lrwpanOQPSKConfig

Configure O-QPSK IEEE 802.15.4 transmission

Since R2023a

Download Required: To use lrwpanOQPSKConfig, first download the Communications Toolbox Library for ZigBee and UWB add-on.

Description

The lrwpanOQPSKConfig object is a configuration object for the WPAN O-QPSK physical layer (PHY) format of IEEE^® 802.15.4. Higher layer standards, such as ZigBee^®, use this PHY. For a detailed description of the waveform format, see [1].

Creation

Syntax

cfgHRP = lrwpanOQPSKConfig

cfgHRP = lrwpanOQPSKConfig(Name=Value)

Description

cfgHRP = lrwpanOQPSKConfig creates a configuration object that initializes transmit parameters for an O-QPSK IEEE 802.15.4 ZigBee waveform.

cfgHRP = lrwpanOQPSKConfig(Name=Value) sets properties using one or more name-value arguments. For example, lrwpanOQPSKConfig(PSDULength=64) specifies a PSDU length of 64 bytes.

Properties

Band — Center frequency of operating range

2450 (default) | 780 | 868 | 915 | 2380

Center frequency of operating range in MHz, specified as 780, 868, 915, 2380, or 2450. The configuration object uses this property when determining the spreading factor and filtering type.

Data Types: double | single

SamplesPerChip — Number of samples per chip pulse

4 (default) | even positive integer

Number of samples per chip pulse, specified as an even positive integer. The configuration object uses this property when determining the number of samples used to construct a filtered O-QPSK chip.

Data Types: double | single

PSDULength — Length of PSDU

127 (default) | positive integer in the range [0, 127]

Length of the PHY service data unit (PSDU) in bytes, specified as a positive integer in the range [0, 127].

Data Types: double | single

SampleRate — Sample rate of output waveform

4e6 (default) | positive scalar

Sample rate of the output waveform in Hz, specified as a positive scalar.

Data Types: double | single

Examples

Create OQPSK IEEE 802.15.4 Waveform

Generate random data for a PHY Service Data Unit (PSDU) payload. Create an OQPSK IEEE 802.15.4 lrwpanOQPSKConfig object. Create an OQPSK IEEE 802.15.4 waveform.

       psdu = randi([0,1],127*8,1);
       spc = 8;
       cfgOQPSK = lrwpanOQPSKConfig( ...
           SamplesPerChip=spc, ...
           PSDULength=length(psdu)/8); % PSDU length in bytes

Generate an OQPSK IEEE 802.15.4 waveform by using the lrwpanWaveformGenerator function and cfgOQPSK configuration object. The waveform generator loops PSDU length as needed to use all input PSDU payload bits. Display the waveform by using the eyediagram function.

       waveOQPSK = lrwpanWaveformGenerator(psdu,cfgOQPSK);
       eyediagram(waveOQPSK(1+spc:end-spc), 2*spc);

References

[1] IEEE STD 802.15.4-2020, IEEE Standard for Low-Rate Wireless Networks. May 2020.

Extended Capabilities

C/C++ Code Generation

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

This function supports C/C++ code generation with the limitations:

• See System Objects in MATLAB Code Generation (MATLAB Coder).

Version History

Introduced in R2023a