Chapter 16 571
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
When one of the conditions listed in Table 16-10 turns the ALC off, a manual power search must be
performed in order to ensure the correct output power level. Pressing the Apply Channel Setup softkey
executes the manual power search function. Temperature changes or changes to certain signal generator
settings may cause the output power level to change over time. Even though the Apply Needed
annunciator may be off, it is recommended that you press Apply Channel Setup to perform a manual power
search at least every hour to maintain the correct output power level.
W-CDMA AWGN Measurements and Bandwidths
The AWGN (additive white Gaussian noise) feature produces a noise signal across a
7.68 MHz bandwidth (2x the W-CDMA 3.84 MHz bandwidth) and lets you enter values that adjust the noise
level across this spectrum. To resolve the noise signal’s effect on the W-CDMA signal, the ESG also
displays noise values across the W-CDMA 3.84 MHz bandwidth. In addition, the DPCH AWGN feature
shows the bandwidth of the noise signal during the period when it has a flat frequency response. This is
called the flat-noise bandwidth. Figure 16-87 shows the different noise settings/values as they appear on the
W-CDMA AWGN display along with a graphical representation of the noise signal showing the different
bandwidth features.
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