
Chapter 15 419
W-CDMA Uplink Digital Modulation for Receiver Test
DPCH
NOTE C/N values less than 10 dB may not be visible on a spectrum analyzer.
You have now set the E
b
/N
o
value for the DPDCH channel to 10 dB. Notice that modifying the
E
b
/N
o
value for a channel will change the overall carrier to noise ratio and the E
b
/N
o
value for
all other active channels. The 10 dB setting for E
b
/N
o
has decreased the C/N value to where
the W-CDMA signal is almost hidden by the noise. For reliable results when making hand
calculations to determine or verify E
b
/N
o
values, it is recommended that you first scale the
code domain power to 0 dB to display the normalized relative channel power levels (see
“Scaling to 0 dB” on page 429).
Figure 15-45 E
b
/N
o
Setting
Using the Transmit Power Control
The tasks in this procedure teach you how to set up dynamic DPCH power control using an
external signal. In this closed loop example, the ESG is used to communicate a UE response to
TPC commands.
Added Noise Level
W-CDMA Signal
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