Woven convolutional codes. II: decoding aspects

R Jordan, S HOst, R Johannesson… - IEEE transactions on …, 2004 - ieeexplore.ieee.org
R Jordan, S HOst, R Johannesson, M Bossert, VV Zyablov
IEEE transactions on information theory, 2004ieeexplore.ieee.org
An iterative decoding scheme for woven convolutional codes is presented. It operates in a
window sliding over the received sequence. This exploits the nature of convolutional
codewords as infinite sequences and reflects the concept of considering convolutional
encoding and decoding as a continuous process. The decoder is analyzed in terms of
decoding delay and decoding complexity. Its basic building block is a symbol-by-symbol a
posteriori probability (APP) decoder for convolutional codes, which is a windowed variant of …
An iterative decoding scheme for woven convolutional codes is presented. It operates in a window sliding over the received sequence. This exploits the nature of convolutional codewords as infinite sequences and reflects the concept of considering convolutional encoding and decoding as a continuous process. The decoder is analyzed in terms of decoding delay and decoding complexity. Its basic building block is a symbol-by-symbol a posteriori probability (APP) decoder for convolutional codes, which is a windowed variant of the well-known Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm. Additional interleaving for the woven constructions is introduced by employing convolutional scramblers. It is shown that row-wise random interleaving preserves the lower bound on the free distance of the original woven constructions. Based on the properties of the interleavers, new lower bounds on the free distance of woven constructions with both outer warp and inner warp are derived. Simulation results for woven convolutional codes with and without additional interleaving are presented.
ieeexplore.ieee.org
以上显示的是最相近的搜索结果。 查看全部搜索结果