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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.
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE (Volume:4 )
Date of Conference: 1-5 Dec. 2003