NDLI: Sliding discrete Fourier transform-based mono-component amplitude modulation–frequency modulation signal decomposition

Content Provider	IET Digital Library
Author	Sumathi, Parasuraman Singh, Ksh Milan
Abstract	The sliding discrete Fourier transform-based phase locking scheme (SDFT-PLL) has been adapted for the extraction of message signals from mono-component amplitude modulation–frequency modulation (AM–FM) signals. In the proposed scheme, the SDFT-PLL is designed to track a carrier signal, which has been modulated by sinusoidal message signals both in amplitude and frequency. The sliding DFT filter is prone to windowing effect if input signal frequency drifts from centre carrier frequency. The amplitude and phase errors caused by this effect have been utilised to achieve locking condition by adaptive sampling frequency control. The SDFT-PLL is modified in such a way that the numerically controlled oscillator produces sampling pulses suitable for SDFTbin-1 and SDFT bin-0 for the retrieval of frequency and amplitude modulation signals, respectively. Hence, the frequency and amplitude variation of monocomponent AM–FM could be retrieved simultaneously. Furthermore, Bessel function-based analysis provides an insight to the removal of unwanted spectral components present in error signal. Simulation results prove the capability of PLL in message signal retrieval for large variation in frequency and amplitude. The proposed scheme is implemented in field programmable gate array to validate the performance of SDFT-PLL in decomposition of the mono-component AM–FM signal.
Starting Page	1221
Ending Page	1229
Page Count	9
ISSN	17518628
Volume Number	9
e-ISSN	17518636
Issue Number	Issue 9, Jun (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/9/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.0643
Journal	IET Communications
Publisher Date	2015-04-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Sampling Frequency Control Amplitude Error Amplitude Modulation Amplitude Modulation Signal Retrieval Bessel Function Bessel Function-based Analysis Carrier Signal Tracking Centre Carrier Frequency Discrete Fourier Transform Error Signal Field Programmable Gate Array Frequency Modulation Frequency Modulation Signal Retreival Input Signal Frequency Integral Transforms Locking Condition Message Signal Extraction Message Signal Retrieval Modulation And Coding Method Monocomponent AM-FM Signal Decomposition Monocomponent Amplitude Modulation-frequency Modulation Signal Numerically-controlled Oscillator Phase Error PLL Capability Sampling Pulses SDFT Bin-0 SDFT Bin-1 SDFT-PLL Scheme Signal Processing And Detection Signal Sampling Sinusoidal Message Signal Sliding DFT Filter Sliding Discrete Fourier Transform-based Phase Locking Scheme Unwanted Spectral Component Removal Windowing Effect
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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