
456 Chapter 15
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
Figure 15-73 PRACH E
b
/N
o
Reference Selection
You can calculate the noise values using the following formulas:
T
p
= 10 Log[(C
w
+ N
w
) / .001]
T
p
= total noise power (dBm)
C
w
= linear carrier power (watts) across the 3.84 MHz bandwidth
N
w
= linear noise power (watts) across the 3.84 MHz bandwidth
C/N = E
b
/N
o
+ 10Log(Ref Data Rate/3.84 MHz)
These formulas clearly show the relationship between E
b
/N
o
and C/N and their effect on the
total noise power across the 3.84 MHz bandwidth.
DPCH Transmit Power Control by an External Signal
Figure 15-74 illustrates the DPCH power control using an external signal. When the Power
Hold is turned off, the ESG output responds to the power control trigger signal. The transmit
power control signal is sent from the base station and indicates whether to increase or
decrease the power level. Increases and decreases are done in increments of the specified
Power Step. Once the power level has reached the specified Max Power, signals requesting an
increase in the power level will be ignored (the power is clipped to Max Power). There is a 50
chip delay between the base station signal and the RF power response.
Eb/No Data Sources
Data Source Field
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