Ultranarrowband Waveform for IoT Direct Random Multiple Access to GEO Satellites

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Abstract
Direct access of small terminals in the iot to geostationary satellites may provide wide coverage and almost 100% availability for remote locations without access to terrestrial networks. However, existing waveforms and iot solutions do not close the link to the geo for massively deployed small devices. We present a novel modulation and signaling scheme based on css that enables reliable transmission at ultra low bit-rate. The proposed structure for the transmit signal applies unipolar codes in a novel manner, which allows random multiple access to a common channel for a large number of devices. Further, the transmit signal is designed to allow robust signal detection with low effort even at high carrier frequency offsets. We propose a system concept for the receiver including synchronization, and provide the results of extensive simulations carried out on system and link levels. As a result, we demonstrate that the proposed scheme, referred to as Unipolar-coded Chirp-Spread Spectrum (UCSS), enables true random multiple access for a very large number of devices, closing the challenging link between IoT devices and satellites in the geo even at high carrier frequencies from C-band to Ka-Band.

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