Improved Multi-Channel Ranging Precision Bound for Narrowband LPWAN in Multipath Scenarios

Florian Wolf , Christophe Villien (1) , Sébastien de Rivaz , Francois Dehmas (1) , Jean-Pierre Cances (2)

1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 XLIM-SRI - Systèmes et Réseaux Intelligents

Accurate range estimation with narrowband low power radio devices is challenging due to limited signal bandwidth and high frequency offsets of low-cost oscillators. The present paper provides new results concerning the Cramer Rao bounds of narrowband ranging systems applying a multi-channel coherent processing approach. Particularly, compared to existing literature, oscillator frequency offsets and multipath influence are taken into account. By numerical simulation it is shown, how the radio channel frequency selectivity degrades the ranging precision. Finally, a few guidelines for the design of new long range low-cost ranging systems are provided.

Mots clés: range estimation; phase of arrival; channel estimation; LPWAN localization; CRLB

Domaines: Traitement du signal et de l'image [eess.SP]; Electromagnétisme

Florian Wolf, Christophe Villien, Sébastien de Rivaz, Francois Dehmas, Jean-Pierre Cances. Improved Multi-Channel Ranging Precision Bound for Narrowband LPWAN in Multipath Scenarios. 2018 Wireless Communications and Networking Conference (WCNC), Apr 2018, Barcelona, Spain. ⟨10.1109/WCNC.2018.8377203⟩. ⟨hal-02059002⟩