Hybrid Type-II ARQ Schemes for Rayleigh Fading Channels

In this paper the throughput performance of Simple Automatic Repeat reQuest (ARQ) and Hybrid type-II ARQ schemes over Rayleigh fading channels are studied. Some new hybrid type-II schemes based on Rate Compatible Punctured Convolutional (RCPC) codes are proposed which can be regarded as a combination of simple ARQ and traditional hybrid type-II ARQ schemes. It is shown that the suggested scheme provides a significantly better performance compared to other schemes. The transmitted bits are packed into channel blocks of fixed length. The effect of the channel block length on throughput is studied. Numerical results for normalized Doppler frequencies 0.001 and 0.01 are presented.