Teledyne LeCroy QPHY-UWB - Manual (Page 11)

QPHY-UWB Software Option
QPHY-UWB-OM-E Rev C
11
Selecting the Source for the UWB Waveform to be analyzed
Selecting Input source control brings up a list of possible sources for waveform analysis. Select the one
containing the packet for analysis. Any of the 4 input channels, 4 memories, or 8 math functions can be used as a
source.
Specifying the MB-OFDM parameters for the packet to be analyzed
The section labeled Signal Setup, as follows, is used to specify the MB-OFDM parameters used by the radio
when it transmitted the packet. You will need to enter the TFC (Time-Frequency Code), Band Group, and the
Data Rate in order for the oscilloscope to know how to analyze the packet. If they are selected incorrectly, it may
not be possible for the UWB analysis package to perform most of the analysis described below. The
Spectrogram analysis doesn’t require any of this information, so it can be used to view the spectrogram of the
packet. The spectrogram information can be used to determine the TFC and Band group, if these are unknown.
Setting the Time Frequency Code (TFC)
Select the TFC control to set the TFC value for the packet to be analyzed. Some reference information about TFC
values:
•
TFC values range from 1 to 10. (PHY 1.1 specification defines 1-7; upcoming PHY 1.2 specification defines 8,
9, 10)
•
TFC 1: symbol 1 = Lowest band, symbol 2= mid band, symbol 3 = high band and repeats 1,2,3 1,2,3
• TFC 2: 1, 3, 2 .1, 3, 2 .
• TFC 3: 11, 22, 33 11, 22, 33 .
• TFC 4: 11, 33, 22 .
• TFC 5, 6, 7: FFI mode (Fixed Frequency Interleave)
• TFC 8, 9, 10: two band time frequency interleaved: 1,2; 2,3; and 1,3
Note: When working in TFC 5, 6, or 7 there is only going to be 1 PSD mask. In fact there should be no energy in
the other bands.