3 VMA Mode
3.2 Custom OFDM Measurement
Repeat Index
If the Guard Interval Per Symbol array is at least as long as the measurement result
length, it provides a guard interval value for each symbol. If the array is shorter than
the measurement result length, processing loops back and re-uses the array (and
keeps looping back every time the end of the array is reached again). The location
within the array that is looped back to is determined by the Repeat Index. There are
four possible cases:
1 RepeatIndex ≥ 0
and RepeatIndex
< ArrayLength
This is the normal case
The repeat index specifies which entry in the array to loop back to (the
index is zero-based). Each time the end of the array is reached, it
loops back to this entry in the array. A value of zero (which is the
default) therefore means that it loops back to the start of the array. A
value of ArrayLength−1 means that it loops back to the last value in
the array, so the last value is used over and over
2 RepeatIndex ≥
ArrayLength
The repeat index points beyond the end of the array. It is treated as
though RepeatIndex = ArrayLength−1, so the last value in the array is
repeated over and over
3 RepeatIndex < 0
and RepeatIndex
≥ −ArrayLength
A negative value means the repeat index is an offset from the end of
the array. A value of −1 means the last value in the array is repeated
over and over. A value of –ArrayLength means that it loops back to the
start of the array
4 RepeatIndex <
−ArrayLength
The negative value is larger than the array length, so it is too large to
be an offset from the end of the array. It is treated as though
RepeatIndex = –ArrayLength, so that it loops back to the start of the
array
Remote
Command
[:SENSe]:OFDM:CCARrier0|…|7:GUARd:INTerval:RINDex <integer>
See table above for <integer> values
[:SENSe]:OFDM:CCARrier0|…|7:GUARd:INTerval:RINDex?
Example
:OFDM:CCAR0:GUAR:INT:RIND 1
Preset 1
Min 1
Max 2147483647
Guard Interval Values (Remote Command Only)
Specifies the guard intervals (also called cyclic prefix) separately for each symbol.
Each is specified as a fraction of the OFDM FFT length. The values are unitless (not
percent).
Remote
Command
[:SENSe]:OFDM:CCARrier0|…|7:GUARd:INTerval <real>, <real>, …
[:SENSe]:OFDM:CCARrier0|…|7:GUARd:INTerval?
509 Vector Modulation Analyzer Mode User's &Programmer's Reference
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