Estimate AoA or AoD of BLE Signal
Download Required: To use bleAngleEstimate, first download Communications Toolbox™ Library for the Bluetooth® Protocol. For more information, see Get and Manage Add-Ons. Alternatively, see Communications Toolbox Library for the Bluetooth Protocol File Exchange.
Create a BLE angle estimation configuration object, specifying the values of antenna array size, slot duration, and antenna switching pattern.
cfg = bleAngleEstimateConfig('ArraySize',2,'SlotDuration',2,... 'SwitchingPattern',[1 2])
cfg = bleAngleEstimateConfig with properties: ArraySize: 2 ElementSpacing: 0.5000 SlotDuration: 2 SwitchingPattern: [1 2]
Set the IQ samples such that they define a connection data channel protocol data unit (PDU) with an AoA constant tone extension (CTE) of 2 slots, CTE time of 16 , and azimuth rotation of 70 degrees.
IQsamples = [0.8507+0.5257i;-0.5257 + 0.8507i;-0.8507 - 0.5257i;... 0.5257 - 0.8507i;0.8507+0.5257i;-0.5257 + 0.8507i;... -0.8507 - 0.5257i;0.5257 - 0.8507i;-0.3561 + 0.9345i];
Estimate the AoA of the BLE signal.
angle = bleAngleEstimate(IQsamples,cfg)
angle = 70
IQsamples— IQ samples
IQ samples, specified as a complex-valued column vector. This argument corresponds to the 8 μs value of the reference period and slot duration.
angle— AoA or AoD
AoA or AoD, returned as one of these values.
Real number – This value is the estimated broadside angle. If elevation is 0, the estimated broadside angle represents the azimuth angle.
Two-element row vector of real numbers in the form [azimuth elevation] – azimuth and elevation are the estimated azimuth angle and elevation angle in degrees, respectively.
 Bluetooth Technology Website. “Bluetooth Technology Website | The Official Website of Bluetooth Technology.” Accessed November 22, 2019. https://www.bluetooth.com/.
 Bluetooth Special Interest Group (SIG). "Bluetooth Core Specification." Version 5.1. https://www.bluetooth.com/.
 Wooley, Martin. Bluetooth Direction Finding: A Technical Overview. Bluetooth Special Interest Group (SIG), Accessed April 6, 2020, https://www.bluetooth.com/.