Title :
256-QAM Modem Performance in Distorted Channels
Author :
Wu, Kuang-Tsan ; Feher, Kamilo
Author_Institution :
Univ. of Ottawa, Canada
fDate :
5/1/1985 12:00:00 AM
Abstract :
Performance degradations of 256-QAM modems in distorted channels are studied in this correspondence. Illustrative linear, parabolic, and sinusoidal amplitude and group delay channel distortions, caused by filter imperfections and/or by selective radio fades, are investigated. To enable an easy comparison with 64-QAM systems, we present the degradations of these systems in the same figures as those of 256-QAM modems. It is shown that linear (slope) group delay and sinusoidal (ripple) amplitude distortions cause the most significant performance degradations.
Keywords :
Quadrature amplitude modulation; Radio communication; Bandwidth; Bit rate; Computer simulation; Degradation; Delay lines; Digital communication; Fading; Filters; Hardware; Modems;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOM.1985.1096325
