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Measuring Spread Spectrum and Multitone Signals
23
CDMA Signal Measurements
Figure 6 and Figure 7 show typical results obtained when measuring a CDMA
signal. In these examples, the error is determined by measuring the source at
the amplitude of interest, with and without CDMA modulation, adding
attenuation until the difference between the two values stops changing. The
CW sensor in Figure 6 uses correction factors to correct for power levels
beyond its square law operating region.
Figure 6 Wideband CDMA Error of Agilent E-series E9300 power
sensor versus corrected CW sensor
Figure 7 CDMA (IS-95A): 9Ch Fwd
1.2
1
0.8
0.6
0.4
-30 -20 -10 0 10
20
30
0.2
0
0.2
Power (dBm)
Error (dB)
Lower Range Erro
r
Upper Range Erro
r
CW Sensor Error
0.1
0.05
0
-0.05
-30 -20
-10
0
10
20
30
-0.1
-0.15
-0.2
Power (dBm)
Modulation Error (dB)
Lower Range Error
(E-Series E9300 power
sensor only shown)
Upper Range Error