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Orientation analysis for antenna diversity using circular polarization

Huang, Brian & Senadji, Bouchra (2008) Orientation analysis for antenna diversity using circular polarization. In International Conference on Signal Processing and Communication Systems 2008, 15-17 December 2008, Gold Coast, Australia.

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Abstract

Traditional polarization diversity systems have relied on the distribution of obstacles within the mobile medium to achieve signal decorrelation and power coupling between orthogonal polarizations. If the channel does not facilitate adequate power coupling, signal diversity is suboptimal because signal contribution from the polarization with lesser power is limited. Further, due to the presence of a dominant polarization, the signal power received in the orthogonal polarizations becomes a function of the transmitter orientation. The use of circular polarization at the transmitter is proposed to facilitate power coupling and alleviate the branch power imbalance between the vertical and horizontal polarizations. The analysis shows that if circular polarization is used, the branch power imbalance between the vertical and horizontal polarizations can be significantly lower than linear polarization, and that the cross polarization discrimination becomes independent of the transmitter orientation. The proposed antenna configuration to achieve circular polarization allows for polarization diversity to be implemented in the uplink and downlink.

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ID Code: 17048
Item Type: Conference Paper
Keywords: Transmit Polarization Diversity, Branch Power Imbalance, Cross Polarization Discrimination
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Signal Processing (090609)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Electrical and Electronic Engineering not elsewhere classified (090699)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2008 [please consult the authors]
Deposited On: 22 Dec 2008 09:03
Last Modified: 29 Feb 2012 23:42

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