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by Guang-chong Zhu, Fady Alajaji
Proc. 39th Allerton Conf. Commun., Control, and Computing
http://markov.mast.queensu.ca/Papers/nuniid-allerton01.ps
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Abstract:
This work addresses the problem of designing Turbo codes for non-uniform binary memoryless or independent and identically distributed (i.i.d.) sources over noisy channels. The extrinsic information in the decoder is modied to exploit the source redundancy in the form of non-uniformity; furthermore, the constituent encoder structure is optimized for the considered non-uniform i.i.d. source to further enhance the system performance. Some constituent encoders are found to substantially outperform Berrou's (37; 21) encoder. Indeed, it is shown that the bit error rate (BER) performance of the newly designed Turbo codes is greatly improved as signicant coding gains are obtained. Comparisons to the optimal Shannon limit are also provided.
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