Rohde & Schwarz CMU-K20, Operating Manual

Page: 109 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Power Measurements
1115.6088.12 4.31 E-11
Average power denotes the RF carrier power averaged over the useful part of the
measured burst (application P/t Normal 8PSK) or of the measured timeslot
(application P/t Multislot with 8PSK modulation, see Slot Count softkey on p. 4.57 ).
Owing to the characteristics of 8PSK modulation, the amplitude of the RF signal varies with
the transmitted data. As a consequence, only the long term average of the power when taken
over the useful part of the burst for random data represents a correct measure for the output
power of the mobile phone. This long time average (rather than the average power of the
current burst) is also the correct reference power (0-dB line) for the
P/t Norm. 8PSK
measurement.
The Average setting ensures that a correct reference power is used, however, averaging
results in a longer measurement time. In the Data Compensated mode, a known data
sequence is used to correct the measured average power of the current burst and estimate
the correct reference power. Delays due to averaging are avoided.
Remote control
CONFigure:POWer[:NORMal]:EPSK:CONTrol:RPMode
CURRent | AVERage | DCOMpens
P/t Multislot –
Timing Offset The Timing Offset shifts the burst by the entered number of symbol periods, e.g. to
compensate for a known, constant timing error of the MS. The burst is shifted
relative to the time axis and the tolerance template for the multislot burst analysis.
Therefore, the value of
Timing Offset affects the result of the tolerance check.
Remote control
CONFigure:POWer:MSLot:TOFFset
P/t Multislot –
Modulation View The Modulation View section defines the expected modulation scheme in all four
timeslots that can be measured and adjusts the power/time template. To obtain a
valid measurement result, the actual modulation in all measured slots must be
compatible with the
Modulation View settings. Otherwise, the CMU displays a
warning: "Signal does not match configuration!"
The following settings are provided for all slots:
GPSK GMSK modulation expected; the GMSK power/time template is used
8PSK 8PSK modulation expected; the 8PSK power/time template is used
ANY Arbitrary modulation scheme; the CMU determines the modulation of
the measured burst and uses the appropriate template. Valid results
are obtained with both GMSK and 8PSK modulation.
OFF No signal expected: timeslot must be inactive to obtain a valid result
The Modulation View settings are ignored for all slots that are not measured.
Remote control
CONFigure:POWer:MSLot:MVIew
P/t Multislot –
Slot Count The Slot Count defines an integer number of timeslots to be measured in the P/t
Multislot application. The actual time range measured is larger than the integer
number of slots because it comprises an additional display margin; for details see
remote control command description.
Remote control
CONFigure:POWer:MSLot:SCOunt
深圳德标仪器
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