42
dBm
Advanced Channel Emulator
ACE9600
Operations Manual
into the hardware. The delay function requires a period of time,
typically a few seconds, to initialize. The background color in the delay
field will be white during this initialization. Once a dynamic run is
started by pressing the
Start
hard key, implementation of subsequent
data points in each file begins.
While running, the displayed elapsed time counter (labeled
“
Time
”
on
the display) increments. Parameter values are changed at the update
rate, which is selectable from 1 sample per second, up to 1 sample per
millisecond. Parameters that are changing will have a white
background. Parameters, for which no dynamic file is loaded, will
remain at the pre-existing value and retain the normal background
color.
Each of the parameters, Delay, Attenuation, Frequency Offset, Phase
Offset and AWGN are changed synchronously at the selected update
rate. When multiple parameters are being controlled by dynamic files,
data point #n in each file is updated on the same update clock edge.
Delay, Frequency Offset, Phase Offset and Attenuation are not changed
instantaneously; rather they slew from the initial point to the final point
over one update period. The slew rate can be calculated as (change in
value)/(update period). Note that a file can be run at various update
rates, which will result in different slew rates. An example is given
below:
Delay data value
Rate of change at 1
msec update
Rate of change at 20
msec update
10.200000
10.200010
10 nsec/msec
10 nsec/20msec
10.200110
100 nsec/msec
100 nsec/20msec
10.200010
100 nsec/msec
100 nsec/20msec
AWGN dynamic files provide direct control of the noise density output
power. Note that the ACE9600 does not calculate Eb/No ratio in
dynamic mode.
