phased.WidebandLOSChannel
Wideband LOS propagation channel
Description
The phased.WidebandLOSChannel
models the propagation
of narrowband electromagnetic signals through a line-of-sight (LOS) channel from a
source to a destination. In an LOS channel, propagation paths are straight lines from
point to point. The propagation model in the LOS channel includes free-space attenuation
in addition to attenuation due to atmospheric gases, rain, fog, and clouds. You can use
phased.WidebandLOSChannel
to model the propagation
of signals between multiple points simultaneously. The System object™ works for all frequencies.
While the attenuation models for atmospheric gases and rain are valid for electromagnetic signals in the frequency range 1–1000 GHz only, the attenuation model for fog and clouds is valid for 10–1000 GHz. Outside these frequency ranges, the System object uses the nearest valid value.
The phased.WidebandLOSChannel
System object applies range-dependent time delays to the signals, as well as gains or
losses. When either the source or destination is moving, the System object applies Doppler shifts.
Like the phased.WidebandFreeSpace
System object, the phased.WidebandLOSChannel
System object supports two-way propagation.
To compute the propagation delay for specified source and receiver points:
Define and set up your Wideband LOS channel using the Construction procedure. You can set the System object properties during construction or leave them at their default values.
Call the
step
method to compute the propagated signal using the properties of thephased.WidebandLOSChannel
System object. You can change tunable properties before or after any call to thestep
method.
Note
Starting in R2016b, instead of using the step
method to perform the operation defined by the System object, you can call the object with arguments, as if it were a function. For
example, y = step(obj,x)
and y = obj(x)
perform equivalent operations.
Construction
sWBLOS = phased.WidebandLOSChannel
creates a Wideband LOS
attenuating propagation channel System object, sWBLOS
.
sWBLOS = phased.WidebandLOSChannel(
creates a System object, Name
,Value
)sWBLOS
, with each specified property
Name
set to the specified Value
. You can
specify additional name and value pair arguments in any order as
(Name1,Value1
,...,NameN,ValueN
).
Properties
Methods
reset | Reset states of System object |
step | Propagate signal in Wideband LOS channel |
Common to All System Objects | |
---|---|
release | Allow System object property value changes |
Examples
More About
References
[1] Radiocommunication Sector of the International Telecommunication Union. Recommendation ITU-R P.676-10: Attenuation by atmospheric gases. 2013.
[2] Radiocommunication Sector of the International Telecommunication Union. Recommendation ITU-R P.840-6: Attenuation due to clouds and fog. 2013.
[3] Radiocommunication Sector of the International Telecommunication Union. Recommendation ITU-R P.838-3: Specific attenuation model for rain for use in prediction methods. 2005.
[4] Seybold, J. Introduction to RF Propagation. New York: Wiley & Sons, 2005.
[5] Skolnik, M. Introduction to Radar Systems, 3rd Ed. New York: McGraw-Hill, 2001.
Extended Capabilities
Version History
Introduced in R2016a
See Also
Functions
rangeangle
|fogpl
|gaspl
|rainpl
|fspl
Objects
phased.FreeSpace
|phased.RadarTarget
|phased.BackscatterRadarTarget
|twoRayChannel
(Radar Toolbox) |phased.WidebandFreeSpace
|phased.LOSChannel