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 (Eb) and the noise spectral density (No), 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

160

Chapter 5

C:\Spk\Ref\RefGuideRevE\CdmascrnE2.fm

Page 157
Image 157
Agilent Technologies 8935 series e6380a manual Gen Mode, Gen Special