CP/CS Repeat Index (Custom OFDM)
This parameter is shown in the Frame Definition tab and the Format tab. When Frame Definition > Apply is clicked, the value in the Frame Definition tab is applied to the Format tab (and the signal).
specifies the cyclic prefix and cyclic suffix (also referred to as guard interval) repeat index - If the Cyclic Prefix/Suffix (Ratio) Per Symbol arrays are at least as long as the measurement result length, it provides a cyclic prefix/suffix 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 CP 1) Contention period, or 2) Cyclic prefix Repeat Index. For clarity in the explanation below, let RepeatIndex equal the CP/CS Repeat Index, and ArrayLength equal the length of the Cyclic Prefix/Suffix (Ratio) Per Symbol arrays. There are four possible cases:
-
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. -
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. -
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.
See Also
