Performance comparison of LMS, diagonalizer and bootstrapped adaptive cross-pol cancellers for M-ary QAM

Document Type

Conference Proceeding

Publication Date

12-1-1990

Abstract

In microwave radio communication networks, the transmission capacity can be doubled by using orthogonally polarized quadrature amplitude modulated (QAM) carriers. The orthogonally polarized waves can suffer degradation due to carrier-to-cross-polarization interference (C/XPI). Particularly during multipath fading, such degradation would become intolerable. Different canceler structures are proposed to mitigate the effect of cross-polarization. Among these are the diagonalizer, the LMS, and the bootstrapped cancelers. The bootstrapped canceler has been implemented in different applications such as satellite dual-polarized communication, tactical communication, and QAM microwave radio. The probability of error performance of the bootstrapped cross-polarization canceler (BXPC) is studied and compared to the performance of other cancelers. The mathematical model of the dual-polarized channel is presented, and the structure of the BXPC is described. The performance analysis of the BXPC for dual-polarized M-ary QAM system over nondispersive fading channel is presented. The performance of the three cancelers is compared numerically for the 16 QAM with r = -10 dB, and -5 dB. Since the diagonalizer is shown to be useless for the 64 QAM, the LMS and BXPC with 64 QAM are compared. It is shown that the LMS canceler outperforms the diagonalizers, particularly when the cross-coupling is high. The difference in performance between the BXPC and LMS is compared when using 16 QAM and 64 QAM. This is done for r = -15 dB, -10 dB and -5 dB. Except for a very low signal-to-noise ratio, the BXPC outpeforms the LMS with 64 QAM, more than with 16 QAM.

Identifier

0025559207 (Scopus)

Publication Title

Proceedings IEEE Military Communications Conference

First Page

101

Last Page

105

This document is currently not available here.

Share

COinS