Chapter 17 635
W-CDMA Downlink Digital Modulation for Receiver Test
W-CDMA Downlink Concepts
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 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 17-35 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.
Tabl e 17- 6
A: Primary set B: Secondary set
i = 6 i = 8
k = 0 k = 7
n = 96 n = 135
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