are not able to effectively solve this issue. So we proposed an efficient algorithm based on smoothed l(0) norm for sparse signal reconstruction. The direct l(0) norm problem is NP hard, but it is unrealistic to directly solve the l(0) norm problem for the reconstruction of the sparse signal. To select a suitable sequence of smoothed function and solve the l(0) norm optimization problem effectively, we come up with a generalized approximate function model as the objective function to calculate the original signal. The proposed model preserves sharper edges, which is better than any other existing norm based algorithm. As a result, following this model, extensive simulations show that the proposed algorithm is superior to the similar algorithms used for solving the same problem.