phased.LOSChannel
Narrowband LOS propagation channel
Description
Thephased.LOSChannel
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 usephased.LOSChannel
to model the propagation of signals between multiple points simultaneously.
While the System object™ works for all frequencies, 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.
Thephased.LOSChannel
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 thephased.FreeSpace
System object, thephased.LOSChannel
System object supports two-way propagation.
To compute the propagation delay for specified source and receiver points:
Define and set up your LOS channel using theConstruction过程。你可以设置propertie的系统对象s during construction or leave them at their default values. Some properties are tunable and can be changed at any time.
Call the
step
method to compute the propagated signal using the properties of thephased.LOSChannel
System object.
Note
Starting in R2016b, instead of using thestep
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)
andy = obj(x)
perform equivalent operations.
Construction
sLOS = phased.LOSChannel
creates an LOS attenuating propagation channel System object,sLOS
.
sLOS = phased.LOSChannel(
creates a System object,Name
,Value
)sLOS
, with each specified propertyName
set to the specifiedValue
. You can specify additional name and value pair arguments in any order as (Name1,Value1
,...,NameN,ValueN
).
Properties
Methods
reset | Reset states ofSystem object |
step | Propagate signal in 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]国际无线电通信部门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.