Title :
Turbo decoder for high-speed application in wideband-code division multiple access system
Author :
Ohbuchi, Kazuhisa ; Yano, Tetsuya ; Miyazaki, Shunji ; Nakamura, Takaharu
Author_Institution :
Fujitsu Labs. Ltd., Yokosuka, Japan
Abstract :
Implementation of a turbo decoder for high-speed application in W-CDMA (wideband-code division multiple access) systems and its performance are described As an implementation of the max-log-MAP (maximum a posteriori) algorithm for the turbo decoder, we propose what we call a "stepping-stone-max-log-MAP" (SS-max-log-MAP) algorithm that reduces memory size in the turbo decoder without loss of performance compared to the ordinal max-log-MAP algorithm, even when bit puncturing is used to adjust transmission data rate. Performance evaluation of the SS-max-log-MAP turbo decoder is also described when applied to a high-speed data channel in W-CDMA.
Keywords :
3G mobile communication; code division multiple access; data communication; maximum likelihood decoding; turbo codes; IMT-2000; W-CDMA; bit puncturing; high-speed data channel; memory size reduction; stepping-stone-max-log-MAP algorithm; turbo coding; turbo decoder; wideband-code division multiple access; Hardware; Iterative decoding; Laboratories; Multiaccess communication; Performance loss; Probability; Propagation losses; Read-write memory; Research and development; Wideband;
Conference_Titel :
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
Print_ISBN :
0-7803-7974-8
DOI :
10.1109/GLOCOM.2003.1258656
