Abstract
The Internet of Things (IoT) in the 5G communication is expected to support energy-constrained low complexity applications with satisfactory throughput efficiency. Hybrid automatic repeat request (HARQ) schemes are required to enable wireless reliability with high transmission efficiency in IoT. To improve the throughput performance between the low-power devices, in this paper, a systematic multi-packet HARQ (SMP-HARQ) scheme using polar codes is first proposed. Then, in order to obtain maximal throughput, parameter configuration of proposed HARQ scheme is optimized with low complexity. The optimization strategy can be applied into fading channels. Finally, numerical simulation results show that the proposed SMP-HARQ could improve throughput performance compared to existing HARQ schemes for IoT applications over both the AWGN and Rayleigh fading channels, particularly in the low SNR regions.
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