Fading Simulation SMIQ
1125.5555.03 2.74 E-9
STANDARD
Opens a window for selecting a standard setting of the fading paths. The
parameter settings comply with the measurement specifications of mobile
communication standards (e.g. GSM, CDMA, NADC).
With standards TETRA TYPICAL URBAN and TETRA HILLY TERRAIN, all
6 paths are used with these parameters instead of the stipulated 2 paths. This
yields an improved residual carrier with the same output signal.
IEC/IEEE-bus command SOUR:FSIM:STAN CDMA100
SPEED UNIT
Selection of the speed unit.
IEC/IEEE-bus command :SOUR:FSIM:SPE:UNIT KMPH
INSERTION LOSS
SETTING MODE
Selection of setting mode for the insertion loss of the fading simulator.
NORMAL The minimum insertion loss for a path of the fading simulator is
fixed to 18 dB. The value has been chosen so that even with Log
Normal-Fading switched on, the fading simulator will seldom be
overdriven. This setting should be chosen for BER measurements.
IEC/IEEE-bus command :SOUR:FSIM:ILOS:MODE NORM
LOW_ACP The minimum insertion loss is between 6 and 12 dB. The value
depends on the PATH LOSS setting of the selected paths. This
mode is ideal for all STANDARD menu settings regarding
signal/noise ratio and residual carrier suppression. This setting
should be chosen for measurements which involve an adjacent-
channel interfering signal generated by the SMIQ.
IEC/IEEE-bus command :SOUR:FSIM:ILOS:MODE LACP
SHOW PATHS
Switching from the display of paths 1 to 6 to the display of paths 7 to 12.
COUPLED
PARAMETERS...
In this submenu, parameters SPEED, COEFF, LOCAL CONST and STD DEV
can be coupled via the ON setting. If one of these parameters is modified
afterwards in a particular path, the parameters of all other paths will be modified.
SPEED SETTING COUPLED ON Parameters coupled for all paths.
OFF Parameter can be set individually.
IEC/IEEE :SOUR:FSIM:COUP:SPE ON
CORR COEFF SETTING ON Parameters coupled for all paths.
COUPLED OFF Parameter can be set individually.
IEC/IEEE :SOUR:FSIM:COUP:CORR:COEF ON
LOCAL CONST SETTING ON Parameters coupled for all paths.
COUPLED OFF Parameter can be set individually.
IEC/IEEE :SOUR:FSIM:COUP:LOGN:LCON ON
STD DEV SETTING COUPLED ON Parameters coupled for all paths.
OFF Parameter can be set individually.
IEC/IEEE :SOUR:FSIM:COUP:LOGN:CSTD ON
SET SECOND SMIQ
CREST FACTOR TO
Indication of crest factor which has to be set on the second SMIQ in the vector
modulation menu so that the insertion loss caused by the fading simulator (in the
first SMIQ) is compensated correctly on the second SMIQ.
IEC/IEEE-bus command :SOUR:FSIM:CFAC:EXT?
SET DEFAULT
Default setting of path parameter with path 1 switched on and all other paths
switched off.
IEC/IEEE-bus command :SOUR:FSIM:DEF
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