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Chapter 5 171
CDMA Measurements - Screens and Control Fields
Control Fields for CDMA Measurements
Sprd Fact (Spread Factor)
This selectable IS-2000 Code Domain field shows the spread factor
(Walsh set) of the currently selected channel. The spread factor
represents the number of Walsh channels available if all channels use
this spread factor. A spread factor of 128 corresponds to a Walsh order
of 7 and a channel width of 1 (out of 128). A spread factor of 8
corresponds to a Walsh order 3 and a channel size of 16. The spread
factor is inversely proportional to the number of channels being used to
generate a signal: The lower the spread factor the greater the number
of channels being used to generate the signal. A lower spread factor,
while using up bandwidth can accommodate a large amount of data,
resulting in a higher data rate.
Lower spread factors are usually reserved for data transmission while
higher spread factors are used for voice transmission.
Screens on which this field is present
CODE DOM (Code Domain Analyzer, IS-2000)
Start Frame
See “Data Source” on page 157.
Threshold
For Code Domain measurements. Enter the measurement display
threshold for making code domain measurements. Walsh channels that
have power levels below the threshold value are not displayed as active
channels.
Operating Considerations
Querying Phase and Timing measurements for Walsh channels that are
below the threshold level using GPIB will return a default value of
9e99.
Screens on which this field is present
CODE DOM (Code Domain Analyzer): auxiliary controls menu