Combining Capon and APES for estimation of spectral lines

We propose combining the Capon and the APES spectral estimators for estimat ion of both the amplitude and the frequency of spectral lines. The so-obtai ned estimator does not suffer from Capon's biased amplitude estimates nor f rom APES' biased frequency estimates or resolution problem. Furthermore, th e combined estimator is computationally simpler than APES and has about the same complexity as Capon. Numerical simulations are presented illustrating the increased performance.