An ARQ scheme using fixed-boundary subpackets with pilot symbol assisted modulation for Rayleigh channels

A novel scheme of ARQ protocol using fixed-boundary subpackets to partition a packet for re-transmissions is presented. Monte Carlo simulations of transmitting PSAM signals using QPSK over Rayleigh channels with up to 3% Doppler have been used to evaluate the performance of the proposed technique. Benchmarking against an ARQ protocol using CRC for error detection, this subpacket ARQ scheme provides up to 35% and 7% better in throughput for packets that are longer than 1024 when the channel SNR is greater than 25dB without Doppler and with 1% Doppler respectively. Future extensions of this subpacket re-transmission scheme with PSAM may lead to higher throughput in other ARQ protocols currently using CRC for error detection.