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Last updated: 2010-03-31
Adjacent Channel Leakage Ratio (ACLR) Measurement Description
Adjacent Channel Leakage Ratio (ACLR) Measurement Parameters
Adjacent Channel Leakage Ratio (ACLR) Measurement Results
As defined in 3GPP TS 34.122, ACLR is the ratio of the RRC filtered mean power centered on the adjacent channel frequency to the RRC filtered mean power centered on the assigned channel frequency. The adjacent channels are located at ±1.6 MHz and ±3.2 MHz offsets.
According to the standard, the ACLR should be no more than -33dB at the offsets of ±1.6MHz and no more than -43dB at the offsets of ±3.2MHz.
This measurement requires the calibration data of the measurement receiver path gain, which are part of the results of the measurement calibration, see Calibrate Measurements.
Multi-Measurement Count: see Multi-Measurement Count
Adjacent Limit: specifies the lower and upper adjacent (at the offset of ±1.6MHz) limit.
Alternate Limit: specifies the lower and upper alternate (at the offset of ±3.2MHz) limit.
Trigger Arm: see Trigger Arm
Trigger Source: see Trigger Source
Trigger Delay: see Trigger Delay
Time Slot to Measure: see Time Slot to Measure
Manual Power Range Offset: see Manual Power Range Offset
Measurement Timeout: see Measurement Timeout
Integrity Indicator: see Integrity Indicator
In-Channel Power: This result provides the in-channel power in dBm/1.28 MHz.
Pass/Fail, Average Leakage Power Level and Mask Margin for each Offset ( -3.2 MHz, -1.6 MHz, 1.6 MHz, and 3.2 MHz offsets).
Pass/Fail
Average Leakage Power Level
Mask Margin
Measurement results can be displayed in either numeric or graphic form. When the graphic 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."
When the numeric display is used, the average level (in dBc), mask margin (in dB) and the pass/fail for each offset is displayed. In-Channel Power is also displayed. See the picture below.
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The measured signal level is expected to be within 9 dB of the expected power.
Input signal level into the test set's RF IN/OUT connector is between +5 dBm and +28 dBm, in a 1.28 MHz bandwidth.
For Non-HSDPA channel type, the frequency of the measured signal should be within 20KHz from the expected receiver frequency; For HSDPA channel type, the frequency of the measured signal should be within 2KHz from the expected receiver frequency.
GPIB Commands: SETup:TACLeakage, FETCh:TACLeakage