Convolutional Coding in Hybrid Type-II ARQ Schemes on Wireless Channels

In our previous work, we have proposed a hybrid typeII Automatic Repeat reQuest (ARQ) scheme (Scheme 5) based on the Rate Compatible Punctured Convolutional (RCPC) codes which performs significantly better than all the other ARQ schemes in all the channel conditions. In this work, we study the performance of Scheme 5 based on High Rate Optimized RCPC (HRO-RCPC) codes combined with simple repetition codes in more detail. The performance is investigated for different packet sizes and constraint lengths of the convolutional encoder in various fading environments. We have also studied the performance of the HRO-RCPC codes combined with optimized Rate Compatible Repetition Convolutional (RCRC) codes as another alternative for channel coding in hybrid type-II ARQ schemes. The corresponding simulation results show that these codes with high parent code rate perform almost as good as the HRO-RCPC codes with simple repetition codes at lower parent code rate.