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Due to the increase of Internet-of-Things (IoT) devices, IoT networks aregetting overcrowded. Networks can be extended with more gateways, increasingthe number of supported devices. However, as investigated in this work, massiveMIMO has the potential to increase the number of simultaneous connections,while also lowering the energy expenditure of these devices. We present a studyof the channel characteristics of massive MIMO in the unlicensed sub-GHz band.The goal is to support IoT applications with strict requirements in terms ofnumber of devices, power consumption, and reliability. The assessment is basedon experimental measurements using both a uniform linear and a rectangulararray. Our study demonstrates and validates the advantages of deploying massiveMIMO gateways to serve IoT nodes. While the results are general, here wespecifically focus on static nodes. The array gain and channel hardening effectyield opportunities to lower the transmit-power of IoT nodes while alsoincreasing reliability. The exploration confirms that exploiting large arraysbrings great opportunities to connect a massive number of IoT devices byseparating the nodes in the spatial domain. In addition, we give an outlook onhow static IoT nodes could be scheduled based on partial channel stateinformation.

Experimental Exploration of Unlicensed Sub-GHz Massive MIMO for Massive Internet-of-Things