In this paper, a type-II H-ARQ scheme with incremental redundancy is proposed for a turbo coded system that uses the sub-block structure. Sub-block recovery is applied to the decoder and a method to dynamically select the bits for retransmission according to knowledge of the decoding status is proposed. The new scheme benefits from both the frequent termination technique and the built-in CRC of the constituent recursive systematic convolutional codes of the turbo encoder. Simulations show that for a turbo coded system that employs the sub-block structure, the new type-II H-ARQ scheme outperforms both type-I H-ARQ with the sub-block recovery and the traditional type-II H-ARQ scheme without sub-block recovery on both the AWGN channel and the flat Rayleigh fading channel.
['Chunlong Bai', 'Bartosz Mielczarek', 'Ivan J. Fair', 'Witold A. Krzymien']
WLC45-1: Turbo Coded Type-II H-ARQ Scheme with Incremental Redundancy Using Sub-Block Recovery