The Operation of Dual Polarized QAM Systems in the Presence of Depolarization Crosstalk and Differential Fading

Author

Duvoisin, Paul F. ; Hsieh, S.T. ; Williamson, Edward P.

Author_Institution

Tulane University, New Orleans, LA

Volume

5

Issue

3

fYear

1987

fDate

4/1/1987 12:00:00 AM

Firstpage

437

Lastpage

447

Abstract

The performance of dual-polarized $M$ -QAM systems is studied. By assuming coherence between the crosstalk and the desired signal, results are obtained for systems up to the modulation level of 64 QAM in each channel. Both balanced systems, with equal modulation levels in each channel, and unbalanced systems, with different modulation levels in each channel, are considered. Graphs are presented which show possible design tradeoffs to improve performance and suggest methods of system optimization. Each system is found to have an optimum value of relative transmitter power in the two channels. Analyses include the application of empirically based channel models giving relations between depolarization crosstalk, coplanar path attenuation, and differential fading levels.

Keywords

Crosstalk; Multipath channels; Quadrature amplitude modulation; Attenuation; Crosstalk; Fading; Frequency; Intersymbol interference; Polarization; Power system modeling; Quadrature amplitude modulation; Signal analysis; Transmitters;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/JSAC.1987.1146552

Filename

1146552