Technical data

Chapter 19 569
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
exceed 17.5% for normal W-CDMA (defined as Test Models 1 and 4), and not to
exceed 12.5% in the case of 16QAM HSDPA (defined as Test Model 5).
PCDE (Peak Code Domain Error)
PCDE takes the noise and projects the maximum impact it will have on all OVSF
codes. PCDE is the maximum value for the code domain error for all codes (both
active and inactive).
In W-CDMA or W-CDMA (with HSDPA), specifically to address the possibility of
uneven error power distribution, the EVM measurement has been supplemented
with PCDE. The 3GPP standard requires the PCDE not to exceed –33 dB at a
spreading factor of 256, but the Conformance Test adds in a Test Tolerance of 1dB.
This gives a Conformance Limit for Peak Code Domain Error of –32dB at a
spreading factor of 256.
Carr Feedthru or Carr FT (Carrier Feedthrough)
Carrier Feedthrough is a result of the RF carrier signal feeding through the I/Q
modulator and riding on the output circuitry without being modulated.
Chan Pwr (Channel Power)
Channel Power is the integrated power within a defined bandwidth. For W-CDMA
or W-CDMA (with HSDPA) the channel bandwidth is 3.84 MHz. Channel Power
measures the power the base station is transmitting across the entire 3.84 MHz
W-CDMA or W-CDMA (with HSDPA) channel.
CPICH (Common Pilot Channel)
Common Pilot Channel (CPICH) is the channel that carries the scrambling code.
The CPICH metric reports the power in this channel in dBc. By default, the CPICH
Limits are set to Off. If you set CPICH Limits On, the default upper limit value is
0 dBc, and the lower limit value is –20 dBc.
NOTE The CPICH default limits are set at a level suitable for catching only gross errors
when field testing live signals. To perform conformance testing, you will need to set
the limits to your own specifications. Conformance testing for Test Model 2 (TM2),
for example, requires that the CPICH limits are set to ±2.9 dB, that is, to –7.1 dB
and –12.9 dB with a –10 dBc signal.
Control Channel Delta (Δ) Powers
The last column on the far right of the Metrics view shows the relative powers of the
five control channels relative to the Common Pilot Channel. For example,