This work studies the problem of LQG control when the link between the sensor and the controller relies on a Wi-Fi network. Unfortunately, the communication on a wireless medium is sensitive to noise in the transmission band, which is characterized by the Signal-to-Noise Ratio (SNR). Wi-Fi allows to switch among different bit-rates in real-time thus permitting to trade-off lower loss probabilities for larger latency or vice-versa to achieve better closed-loop performance. To exploit this feature, under a constant SNR scenario, we propose a cross-layer approach where the bit-rate is optimally selected based on a control performance metric (i.e. minimum LQG cost) and a model-based controller is used to compensate for the packet losses. Under time-varying SNR, we additionally propose a (sub-optimal) on-line rate adaptation strategy and we guarantee the closed-loop stability under some mild conditions. Numerical comparisons with emulation-based approaches using TrueTime, a realistic Matlab-based Wi-Fi simulator, are included to show the benefits of the adaptive approach under time-varying SNR scenarios.
Adaptive transmission rate for LQG control over Wi-Fi: A cross-layer approach / Pezzutto, M.; Tramarin, F.; Dey, S.; Schenato, L.. - In: AUTOMATICA. - ISSN 0005-1098. - 119(2020), pp. 1-12.
Data di pubblicazione: | 2020 |
Titolo: | Adaptive transmission rate for LQG control over Wi-Fi: A cross-layer approach |
Autore/i: | Pezzutto, M.; Tramarin, F.; Dey, S.; Schenato, L. |
Autore/i UNIMORE: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.automatica.2020.109092 |
Rivista: | |
Volume: | 119 |
Pagina iniziale: | 1 |
Pagina finale: | 12 |
Codice identificativo ISI: | WOS:000551496400039 |
Codice identificativo Scopus: | 2-s2.0-85086632897 |
Citazione: | Adaptive transmission rate for LQG control over Wi-Fi: A cross-layer approach / Pezzutto, M.; Tramarin, F.; Dey, S.; Schenato, L.. - In: AUTOMATICA. - ISSN 0005-1098. - 119(2020), pp. 1-12. |
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