Effect of channel distortions in the performance of digital transmission systems with QAM modulation

Author

Moreira, W.S. ; Brandão, João Celio

fYear

1990

fDate

3-6 Sep 1990

Firstpage

297

Lastpage

301

Abstract

Analytical expressions for mean square and peak values of the intersymbol interference in QAM (quadrature amplitude modulation) digital transmission systems with some particular channel transfer functions are derived. Linear, quadratic, cubic, and sinusoidal channel amplitude responses are considered. Performance degradation curves corresponding to these distortions are obtained using a computer program for analysis and simulation of digital transmission systems. Results of performance degradation for 16-QAM and 64-QAM modulation systems are presented. For small distortion levels it is also shown that the obtained analytical results can provide a simple approximation for the performance degradation

Keywords

amplitude modulation; digital communication systems; intersymbol interference; telecommunication channels; 16-QAM; 64-QAM; channel distortions; channel transfer functions; cubic response; digital transmission systems; intersymbol interference; linear response; mean square interference; peak interference; performance degradation; quadratic response; quadrature amplitude modulation; sinusoidal channel amplitude responses; Amplitude modulation; Computational modeling; Degradation; Digital modulation; Filters; Intersymbol interference; Performance analysis; Quadrature amplitude modulation; Transfer functions; White noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Symposium, 1990. ITS '90 Symposium Record., SBT/IEEE International

Conference_Location

Rio de Janeiro

Type

conf

DOI

10.1109/ITS.1990.175616

Filename

175616