Keysight N9000B - Page 186

3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
Condition n Return Value
trace data
Modulation
Format = Offset
QPSK
6 IQ Meas Time – returns a series of floating point numbers that
alternately represent I and Q pairs of the corrected measured
trace. The magnitude of each I and Q pair are normalized to 1.0.
The first number is the I sample of symbol 0 decision point and
the second number is the Q sample of symbol 0 decision point.
There are X points per symbol (X=points/symbol). Therefore, the
series of numbers is:
1
st
number = I of the symbol 0 decision point
2
nd
number = Q of the symbol 0 decision point
…
(2*X)+1 number = I of the symbol 1 decision point
(2*X)+2 number = Q of the symbol 1 decision point
…
(2*X)*N+1 th number = I of the symbol N decision point
(2*X)*N+2 th number = Q of the symbol N decision point
Modulation
Format = 2 FSK
6 FSK Meas Time – returns a series of floating point numbers that
represent the data of the corrected measured trace
Modulation
Format = Offset
QPSK
7 IQ Ref Time – returns a series of floating point numbers that
alternately represent I and Q pairs of the reconstructed
reference trace. The magnitude of each I and Q pair are
normalized to 1.0. The first number is the I sample of symbol 0
decision point and the second number is the Q sample of symbol
0 decision point. There are X points per symbol
(X=points/symbol). Therefore, the series of numbers is:
1
st
number = I of the symbol 0 decision point
2
nd
number = Q of the symbol 0 decision point
…
(2*X)+1 number = I of the symbol 1 decision point
(2*X)+2 number = Q of the symbol 1 decision point
…
(2*X)*N+1 th number = I of the symbol N decision point
(2*X)*N+2 th number = Q of the symbol N decision point
Modulation
Format = 2 FSK
7 FSK Ref Time – returns a series of floating point numbers that
represent the data of the reconstructed reference trace
Modulation
Format = Offset
QPSK
8 IQ Meas Spectrum – returns the spectrum of the IQ corrected
measured time trace
Modulation
Format = 2 FSK
8 FSK Meas Spectrum – returns the spectrum of the corrected
measured time trace
186 Short Range Comms & IoT Mode User's &Programmer's Reference