Superresolution in the presence of nonuniform noise power

The effects of nonuniform noise power in the antenna elements on the performance of the standard MUSIC, reduced MUSIC, and the recursive suppression algorithms are examined. It is shown that the speeds of resolution of all the algorithms are slowed, but their steady-state errors do not exhibit much sensitivity to the noise-power variations. The reduced MUSIC algorithm is shown to provide nearly the same performance as the standard MUSIC algorithm while eliminating the need to estimate the number of signal sources. A simple adaptive superresolution system using the recursive algorithm can be decomposed into two parts, as illustrated.