Title :
Design of SAW FIR filters for quadrature binary modulation systems
Author :
Vigil, A.J. ; Malocha, Donald C. ; Belkerdid, Madjid A.
Author_Institution :
Comlinear Corp., Urbana, IL, USA
Abstract :
Approaches for designing surface acoustic wave (SAW) filters used in pulsed quadrature binary modulation (QBM) systems are presented. Several previously defined pulse shapes were implemented by a SAW filter and showed good QBM system performance with respect to modulation envelope nonuniformity (AM) and intersymbol interference (ISI). A new approach to QBM pulse shape definition using both frequency- and time-domain design criteria is described. This approach allows families of new pulse shapes having various levels of AM and spectral confinement to be designed. The approaches to the design equations are presented, and examples of specific pulse shapes and their implementation using SAW filters are given. Time- and frequency-domain results of iteratively designed pulse shapes for application to QBM systems are also presented, showing good performance.<>
Keywords :
frequency shift keying; intersymbol interference; minimum shift keying; modulators; phase shift keying; radiofrequency filters; surface acoustic wave filters; ISI; MSK; QBM pulse shape definition; QPSK; SAW FIR filters; SFSK; frequency-domain design criteria; intersymbol interference; modulation envelope nonuniformity; pulsed QBM; quadrature binary modulation; surface acoustic wave; time-domain design criteria; Acoustic pulses; Acoustic waves; Finite impulse response filter; Intersymbol interference; Pulse modulation; Pulse shaping methods; SAW filters; Shape; Surface acoustic waves; System performance;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
