Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard 3GPP W-CDMA (FDD)The following associated constellation diagram is obtained:Fig. 2-151 Constellation of a signal with two DPCHs (uncorrelated data)The new crest factor is 7.64 dB. Compared to section 2.14.3.1 the value has decreased since withconstant peak value the average value has increased.2.14.3.3.3 16 DPCHs with Uncorrelated DataIf the data of all channels are uncorrelated, the constellation diagram is obtained similarly tosection 2.14.3.3 by multiple superposition of the basic constellation. Whether all possible points (channelnumber+1) 2 = 17*17 = 289 will be displayed depends on the data sequences and the sequence length.Note: In contrast to the last constellation diagrams, the following diagrams were recorded with activereceiver filter (root cosine 0.22). This allows better differentiation of the individual points.Setting of the receiver filter is described in section 5.17.Example for 16 time slots:Fig. 2-152Constellation with 16 uncorrelated channels (16 time slots)This signal has a crest factor of 15.35 dB. The crest factor increases with the number of channels sincethe increase of the average value is slower than that of the peak value (cancelling effects).1125.5555.03 2.227E-9