
450 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
Figure 15-69 illustrates the frame number alignment for the PRACH channel. The frame
number is aligned by the frame sync trigger signal from the BTS. Best results are achieved
when the frame clock is set to 80 or 2560 ms, or a system frame number reset signal is used.
When the sync trigger is a frame clock of 10, 20, or 40 ms, the signal generator can align
frame timing. However, an 80 ms period must equal the cycle of sub-channel 0 and frame
boundary to achieve frame number alignment. (The signal generator’s frame number
alignment can be observed on the 80 ms frame pulse from the rear panel.)
Figure 15-69 PRACH Synchronization - Frame Number Alignment
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