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Bit Error Rate Estimation for Turbo Decoding
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DOI：10.1109/TCOMM.2009.03.060410.png)
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Abstract
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In this paper we propose a method for on-line estimation of Bit Error Rate during turbo decoding. We model the log-likelihood ratios as a mixture of two Gaussian random variables and derive estimators for the mean and variance of these distributions based on a Maximum-Likelihood approach. The parameter estimates are then employed to calculate the cross-over area of the Gaussian tails to estimate BER at each decoder iteration. The performance of the BER estimator is analysed and compared.
Keywords:
Turbo codes
iterative decoding
BER estimation
Log-likelihood ratio
Gaussian approximation
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