Agilent Technologies 8935 series e6380a Manuale Utente
160
Chapter 5
C:\Spk\Ref\RefGuideRevE\CdmascrnE2.fm
CDMA Measurements - Screens and Control Fields
Control Fields for CDMA Measurements
Gen Mode
This field selects the type of modulation information sent to the CDMA
generator’s IQ modulator.
generator’s IQ modulator.
•
Data
allows data to be transmitted to simulate a traffic channel with
no additive noise. (See
.)
•
Eb/No
causes a combination of data and White Gaussian Noise
(AWGN) noise to be transmitted. The value entered is the ratio
between the energy of each information bit (E
between the energy of each information bit (E
b
) and the noise
spectral density (N
o
), expressed in dB.
•
Noise
causes a signal modulated by White Gaussian Noise to be
generated. The noise is band limited to 2 MHz and white inside a
1.25 MHz bandwidth centered around the
1.25 MHz bandwidth centered around the
RF Gen Freq
. This
selection removes the
Data Source
,
Start Frame
, and
# of Frames
fields from the screen; those fields are only used with the
Data
and
Eb/No
entries.
Screens on which this field is present
CDMA GENERATOR
Gen Special
Generator special modes change how IQ modulated signals are
generated.
generated.
•
Normal
sets the CDMA generator and CDMA analyzer to create and
analyze signals with standard rotation.
•
Inverted
sets reverse rotation for I and Q signals; opposite to the
direction specified in the IS-95 standards. In this mode, the CDMA
generator creates reverse-rotation IQ signals and the CDMA
analyzer expects reverse-rotation IQ signals.
generator creates reverse-rotation IQ signals and the CDMA
analyzer expects reverse-rotation IQ signals.
Screens on which this field is present
CDMA GENERATOR