Leveraging signal delay and power features for multiuser detection in LoRaWAN

Long Range (LoRa) technology is widely adopted in Low Power Wide Area Networks due to its robustness, energy efficiency, and long-range capabilities. However, its lightweight ALOHA-based medium access scheme makes it vulnerable to packet collisions, especially in dense deployments with multiple simultaneous transmissions. Efficient multiuser detection strategies are therefore essential to enhance system scalability and reliability. In this paper, we propose a novel multiuser detection scheme for LoRa systems that exploits the time offset information of received packets, obtained through an effective synchronization method, to mitigate mutual symbol interference. The proposed approach incorporates successive interference cancellation, performed at symbol level, that jointly leverages both power and delay characteristics of overlapping signals. Such combined use of temporal and power-domain knowledge enhances the capability to separate superposed transmissions, thereby improving detection performance in multiuser scenarios.