Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
434User Manual 1175.6632.02 ─ 30
About the single sideband shape profiles
Phase noise profiles describe the single-sided band frequency response of the phase
noise. When a file is loaded, the amplitude at 100Hz is held to the previously set value;
all other amplitudes are calculated according to the profile. To change the amplitude of
the complete profile, set the amplitude at f = 100Hz.
Phase noise profile files are files with predefined extension (*.fcf) and defined file
content.
The file content is as follows:
●
Any number of comment lines, each starting with the symbol %
●
The keyword SOS matrix:
●
Two lines, each with the following six coefficients:
b
0
b
1
b
2
a
0
a
1
a
2
Where:
– Coefficients are separated by spaces
– Each line corresponds to a second-order section (filter element with two zeros
and two poles)
As a result, you obtain the following filter function for each line:
The two lines in turn form a cascade connection, which corresponds to multiplying the
two functions. The total characteristic of the SSB noise is hence calculated as follows:
SSB(f)
lin
= N
0
|H
1
(z)*H
2
(z)|
Where:
●
N
0
= -68.3 dBc/Hz
●
z = e
-j 2π f/10 MHz
= cos(2π*f/10 MHz) – j*sin(2π*f/10 MHz)
Predefined SSB profiles
The following predefined SSB profiles are provided:
●
ATSC_A74.fcf
●
crystal1.fcf
●
crystal2.fcf
●
crystal3.fcf
●
crystal4.fcf
●
crystal5.fcf
●
DVB-S2 A1.fcf
●
DVB-S2 A2.fcf
●
DVB-S2 D1.fcf
●
DVB-S2 P1.fcf
●
DVB-S2 P2.fcf
Generating Impulsive and Phase Noise
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