低功耗广域网抗干扰的部分符号恢复
Partial Symbol Recovery for Interference Resilience in Low-Power Wide Area Networks
摘要：
近年来，低功耗广域网（LPWAN）在各种物联网（IoT）应用的非授权频段中激增。由于超低的传输功率和长的传输持续时间，LPWAN设备不可避免地遭受高功率的交叉技术干扰（CTI），例如来自Wi-Fi的干扰，共存于同一频谱中。为了缓解这个问题，本文介绍了部分符号恢复（PSR）方案，以提高CTI弹性的LPWAN。我们在LoRa上验证了我们的想法，LoRa是一种广泛采用的LPWAN技术，作为概念证明。在PHY层，尽管CTI具有高得多的功率，但与LoRa符号相比，其持续时间相对较短，使得LoRa符号的一部分未被损坏。此外，由于其高冗余性，符号内的LoRa芯片高度相关。这开启了仅用部分芯片检测LoRa符号的可能性。通过使用时频分析检查LoRa符号中的独特频率模式，我们的设计有效地检测出没有CTI的干净LoRa芯片。这使得PSR能够仅依赖干净的LoRa芯片成功地从通信故障中恢复。我们使用真实世界的测试平台评估我们的PSR设计，包括SX 1280 LoRa芯片和USRP B210，在各种情况下的Wi-Fi干扰下。大量的实验表明，我们的设计提供了可靠的数据包恢复性能，成功地将LoRa数据包接收率从45.2%提高到82.2%，性能增益为1.8倍。
英文摘要：
Recent years have witnessed the proliferation of Low-power Wide Area Networks (LPWANs) in the unlicensed band for various Internet-of-Things (IoT) applications. Due to the ultra-low transmission power and long transmission duration, LPWAN devices inevitably suffer from high power Cross Technology Interference (CTI), such as interference from Wi-Fi, coexisting in the same spectrum. To alleviate this issue, this paper introduces the Partial Symbol Recovery (PSR) scheme for improving the CTI resilience of LPWAN. We verify our idea on LoRa, a widely adopted LPWAN technique, as a proof of concept. At the PHY layer, although CTI has much higher power, its duration is relatively shorter compared with LoRa symbols, leaving part of a LoRa symbol uncorrupted. Moreover, due to its high redundancy, LoRa chips within a symbol are highly correlated. This opens the possibility of detecting a LoRa symbol with only part of the chips. By examining the unique frequency patterns in LoRa symbols with time-frequency analysis, our design effectively detects the clean LoRa chips that are free of CTI. This enables PSR to only rely on clean LoRa chips for successfully recovering from communication failures. We evaluate our PSR design with real-world testbeds, including SX1280 LoRa chips and USRP B210, under Wi-Fi interference in various scenarios. Extensive experiments demonstrate that our design offers reliable packet recovery performance, successfully boosting the LoRa packet reception ratio from 45.2% to 82.2% with a performance gain of 1.8 times.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
