TITLE:
Amplitude and Phase Analysis Based on Signed Demodulation for AM-FM Signal
AUTHORS:
Guanlei Xu, Xiaotong Wang, Xiaogang Xu, Limin Shao
KEYWORDS:
Amplitude Demodulation, Phase, Hilbert Transform, Signed Demodulation
JOURNAL NAME:
Journal of Computer and Communications,
Vol.2 No.9,
July
11,
2014
ABSTRACT:
This paper proposes a new amplitude and
phase demodulation scheme different from the traditional method for AM-FM
signals. The traditional amplitude demodulation assumes that the amplitude
should be non-negative, and the phase is obtained under the case of
non-negative amplitude, which approximates the true amplitude and phase but distorts
the true amplitude and phase in some cases. In this paper we assume that the
amplitude is signed (zero, positive or negative), and the phase is obtained
under the case of signed amplitude by optimization, as is called signed demodulation.
The main merit of the signed demodulation lies in the revelation of senseful
physi- cal meaning on phase and frequency. Experiments on the real-world data
show the efficiency of the method.