Chapter 16 563
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
Figure 16-79 DPCH Synchronization - Frame Timing Alignment
Figure 16-80 illustrates the frame number alignment for the DPCH channel. The frame number is aligned by
the frame sync trigger signal from the BTS. When using the frame clock, set the frame clock period to be
equal or greater than the longest transport channel TTI period (select 10, 20, 40, or 80 ms). In Figure 16-80,
Reference Measurement Channel 12.2k requires a frame clock of 20 ms or longer to achieve the correct
frame number alignment. Using a frame clock of 10 ms would cause an unpredictable frame timing
alignment with the transport channel TTI period. Best results are achieved when the frame clock is set to 80
or 2560 ms, or a system frame number reset signal is used. (The signal generator’s TTI period can be
measured on the TTI frame pulse from the rear panel.)
Figure 16-80 DPCH Synchronization - Frame Number Alignment
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