
314 Chapter 13
W-CDMA Digital Modulation for Component Test
W-CDMA Concepts
Figure 13-6 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 13-7 on page 315). 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.
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