478 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Multiple PRACH Overview
The offset is provided so the ESG can accommodate the additional power needed as more UEs (user
equipment/mobiles) are utilized. This offset remains constant on the ESG display regardless of the number
of UEs activated or parameter changes. However with the AWGN feature on, the addition of noise to the
PRACH signal will increase the offset. When this condition occurs, the ESG carrier power will remain
constant and the PRACH power level will decrease. This is demonstrated in Figure 16-23 where the AWGN
feature is on with a C/N value of 0.0 dB.
Figure 16-23 Offset Power with Noise Added
This offset will not create any problems with the multiple PRACH transmission. The typical test that utilizes
a multiple PRACH feature is used to discern a single PRACH transmission from among a group of PRACH
signals. The PRACH power values shown on the ESG display are valid and will be reflected in your
measurements, even when all UEs are on. They are also used to calculate the various other parameters like
the control part and data part power levels.
PRACH Power—22.77 dB Offset from Carrier Power
ESG Carrier Power
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