The effect of spatial axial ratio variation on QPSK modulation encoded using orthogonal circularly polarized signals

M. Amin*, S. Ahmed, V. Fusco, H. Cantu, T. Ratnarajah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

In this work, we show a new method which can directly encode an I (In-phase) and Q (Quadrature-phase) baseband data stream onto a circularly polarized (CP) microwave signal. Here I and Q components are fed directly into a two port CP antenna in order to yield right hand circular polarized (RHCP) or left hand circular polarized (LHCP) waveforms each encoded with zero or 180° phase shift in order to effect QPSK modulation. The CP signal from such an antenna will have deterministic unequal amplitude and phase shifts at different far field spatial locations which if not compensated will degrade the bit-error-rate (BER) performance of the receiver. Simulation and experimental results show the BER performance of the receiver when these two orthogonal CP components have spatially induced phase differences or amplitude imbalances between them. The technique described allows a factor two reduction over the normal QPSK requirement by virtue of the polarization diversity inherent in the scheme.

Original languageEnglish (US)
Title of host publicationEuropean Microwave Week 2007 Conference Proceedings, EUMIC 2007 - 10th European Conference on Wireless Technology, ECWT 2007
Pages62-65
Number of pages4
DOIs
StatePublished - 2007
Externally publishedYes
EventEuropean Microwave Week 2007, EuMW 2007 - 10th European Conference on Wireless Technology, ECWT 2007 - Munich, Germany
Duration: Oct 8 2007Oct 10 2007

Other

OtherEuropean Microwave Week 2007, EuMW 2007 - 10th European Conference on Wireless Technology, ECWT 2007
CountryGermany
CityMunich
Period10/8/0710/10/07

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Communication

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