Reduce amplitude of input signal by amount specified
RF Impairments
The Free Space Path Loss block simulates the loss of signal power due to the distance between transmitter and receiver. The block reduces the amplitude of the input signal by an amount that is determined in either of two ways:
By the Distance (km) and Carrier frequency
(MHz) parameters, if you specify Distance and
Frequency
in the Mode field
By the Loss (dB) parameter, if you specify
Decibels
in the Mode
field
This block accepts a column vector input signal. The input signal to this block must be a complex signal.
Method of specifying the amount by which the signal power is reduced. The
choices are Decibels
and Distance
and Frequency
.
The signal loss in decibels. This parameter appears when you set
Mode to Decibels
. The
decibel amount shown on the mask is rounded for display purposes
only.
Distance between transmitter and receiver in kilometers. This parameter
appears when you set Mode to Distance and
Frequency
.
The carrier frequency in megahertz. This parameter appears when you set
Mode to Distance and
Frequency
.
The model below illustrates the effect of the Free Space Path Loss block with the following parameter settings:
Mode is set to Distance and
Frequency
.
Distance (km) is set to 0.5
Carrier frequency (MHz) is set to
180