论文标题
多路径通道的简单有效的LORA接收器方案
Simple and Efficient LoRa Receiver Scheme for Multi-Path Channel
论文作者
论文摘要
本文提出了一种新型的洛拉（远距离）接收器，以频率选择性多路径通道（MPC）运行。在MPC下，DeChired接收到的LORA波形式使我们可以使用MF（匹配的滤镜）方法来得出简单有效的LORA接收器方案，该方法旨在以DFT输出的符号指数频率以最大化SNR（信噪比）最大化。我们表明，MF接收器可以看作是耙结构，其中与DFT输出时与多径相关的干扰峰以建设性的方式重新组合。检测性能是由通道能量驱动的，并且这种新型MF/耙接收器比原始相干和非连接接收器的好处仅用于表现出重要路径能量的MPC。但是，这两个MF和Rake接收器具有不同的实现复杂性，这些复杂性已详细研究。从某种意义上说，根据复杂性约束，我们提供了用于实际操作的接收器变体的建议。最后，提出的MF/Rake接收器的表现优于MPC上TDEL（时间延迟估计LORA）接收器的先前结果，尤其是在低SNR和较高的Lora扩展因子（SF）参数下，以较高但合理的复杂性成本。
This paper presents a novel LoRa (Long Range) receiver operating in frequency selective Multi-Path Channel (MPC). The dechirped received LoRa wave-forms under MPC allows us to derive a simple and efficient LoRa receiver scheme by using a MF (Matched Filter) approach that aims to maximize the SNR (Signal-to-Noise Ratio) at the symbol index frequency of the DFT output. We show that the MF receiver can be seen as RAKE structure where interference peaks related to multipath, exhibited at DFT output, are recombined in a constructive way. Detection performance is driven by channel energy and the benefit of this novel MF/RAKE receiver over original coherent and non-coherent receiver appears only for MPC that exhibits significant paths energy. These two MF and RAKE receivers have however different implementation complexities that are studied in details. We provide in that sense recommendations on which receiver variant to use for real operations, depending on complexity constraints. Finally, the proposed MF/RAKE receiver outperforms previous results on TDEL (Time Delay Estimation LoRa) receiver over MPC, especially at low SNR and higher LoRa Spreading Factor (SF) parameter, at the cost of higher but reasonable complexity.
