Steinmetz, FabianFabianSteinmetzRenner, Bernd-ChristianBernd-ChristianRenner2024-06-142024-06-142023-11-2817th International Conference on Underwater Networks & Systems, WUWNet 2023 Session I-A Acoustic Underwater Communications 1 (2023)https://hdl.handle.net/11420/44385Frequency shift chirp modulation (FSCM) is a new modulation technique utilized by the LoRa physical layer. It is widely used in radio low-power wide area networks (LPWANs). In preliminary publications, we developed a FSCM-based acoustic underwater transmitter and receiver. In most of the cases, the performance was studied in simulations. In this paper, we evaluate our differential FSCM implementation in different real-world scenarios with static and mobile communication links. First, we give an introduction of FSCM and describe the effect of the acoustic underwater transmission channel on FSCM symbols. Afterwards, we present challenging real-world transmission channels and study the communication performance.We show that our implementation can track and compensate Doppler shifts, is stable against multipath propagation and resilient in scenarios with low signal-to-noise ratio (SNR).enPhysicsConference Paper10.1145/3631726.3631740Conference Paper