R&S FSL TRACe Subsystem (WLAN, K91 / K91n)
1300.2519.12 6.747 E-11
Spectrum Flatness
There are four separate traces that are available with this measurement. Trace data for a particular
trace will only be returnable by querying the appropriate trace
Spectrum flatness provides two basic graph types. These are an absolute power value graph (ABS) and
a relative group delay graph, which are both plotted on a per carrier basis. All 52 carriers are drawn, in
addition to the unused 0 carrier. Both the absolute power and group delay graph groups will allow all the
data points to be returned as one trace and an average of all the channels as the other trace.
E.g. the return data will either be one single group of 53 carriers if the average trace is selected or a
repeating group of 53 carriers if all the data is requested.
TRACE1 ABS (all analyzed trains)
TRACE2 Group Delay (all analyzed trains)
TRACE3 ABS (average trace)
TRACE4 Group Delay (average trace)
Absolute power results are returned in dB and group delay results are returned in ns.
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
IEEE 802.11a & j only
Data will be returned in repeating groups of 52 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.
The number of repeating groups that are returned will be equal to the number of measured symbols.
Currently, 64QAM has the highest data rate and it contains symbol values up to 63, making the
proposal of 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.
IEEE 802.11b only
Data will be returned in burst order. Each burst will be represented as a series of bytes. For each burst
the first 9 or 18 bytes represents the PLCP Preamble for Short and Long burst types respectively. The
next 6 bytes represents the PLCP Header. The remaining bytes represent the PSDU.
Data will be returned in ASCII printable hexadecimal character format. TRACE1 is used for this
measurement results.
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