Title :
Performance of 16-state SQAM in a nonlinearly amplified multichannel interference environment
Author :
Seo, Jong-Soo ; Feher, Kamilo
Author_Institution :
Dept. of Electr. Eng., Ottawa Univ., Ont., Canada
fDate :
11/1/1988 12:00:00 AM
Abstract :
The performance of 16-state SQAM (superposed-QAM) system, in a nonlinearly amplified multichannel environment, in the presence of additive white Gaussian noise (AWGN), intersymbol interference (ISI), and adjacent channel interference (ACI), is experimentally analyzed via computer simulation. Various channel conditions, such as channel spacings between the main and adjacent channels, and fade depth on the desired main channel, are examined. Baseband signal waveshape of 16-SQAM as well as the receive low-pass filter bandwidth are optimized to achieve a good P(e) performance. The result shows that 16-SQAM system is more efficient than MAMSK (multiamplitude MSK) in the frequency utilization
Keywords :
amplitude modulation; filtering and prediction theory; intersymbol interference; telecommunication channels; white noise; 16-state SQAM; additive white Gaussian noise; adjacent channel interference; channel conditions; computer simulation; fade depth; intersymbol interference; nonlinearly amplified multichannel environment; receive low-pass filter bandwidth; AWGN; Additive white noise; Bandwidth; Baseband; Channel spacing; Computer simulation; Interchannel interference; Intersymbol interference; Low pass filters; Performance analysis;
Journal_Title :
Communications, IEEE Transactions on
