SMIQ Fading Simulation
1125.5555.03 2.75 E-9
PATH
The following parameter have to be set separately for each path.
STATE
Switching on and off a path. If the cursor is placed onto a path in the diagram,
it may be switched on and off by pressing one of the unit keys (toggle
function).
IEC/IEEE-bus command :SOUR:FSIM:PATH3:STAT ON
PROFILE
Selection of the fading profile.
pDOPP (Pure DOPpler) Simulation of a transmission path having a single
direct connection from the transmitter to the moving receiver
(discrete component). The Doppler Frequency shift is determined
by the parameters DOPPLER FREQ and FREQ RATIO.
IEC/IEEE-bus command :SOUR:FSIM:PATH4:PROF PDOP
RAYL (RAYLeigh) Simulation of a radio field, where a multitude of
broadly scattered partial waves hit upon a moving receiver. The
receiving amplitude resulting therefrom is time-varying. The
probability density function of the receiving amplitude is described
by a Rayleigh distribution. The fading spectrum is a classical
Doppler spectrum.
IEC/IEEE-bus command :SOUR:FSIM:PATH1:PROF RAYL
RICE Simulation of a radio field, where apart from a multitude of
scattered partial waves, one strong direct wave (discrete
component) hits upon a moving receiver. The probability density
function of the receiving amplitude is described by a Rice
distribution. The fading spectrum of an unmodulated signal is an
overlapping of a classical Doppler spectrum with a discrete
spectrum line.
IEC/IEEE-bus command :SOUR:FSIM:PATH7:PROF RICE
CPHAS A radio traffic area without direct and random waves is generated
for this fading type (no discrete and no static component).
The path is multiplied by a constant "pointer“ according to the
path-specific parameter.
IEC/IEEE-bus command :SOUR:FSIM:PATH3:PROF CPH
DISCRETE COMP
Shows the status of the discrete component (ON or OFF).
IEC/IEEE-bus command :SOUR:FSIM:PATH4:DCOM:STAT ON
POWER RATIO
Input value of the power ratio of the discrete component and distributed
component with Ricean fading switched on. If POWER RATIO is changed the
sum of both components remains constant.
IEC/IEEE-bus command :SOUR:FSIM:PATH6:PRAT 3
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