Adjacent Channel Leakage Ratio Measurement Description; How Is An Adjacent Channel Leakage Ratio Measurement Made; Input Signal Requirements; Trigger Source - Agilent Technologies 8960 Series Reference Manual

Adjacent Channel Leakage Ratio Measurement Description

How is an adjacent channel leakage ratio measurement made?

Adjacent channel leakage ratio measures the relative power at ± 5 MHz and ± 10 MHz offsets from the uplink
channel. Power is measured through a Root-Raised Cosine (RRC) filter with a rolloff of α=0.22, and a
bandwidth equal to the chip rate (3.84 MHz). The ± 5 MHz measurements are referred to as the upper and
lower first adjacent channels; the ± 10 MHz measurements are referred to as the upper and lower second
adjacent channels. This measurement is defined in 3GPP TS 34.121, section 5.10, v3.2.0, Adjacent Channel
Power Leakage Ratio (ACLR).
Measurements for individual offsets can be turned off to increase measurement speed when these
measurements are not needed.
Measurements can be displayed in either numeric or graphical form. When the graphical display is used
(shown below), limits can be set for each offset to form a "limit line." When a limit is exceeded, the status
changes from "Pass" to "Fail."

Input Signal Requirements

• For this measurement the test set's receiver uses autoranging to adjust for the level of the signal being
measured; therefore, the expected signal level does not need to be specified during measurement setup.
• The frequency of the signal being measured must be in the range of 800 MHz to 1000 MHz, or from
1700 MHz to 1990 MHz.
• The level into the test set's RF IN/OUT connector must be in the range of +5 dBm to +28 dBm, in a
3.84 MHz bandwidth.

Trigger Source

The trigger source defaults to Auto for the adjacent channel leakage ratio measurement, and tries to use
protocol triggering if the mobile station (UE) is synchronized to the test set. Immediate triggering is used if
the mobile station is not synchronized.
Adjacent Channel Leakage Ratio Measurement Description
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