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Low latency IR-HARQ scheme for WLAN system

This paper proposes a low latency incremental redundancy hybrid ARQ (IR-HARQ) scheme for the wireless local area network (WLAN) system. The proposed scheme adopt the rate compatible low-density parity-check (RC-LDPC) code based on IEEE802.11n LDPC codes and ensure backward compatibility with WLAN devices by using the current WLAN control frame. Additionally, it enables to minimize the retransmission latency by selection of an optimal retransmission data length based on the mutual information (MI). Through computer simulations, it has confirmed that the proposed scheme can reduce the required SNR by 2.6 dB to achieve a system throughput of 15 Mbps compared with the retransmission scheme of the current WLAN system.