NDLI: On finite-precision implementation of a decoder for turbo codes

Content Provider	IEEE Xplore Digital Library
Author	Jah-Ming Hsu Chin-Liang Wang
Copyright Year	1999
Description	Author affiliation: Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan (Jah-Ming Hsu)
Abstract	In this paper, we have investigated the finite-precision effects on a decoder for turbo codes based on the Log-BCJR algorithm. As for the numerical accuracy, we have empirically found that three bits are adequate for representing the decimal fractions of the variables in this algorithm. Furthermore, these variables have different numerical ranges for different signal-to-noise ratios, thus requiring different numbers of bits for representing them. By observing their minimum and maximum values through computer simulations, we have decided the proper number of bits for representing these variables. Simulation results have indicated that the scheme we have developed for determining the finite-precision parameter set of a turbo decoder based on the Log-BCJR algorithm is effective in approximating the performance of the same decoder with infinite-precision implementation.
Starting Page	423
Ending Page	426
File Size	345642
Page Count	4
File Format	PDF
ISBN	0780354710
DOI	10.1109/ISCAS.1999.780032
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-05-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Turbo codes Iterative decoding Iterative algorithms Signal to noise ratio Approximation algorithms Bit error rate Computer simulation Computational modeling Probability Degradation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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