Digital Standard 3GPP W-CDMA (FDD)
SMIQ
1125.5555.03
E-9
2.228
The same diagram for a signal with one slot only is obtained:
Fig. 2-153
Constellation with 16 uncorrelated channels (1 time slot)
The crest factor has the value of 15.35 dB even if the CCDF has a different characteristic.
2.14.3.3.4
16 DPCHs with same Data
Similar to section 2.14.3.3.2 there are strong cancellation effects and only points remain on the axes.
The position of the points also depends on the choice of the channelization codes. The following
diagram is an example for 16 channels, channelization code 0 to 15:
Fig. 2-154
Constellation diagram of 16 DPCHs with same data
In this case the crest factor is 16.17 dB. The high value arises because about 94 % of the points lie at
the origin and only 6% of the points at the outer positions.
