January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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Bluetooth 5 PHY and interference
Bluetooth devices operate in the 2.4000 to 2.4835 GHz industrial, scientific, and medical (ISM) unlicensed frequency band. As mentioned earlier in this chapter, this particular unlicensed area is congested with a number of other wireless media, such as 802.11 Wi-Fi. To alleviate interference, Bluetooth supports frequency-hopping spread spectrum (FHSS).
When having a choice between Bluetooth classic modes of BR/EDR, EDR will have less of a chance of interference and better coexistence with Wi-Fi and other Bluetooth devices since the on-air time is shorter due to its speed.
Adaptive Frequency Hopping (AFH) was introduced in Bluetooth 1.2. AFH uses two types of channels: used and unused. Used channels are in-play ...
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