Combining techniques and segment selective repeat on turbo coded hybrid ARQ

A turbo coded hybrid automatic repeat request (TC-HARQ) scheme is proposed based on packet combining technique and segment selective repeat. First, we demonstrate through simulation that, data combining gives substantial performance improvement over log-likelihood ratio (LLR) combining with the cost of more buffers. Second, we propose a novel retransmission strategy for TC-HARQ: segment selective repeat (SSR), which intends to select the worst corrupted part of the packet for retransmission. We show that SSR increases system throughput and has a potential to perform better with more sophisticated use of LLR.