Rohde & Schwarz R&S SMW200A - Page 444

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
444User Manual 1175.6632.02 ─ 30
The remote commands required to define these settings are described in:
●
Chapter 14.19.4.6, "SOURce:BB:IMPairment Subsystem", on page 1098.
●
Chapter 14.19.9, "SOURce:IQ Subsystem", on page 1136.
The instrument can also simulate the effect of non-linear effects like AM/AM and
AM/PM conversion.
See user manual R&S
®
SMW-K540, R&S
®
SMW-K541 Envelope Tracking and AM/AM,
AM/PM Predistortion.
Settings:
State............................................................................................................................444
I/Q Offset.....................................................................................................................444
Gain Imbalance...........................................................................................................445
Quadrature Offset........................................................................................................445
Skew........................................................................................................................... 445
IQ Delay...................................................................................................................... 446
Phase Offset................................................................................................................446
State
Activates the impairment of the I/Q signal.
If activated, the settings for I/Q offset, I/Q imbalance, and quadrature offset become
effective.
Remote command:
For analog impairments: [:SOURce<hw>]:IQ:IMPairment[:STATe] on page 1102
For digital impairments:
[:SOURce]:BB:IMPairment:RF<ch>:STATe on page 1102
[:SOURce]:BB:IMPairment:IQOutput<ch>:STATe on page 1102
[:SOURce]:BB:IMPairment:BBMM<ch>:STATe on page 1102
[:SOURce]:BB:IMPairment:FADer<ch>:STATe on page 1102
I/Q Offset
Sets a carrier offset (in percent) of the amplitudes (scaled to the peak envelope power
(PEP)) for the I and/or Q signal component. An ideal I/Q modulator suppresses the car-
rier offset completely (offset = 0 percent).
For more information, see:
●
Chapter 6.4.2.2, "I and Q Offset", on page 441
●
"To optimize the carrier leakage suppression" on page 447
Remote command:
For analog impairments:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I on page 1100
[:SOURce<hw>]:IQ:IMPairment:LEAKage:Q on page 1100
For digital impairments:
[:SOURce]:BB:IMPairment:BBMM<ch>:LEAKage:I on page 1100
[:SOURce]:BB:IMPairment:BBMM<ch>:LEAKage:Q on page 1100
[:SOURce]:BB:IMPairment:FADer<ch>:LEAKage:I on page 1100
[:SOURce]:BB:IMPairment:FADer<ch>:LEAKage:Q on page 1100
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:I on page 1100
Impairing the Signal