A new LoRa-compatible modulation improving the LoRaWAN network level performance

In this paper we propose an improvement of the LoRa modulation called “Dual Orthogonal LoRa Modulation” which increases the link level bit rate of about 70%-80% at the expense of a 3dB penalty SNR. The Dual Orthogonal LoRa Modulation is introduced in a cross-layer design framework: this paper shows that - despite the penalty of 3dB in SNR - the overall performance of the LoRaWAN network are greatly improved in some real-life scenarios, taking into account the problems most highlighted for LoRaWAN networks i.e., the congestion and the scalability of LoRaWAN. The improvements at the network level are achieved thanks to the characteristics of the Dual Orthogonal LoRa Modulation which provide additional levels of freedom to the Spreading Factors assignment.