Abstract
Internet-of-Things (IoT) represents a breakthrough for the current ICT market. In many IoT applications, sensors and actuators are distributed over very wide areas, sometimes not reached by terrestrial networks. In such scenarios, the satellite plays a significant role. In this paper, a Software-Defined Radio (SDR) - based satellite gateway for Internet-of-Remote-Things (IoRT) is proposed. The use of SDR allows to decrease equipment cost and provides higher flexibility. The proposed architecture has been implemented by using a standalone SDR platform and Commercial Off-The-Shelf (COTS) modules for covering the main terrestrial IoT standards. Extensive proof-of-concept results are presented and discussed. Uplink and downlink tests showed the correct functionality implementation and transmitted signal generation, while the integration tests allowed to assess the reliability of the end-to-end information processing. Reconfigurability tests confirmed the capability of the gateway of dynamically updating in real-time its protocol settings. The overall test results showed the validity of the proposed SDR-based gateway for IoRT applications.
Highlights
In these last ten years, a second revolution in Internet technology has grown around the concept of Internet of Things (IoT) [1]
In order to increase the spectral efficiency of satellite-based IoT systems, a novel forward link multiplexed scheme is presented in [14], where the signals of different users can be simultaneously transmitted over the satellite link using the same frequency by means of constellation coding
A new module may be required for ensuring support for a different uplink/downlink protocol or for adding an Field Programmable Gate Arrays (FPGAs) base implementation for an IoT protocol which was previously supported via a Commercial Off-The-Shelf (COTS) module
Summary
In these last ten years, a second revolution in Internet technology has grown around the concept of Internet of Things (IoT) [1]. Over wide geographical areas or they are inaccessible Such a situation is referred in [2] as Internet of Remote Things (IoRT). In this framework, satellite communication could offer a broadband cost-effective solution for the interconnection of networks of smart objects with the rest of the world. The proposed and tested SDR gateway can find application in heterogeneous distributed IoRT scenarios, where a plethora of sparse devices, transmitting information using different protocols and standards over wide areas, is considered. At the best of our knowledge, the state-of-the-art SDR-based solutions for IoT do not tackle such kind of long-range and sparse multi-standard scenarios, being mainly focused on providing connectivity among devices operating in dense areas of limited extension.
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