LoRa的可靠性分析
Analysis of the reliability of LoRa
摘要：
本文研究了单网关LoRa系统在不同干扰下的性能，并考虑了非正交效应。它利用随机几何的概念，提出了一个低复杂度的近似封闭形式的模型，用于计算在这些具有挑战性的条件下的成功和覆盖概率。蒙特卡洛模拟结果表明，LoRa并不像理论上描述的那样是一种可以覆盖几到十公里的技术。有人发现，在组合的信号噪声比（SNR）和扩频因子（SF）之间的不完美的正交性的存在下，性能急剧下降超过几公里。然而，当考虑完美正交性并且不包括SNR时，观察到更好的性能。此外，性能取决于环，并且在部署单元环的边界处略有改善。最后，覆盖概率随着终端设备的平均数量的增长而呈指数下降。
英文摘要：
This letter studies the performance of a single gateway LoRa system in the presence of different interference considering the imperfect orthogonality effect. It utilizes concepts of stochastic geometry to present a low-complexity approximate closed-form model for computing the success and coverage probabilities under these challenging conditions. Monte Carlo simulation results have shown that LoRa is not as theoretically described as a technology that can cover few to ten kilometers. It was found that in the presence of the combination of signal-to-noise ratio (SNR) and imperfect orthogonality between spreading factors (SF), the performance degrades dramatically beyond a couple of kilometers. However, better performance is observed when perfect orthogonality is considered and SNR is not included. Furthermore, the performance is annulus dependent and slightly improves at the border of the deployment cell annuli. Finally, the coverage probability declines exponentially as the average number of end devices grows.
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