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Chapter 5 139
CDMA Measurements - Screens and Control Fields
CDMA Measurements
Code Domain Measurements – IS-95
If you have selected IS-95 only in the INSTRUMENT CONFIGURE
screen, the Code Domain screen will appear as described in this section,
with the Walsh Code ordering following the Hadamard paradigm, with
64 channels, total. These channels are referred to as “I” channels.
If you wish to make use of the extended Walsh ordering - Bit Reverse -
as described by the IS-2000 standard, see See “Code Domain
Measurements – IS-2000” on page 142.
The following measurements are displayed on the CODE DOM (code
domain analyzer) screen: power, fast power, timing and phase.
Measurements are selected from the Measurement field on the Main
controls menu.
Time offset (Tm Ofs) and frequency error (Freq Err) are always
displayed when any code domain measurement is made. Carrier
feedthrough (CarFT) is also displayed except when fast power is
measured.
Figure 5-5 Code Domain Power
Code Domain Power, IS-95
The Test Set provides two code domain power measurements.
• Absolute code domain power displays the power in each of the 64
Walsh channels, relative to the total power inside a 1.23 MHz
bandwidth centered at the tune frequency. The 64 Walsh channels (0
through 63) are represented by a vertical bar on the analyzer’s
display. To measure absolute code domain power the Ch pwr unit
field on the CD Setup menu must be set to Abs (see Figure 5-6). Use
the Marker controls to move the marker to the Walsh channel (Walsh
Chan) you want to measure (see Figure 5-7 on page 140).
Code Domain
Frequency Domai
n
0123456789 32 63
User
1
User
3
User
2
Walsh Code
Pilot
Paging
Sync h
User #2
User #1
Synch
Paging
Pilot
1.2288 MHz
freq
Other users & noise
Frequency Domain
Code Domain