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

Volume

36

Issue

11

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

1263

Lastpage

1267

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;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.8936

Filename

8936