456 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Understanding the PRACH
the relative power levels. A beta of zero means the power has been turned off for that particular relative
power. Table 16-1 shows the beta values and their respective ratios.
When betas are used, the control and data relative powers are calculated using the following formula:
Relative power = 20 Log (beta/15)
According to the 3GPP standards, at any instant in time, one of the betas for either the control or data power
will result in a ratio of one (0.00 dB). However the ESG gives you the flexibility to set your relative power
Table 16-1 Control and Data Part Betas
Beta Values for Control
and Data Beta
Amplitude/Voltage Ratios
15 1
14 14/15
13 13/15
12 12/15
11 11/15
10 10/15
99/15
88/15
77/15
66/15
55/15
44/15
33/15
22/15
11/15
0
Off
a
a. -40 dB for the ESG relative power levels
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