Agilent Technologies 8935 series e6380a Manual Do Utilizador

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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 
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