Title :
A universal test bed for innovative SAW filter quadrature binary modulation systems
Author :
Vigil, A.J. ; Belkerdid, M.A. ; Malocha, D.C.
Author_Institution :
Electronic Decisions Inc., Urbana, IL, USA
Abstract :
SAW (surface acoustic wave) filters have been applied to FIR modulation systems such as QPSK (quadrature phase shift keying) and MSK (minimum shift keying) because they offer precise time-domain symbol shaping, which provides many different types of systems to be implemented with varying spectral confinement, time-domain envelope uniformity, and intersymbol interference. By using the combination of a digital message sequence, an impulse driver, and different SAW modulator filters, an RF testbed has been designed for experimental testing of arbitrary quadrature binary modulation schemes. The SAW filter quadrature binary modulation system and advantages are discussed. Excellent agreement between time- and frequency-domain measurements and theory using the SAW modulation system is shown. In addition, the hardware testbed design is described, and system optimization is discussed
Keywords :
phase shift keying; surface acoustic wave filters; FIR modulation systems; MSK; QPSK; RF testbed; SAW modulator filters; digital message sequence; impulse driver; innovative SAW filter quadrature binary modulation systems; intersymbol interference; minimum shift keying; precise time-domain symbol shaping; quadrature phase shift keying; surface acoustic wave; time-domain envelope uniformity; universal test bed; Acoustic testing; Acoustic waves; Digital modulation; Finite impulse response filter; Impulse testing; Phase modulation; Quadrature phase shift keying; SAW filters; Surface acoustic waves; Time domain analysis;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234128
