Title :
Method for superimposing data on amplitude-modulated signals
Author :
Lockhart, G.B. ; Al-Jalili, Y.O.
Author_Institution :
University of Leeds, Department of Electrical & Electronic Engineering, Leeds, UK
Abstract :
The principles of a new modulation scheme are described which permit an additional data channel to be superimposed on conventional DSBAM signals without increasing band-width or envelope distortion. This scheme, named zero synchronous frequency modulation (ZSFM), requires additional signal processing and provision for combined AM/FM at the transmitter. At the receiver, the data signal is detected by a simple frequency demodulator, while envelope detection of the AM signal is performed in the usual way.
Keywords :
amplitude modulation; frequency modulation; signal detection; signal processing; AM/FM; DSBAM signals; ZSFM; amplitude-modulated signals; data superimposition method; double sideband amplitude modulation; envelope detection; frequency demodulator; signal processing; zero synchronous frequency modulation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19820260
