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Design and Evaluation of Adaptive (Serial/Parallel) Concatenated Convolutional Codec | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 10, Issue 2, 2006, Pages 100-122 | ||
| Authors | ||
| Raghad Z.Yousif; Khamis A. Zidan | ||
| Abstract | ||
| In this paper, parallel Concatenated Convolutional Codes (PCCCs) is modeled as aspecial case of Serial Concatenated Convolutional Code (SCCCs). Consequently, resultingin Adaptive (parallel/serial) concatenated convolutional code in which the same encoderand decoder can be used for both types of concatenated convolutional codes. To achievethis goal some interleaver restrictions are made to modify the classical structure ofSemi-Random interleaver. The decoding stage is based on classical SCCC iterative decoder,with added interleaver restrictions. The core of decoder structure is a soft-input soft-output(SISO) a posteriori probability (APP) module. Log-Map is used as (APP) for its superiorperformance.This work also presents some classical structured interleavers such as Block and Circular interleavers, adding to them the presented restrictions for sake of comparison. The resulted performance curves from computer simulation, shows that degradation signal per bit energy to noise ratio (Eb/No) for the proposed decoder as compared to the classical PCCC is no more than 0.45 dB at less than 10-5 bit error rates (BER),over Fading channel in worst case. | ||
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