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WinIQSIM
3GPP W-CDMA
The constellation diagram of the perch channel, therefore, has the following appearance:
Fig. 8-48
Constellation diagram of a signal consisting of P-CCPCH, P-SCH and S-SCH
The four circular areas are due to P-CCPCH ("QPSK"), the linear areas (diagonals) to SCH ("BPSK").
The spreading/constellation diagram of P-CPICH, S-CPICH, S-CCPCH, PICH, AP-AICH, CD-AICH,
PDSCH, DL-DPCCH and DPCH are identical to the spreading/constellation diagram of P-CCPCH.
Envelopes
The following figures are based on a power of 0 dB.
To eliminate smearing of the amplitude due to the root cosine filter, all envelopes are calculated using a
square-wave filter.
The channels P-CPICH, S-CPICH, S-CCPCH, PICH, PDSCH feature a constant envelope during the
complete sequence.
Note:
Section 8.2.2.5.1, "Misuse TPC for output power control", describes how the envelope of
e.g. DPCHs can be varied.
The P-CCPCH is blanked during the first 256 chips of the slot.
Fig. 8-49
Envelope of P-CCPCH
1013.1642.02
8-45
E-5
