Technical data

568 Chapter 19
W-CDMA or W-CDMA (with HSDPA) Analyzer
Metrics Provided by the W-CDMA or W-CDMA (with HSDPA) Analyzer
W-CDMA or W-CDMA (with HSDPA)
Analyzer
Metrics Provided by the W-CDMA or W-CDMA (with
HSDPA) Analyzer
This section contains descriptions of the individual W-CDMA or W-CDMA (with
HSDPA) transmitter metrics in the Metrics view of the screen. For information on
expected result values and possible causes of error if the expected results are not
met, see “Interpretation of Measurement Results” on page 571.
Frequency
Frequency is the selected transmitter operating frequency entered by you (or
calculated from the channel number entered by you).
Freq Error (Frequency Error)
Frequency error, as set up in Controls, is the frequency difference between your
transmitter's actual center frequency and the frequency (or channel) you entered.
Scramble Code
The Scrambling Code being measured (manual or auto). In W-CDMA or W-CDMA
(with HSDPA), each Access Network (or BTS) output signal is scrambled by
multiplying each of its data channels by a unique pseudo-noise (PN) code. In the
W-CDMA specifications, this is referred to as a Scrambling Code.
Noise Floor
Noise Floor is the average power level of all the inactive channels.
Threshold
Threshold is the active channel threshold level and is an advanced setting that can be
set to indicate which code channels are considered active. (For more information,
see “Setting the Active Channel Threshold Level and Auto Threshold Level” on
page 562.)
EVM Pilot and EVM Comp (Pilot and Composite Error Vector
Magnitude)
EVM is the measure of signal quality specified as a percent of noise to pure signal.
It is the difference between the measured waveform and the theoretical modulated
waveform (the error vector). EVM metrics are used to measure the modulation
quality of a transmitter. The 3GPP standard requires the Composite EVM not to