R&S FSL TRACe Subsystem (WiMAX, K92/K93)
1300.2519.12 6.859 E-11
Spectrum FFT
All FFT points will be returned if the data for this measurement is requested. This will be an exhaustive
call, due to the fact that there are nearly always more FFT points than IQ samples. The number of FFT
points is the number presented by a power of 2 that is higher than the total number of samples.
E.g. if there were 20000 samples, then 32768 FFT points would be returned.
Data will be returned in floating point format in dBm. TRACE1 is used for this measurement results.
Statistics Bitstream data
Data will be returned depending on the selected standard from which the measurement was executed:
• For the IEEE 802.16–2004 OFDM standard, data is returned in repeating groups of 200 data
channels where each symbol value will be represented by an integer value within one byte.
Channel 0 is unused and will therefore not have any data associated with it, with no return data
being provided.
• For the IEEE 802.16e–2005 OFDMA standard, the data is returned in groups of the selected FFT
size, where each symbol value will be represented by an integer value within one byte. The FFT
size is either 128, 512, 1024, or 2048 sub carriers. Unused carriers, including the zero carrier, are
also returned. They are denoted by the string value NAN.
The number of repeating groups that are returned will be equal to the number of measured symbols.
64QAM has the highest data rate and it contains symbol values up to 63, making one byte sufficient in
size to represent all symbol data values, regardless of the modulation type in use.
Data will be returned in ASCII printable hexadecimal character format. TRACE1 is used for this
measurement results.
Statistics Burst Summary data
The return data depends on the current standard and measurement results.
For the IEEE 802.16–2004 OFDM standard, the data will be returned in repeating groups of 6 comma
separated values as follows:
• 1st value – burst number
If this value is 0 then it is an FCH burst.
• 2nd value – area with:
0 = preamble
1 = data
• 3rd value – modulation with:
0 = BPSK
1 = QPSK
2 = 16QAM
3 = 64QAM
• 4th value – symbol length
This is an integer value giving the number of symbols in the current area.
• 5th value – power in dBm for the current area
This is returned as a float
• 6th value – EVM in dB for the current area
This is returned as a float.
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