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Linearly approximated log-MAP algorithms for turbo decoding

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2 Author(s)
Jung-Fu Cheng ; Ericsson Inc., NC, USA ; Ottosson, T.

Different floating-point and fixed-point implementation issues of the log-MAP algorithm for decoding turbo codes are studied. A theoretical framework is proposed to explain why the log-MAP turbo decoders are more tolerant of overestimation of SNR than underestimation. A linear approximation (the Log-Lin algorithm) that allows for efficient ASIC implementations and results in negligible performance loss in floating-point models is proposed. It is further shown that a fixed-point implementation of this Log-Lin algorithm, including clipping and quantization of the received samples to 6 bits, results in a loss of performance of less than 0.05 dB

Published in:

Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st  (Volume:3 )

Date of Conference:

2000