bluetoothIdealReceiver

Decode Bluetooth BR/EDR PHY waveform

Since R2020a

Syntax

[bits,decodedInfo] = bluetoothIdealReceiver(waveform,rxConfig)

[___,pktValidStatus,decodedCRC] = bluetoothIdealReceiver(___)

Description

[bits,decodedInfo] = bluetoothIdealReceiver(waveform,rxConfig) demodulates and decodes a synchronized time-domain Bluetooth^® basic rate/enhanced data rate (BR/EDR) waveform, waveform, generated by the bluetoothWaveformGenerator function for a given system configuration object, rxConfig. The function returns the decoded payload bits, bits, and decoded information, decodedInfo.

[___,pktValidStatus,decodedCRC] = bluetoothIdealReceiver(___) returns a flag, pktValidStatus, to indicate the validity of the received Bluetooth BR/EDR packet. The function also returns the decoded cyclic redundancy check (CRC), decodedCRC, of the received Bluetooth BR/EDR packet.

Examples

Demodulate and Decode Time-Domain Bluetooth BR/EDR Waveform

Demodulate and decode time-domain Bluetooth BR/EDR waveform by using the bluetoothPhyConfig object or bluetoothWaveformConfig object to extract the PHY information.

Use the bluetoothPhyConfig object to get PHY information

Create a default Bluetooth BR/EDR waveform configuration object.

txconfig = bluetoothWaveformConfig;

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

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

Create a default configuration object for the Bluetooth BR/EDR PHY with default settings. This object sends the PHY information to the Bluetooth ideal receiver.

rxConfig = bluetoothPhyConfig;

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,rxConfig)

bits = 144×1

     1
     1
     0
     1
     1
     0
     0
     1
     1
     1
      ⋮

decodedInfo = struct with fields:
                        LAP: [24x1 double]
                 PacketType: 'FHS'
    LogicalTransportAddress: [3x1 double]
          HeaderControlBits: [3x1 double]
              PayloadLength: 18
                       LLID: [2x1 double]
              FlowIndicator: 0

Use the bluetoothWaveformConfig object to get PHY information

Create a default Bluetooth BR/EDR waveform configuration object. Set the packet type to 'DM1'and payload length to 10.

cfg = bluetoothWaveformConfig;
cfg.PacketType = 'DM1';
cfg.PayloadLength = 10;

Create a random input bit vector to generate the payload.

numBits = getPayloadLength(cfg)*8;
dataBits = randi([0 1],numBits,1);

Generate the time-domain Bluetooth BR/EDR waveform by using the payload.

waveform = bluetoothWaveformGenerator(dataBits,cfg);

Get the PHY information from the bluetoothWaveformConfig object function, getPhyConfigProperties.

rxConfig = getPhyConfigProperties(cfg);

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

[bits,decodedInfo,pktStatus,crc] = bluetoothIdealReceiver(waveform,rxConfig)

bits = 80×1

     0
     0
     0
     0
     0
     0
     0
     0
     1
     1
      ⋮

decodedInfo = struct with fields:
                        LAP: [24x1 double]
                 PacketType: 'DM1'
    LogicalTransportAddress: [3x1 double]
          HeaderControlBits: [3x1 double]
              PayloadLength: 10
                       LLID: [2x1 double]
              FlowIndicator: 1

pktStatus = logical
   1

crc = 16×1

     1
     1
     1
     1
     1
     1
     0
     0
     0
     0
      ⋮

Input Arguments

waveform — Synchronized time-domain Bluetooth BR/EDR waveform

complex-valued column vector

Synchronized time-domain Bluetooth BR/EDR waveform, specified as a complex-valued column vector.

Data Types: double
Complex Number Support: Yes

rxConfig — System configuration object

bluetoothPHYConfig object

System configuration object, specified as a bluetoothPhyConfig object.

Output Arguments

bits — Decoded payload bits

binary-valued column vector

Decoded payload bits, returned as a binary-valued column vector.

Data Types: double

decodedInfo — Decoded information

structure

Decoded information, returned as a structure containing these fields:

Field	Value	Description
PacketType	'ID', 'NULL', 'POLL', 'FHS', 'HV1', 'HV2', 'HV3', 'DV', 'EV3', 'EV4', 'EV5', 'AUX1', 'DM3', 'DM1', 'DH1', 'DM5', 'DH3', 'DH5', '2-DH1', '2-DH3', '2-DH5', '2-DH1', '2-DH3', '2-DH5', '2-EV3', '2-EV5', '3-EV3', or '3-EV5'	Type of received Bluetooth BR/EDR packet If the function does not detect any of the Bluetooth BR/EDR packets, this field returns an empty character vector.
LAP	24-bit column vector of type double.	Decoded lower address part (LAP) of the Bluetooth device address
PayloadLength	Scalar of type double	Number of payload bytes in the received Bluetooth BR/EDR packet
LogicalTransportAddress	3-bit vector of type double	Active destination Peripheral for a Bluetooth BR/EDR packet in a Central-to-Peripheral transmission slot
HeaderControlBits	3-bit vector of type double	Link control information containing flow control information (FLOW), acknowledgement for successfully receiving a Bluetooth BR/EDR packet payload (ARQN), and sequencing scheme for received packets (SEQN) bits
LLID	2-bit binary vector of type double	Logical link identifier. This field is applicable only if the value of PacketType field is one of these: 'DM1', 'DH1', 'DM3', 'DH3', 'DM5', 'DH5', 'AUX1', 'DV', '2-DH1', '2-DH3', '2-DH5', '3-DH1', '3-DH3', or '3-DH5'.
FlowIndicator	Scalar of type double	Control data flow indicator over logical channels. This field is applicable only if the value of PacketType field is one of these: 'DM1', 'DH1', 'DM3', 'DH3', 'DM5', 'DH5', 'AUX1', 'DV', '2-DH1', '2-DH3', '2-DH5', '3-DH1', '3-DH3', or '3-DH5'

Data Types: struct

pktValidStatus — Flag indicating validity of received Bluetooth BR/EDR packet

1 or true | 0 or false

Flag indicating validity of received Bluetooth BR/EDR packet, returned as 1 (true) or 0 (false). The validity is based on the Bluetooth BR/EDR packet header error check (HEC) and cyclic redundancy check (CRC). The value of this output is 1 or true only when HEC and CRC are enabled.

Dependencies

To enable this output argument, set the PacketType field value of the decodedInfo output argument to any one of these: 'NULL', 'POLL', 'FHS', 'HV1', 'HV2', 'HV3', 'DV', 'EV3', 'EV4', 'EV5', 'AUX1', 'DM3', 'DM1', 'DH1', 'DM5', 'DH3', 'DH5', '2-DH1', '2-DH3', '2-DH5', '2-DH1', '2-DH3', '2-DH5', '2-EV3', '2-EV5', '3-EV3', or '3-EV5'.

Data Types: logical

decodedCRC — Decoded CRC

16-bit binary-valued column vector

Decoded CRC, specified as the CRC of the received Bluetooth BR/EDR packet.

Dependencies

To enable this output argument, set the PacketType field value of the decodedInfo output argument to any one of these: 'FHS', 'DV', 'EV3', 'EV4', 'EV5', 'DM3', 'DM1', 'DH1', 'DM5', 'DH3', 'DH5', '2-DH1', '2-DH3', '2-DH5', '2-DH1', '2-DH3', '2-DH5', '2-EV3', '2-EV5', '3-EV3', or '3-EV5'.

Data Types: double

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