Title :
A Simple Modulator for Sinusoidal Frequency Shift Keying
Author :
LaRosa, Richard ; Marynowski, Thomas J. ; Henrich, Kenneth J.
Author_Institution :
Hazeltine Corporation, Greenlawn, N.Y. 11740
Abstract :
This paper describes a method of generating a constant-envelop sinusoidal-frequency-shift-keyed spread-spectrum signal from a sequence of phase coded rectangular pulses. In-phase and quadrature pulse streams are combined and passed through a SAW filter. The constant time delay property of the SAW filter is used to transform the rectangular pulses into the proper shape. Time and frequency domain outputs are shown for a modulator operating at 70 MHz and a chip rate of 5 Mchip/s.
Keywords :
Delay effects; Frequency domain analysis; Frequency modulation; Frequency shift keying; Pulse generation; Pulse shaping methods; SAW filters; Shape; Signal generators; Spread spectrum communication;
Conference_Titel :
Military Communications Conference - Progress in Spread Spectrum Communications, 1982. MILCOM 1982. IEEE
DOI :
10.1109/MILCOM.1982.4805909
