info
Syntax
Description
Examples
Pass 802.15.4z HPRF Signal Through Outdoor Multipath UWB Channel
Pass an 802.15.4z™ High Pulse Repetition Frequency (HPRF) signal through an outdoor multipath UWB channel.
Create a UWB waveform from random packet data.
psdu = randi([0, 1],300,1); waveTx = lrwpanWaveformGenerator(psdu,lrwpanHRPConfig);
Create a UWB channel object for an outdoor environment with no line of sight. Display the object configuration.
outdoorUWBChannel = uwbChannel('Outdoor', ... HasLOS=false, ... Visualization='Impulse response')
outdoorUWBChannel = uwbChannel with properties: Delay Profile Environment: 'Outdoor' HasLOS: false SampleRate: 1.9968e+09 MaxDopplerShift: 5 SampleDensity: 64 MinRelativePathPower: 5 NormalizePathGains: true Visualization: 'Impulse response' Propagation ChannelNumber: 0 Distance: 10 Realization RandomStream: 'Global stream'
Pass the LRWPAN waveform through the channel and observe the impulse response.
waveRx = outdoorUWBChannel(waveTx);
After passing a waveform through the channel, display characteristic information about the channel. Observe that the NumClusters
value matches the number of clusters plotted in the impulse response.
info(outdoorUWBChannel)
ans = struct with fields:
EnvironmentParameterization: [1x1 struct]
CenterFrequency: 499200000
Bandwidth: 499200000
NumClusters: 5
ClusterArrivalTimes: [8.2597 16.5497 29.9292 108.0369 125.1609]
ClusterEnergies: [0.9241 0.8538 0.7514 0.3563 0.3026]
PathArrivalTimes: {1x5 cell}
AbsolutePathArrivalTimes: {1x5 cell}
PathAveragePowers: {1x5 cell}
PathPhases: {1x5 cell}
NakagamiMFactors: {1x5 cell}
PathGainRate: 640
FrequencyFilterDelay: 25
ChannelFilterDelay: 0
ChannelFilterCoefficients: [152x312 double]
Input Arguments
obj
— System object to get information from
System object
System object to get information from, specified as a uwbChannel
System object.
Output Arguments
S
— Structure containing object information
structure
Structure containing these fields with information about the System object. Detailed field information in this structure remains blank until the object has been called to process a waveform of input data.
EnvironmentParameterization
— Environment parameters
structure
Environment parameters for the given
obj.Environment
and obj.HasLOS
,
returned as a structure containing these fields:
Field  Description  Comment 

Environment  Environment type.  Specified by

HasLOS  Boolean indicating presence of lineofsight component.  Specified by

ReferencePathLoss  Path loss in dB at 1 m distance.  – 
PathLossExponent  Path loss exponent (γ), which determines the rate at which received power decays as a function of distance.  – 
ShadowingDeviation  Standard deviation (σ_{S}) in dB of a zeromean Gaussian distributed random variable (S), which expresses shadowing for largescale fading.  – 
AntennaLoss  Antenna loss (Α_{ant}) in dB.  – 
FrequencyExponent  Frequency dependence of path loss (κ) in dB/octave that determines the rate at which received power decays as a function of frequency.  – 
AverageNumClusters  Mean number of clusters (Lbar) in which rays are grouped.  – 
ClusterArrivalRate  Intercluster arrival rate (Λ) of clusters of groups of rays, which follow a Poisson process. The value expresses the number of arrivals with 1 ns.  This property does not apply when you set

PathArrivalRate1  First (ray) arrival rate for mixed Poisson model,
returned as one of the two arrival rates of rays within a
cluster (λ_{1}), which follow a
Poisson process. PathArrivalRate1 is
weighted by MixtureProbability . The
value expresses the number of arrivals with 1 ns.  These properties do not apply when
you set These
properties are not applied when you set

PathArrivalRate2  Second (ray) arrival rate for mixed Poisson model,
returned as the other arrival rate of rays within a
cluster (λ_{2}), which follow a
Poisson process. PathArrivalRate2 is
weighted by the complement of the mixture probability, (1 –
MixtureProbability ). The value expresses the number of
arrivals with 1 ns.  
MixtureProbability  Mixture probability for mixed Poisson model, returned
as a mixture probability (β) that specifies the relative
weight of the two different ray arrival rates within a
cluster (PathArrivalRate1 and
PathArrivalRate2 ). Values
must be in the range [0, 1].  
ClusterEnergyDecayConstant  Intercluster exponential decay constant in ns, returned as a constant (Γ) determining the rate of exponential decay of the cluster integrated energy as a function of the cluster arrival time.  This property does not apply when you set
obj.HasLOS to
false and
obj.Environment to either
'Indoor office' or
'Industrial' . 
PathDecaySlope  Slope of intracluster exponential decay constant (κ_{γ}) proportionally affects γ_{1} as a function of the cluster arrival time. γ_{1} is a constant determining the rate of exponential decay of the power of a ray as a function of the ray arrival time.  This property does not apply when you set
obj.HasLOS to
false and
obj.Environment to either
'Indoor office' or
'Industrial' . 
PathDecayOffset  Offset of intracluster exponential decay constant, returned as the yintercept value (γ_{0}) in ns of the function relating γ_{1} with the cluster arrival time. γ_{1} is a constant determining the rate of exponential decay of the power of a ray as a function of the ray arrival time.  This property does not apply when you set
obj.HasLOS to
false and
obj.Environment to either
'Indoor office' or
'Industrial' . 
ClusterShadowingDeviation  Standard deviation of cluster shadowing (σ_{cluster}) in dB of a normally distributed random variable (Μ_{cluster}), which expresses cluster shadowing as temporal variations from the average cluster power.  This property applies when you set

PDPIncreaseFactor  Increase rate of alternative power delay profile (PDP) rise (γ_{rise}) determines how quickly the alternative PDP rises.  These properties do not apply when
you set 
PDPDecayFactor  Decay rate of alternative PDP at later times (γ_{1}) determines how quickly the alternative PDP decays.  
FirstPathAttenuation  Attenuation of 1st component in alternative PDP, returned as the attenuation (χ) of the first multipath component in the alternative PDP.  
NakagamiMeanOffset  Offset of Nakagami mfactor mean, returned as the yintercept value (m_{0}) in dB of the function relating the mean value of the Nakagami mfactor with the delay of a multipath component.  
NakagamiMeanSlope  Slope of Nakagami μ factor mean, returned as the slope (k_{m}) of the function relating the mean value of the Nakagami μ factor with the delay of a multipath component.  
NakagamiDeviationOffset  Offset of Nakagami mfactor variance, returned as the yintercept value (m_{0}) in dB of the function relating the standard deviation of the Nakagami mfactor with the delay of a multipath component.  
NakagamiDeviationSlope  Slope of Nakagami mfactor variance  
FirstPathNakagamiMFactor  Nakagami mfactor of first (strong) component 
Data Types: struct
CenterFrequency
— Center frequency
positive scalar
Center frequency in hertz, returned as a positive scalar.
Bandwidth
— Bandwidth
positive scalar
Bandwidth in hertz, returned as a positive scalar.
NumClusters
— Number of clusters
positive integer
Number of clusters in the channel realization, returned as a positive integer.
ClusterArrivalTimes
— Cluster arrival times
column vector
Cluster arrival times in the channel realization in seconds, returned
as a 1byNumClusters
vector of positive values.
ClusterEnergies
— Cluster energies
column vector
Cluster energies in the channel realization in watts, returned as a
1byNumClusters
vector of positive values.
PathArrivalTimes
— Path arrival times
cell array
Path arrival times in the channel realization in seconds, returned as
a 1byNumClusters
cell array. Each element in the cell array is
a 1byK_{l} vector, where
K_{l} is the number of paths
for the lth cluster.
AbsolutePathArrivalTimes
— Absolute path arrival times
cell array
Absolute path arrival times in the channel realization in seconds,
returned as a 1byNumClusters
cell array. Each element in the cell array is
a 1byK_{l} vector, where
K_{l} is the number of paths
for the lth cluster.
PathAveragePowers
— Average power of s paths
cell array
Average power of paths in the channel realization in dB, returned as a
1byNumClusters
cell array. Each element in the cell array is
a 1byK_{l} vector, where
K_{l} is the number of paths
for the lth cluster.
PathPhases
— Path phases
cell array
Path phases in the channel realization in radians, returned as a
1byNumClusters
cell array. Each element in the cell array is
a 1byK_{l} vector, where
K_{l} is the number of paths
for the lth cluster.
NakagamiMFactors
— Nakagami M factors
cell array
Nakagami M factors in the channel realization, returned as a
1byNumClusters
cell array. Each element in the cell array is
a 1byK_{l} vector, where
K_{l} is the number of paths
for the lth cluster.
PathGainRate
— Path gain rate
positive scalar
Path gain rate, returned as a positive scalar. The path gain rate
equals 2×obj.MaxDopplerShift
×obj.SampleDensity
.
FrequencyFilterDelay
— Frequency filter delay
positive integer
Frequency filter delay in samples, returned as a positive integer.
ChannelFilterDelay
— Excess channel filter delay
positive integer
Excess channel filter delay in samples, returned as a positive integer.
ChannelFilterCoefficients
— Channel filter coefficients
matrix
Channel filter coefficients, returned as a matrix. The time varying path gains are applied as gains to this nonvarying filter to produce the channel output over time
References
[1] A. F. Molisch et al., "IEEE^{®} 802.15.4a Channel ModelFinal Report." Tech. Rep., Document IEEE 802.1504006202004a, 2005.
Version History
Introduced in R2024a
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