bluetoothPhyConfig

Bluetooth BR/EDR PHY configuration parameters

Since R2020a

Description

The bluetoothPhyConfig object sets properties to configure the Bluetooth^® physical layer (PHY).

Creation

Syntax

cfgPHY = bluetoothPhyConfig

cfgPHY = bluetoothPhyConfig(Name,Value)

Description

cfgPHY = bluetoothPhyConfig creates a default Bluetooth PHY configuration object, cfg.

cfgPHY = bluetoothPhyConfig(Name,Value) sets properties by using one or more name-value pairs. Enclose each property name in quotes. For example, ('Mode','EDR3M') sets the PHY transmission mode to 3 Mbps.

Properties

Note

For more information about Bluetooth BR/EDR waveform generator properties and their respective values, see Volume 2, Part B, Sections 6 and 7 of the Bluetooth Core Specification [2].

Mode — PHY transmission mode

'BR' (default) | 'EDR2M' | 'EDR3M'

PHY transmission mode, specified as 'BR', 'EDR2M', or 'EDR3M'. This value indicates the type of Bluetooth BR/EDR waveform.

Data Types: char | string

DeviceAddress — Bluetooth BR/EDR device address

'0123456789AB' (default) | 12-element character vector | string scalar denoting 6-octet hexadecimal value

Bluetooth BR/EDR device address, specified as a 12-element character vector or a string scalar denoting a 6-octet hexadecimal value.

Data Types: char | string

ModulationIndex — Modulation Index

0.32 (default) | scalar in the range [0.28, 0.35]

Modulation index, specified as a scalar in the range [0.28, 0.35]. This property is the modulation index that the object uses when performing Gaussian frequency shift keying (GFSK) modulation or demodulation.

Data Types: double

SamplesPerSymbol — Samples per symbol

8 (default) | positive integer

Samples per symbol, specified as a positive integer. The object uses this value for GFSK modulation and demodulation.

Data Types: double

WhitenStatus — Data whiten status

'On' (default) | 'Off'

Data whiten status, specified as 'On' or 'Off'. To perform whitening on header and payload bits, set this value to 'On'.

Data Types: char | string

WhitenInitialization — Whiten initialization

[1; 1; 1; 1; 1; 1; 1] (default) | 7-bit binary column vector

Whiten initialization, specified as a 7-bit binary column vector.

Dependencies

To enable this property, set the WhitenStatus property to 'On'.

Data Types: double

HasExtendedSCO — Flag to indicate presence of eSCO link

0 or false (default) | 1 or true

Flag to indicate the presence of an extended synchronous connection-oriented (eSCO) link, specified as a logical 0 (false) or 1 (true). A value of 1 or true indicates that the eSCO link is present.

Data Types: logical

ExtendedSCOPayloadLength — Payload length of eSCO packet

18 (default) | integer in range [1, X]

Payload length of the eSCO packet, specified as an integer in the range [1, X], where X depends on the type of the specified eSCO packet. For more information about eSCO packets and the supported payload lengths, see Packet Types. To specify the eSCO packet type, configure the PacketType property of the bluetoothWaveformConfig object. Specify the number of bytes to be processed in an eSCO packet by configuring this property.

Dependencies

To enable this property, set the HasExtendedSCO property to 1 or true.

Data Types: double

IsIDPacket — Flag to indicate reception of ID packet

0 or false (default) | 1 or true

Flag to indicate the reception of the ID packet, specified as a logical 0 (false) or 1 (true). A value of 1 or true indicates that the ID packet is received.

Data Types: logical

Examples

Create Bluetooth BR/EDR PHY Configuration Objects

Create two unique Bluetooth BR/EDR PHY configuration objects: one for synchronous connection oriented (SCO) logical transport and the other for connectionless peripheral broadcast (CPB) logical transport.

Create a default Bluetooth BR/EDR PHY configuration object for an SCO logical transport.

cfgPHY = bluetoothPhyConfig

cfgPHY = 
  bluetoothPhyConfig with properties:

                    Mode: 'BR'
           DeviceAddress: '0123456789AB'
         ModulationIndex: 0.3200
        SamplesPerSymbol: 8
            WhitenStatus: 'On'
    WhitenInitialization: [7x1 double]
          HasExtendedSCO: 0
              IsIDPacket: 0

Create another Bluetooth BR/EDR PHY configuration object for a CSB logical transport by disabling the whiten status.

cfgPHY = bluetoothPhyConfig('WhitenStatus','Off')

cfgPHY = 
  bluetoothPhyConfig with properties:

                Mode: 'BR'
       DeviceAddress: '0123456789AB'
     ModulationIndex: 0.3200
    SamplesPerSymbol: 8
        WhitenStatus: 'Off'
      HasExtendedSCO: 0
          IsIDPacket: 0

Generate and Decode Bluetooth BR/EDR PHY Waveform with eSCO Packets

Create a Bluetooth BR/EDR waveform configuration object, specifying the packet type as 'EV5'. The 'EV5' packet supports eSCO logical transport. For more information about Bluetooth BR/EDR packets and the corresponding payload lengths supported on the eSCO logical transport, see Bluetooth BR/EDR Packet Structure.

cfgWaveform = bluetoothWaveformConfig('PacketType','EV5')

cfgWaveform = 
  bluetoothWaveformConfig with properties:

                       Mode: 'BR'
                 PacketType: 'EV5'
              PayloadLength: 18
              DeviceAddress: '0123456789AB'
    LogicalTransportAddress: [3x1 double]
          HeaderControlBits: [3x1 double]
            ModulationIndex: 0.3200
           SamplesPerSymbol: 8
               WhitenStatus: 'On'
       WhitenInitialization: [7x1 double]

Create a random input bit vector to generate the payload. Generate a time-domain Bluetooth BR/EDR waveform by using the payload and the specified waveform configuration.

dataBits = randi([0 1],getPayloadLength(cfgWaveform)*8,1);
waveform = bluetoothWaveformGenerator(dataBits,cfgWaveform);

Create a Bluetooth BR/EDR PHY configuration object, specifying the presence of eSCO link and the ID packet. This object sends the PHY information to the Bluetooth ideal receiver.

cfgPHY = bluetoothPhyConfig('HasExtendedSCO',1,'IsIDPacket',1)

cfgPHY = 
  bluetoothPhyConfig with properties:

                        Mode: 'BR'
               DeviceAddress: '0123456789AB'
             ModulationIndex: 0.3200
            SamplesPerSymbol: 8
                WhitenStatus: 'On'
        WhitenInitialization: [7x1 double]
    ExtendedSCOPayloadLength: 18

Demodulate and decode the Bluetooth BR/EDR waveform. The generated output displays the decoded bits and a structure containing the decoded information.

[bits,decodedInfo] = bluetoothIdealReceiver(waveform,cfgPHY);

References

[1] Bluetooth Technology Website. “Bluetooth Technology Website | The Official Website of Bluetooth Technology.” Accessed November 22, 2021. https://www.bluetooth.com/.

[2] Bluetooth Special Interest Group (SIG). "Bluetooth Core Specification." Version 5.3. https://www.bluetooth.com/.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

Properties must be specified as coder.Constant().

Version History

Introduced in R2020a

R2023a: Includes support for configuring payload length of eSCO packets

The bluetoothPhyConfig object now supports configuring the payload length of eSCO logical transport packets through the new, HasExtendedSCO and ExtendedSCOPayloadLength properties. You can also detect the presence of the ID packet at the receiver by configuring the new IsIDPacket property.