SMIQ Digital Standard W-CDMA (NTT DoCoMo/ARIB 0.0)
1125.5555.03 E-92.157
MODULATION...
Opens a window for setting the modulation parameters.
Menu selection: DIGITAL STD - WCDMA - MODULATION...
FREQ
100. 000 000 0
MHz
FREQUENCY
LEVEL
ANALOG MOD
VECTOR MOD
DIGITAL MOD
DIGITAL STD
LF OUTPUT
SWEEP
LIST
MEM SEQ
UTILITIES
WCDMA
PHS
IS-95
WCDMA
NADC
PDC
GSM
DECT
STATE
MODE
SET DEFAULT
CHIP RATE
LINK DIRECT
MODULATION...
TRIGGER MODE
EXECUTE TRIGGER>
TRIGGER....
CLOCK
TOTAL POWER
LEVEL
-30.0
dBm
PEP
-14.9.
dBm
MODULATION TYPE... QPSK 2b/sym
CHIP RATE VARIATION 4.096 Mcps
FILTER... WCDMA 0.22
FILTER MODE LOW_ACP LOW_EVM
LOW DISTORTION MODE OFF ON
Fig. 2-91 Menu DIGITAL STD - WCDMA - MODULATION..., equipped with options modulation coder
SMIQB20, data generator SMIQB11 and SMIQB43
(MODULATION...) MODULATION TYPE
Selection between the types of modulation QPSK
and offset QPSK.
IEC/IEEE-bus :SOUR:WCDM:FORM QPSK
CHIP RATE
VARIATION
Setting value for the chip clock frequency. The value
for CHIPRATE from the main menu is preset. CHIP
RATE VARIATION modifies the output clock and the
modulation bandwidth as well as the output
synchronization signals. It has no effect on the
calculated chip sequence.
IEC/IEEE-bus :SOUR:WCDM:CRAT:VAR 4096001
FILTER...
Opens a window for selecting the baseband filter.
Selection can be made between a filter optimized for
W-CDMA, the standard Nyquist filters COS and
SQRCOS or a user-defined filter USER (cf. Section
Digital Modulation) is possible. The optimized root
cosine filter WCDMA 0.22 is preset. Its roll-off factor
is fixed to 0.22.
IEC/IEEE-bus :SOUR:WCDM:FILT:TYPE WCDM
ROLL OFF FACTOR
Setting value of roll-off factor.
The setting is only possible provided that a COS or
SQRCOS filter is selected under FILTER.
IEC/IEEE-bus :SOUR:WCDM:FILT:PAR 0.22
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