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Extrinsic Information Transfer Analysis and Design of Block-Based Intermediate Codes

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2 Author(s)
Maunder, R.G. ; Sch. of Electron. & Comput. Sci., Univ. of Southampton, Southampton, UK ; Hanzo, L.

Intermediate codes have been shown to facilitate iterative decoding convergence to the maximum-likelihood (ML) error ratio performance in serially concatenated schemes. In this paper, we propose a novel block-based intermediate code as an alternative to classic convolutional intermediate codes. Because it is block-based, our intermediate code facilitates practical implementations with reduced memory and processing requirements. Furthermore, we demonstrate that it is simpler to analyze and optimize the iterative decoding process when our block-based intermediate code is employed, instead of a convolutional intermediate code. Finally, we demonstrate that the proposed block-based intermediate code facilitates significantly reduced error ratios in practical schemes when employing short transmission frames and a limited decoding complexity.

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Vehicular Technology, IEEE Transactions on  (Volume:60 ,  Issue: 3 )