
162 Chapter 5
Adjacent Channel Power
W-CDMA Adjacent Channel Leakage Power Ratio (ACLR)
Measurements
Figure 5-1 Sample Measurement of ACLR on a Valid 3GPP W-CDMA Signal
Figure 5-1 is an example of the measurement results as a bar graph of the power
levels at different offsets. This gives you a quick reading of respective powers. The
bar graph is green with 'P' on the bar graph, indicating the ACLR measurement
passes at the 5 MHz and 10 MHz offsets.
NOTE The 3GPP TS 25.141 standard for W-CDMA requires the adjacent channel power
leakage ratio to be better than –44.2 dBc at 5 MHz offset and –49.2 dBc at 10 MHz
offset. The minimum requirements for the adjacent channel power leakage ratios are
–45 dBc and –50 dBc respectively, but the conformance test requirements add
0.8 dB tolerance to these figures. The conformance limits are consequently
–44.2 dBc at 5 MHz offset and –49.2 dBc at 10 MHz offset.
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