Agilent Technologies ESG Guia do Utilizador Página 356

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340 Chapter 14
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 14-7 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.
A: Primary set B: Secondary set
i = 6 i = 8
k = 0 k = 7
n = 96 n = 135
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