Turbo-FSK, a physical layer for LPWA: Synchronization and Channel estimation

Francois Dehmas (1) , Valérian Mannoni (1) , Vincent Berg (1)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information

—Turbo Frequency Shift Keying (Turbo-FSK) has been considered as a promising physical layer for low power wide area applications. Its constant envelope at the transmitter combined with performance close to the Shannon's limit enable to achieve a high energy efficiency. However, results published so far in the literature for this waveform have assumed perfect synchronization and channel estimation. This paper, presents a synchronization and channel estimation approach based on a specifically built preamble and adapted to the performance of the new modulation. Simulations have been performed for both time and frequency synchronization as well as channel estimation. Less than 1 dB degradation in comparison to perfect detection is achieved for the most severe types of channels.

Keywords: LPWA; OFDM; Turbo Codes; FSK; Zadoff-Chu; Constant Envelope

Domains: Information Theory [math.IT]; Signal and Image processing; Electronics

Francois Dehmas, Valérian Mannoni, Vincent Berg. Turbo-FSK, a physical layer for LPWA: Synchronization and Channel estimation. EUCNC 2018 - European Conference on Networks and Communications, Jun 2018, Ljubljana, Slovenia. ⟨cea-01846011⟩