Digital Standard 3GPP W-CDMA (FDD) SMIQ
1125.5555.03 E-92.222
P-SCH and S-SCH are active during the first 256 chips only:
Fig. 2-137 Envelope of P-SCH or S-SCH
AP-AICH and AICH are transmitted only during the first 4096 chips of the signal:
Fig. 2-138 Envelope of AICH (Subchannel)
AP-AICH and AICH consist of up to 16 superimposed single channels that are modulated with different
orthogonal vectors. In some sections, cancellations or excessive levels may result. The following
diagram shows the signal with the input pattern "1010":
Fig. 2-139 Envelope of AICH (four subchannels)
The DL-DPCCH is used during transmission of the PCPCH to readjust the output power of the mobile.
Since there is no data transfer to the mobile in this phase, the DL-DPCCH is based on a DPCH
(7.5 ksps without TFCI), the data fields of which are blanked (“DTX“):
Fig. 2-140 Envelope of DL-DPCCH
At first, DPCHs are permanently active, however the TFCI fields are blanked at high data rates
(>= 60 ksps) if no TFCI information is transferred ("DTX"). A 60-ksps channel, for example, then has the
following appearance:
Fig. 2-141 Envelope of DPCH 60 ksps without TFCI
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