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On the Mechanisms and Effects of Calibrating RSSI Measurements for 802.15.4 Radios
 

Summary: On the Mechanisms and Effects of Calibrating
RSSI Measurements for 802.15.4 Radios
Yin Chen Andreas Terzis
Computer Science Department
Johns Hopkins University
{yinchen,terzis}@jhu.edu
Abstract. Wireless sensor network protocols and applications, includ-
ing those used for localization, topology control, link scheduling, and link
quality estimation, make extensive use of Received Signal Strength In-
dication (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 protocols
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 consistent across radios
of the same model, making RSSI calibration practical. We present a cal-
ibration mechanism that removes the artifacts in the raw RSSI measure-
ments, including ambiguities created by the non-injective regions in the
response curves, and generates calibrated RSSI readings that are linear.

  

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

 

Collections: Computer Technologies and Information Sciences