Chapter 16 573
W-CDMA Uplink Digital Modulation for Receiver Test
W-CDMA Uplink Concepts
Figure 16-88 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 16-89 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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