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Code orthogonality for wideband CDMA systems with multiple transmit antennas

Research output: Contribution to journalArticle

Original languageEnglish
Pages3749 - 3756
Number of pages8
JournalIEEE Transactions on Vehicular Technology
Journal publication dateNov 2007
Volume56
Journal issue6, part 2
DOIs
StatePublished

Abstract

Code orthogonality is a useful indicator in determining the performance of the synchronous downlink of third generation Universal Mobile Telecommunication System (UMTS) Terrestrial Radio Access systems. In this paper, previous work on quantifying code orthogonality for single-antenna [or single-input single-output (SISO)] links is extended to fixed beamforming and transmit diversity schemes. Code orthogonality estimates from real measured channel data are extracted for typical outdoor radio environments. The results indicate that the spatial conditioning of fixed beamforming radio channels generally improves code orthogonality. In contrast, full code-rate transmit diversity schemes degrade code orthogonality.

Additional information

Publisher: Institute of Electrical and Electronics Engineers, Inc. (IEEE) Rose publication type: Journal article Sponsorship: This work was supported in part by the Higher Education Funding Council for England Joint Research Equipment Initiative 1998 and in part by OFCOM’s U.K. Spectrum Efficiency Scheme. The work of M. Hunukumbure was supported by the ORS scheme and the University of Bristol scholarship during his postgraduate studentship. Terms of use: Copyright © 2007 IEEE. Reprinted from IEEE Transactions on Vehicular Technology. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • code orthogonality, fixed beamforming, transmit diversity, space- time block codes (STBC), wideband code division multiple access (WCDMA)

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