Re: CoreBluetooth - Whose RSSI reads ?
Re: CoreBluetooth - Whose RSSI reads ?
- Subject: Re: CoreBluetooth - Whose RSSI reads ?
- From: Scott Perry <email@hidden>
- Date: Thu, 30 May 2013 15:47:51 -0700
Sorry I misspoke, RSSI is simply a measure of the signal's SNR.
It can be used (along with the Tx power data present in the advertising packet (CBAdvertisementDataTxPowerLevelKey)) to determine an approximate distance, but that measurement will be inaccurate based on honesty, obstacles, and antenna type/orientation. There's some available research on the topic (such as http://www.ccs-labs.org/bib/awad2007adaptive/awad2007adaptive.pdf ), but I haven't come across anything yet that rigorously investigates determining distance based on RSSI and Tx power. I suspect that with enough data and some imagination, it shouldn't be too hard to build a model that scales RSSI distance calculations appropriately based on Tx power.
Much appreciated, Scott.
May I ask you what kind of normalization is done between the strength of the received signal and the transmit power in the advertisement packet (of the peripheral) ?
Feel free to share the formula, or the concept as you may know or suppose it is.
Thanks !
Alex
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