lrwpanWaveformGenerator
Syntax
Description
wave = lrwpanWaveformGenerator(data,cfg)data, and
physical layer (PHY) format configuration, cfg. For more
information, see IEEE 802.15.4 PPDU Format.
wave = lrwpanWaveformGenerator(data,cfg,Name=Value)lrwpanWaveformGenerator(data,cfg,NumPackets=30)
specifies a waveform containing 30 PPDU packets.
Examples
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 bytesGenerate 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);
Generate random data for a PHY Service Data Unit (PSDU) payload. Create an HPRF IEEE 802.15.4z lrwpanHRPConfig object.
psdu = randi([0,1],8*200,1); cfgHPRF = lrwpanHRPConfig(Mode='HPRF', ... Channel=3, ... % Mandatory low-band channel MeanPRF=124.8, ... % 16 chips per payload symbol STSPacketConfiguration=1, ... % Enable STS before payload NumSTSSegments=2, ... % 2 STS segments CodeIndex=27, ... % One 91-symbols long SYNC code PreambleDuration=32, ... % Repetitions for spread SYNC code SFDNumber=1, ... % Choose a 4-symbol long SFD ConstraintLength=7, ... % Convolutional encoder, no RS coding PSDULength=100); % PSDU length in bytes
Generate an HPRF IEEE 802.15.4z waveform by using the lrwpanWaveformGenerator function and cfgHPRF configuration object. The waveform generator loops PSDU length as needed to use all input PSDU payload bits. Display the waveform by using a spectrumAnalyzer object.
waveHPRF = lrwpanWaveformGenerator(psdu,cfgHPRF); sa = spectrumAnalyzer(SampleRate=cfgHPRF.SampleRate); sa(waveHPRF);
Generate random data for a PHY Service Data Unit (PSDU) payload. Create a BPRF IEEE 802.15.4z lrwpanHRPConfig object. BPRF payload data rate is always at 6.81 Mbps.
psdu = randi([0,1],8*100,1); cfgBPRF = lrwpanHRPConfig(Mode='BPRF', ... STSPacketConfiguration=0, ... % Turn off STS PHRDataRate=6.81, ... % PSDU header data rate in Mbps CodeIndex=9, ... % A 127-symbols long SYNC code PSDULength=length(psdu)/8); % PSDU length in bytes
Generate an BPRF IEEE 802.15.4z waveform by using the lrwpanWaveformGenerator function and cfgBPRF configuration object. The waveform generator loops PSDU length as needed to use all input PSDU payload bits. Display the waveform by using a spectrumAnalyzer object.
waveBPRF = lrwpanWaveformGenerator(psdu,cfgBPRF); sa = spectrumAnalyzer(SampleRate=cfgBPRF.SampleRate); sa(waveBPRF);
Generate random data for a PHY Service Data Unit (PSDU) payload. Create an IEEE 802.15.4a lrwpanHRPConfig object.
psdu = randi([0,1],50,1); cfg4a = lrwpanHRPConfig(Mode='802.15.4a', ... Channel=9, ... % High-band mandatory chan for code index 3 MeanPRF=15.6, ... % 8 candidate bursts DataRate=27.24, ... % 1 chip per burst (PHR at 850 kbps max) CodeIndex=3, ... % 3rd code with length 31 PreambleMeanPRF=4.03, ... % PreambleSpreadingFactor = 64 PSDULength=100); % PSDU length in bytes
Generate an 4a IEEE 802.15.4z waveform by using the lrwpanWaveformGenerator function and cfg4a configuration object. The waveform generator loops input PSDU payload bits as needed to fill PSDU length. Display the waveform by using a spectrumAnalyzer object.
wave4a = lrwpanWaveformGenerator(psdu,cfg4a); sa = spectrumAnalyzer(SampleRate=cfg4a.SampleRate); sa(wave4a);
Generate random data for a PHY Service Data Unit (PSDU) payload. Create a BPRF IEEE 802.15.4z lrwpanHRPConfig object. BPRF payload data rate is always at 6.81 Mbps.
psdu = randi([0,1],8*100,1); cfgBPRF = lrwpanHRPConfig(Mode='BPRF', ... STSPacketConfiguration=0, ... % Turn off STS PHRDataRate=6.81, ... % PSDU header data rate in Mbps CodeIndex=9, ... % A 127-symbols long SYNC code PSDULength=length(psdu)/8); % PSDU length in bytes
Generate a multiframe BPRF IEEE 802.15.4z waveform by using the lrwpanWaveformGenerator function and cfgBPRF configuration object. The waveform generator loops PSDU length as needed to use all input PSDU payload bits. Display the waveform by using a timescope object.
waveBPRF = lrwpanWaveformGenerator(psdu,cfgBPRF, ... NumPackets=3, ... IdleTime=1e-4); ts = timescope(SampleRate=cfgBPRF.SampleRate, ... TimeSpanSource="property", ... TimeSpan=length(waveBPRF)/cfgBPRF.SampleRate, ... YLimits=1.1*[min(waveBPRF), max(waveBPRF)]); ts(waveBPRF);
Input Arguments
Name-Value Arguments
Output Arguments
More About
The IEEE standards for low-rate wireless networks, [1] and [2], specify IEEE 802.15.4 PHY protocol data unit (PPDU) formats for transmission of O-QPSK PHY and HRP UWB PHY waveforms. For all formats, the PPDU field structure includes preamble and payload portions. This figure shows the PPDU headers and payloads as defined in Figure 5-7 of [1].
The
lrwpanHRPConfigobject specifies configuration for the HRP UWB PPDU format — The output waveform is a high-rate pulse repetition frequency (HRP) ultra-wide band (UWB) IEEE 802.15.4 a/z waveform. If theModeproperty of the object is:'HPRF'— The output is a higher pulse repetition frequency (HPRF) waveform.'BPRF'— The output is a base pulse repetition frequency (BPRF) waveform.'802.15.4a'— The output is an IEEE 802.15.4a™ waveform.
The
lrwpanOQPSKConfigobject specifies configuration for the O-QPSK PPDU format — The output waveform is a ZigBee® O-QPSK IEEE 802.15.4 waveform.
To produce a continuous input stream, you can have your code loop on a waveform from the last packet back to the first packet.
When looping a waveform, the last symbol of packet_N is followed by the first symbol of packet_1. If the waveform has only one packet, the waveform loops from the last symbol of the packet to the first symbol of the same packet.
Specify the idle time by using the IdleTime input to the lrwpanWaveformGenerator
function.
References
[1] IEEE STD 802.15.4-2020. "IEEE Standard for Low-Rate Wireless Networks." May 2020.
[2] IEEE STD 802.15.4z-2020. "IEEE Standard for Low-Rate Wireless Networks." Amendment 1: Enhanced Ultra Wideband (UWB) Physical Layers (PHYs) and Associated Ranging Techniques. June 2020.
