info
Characteristic information about WPAN high-rate pulse configuration object
Since R2023a
Syntax
Description
returns a structure containing information about the characteristics of the WPAN
high-rate pulse (HRP) configured by the input infostruct
= info(cfg
)lrwpanHRPConfig
object.
Examples
Return Configuration Information for lrwpanHRPConfig object
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
Return information about the characteristics of the high-rate pulse configured by the lrwpanHRPConfig
object.
info(cfgHPRF)
ans = struct with fields:
PeakPRF: 249.6000
ChipsPerSymbol: 16
ConvolutionalCoding: 1
PreambleCodeLength: 91
PreambleSpreadingFactor: 4
Input Arguments
cfg
— Configuration object to get information from
lrwpanHRPConfig
object
Configuration object to get information from, specified as an lrwpanHRPConfig
object.
Output Arguments
infostruct
— Structure containing object information
structure
Structure containing these fields with information about the configuration object.
PeakPRF
— Peak pulse repetition frequency
positive scalar
Peak pulse repetition frequency in MHz, returned as a positive scalar.
When
Mode
is'HPRF'
andMeanPRF
is 124.8 MHz, the chip (or pulse) spacing is 1 / (249.6 MHz) = 4 ns apart.For other
Mode
andMeanPRF
setting combinations, the chip (or pulse) spacing is 1/(499.2 MHz) = 2 ns apart.
BurstsPerSymbol
— Number of burst durations per symbol
positive scalar
Number of burst durations per symbol, returned as a positive scalar.
The number of burst durations within a symbol consists of
candidate active bursts and the guard intervals. It equals the
symbol duration divided by the (ChipsPerBurst
× ChipDuration
) and
ChipDuration
is 0.2 ns. The value of
BurstsPerSymbol
is
128
, 32
, or
8
for MeanPRF
values
of 3.9
, 15.6
, or
62.4
, respectively.
Dependencies
This field is present when Mode
is
'BPRF'
or
'802.15.4a'
.
NumHopBursts
— Number of candidate bursts per symbol
positive integer
Number of candidate bursts per symbol, returned as a positive
integer that is computed as BurstsPerSymbol
/ 4. This property indicates the
number of candidate burst durations within a symbol where
transmissions may occur. The value excludes guard intervals and
bursts that are excluded based on the value of the systematic
bit.
Dependencies
This field is present when Mode
is
'BPRF'
or
'802.15.4a'
.
ChipsPerBurst
— Number of chips per burst
scalar | two-element vector
Number of chips per burst, returned as a scalar or two-element
vector containing values from the set [1
,
2
, 4
,
8
, 16
,
32
, 64
,
128
, or 512
].
When the data rate is 110 or 850 kbps, the
ChipsPerBurst
value is a scalar.For other data rates, the
ChipsPerBurst
value is a two-element vector. The first element is the chips per burst for the PHR and the second element is the chips per burst for the payload.
The selected values depend on the
MeanPRF
and DataRate
combination.
Dependencies
This field is present when Mode
is
'BPRF'
or
'802.15.4a'
.
ChipsPerSymbol
— Number of chips per symbol
scalar | two-element vector
Number of chips per symbol, returned as a scalar or two-element vector.
When
Mode
is'HPRF'
— The number of chips per symbol is either8
,16
, or32
.When
Mode
is'BPRF'
or'802.15.4a'
— The number of chips per symbol equals (ChipsPerBurst
×BurstsPerSymbol
).When the data rate is 110 or 850 kbps, or the constraint length is 7, the
ChipsPerSymbol
value is a scalar.For other data rates or constraint lengths, the
ChipsPerSymbol
value is a two-element vector. The first element is the chips per symbol for the PHR and the second element is the chips per symbol for the payload.
ConvolutionalCoding
— Flag for activation of rate ½ convolutional encoder for payload
0
| 1
Flag for activation of the rate ½ convolutional encoder for
the payload, returned as 0
or
1
. The payload uses convolutional
encoding when ConvolutionalCoding
is
1
.
Convolutional coding is disabled when the mean PRF is
15.6
MHz and the payload data rate is
27.24
Mbps, or when the mean PRF is
3.9
MHz and the data rate is
6.81
Mbps.
The PHR transmission data rate is either 110 or 850 kbps and always applies convolutional encoding.
PreambleCodeLength
— Length of preamble
31
| 91
| 127
Length of the preamble in symbols, returned as a
31
, 91
, or
127
.
PreambleCodeLength
represents the
length of the ternary (-1, 0, 1) code field within the
synchronization header (SHR), and is the length of the code
before spreading and before repetitions.
When CodeIndex
is in the range:
[
0
,8
] —PreambleCodeLength
is31
.[
9
,24
] —PreambleCodeLength
is127
.[
25
,32
] —PreambleCodeLength
is91
.
PreambleSpreadingFactor
— Length of delta function spreading code
4
| 16
| 64
Length of the delta function spreading code in chips, returned
as a 4
, 16
, or
64
.
When
PreambleCodeLength
is91
or127
],PreambleSpreadingFactor
is4
.When
PreambleCodeLength
is31
,If
PreambleMeanPRF
is16.1
MHz,PreambleSpreadingFactor
is16
.If
PreambleMeanPRF
is4.03
MHz,PreambleSpreadingFactor
is64
.
For other configurations,
PreambleCodeLength
is91
.
References
[1] 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.
[2] IEEE STD 802.15.4-2020, IEEE Standard for Low-Rate Wireless Networks. May 2020.
Version History
Introduced in R2023a
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