3-2 W-CDMA/HSPA+ Measurements W-CDMA/HSPA+ Signal Analyzer
3-2 PN: 10580-00234 Rev. T 3GPP MG
3-2 W-CDMA/HSPA+ Measurements
Carrier Frequency
Carrier Frequency is the selected transmitter operating center frequency entered by the user
or calculated from the signal standard and channel number entered by the user.
Carrier Feedthrough
Carrier Feedthrough measures the amount of unmodulated signal that is leaking through the
transmitter and is displayed in the Code Domain Power display. The W-CDMA 3GPP
specification does not specify carrier feedthrough measurement.
CDP
Code Domain Power displays how much of the channel power is in each Orthogonal Variable
Spreading Factor (OVSF code). Power is normalized to the channel power, so if a code reads
–10 dB, it means that the code is 1/10th of the channel power. Colors are applied according to
Table 3-1.
Note
Use an applicable band pass filter to eliminate out of band signals that can cause
mixer saturation.
Table 3-1. Channel Power Colors
Parameter Description Color VIewable on Display
CPICH Common Pilot Channel Red All CDP views
P-CCPCH Primary Common Control
Physical Channel
Magenta All CDP views
S-CCPCH Secondary Common
Control Physical Channel
Cyan All CDP views
PICH Paging Indicator Channel Green All CDP views
P-SCH Primary Sync Channel Navy Blue Control Channels
S-SCH Secondary Sync Channel Blue Control Channels
Traffic W-CDMA Traffic Yellow All CDP views
Noise Noise Grey All CDP views
HS-PDSCH High Speed Physical
Downlink Shared Channel
Orange HSPA+ Screen and CDP Screen
when the W-CDMA/HSPA+
option is installed
Note
In W-CDMA specification, the P-SCH and S-SCH are not assigned spreading
codes and therefore do not appear in the code domain power display. They have
special non-orthogonal scrambling codes and are on 10% of the time.
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