CDP Composite (W-CDMA(3GPP)/HSPA)

Code Domain Power trace shows the power in each channel for the composite signal. Code Domain Power (CDP) is an analysis of the distribution of signal power across the set of Code Channels normalized to the total signal power. When Normalize IQ Traces is on, the power is expressed in dBc deciBels referenced to the carrier: A technique for expressing a power measurement in logarithmic form using the carrier power as a reference., and is relative to the total power in the signal. When Normalize IQ Tracesis off, the power is expressed in dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer. If the Measurement Interval is greater than one, all slots within the Measurement Interval are averaged together to produce the CDP Composite results.

CDP Composite trace data results are computed only from the first measured Slot after the Measurement Offset.

View CDP trace data as absolute power by clearing the Normalize IQ Traces check box (MeasSetup > W-CDMA(3GPP)/HSPA Demod Properties > Advanced tab).

MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. Measurements ( only): There is a seperate trace result for each measurement Antenna (x).

Display Format

The data is shown in a multi-color format that assigns a unique color to each code layer and related active Code Channels. This makes it easy to visually identify and distinguish the active Code Channel for a given code layer (Spread Code Length). The colors are also user definable (see Display Preferences > Color tab).

For CDP and CDE trace data displays with separate I/Q channel trace bars, to position the Marker to the desired Code Layer/Channel bar, click in close proximity to the horizontal bar that indicates the value of the Code Channel being measured.

The y-axis shows the power level and the x-axis shows the Code Channel. The x-axis annotation and marker location are based on the lowest symbol rate (ksym/sec), or equivalently, the highest Spread Code Length. Use the code order format parameter to rearrange the placement the displayed Code Channels (see Code Order).

This example Antenna 1 Composite CDP display Trace A Marker shows the following:

Symbol Rate:	30 Ksym/s
Spread Code Length:	128
Code Channel:	9
Power Level:	-14.937 dB
Asterisk *:	The asterisk (*) indicates that the marker is positioned on an active channel.

Use the CDP Layer trace data display to view only one code layer (Spread Code Length) at a time.