Adaptive frequency hopping with Bluetooth LE audio broadcast

[MKir]

We are evaluating the nRF5340 chip for a Bluetooth LE audio broadcast streaming application.

Is it possible to use adaptive frequency hopping with the BLE audio network core image? If yes, how to do it with the audio sample?

[SwRa]

Hi Miklos,

I believe it is not possible to use Adoptive Frequency Hopping with LE audio application since BLE is not FHSS.. I will however, confirm this and get back to you.

Regards,

Swathy

[MKir]

Thank you Swathy.

I got this idea from "The Bluetooth Low Energy Primer" [1]. It states in chapter 7.4 Channel selection:

"One well known example of a spread spectrum technique used in Bluetooth LE is that of adaptive frequency hopping. This involves the radio channel used for packet communication changing at regular intervals. Channels are chosen using a channel selection algorithm and a table of data called the channel map which classifies each channel as either used or unused. Implementations can monitor the quality of communication on each channel and if a channel is found to be performing badly, perhaps due to interference from other sources, the channel map can be updated to set that channel’s classification to unused and this ensures that this channel is no longer selected by the algorithm. In this way, channel selection algorithm adapts to the conditions being experienced and optimizes for the most reliable performance."

Of course, BLE audio broadcasts don't have a feedback channel about reception quality at e.g. a headphone.

[1] Bluetooth_LE_Primer_Paper.pdf

[Mathieu Chante]

Hello,

When BLE is set to broadcast (no return path), how does frequency hopping work ?

Mathieu