Comparison of decoding turbo Gallager codes in hybrid decoding arrangements with different iterative decoders over the erasure channel |
In this paper, different iterative decoders for turbo Gallager codes are optimised and compared for the binary erasure channel. The complexity and performance differences between turbo decoder, BCJR-based Look-Up Table decoder and belief propagation decoder are analysed and evaluated. A hybrid decoding arrangement, which uses an iterative decoder followed by a maximum likelihood ldquoIn-Placerdquo matrix inversion algorithm, is compared for the different iterative decoders. Results are presented which show that the BCJR-based iterative decoders achieve better performance than using the belief propagation decoder for turbo Gallager codes in the erasure channel. When small encoder memory is selected, the optimised Look-Up Table decoder provides a good balance between convergence performance and complexity.
Yang L, Ambroze MA, Tomlinson M