Comptes Rendus
no. 2
Turbo-FSK, a physical layer for low-power wide-area networks: Analysis and optimization
[Turbo-FSK, une couche physique pour les réseaux longue portée basse consommation : optimisation et comparaison]
Yoann Roth1, 2  ; Jean-Baptiste Doré1  ; Laurent Ros2  ; Vincent Berg1
1 CEA, LETI, MINATEC Campus, 38054 Grenoble, France
2 Univ. Grenoble Alpes, GIPSA-Lab, 38000 Grenoble, France
Comptes Rendus. Physique, Volume 18 (2017) no. 2, pp. 178-188.

L'Internet des objets devient une réalité, et depuis plusieurs années le besoin d'un nouveau réseau à longue portée et basse consommation est apparu. Le but de ce réseau est de connecter un grand nombre de nœuds à faible coût, tout en optimisant le bilan de liaison. La couche physique doit alors être définie comme très efficace énergétiquement. La combinaison de la modulation orthogonale de fréquence à M états avec un codage canal dans un processus conjoint, et non successif, à l'émission se révèle très efficace lorsqu'un récepteur itératif est utilisé. Cet article étudie cette technique Turbo-FSK avec l'outil d'analyse itérative EXIT (EXtrinsic Information Transfer, en anglais). La métrique est adaptée au cas de la M-FSK, et l'influence de la taille du paquet est étudiée. On montre alors que la technique reste performante, même lorsque que la taille de paquet est réduite. La comparaison avec des techniques actuelles est réalisée, montrant le potentiel de la technologie proposée.

As the Internet-of-Things is becoming a reality, the need for a new Low-Power Wide-Area (LPWA) network emerged in the last few years. Numerous low-cost devices will be connected, and this requires an optimization of the link budget: the physical layer needs to be designed highly energy efficient. The combination of M-ary orthogonal Frequency-Shift-Keying (M-FSK) modulation and coding in the same process has been shown to be a promising candidate when associated with an iterative receiver (turbo principle). In this work, we study this new digital transmission scheme, called Turbo-FSK. An EXtrinsic Information Transfer (EXIT) chart analysis is realized. The influence of the packet length is investigated, and the scheme is shown to stay energy efficiency even with short packet sizes. Comparison with LPWA current technologies is performed, showing the potential of this technology.

Publié le :
DOI : 10.1016/j.crhy.2016.11.005
Mots clés : Turbo FSK, Low rate, Internet-of-Things (IoT), Low-Power Wide-Area (LPWA)
Yoann Roth 1, 2 ; Jean-Baptiste Doré 1 ; Laurent Ros 2 ; Vincent Berg 1

1 CEA, LETI, MINATEC Campus, 38054 Grenoble, France
2 Univ. Grenoble Alpes, GIPSA-Lab, 38000 Grenoble, France 
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Yoann Roth; Jean-Baptiste Doré; Laurent Ros; Vincent Berg. Turbo-FSK, a physical layer for low-power wide-area networks: Analysis and optimization. Comptes Rendus. Physique, Volume 18 (2017) no. 2, pp. 178-188. doi : 10.1016/j.crhy.2016.11.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.11.005/

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