Service manual

Remote Commands for WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
214Operating Manual 1176.7649.02 ─ 04
carriers if the average trace is selected or a repeating group of 57 carriers if all the data
is requested.
TRACE1 Group Delay All analyzed trains
TRACE2 Group Delay Average trace
Group delay results are returned in ns.
Supported data formats (FORMat:DATA): ASCii|REAL
5.16.7 Spectrum FFT
All FFT points are returned if the data for this measurement is requested. This is 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 is returned in floating point format in dBm. TRACE1 is used for these measure-
ment results.
5.16.8 Statistics Bitstream Data
Data is returned depending on the selected standard from which the measurement was
executed:
●
For the IEEE 802.11a,j & n standard, data is returned in repeating groups of 52
data channels (or 56 channels within the n standard) where each symbol value is
represented by an integer value within one byte. Channel 0 is unused and there-
fore does not have any data associated with it, with no return data being provided.
●
For the IEEE 802.11b standard, the data is returned iin burst order. Each burst is
represented as a series of bytes. For each burst, the first 9 or 18 bytes represent
the PLCP preamble for short and long burst types, respectively. The next 6 bytes
represent the PLCP header. The remaining bytes represent the PSDU. Data is
returned in ASCII printable hexadecimal character format. TRACE1 is used for
these measurement results.
Supported data formats (see FORMat[:DATA] on page 176): ASCii|UINT
5.16.9 Statistics CCDF – Complementary Cumulative Distribution Func-
tion
Up to a maximum of 201 data points is returned in addition to a data count value. The
first value in the return data represents the quantity of probability values that follow.
Each of the potential 201 data points is returned as probability value and represents
the total number of samples that are equal to or exceed the corresponding power level.
TRACe Subsystem (WLAN)