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Adjacent Channel Power
Using the Adjacent Channel Power Measurement
Adjacent Channel Power Measurements for Korean PCS Band
Most Adjacent Channel Power standards specify the power in the adjacent channels
relative to the power in the target center channel. The standards for the Korean PCS
band are different in that the third adjacent channel is specified absolutely (that is, in
dBm) rather than relatively (that is, as dB).
The specifications for the Korean PCS band are shown in the next table.
Adjacent Channel Power
Korean PCS Band Specifications (All Frequencies within the Base Station
Transmit Band of 1840 MHz to 1870 MHz)
Offset From Carrier Frequency
Out of Band
Bandwidth
Power Level
+ / –885 kHz
30 kHz
–45 dB
+ / –1.98 MHz
30 kHz
–55 dB
+ / –2.25 MHz
1 MHz
–135 dBm
All frequencies not within the specific
1 MHz
bands allocated to the operator’s system
–135 dBm
Setting the Adjacent Channel Power Format
When performing an adjacent channel power measurement, several measurement
settings must be specified. The measurement settings include bandwidth and
measurement time for the center channel. In addition, the measurement settings for
the adjacent channels are:
•
number of adjacent channels
•
offset of the first adjacent channel from the center channel
•
offset of the adjacent channels from each other
•
measurement bandwidth and measurement time for each adjacent channel
These settings determine how the DSP measures the center channel and its adjacent
channels. Depending on the modulation type of the signal you are trying to measure
(CDMA, GSM, and so forth), different measurement bandwidths, times, and offsets
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