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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.
• Data allows data to be transmitted to simulate a traffic channel with
no additive noise. (See “Data Source” on page 157.)
• 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
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 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.
• 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.
Screens on which this field is present
CDMA GENERATOR