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There is no standardized relationship of any particular physical parameter to the RSSI reading. The 802.11 standard does not define any relationship between RSSI value and power level in [[milliwatts]] or [[dBm|decibels referenced to one milliwatt (dBm)]]. Vendors and chipset makers provide their own accuracy, granularity, and range for the actual power (measured as milliwatts or decibels) and their range of RSSI values (from 0 to RSSI maximum).<ref>{{cite book|last1=Lui|first1=Gough|last2=Gallagher|first2=Thomas|last3=Binghao|first3=Li|title=2011 International Conference on Localization and GNSS (ICL-GNSS)|chapter=Differences in RSSI readings made by different Wi-Fi chipsets: A limitation of WLAN localization|pages=53–57|publisher=Localization and GNSS (ICL-GNSS), 2011 International Conference on |doi=10.1109/ICL-GNSS.2011.5955283|isbn=978-1-4577-0186-3|year=2011|s2cid=16846238}}</ref> One subtlety of the 802.11 RSSI metric comes from how it is sampled{{mdash}}RSSI is acquired during only the preamble stage of receiving an 802.11 frame, not over the full frame.<ref name=":0" />
As early as 2000, researchers were able to use RSSI for coarse-grained ___location estimates.<ref name=bahl-infocom2000>{{cite web|last1=Paramvir|first1=Bahl|last2=Padmanabhan|first2=Venkata|title=RADAR: An In-Building RF-based User Location and Tracking System|url=http://research.microsoft.com/en-us/people/padmanab/infocom2000.pdf|work=2000|accessdate=19 December 2014}}</ref> More recent work was able to reproduce these results using more advanced techniques.<ref name="sev-mobisys2013">{{cite
=== Received channel power indicator ===
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