On the Combining of the Capon- and the APES- Spectral Estimators for Estimation of Spectral Lines
Andreas Jakobsson, Petre Stoica, J. Li · 1999
We propose a combining of the Capon- and the APES spectral estimators for estimation of both the amplitude and the frequency of spectral lines. The so-obtained estimator does not suffer from Capon's biased amplitude estimates neither from APES biased frequency estimates or resolution problem. Furthermore, the combined estimator is computationally simpler than APES, and has about the same complexity as Capon. Numerical simulations are presented illustrating the increased performance. 1. INTRODUCTION There has of lately been an increased interest in spectral estimation using the recently proposed APES (Amplitude and Phase EStimation) spectral estimator. The APES method was originally derived by means of a relatively involved approximate maximum likelihood approach [1]. In [2] it was found that APES, as well as the well-known Capon method [3, 4], could be interpreted as members of the class of matched-filterbank (MAFI) spectral estimators. With the MAFI interpretation, APES was given a s...