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Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Understanding the PRACH
Figure 16-9
Data Part Power Determining Message Part Power
The message part power calculation is explained in the following section,
Message Part Power
As stated earlier, the message part power (dBm) is comprised of the control part and data part power levels.
The message part power is calculated using the sum of the linear power values for Data
dBm
(data part power)
and Cntl
dBm
(control part power). Use the following formula to calculate the message part power:
10 Log[10
(Data dbm / 10 + (-3))
+ 10
(Cntl dBm / 10 + (-3))
]
By adjusting the two power levels, you can make the message power less than, equal to, or greater than the
preamble power. In some situations, the message part power can exceed the carrier power. When this occurs,
the ESG will automatically adjust its carrier power, up to its limits, to accommodate the new message part
power. The following examples demonstrate some of the ways you can set the message part power:
Example 1:
This will result in a control part power level that is always 5 dB higher than the preamble therefore making
the message part power 5 dB higher than the preamble.
Preamble Power: -40 dBm
Pp-m: 5 dB
Ctrl Beta: 15
Data Beta: 0
Pp-m
Message Part Power =
−
25 dBm
Preamble
Data Part Power =
−
25.46 dBm
Control Part Power =
−
35 dBm
9.54 dB
Difference
−
30 dBm
−
5 dBm
(control part power (watts) + data part power (watts))
(Cntl
dBm
= Pre
dBm
+ Pp-m)
(Data
dBm
= Cntl
dBm
+ Pwr
diff
)
Summary of Contents for E4428C
Page 22: ...Contents xxii ...
Page 224: ...200 Chapter 4 Basic Digital Operation Creating and Using Bit Files ...
Page 228: ...204 Chapter 5 AWGN Waveform Generator Configuring the AWGN Generator ...
Page 229: ...205 6 Analog Modulation ...
Page 276: ...252 Chapter 7 Digital Signal Interface Module Operating the N5102A Module in Input Mode ...
Page 286: ...262 Chapter 8 Bluetooth Signals Turning On a Bluetooth Signal ...
Page 330: ...306 Chapter 9 BERT Verifying BERT Operation ...
Page 366: ...342 Chapter 10 CDMA Digital Modulation IS 95A Modulation ...
Page 394: ...370 Chapter 12 Multitone Waveform Generator Applying Changes to an Active Multitone Signal ...
Page 468: ...444 Chapter 15 W CDMA Digital Modulation for Component Test W CDMA Frame Structures ...
Page 667: ...643 18 Troubleshooting ...
Page 700: ...Index 676 Index ...