多径和干扰信道下LoRa系统的理论性能
Theoretical Performance of LoRa System in Multi-Path and Interference Channels
摘要：
针对LoRa物联网（IoT）调制方案，提出了在以下两种情况下的误符号率（SER）的半解析近似：1）在具有加性高斯白噪声（AW GN）的多径频率选择性衰落信道中; 2）在平坦衰落AW GN信道中存在第二个干扰LoRa用户。通过考虑基于接收到的LoRa波形的常见离散傅里叶变换（DF T）的检测器，推导出相干和非相干情况下的性能。通过考虑这两种情况，检测器表现出严重降低LoRa接收器性能的寄生峰值。在这个意义上，我们提出了这个结果的理论表达，从一个统一的框架，峰值检测概率的基础上，使我们能够推导出SER，这是通过蒙特卡罗模拟验证。快速计算的派生的封闭形式SER允许进行深入的性能分析，这两种情况。
英文摘要：
This paper presents a semi-analytical approximation of Symbol Error Rate (SER) for the well known LoRa Internet of Things (IoT) modulation scheme in the following two scenarios: 1) in multi-path frequency selective fading channel with Additive White Gaussian Noise (AW GN) and 2) in the presence of a second interfering LoRa user in flat-fading AW GN channel. Performances for both coherent and non-coherent cases are derived by considering the common Discrete Fourier transform (DF T) based detector on the received LoRa waveform. By considering these two scenarios, the detector exhibits parasitic peaks that severely degrade the performance of the LoRa receiver. We propose in that sense a theoretical expression for this result, from which a unified framework based on peak detection probabilities allows us to derive SER, which is validated by Monte Carlo simulations. Fast computation of the derived closedform SER allows to carry out deep performance analysis for these two scenarios.
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