Chapter 2 WCDMA Call Mode
Testing User Equipment on WCDMA channels
WCDMA Options Version 6.20
61
Spectrum menu The group of spectrum measurements available in the Spectrum menu offers
functions for measuring the RF output spectrum emission. Spectrum measure-
ments for WCDMA include Occupied Bandwidth (OBW), Adjacent Channel
Leakage Power Ratio (ACLR) and Spectrum Emission Mask (SEM). In the Spec-
trum menu three marker tabs for the different spectrum analyzer measurements
are available: OBW, ACLR and SEM.
To gain access to this menu, select the [Spectrum ... ] marker tab. On selecting
the [Spectrum ... ] marker tab the OBW marker tab will be activated by default.
OBW (Occupied
Bandwidth)
This measurement shows the bandwidth which the UE’s signal occupies. The
occupied bandwidth identifies the frequency range into which a given
percentage of the signal power falls. 99% of the entire power should be spread
within a range of no more than 5 MHz around the carrier frequency. The purpose
of this measurement is to verify that the UE’s occupied bandwidth is lower than
5 MHz based on a chip rate of 3.84 Mcps. An occupied bandwidth exceeding this
value may increase interference with other channels or other systems
.
For a detailed description of the OBW measurement screen, measurement
parameters and results display refer to “OBW (Occupied Bandwidth)” on page 95
in Chapter 3 “WCDMA Non-Call Mode”.
ACLR (Adjacent Channel
Leakage Power Ratio)
This measurement determines the ratio of the spectral power in the neighbouring
channels to the power in the allocated channel. The purpose of this measurement
is to verify that the ACLR value does not exceed the WCDMA limits and to ensure
thereby that the mobile’s modulator does not create sideband emissions that
would then disturb transmission on adjacent traffic channels.
For a detailed description of the ACLR measurement screen, measurement
parameters and results display refer to “ACLR (Adjacent Channel Leakage Power
Ratio)” on page 96 in Chapter 3 “WCDMA Non-Call Mode”.
SEM (Spectrum Emission
Mask)
In the spectrum emission mask the signal spectrum outside the allocated channel
is measured.
For a detailed description of the SEM measurement screen, measurement param-
eters and results display refer to “SEM (Spectrum Emission Mask)” on page 98 in
Chapter 3 “WCDMA Non-Call Mode”.
UE Info menu The UE Info menu offers important information regarding the UE under test as
well as a measurement report. It consists of two results areas:
–UE Info and
– UE Measurement Report
The UE Info area displays the UE’s serial number, its power class, the dialed
number and important features.
To Next Page
Loading...
