SDR-based IoT Communication Systems: An Application for the DASH7 Alliance Protocol

The Software-Defined Radio (SDR) technology has been a very popular and powerful prototyping device for decades. It has been applied in either fundamental research or application-oriented tasks. Additionally, the continuing rise of the Internet of Things is needed to validate, process and decode a large number of received signals. This is where SDRs can be a valuable instrument. In this work, we present an open-source software system using GNU Radio and SDRs, which improves the comprehension of the physical layer aspects of Internet of Things (IoT) communication systems. Our implementation is generic and application-agnostic. Therefore, it can serve as a learning and investigation instrument for any IoT communication system. Within this work, we have implemented the open-source DASH7 Alliance Protocol (D7AP). The developed software tool can simulate synthetic DASH7 signals, process recorded data sets, and decode the received DASH7 packets in real time using an SDR front-end. The software is accompanied by three data sets collected in a controlled, indoor and suburban environment. The experimental results reveal that the total packet loss of the data sets is 0%, 2.33% and 16.67%, respectively. Simultaneously, the three data sets have been received by a dedicated DASH7 gateway with a total packet loss of 0%, 3.83% and 7.92%, respectively.