A Technique to Compute Smooth Amplitude, Phase, and Frequency Modulations From the Analytic Signal
2012 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 19, no 10, 623-626 p.Article in journal (Refereed) Published
Gabor’s analytic signal (AS) is a unique complexsignal corresponding to a real signal, but in general, it admitsinfinitely-many combinations of amplitude and frequency modu-lations (AM and FM, respectively). The standard approach is toenforce a non-negativity constraint on the AM, but this results indiscontinuities in the corresponding phase modulation (PM), andhence, an FM with discontinuities particularly when the under-lying AM-FM signal is over-modulated. In this letter, we analyzethe phase discontinuities and propose a technique to computesmooth AM and FM from the AS, by relaxing the non-negativityconstraint on the AM. The proposed technique iseffective athandling over-modulated signals. We present simulation results tosupport the theoretical calculations.
Place, publisher, year, edition, pages
IEEE Signal Processing Society, 2012. Vol. 19, no 10, 623-626 p.
Analytic signal, amplitude modulation, phase modulation, over-modulation
IdentifiersURN: urn:nbn:se:kth:diva-131267DOI: 10.1109/LSP.2012.2209872ISI: 000307187800001ScopusID: 2-s2.0-84864680000OAI: oai:DiVA.org:kth-131267DiVA: diva2:655187
QC 201312112013-10-102013-10-102013-12-11Bibliographically approved