Title :
Spectrum shaping SAW filters for high-bit-rate digital radio
Author :
Ganss-Puchstein, R. ; Ruppel, C. ; Stocker, H.R.
Author_Institution :
Siemens AG, Munich, West Germany
Abstract :
The structure of a QAM radio system is explained. Some novel designs that demonstrate the current status of spectral shaping SAW (surface acoustic wave) filters are presented. Compensation of second-order effects is discussed. Experimental results for a filter for a 140-Mb/s 16 QAM cochannel system with a roll-off factor of 0.19 are shown. Two other examples of filters for a 140-Mb/s, 64 QAM system with a 35% relative bandwidth are also presented.<>
Keywords :
amplitude modulation; radio systems; surface acoustic wave filters; 140 Mbit/s; QAM radio system; SAW filters; high-bit-rate digital radio; roll-off factor; spectral shaping; surface acoustic wave; Amplitude modulation; Capacitors; Coils; Digital communication; Digital filters; Quadrature amplitude modulation; SAW filters; Stability; Surface acoustic waves; Tuning;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
