Code orthogonality for wideband CDMA systems with multiple transmit antennas
Affiliation
Fujitsu Laboratories of Europe Limited, UxbridgeIssue Date
2007-11Subjects
code orthogonalityspace-time block codes
wideband CDMA
fixed beamforming
transmit diversity
wideband code-division multiple access (WCDMA)
WCDMA
Metadata
Show full item recordAbstract
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.Citation
Hunukumbure, M., Allen, B., Beach, M. (2007) 'Code Orthogonality for Wideband CDMA Systems With Multiple Transmit Antennas' IEEE Transactions on Vehicular Technology 56 (6):3749-3756Type
ArticleLanguage
enISSN
0018-9545ae974a485f413a2113503eed53cd6c53
10.1109/TVT.2007.904525