AN1297: Custom Direction-Finding Solutions using the Silicon Labs Bluetooth Stack

PublishTime：2022-09-07

■Bluetooth 5.1 introduced support for Direction Finding by adding the option to send and receive Constant Tone Extensions (CTEs) after Bluetooth packets. This makes it possible to measure the phase of the incoming signal on different antennas. However, calculating the direction of the incoming signal from the measured phases is the responsibility of the application, and not of the Bluetooth stack. This document explains the interface between the stack and the application regarding phase measurements to enable implementing custom direction-finding solutions using Silicon Labs' Bluetooth stack. The information in this document provides an alternative to using the Silicon Labs customizable reference implementation, and is intended for developers who have a deep understanding of direction-finding algorithms and prefer to develop their own solution.
■KEY POINTS
●Constant Tone Extension
●Antenna Switching
●IQ samples
●Phase compensation

Brand of Product：	Silicon Labs
Part#：
Product Category：	Bluetooth Stack More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2022/9/2
Version Number：	Rev. 0.4
Data Encoding：	AN1297
Data Size：	1.7 MB

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