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Implementation of an efficient two-step SOVA turbo decoder for wireless communication systems

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3 Author(s)
Han, J.H. ; Sch. of Eng. & Electron., Edinburgh Univ. ; Erdogan, A.T. ; Arslan, T.

The authors present a soft-input soft-output (SISO) turbo decoder based on the two-step soft-output Viterbi algorithm (SOVA). The turbo decoder has been implemented with the trace-back algorithm (TBA). It achieves power and area reduction by employing an additional transition metric unit (TMU) for the generation of reliability values, instead of using a FIFO block for retrieving the previously stored reliability values in the survivor memory unit (SMU). Simulation results are provided for bit error rate (BER) performance using constraint lengths of K=3, 4, and 5. Implementation results for K=5 are also provided showing 46% area and 15% power savings compared to a conventional SOVA decoder

Published in:

Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE  (Volume:4 )

Date of Conference:

2-2 Dec. 2005

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