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Calibrating RSSI Measurements for 802.15.4 Radios
 

Summary: Calibrating RSSI Measurements for
802.15.4 Radios
Yin Chen Andreas Terzis
yinchen@cs.jhu.edu terzis@cs.jhu.edu
Abstract
Wireless sensor network protocols and applications, including those
used for localization, topology control, link scheduling, and link qual-
ity estimation, make extensive use of Received Signal Strength Indi-
cation (RSSI) measurements. In this paper we show that inaccuracies
in the RSSI values reported by widely used 802.15.4 radios, such as
the CC2420 and the AT86RF230, have profound impact on these pro-
tocols and applications. Furthermore, we experimentally derive the
response curves which translate actual RSSI values to the raw RSSI
readings that the radios report and show that they contain non-linear
and even non-injective regions. Fortunately, these curves are consis-
tent across radios of the same model, making RSSI calibration prac-
tical. We present a calibration mechanism that removes the artifacts
in the raw RSSI measurements, including ambiguities created by the
non-injective regions in the response curves, and generates calibrated
RSSI readings that are linear. This calibration removes many of the

  

Source: Amir, Yair - Department of Computer Science, Johns Hopkins University

 

Collections: Computer Technologies and Information Sciences