固件提升洛拉直接卫星连接
Semtech已为其LORA收发器和网关开发了软件升级，该软件可显着提高干扰性的鲁棒性，并使从传感器到卫星的低功率和可靠的直接数据链接。
The embedded upgrade can be used by second generation LoRa ICs to enable the LoRaWAN standard new data rate, Long Range Frequency Hopping Spread Spectrum (LR-FHSS), recently ratified by the LoRa Alliance. This allows more robust, longer range operation for applications such as smart meters as well as direct links to satellites in low earth orbit (LEO) that have a LoRa payload such as those from Lacuna Space and Swarm, now owned by SpaceX.
LR-FHSS features high interference resistance that alleviate packet collisions by increasing spectral efficiency with the ability for uplink frequency hopping modulation. This is accomplished by breaking up each data packet being sent from an end node into small pieces (each piece is around 50 millisecond long) and randomly spreading them over a defined frequency bandwidth which includes 137kHz, 336kHz and 1.523MHz depending on the region. In addition, LR-FHSS uses redundant physical headers on different frequencies to further improve the modulation robustness to in-band interference.
LR-FHSS也是通过使用工业，科学和医学（ISM）无执照的频段或许可频谱来提供从最终节点到卫星的直接数据链接的关键，并且可以在IoT服务中支持数百万的终点节点。
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“We now have trials and demonstrations underway in many countries and regions that were previously thought to be inaccessible to IoT. Our collaboration with Semtech and the enablement of its LR-FHSS device accelerates IoT adoption for a safer, more resilient and resource-efficient world,” said Rob Spurrett, CEO at Lacuna Space. “With this collaboration, we expect to begin commercial services within the first half of 2022.”
Semtech的无线和感应产品组的物联网产品营销和战略副总裁MarcPégulu表示：“在Lorawan标准中添加LR-FHSS进一步提高了无处不在的连通性的容量和弹性。”“ Lacuna对这项负担得起的简化技术的应用将通过其卫星技术进一步扩大连接的访问。”
将LR-FHSS添加到现有的Lorawan网络中可以帮助扩大容量，而无需替代现有的网络基础架构。LORA调制和LR-FHSS调制可以同时共存。在末端节点处的LORA调制和LR-FHSS调制之间切换需要网络服务器的单个ADR命令。具有LORA调制的网关和带有LR-FHSS调制的网关可以在同一Lorawan网络中共存，这也可以帮助释放Lora调制通道。例如，可以用LORAWAN网络中的LR-FHS替换SF10，SF11和SF12，从而大大扩展了网络容量。
Semtech的LORA收发器将启用一套新的工具：SX1261，SX1262，Lora Edge平台和v2.1网关参考设计。对于部署v2.1网关的Lorawan网络，操作员可以通过简单的网关固件升级来启用新功能。除了扩大容量外，Lorawan网络还将在诸如室内深处和地下室的智能电表和某些地区的地下室等苛刻的无线电条件下更强大，这将提供增加陆地覆盖范围的可能性。
Pégulu说：“随着智慧城市趋势在全球范围内继续扩散，新的能力是Semtech洛拉平台迈向人口稠密地区大规模物联网（IoT）部署的一步。”“此外，直接物联网卫星服务的启用使该行业彻底改变了偏远地区的无处不在的连通性，最终创造了一个更聪明，更安全的星球。”
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