R&S SGT100A, Руководство пользователя

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Signal Generator Settings
R&S
®
SGT100A
129 User Manual 1176.8674.02 ─ 07
"C/N or S/N"= ("E
b
/N
0
")*(f
bit
/B
sys
) , where:
●
"C/N or S/N" is the carrier/noise ratio
●
"E
b
/N
0
" is the ratio of bit energy to noise power density.
●
"Bit Rate "f
bit
= "Symbol Rate" x Modulation Value
●
B
sys
is the system bandwidth.
Remote command:
[:SOURce<hw>]:AWGN:POWer:MODE
on page 347
Reference Mode
Selects whether the carrier or the noise power is kept constant if the C/N or Eb/N0 ratio
is changed.
Remote command:
[:SOURce<hw>]:AWGN:POWer:RMODe
on page 348
Bit Rate
Available only for "Mode > Additive Noise".
Indicates the bit rate used for converting C/N or S/N to E
b
/N
0
.
Remote command:
[:SOURce<hw>]:AWGN:BRATe
on page 342
Carrier/Noise Ratio / Signal/Noise Ratio
Available only for "Mode > Additive Noise" and "Mode > CW Interferer".
Sets the carrier/noise, signal/noise or respectively signal/interferer ratio.
Whether a configuration of C/N or S/N is enabled, depends on the selected output Dis-
play Mode .
●
For "Reference Mode > Carrier ", this entry determines the power of the output sig-
nal , i.e. the c noise signal. It does not affect the power of the useful signal,
i.e. the carrier power remains constant.
●
For "Reference Mode > Noise ", this entry determines the power of the useful sig-
nal , i.e. the carrier power. The power of the output signal remains constant.
●
The power of the noise signal is derived from the entered C/N or S/N value and
displayed with the parameter "Noise Power" in the units of the useful signal.
●
The power of the useful signal is displayed with the parameter Carrier Power / Sig-
nal Power and can also be changed there. This indication corresponds to the
"Level" value in the "Status bar".
●
The power of the output signal is displayed under C Noise Power /
Noise Power (System Bandwidth) / C Interferer Power / Interferer
Power
.
Remote command:
[:SOURce<hw>]:AWGN:CNRatio
on page 344
E
b
/N
0
Available only for "Mode > Additive Noise".
Sets the ratio of bit energy to noise power density.
Additive White Gaussian Noise (AWGN) - Noise Generator