Abstract
Improved minimum descriptive length (IMDL) is an enhancement of MDL stopping criterion for iterative turbo decoding. This stopping criterion works very well at a varying signal to noise ratios (SNRs) environment. IMDL uses a prescribed bit error rate as a threshold at high SNRs and a MDL criterion for stopping at low SNRs. However, there is no proposed method to determine the suitable threshold for the specific turbo code structure at high SNRs. Hence, the aim of this paper is to propose a method to find the best threshold for IMDL at high SNRs. This can be achieved by simulating the turbo code parameters with three tested thresholds which are 0.001, 0.0001 and 0.00001. The result obtained was recorded and analyzed to determine the best threshold for the specific turbo code structure. The proposed thresholds used in IMDL is capable reduce the average iteration number, thus produce better result in iterative turbo decoding.
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