An experimental study on IEEE 802.15.4 multichannel transmission to improve RSSI-based service performance

Authors:
Andrea Bardella;Nicola Bui;Andrea Zanella;Michele Zorzi
Affiliations:
Dep. of Information Engineering, University of Padova, Italy;Dep. of Information Engineering, University of Padova, Italy and Patavina Technologies, Padova, Italy and Consorzio Ferrara Ricerche, Ferrara, Italy;Dep. of Information Engineering, University of Padova, Italy;Dep. of Information Engineering, University of Padova, Italy and Patavina Technologies, Padova, Italy and Consorzio Ferrara Ricerche, Ferrara, Italy
Venue:
REALWSN'10 Proceedings of the 4th international conference on Real-world wireless sensor networks
Year:
2010

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Abstract

In Wireless Sensor Networks (WSNs) the majority of the devices provide access to the Received Signal Strength Indicator (RSSI), which has been used as a means to enable different services and applications like localization, geographic routing and link quality estimation. Notwithstanding the popularity of using RSSI for localization, academic research showed that RSSI-based distance estimate is rather unreliable due to the random attenuation experienced by the radio signals, as the multipath fading. In this paper we propose a simple way to improve the RSSI reliability, averaging samples collected at different frequencies by a CC2420 radio, which implements the IEEE 802.15.4 standard, both in real indoor and outdoor scenarios. For this purpose, we introduce a simple communication protocol to coordinate data exchange between nodes, that exploits multichannel transmission in order to mitigate the multipath effect that hampers ranging estimation as well as wireless communication.