CDMA Measurements - Screens and Control Fields

Control Fields for CDMA Measurements

Data Source

This field selects where the baseband quadrature spreader gets its data. This field is removed when the Gen Mode field is set to Noise.

Zeroes uses a data stream of all 0’s that is not encoded before being applied to the baseband quadrature spreader and output.

Ext uses external data from the DATA IN connector. This data is not encoded before being applied to the baseband quadrature spreader.

Random uses 300 frames of random, error-free data. (See Data Buff (below) for Single/Cont, Idle/Send operation.)

Data Buff uses data previously loaded into the data buffer.You can load your own data into the buffer over GPIB. This data is encoded before baseband quadrature spreading. Choosing this selection displays these additional fields:

Single/Cont

Single causes the data stream to be output once when Send is selected.

Cont causes the data stream to be repeated continuously when Send is selected. Changing to single operation while sending causes the data to be interrupted after the current 20 ms frame.

Idle/Send

Idle indicates that data from the buffer is not being transmitted. Selecting Idle while sending data interrupts the data at the completion of the current 20 ms frame. A data stream of all zeroes (encoded) continues to be transmitted after the initial data stream is interrupted. This is different from the Zeroes selection above where the data is not encoded.

Send causes the data stream to be output after two rising edges of the internal 80 ms clock are detected.

Start Frame specifies the first frame of data to send.

# of Frames specifies how many frames of data to send.

Screens on which this field is present

CDMA GENERATOR

Chapter 5

157

Page 154
Image 154
Agilent Technologies 8935 series e6380a manual Data Source