MaLoRaGW: Multi-User MIMO Transmission for LoRa
MaLoRaGW: Multi-User MIMO Transmission for LoRa
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DOI：
10.1145/3560905.3568533
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Hossein Pirayesh;Shichen Zhang;Pedram Kheirkhah Sangdeh;Huacheng Zeng
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作者：
Hossein Pirayesh;Shichen Zhang;Pedram Kheirkhah Sangdeh;Huacheng Zeng
LoRa已成为一种关键的无线通信技术，用于使网关为地理上分布的物联网设备提供低速率、远距离连接。在本文中，我们介绍MaLoRaGW，这是首个多天线LoRa网关，它能够在上行链路和下行链路中实现多用户MIMO（MU - MIMO）LoRa通信。MaLoRaGW的灵感来自于MU - MIMO在蜂窝网络和Wi - Fi网络中的成功应用。MaLoRaGW的关键组件是一种用于上行链路分组检测和下行链路波束成形的联合基带物理层（PHY）设计。其创新在于三个模块：空间信号投影、精确的信道估计和隐式波束成形，所有这些都仅存在于LoRa网关中，并且不需要对LoRa客户端设备进行修改。我们在通用软件无线电外设（USRP）设备上构建了一个双天线MaLoRaGW的原型，并在实验室、办公楼和大学校园这三种场景下使用商用LoRa加密狗对其性能进行了广泛评估。我们的实验结果表明，与现有技术相比，双天线MaLoRaGW使上行链路吞吐量提高了10%，下行链路吞吐量提高了95%。
LoRa has emerged as a key wireless communication technology for a gateway to provide geographically-distributed IoT devices with low-rate, long-range connections. In this paper, we present MaLoRaGW, the first-of-its-kind Multi-antenna LoRa GateWay that enables multi-user MIMO (MU-MIMO) LoRa communications in both uplink and downlink. MaLoRaGW was inspired by the success of MU-MIMO in cellular and Wi-Fi networks. The key component of MaLoRaGW is a joint baseband PHY design for uplink packet detection and downlink beamforming. Its innovation lies in three modules: spatial signal projection, accurate channel estimation, and implicit beamforming, all of which reside only in a LoRa gateway and require no modification on LoRa client devices. We have built a prototype of two-antenna MaLoRaGW on a USRP device and extensively evaluated its performance with commercial LoRa dongles in three scenarios: lab, office building, and university campus. Our experimental results show that, compared to the state-of-the-art, the two-antenna MaLoRaGW increases uplink throughput by 10% and downlink throughput by 95%.