LoRa has been widely used in the Internet of Things (IoT). However, since LoRa only supports single symbol transmission in its bandwidth, the bit rate of LoRa is limited. This restricts the future development of LoRa, such as Smart Home, Internet of Vehicles, Satellite IoT, etc. Toward this end, based on the energy convergence characteristic of LoRa symbol in the fractional domain, we propose a multiplexed LoRa (MuLoRa) which transmits multiple LoRa symbols simultaneously in the same bandwidth. By adding address bits, the collision between multiple LoRa symbols of MuLoRa is avoided. Considering the hardware consumption of MuLoRa modulation in the time domain, a fractional domain MuLoRa modulation method based on fractional Fourier transform (FRFT) is designed. Simulation results show that MuLoRa can significantly improve the transmission bit rate than conventional LoRa under the same bandwidth. And MuLoRa can be configured more flexibly to meet the performance requirements of rate, power, collision avoidance and BER in different application scenarios in the future high data rate IoT era.

中文翻译：

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一种基于分数阶傅立叶变换的新型 MuLoRa 调制

LoRa 已广泛应用于物联网 (IoT)。但是，由于 LoRa 在其带宽内仅支持单符号传输，因此 LoRa 的比特率是有限的。这制约了 LoRa 未来的发展，如智能家居、车联网、卫星物联网等。 为此，基于 LoRa 符号在分数域中的能量收敛特性，我们提出了一种多路复用 LoRa（MuLoRa），它传输在同一带宽中同时使用多个 LoRa 符号。通过添加地址位，避免了 MuLoRa 的多个 LoRa 符号之间的冲突。考虑到MuLoRa调制在时域上的硬件消耗，设计了一种基于分数傅里叶变换(FRFT)的分数域MuLoRa调制方法。仿真结果表明，在相同带宽下，MuLoRa 可以比传统 LoRa 显着提高传输比特率。并且MuLoRa可以更灵活地配置，以满足未来高速率物联网时代不同应用场景下的速率、功率、防撞、误码率等性能需求。