Re-transmission diversity with fast channel selectivity for reliable industrial WLAN system

Abstract

This paper proposes a fast and low-complexity retransmission scheme for Industrial WLAN system. The proposed scheme exploits the frequency diversity and employs channel selectivity in order to achieve high-reliability and low-latency communication. The channel selectivity is carried out instantly by re-scheduling sub-carrier allocation during OFDM transmission in order to obtain diversity gain. Evaluation results show that the performance of the proposed scheme in terms of system-error rate and achievable transmission throughput rate, are significantly improved from the conventional re-transmission scheme. Furthermore, the proposed method only need a minor modification in both of communication protocol and transceiver design from the existing Industrial WLAN system. Hence, the low-complexity transmission scheme could be realized in current OFDM-based wireless system.