Intra-System Interference Avoidance for Packet-Level Index Modulation in Internet of Things

The packet-level index modulation (PLIM) has been proposed as the efficient method to increase a few transferring bits in addition to data transmitted by packet. The time and frequency indexes are utilized to transmit additional bits. Moreover, in Internet-of-Things (IoT), Low Power Wide Area (LPWA) has been expected to be used. In IoT, the data transmission with PLIM leads to periodic packet loss when each node periodically transmits packets with the same indexes of PLIM. In this study, the method is proposed to avoid a periodic interference caused by PLIM for LPWA in IoT. The proposed method transmits packets with indexes shifted according to a node's ID and a transmission packet ID. Finally, this paper shows the simulation result to confirm the efficiency of the proposed method.