Design on Rateless LDPC Codes for Reliable WiFi Backscatter Communications

This paper designs a rateless low density parity check (LDPC) code for the information transmission of the WiFi backscatter communications. Since WiFi has the characteristics of burst data packages and low anti-jamming capability, the reliability becomes a problem. Therefore, the encoding is significantly crucial when using WiFi signals as the excitation in backscatter communications. Rateless LDPC code can be applied to not only solve these two shortcomings, but also adjust the link state and the bit rate without knowing the channel state information. It ensures that transmission resources are not wasted and the computational resources are saved. We conduct simulation experiments and the obtained results show that the rateless LDPC still performs well under the restriction of the number of retransmissions. Furthermore, the proposed scheme works against the intermittent nature of WiFi excitation signals.