432 Chapter 15
W-CDMA Digital Modulation for Component Test
W-CDMA Concepts
Figure 15-11 TPC Bits per Timeslot
Understanding TFCI, TPC, and Pilot Power Offsets
TFCI, TPC, and Pilot power offsets (PO), which are applied to downlink control channels (DPCCH), are
relative to the transmit power for data channels (DPDCH). Usually, these offsets are set to a positive value
(refer to Figure 15-12 on page 432). The intent is to transmit control symbols at a higher level than data
symbols to maintain the link between mobile and base. Because only the DPCCH transmit power is offset,
the total transmit power is minimized and less noise is generated in the system.
Figure 15-12 TFCI, TPC, and Pilot Power
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