No signal is generated by the test set during Cell Off operation, regardless of the Cell Power setting. All settings are deferred until the Active Cell operating mode or FDD Test operating mode is used.
To access the cell power parameter using the test set's front panel, see
How Do I Change Call Parameters?
.
To access the AWGN power parameter using the test set's the front panel,
How Do I Change Generator Information?
The power levels currently in use by the test set (as well as the "desired" levels) are displayed in the
Generated Power Level Information
window.
For the lab application only, the test set has the ability to simulate two individual cells (see
Soft Handover
). In the lab application, the total RF power consists of Cell 1 power, Cell 2 power and the AWGN power if their states are on.
For the lab application, an external AWGN value is displayed when the test set is configured to generate faded forward channel signals with AWGN enabled. This setup requires a rear panel digital bus connection to an external PC running Baseband Studio software. For details, see
Digital Bus Information
.
Cell Power, AWGN Power and Total RF Power Ranges
The range of values that you can set these power levels to differs from the actual hardware range of the source. This is due to compensation for path loss between the test set RF output port and the UE antenna connector (see
Amplitude Offset
).
For example, if you enter a value of -30 dBm for desired CW cell power, this indicates that you want -30 dBm of power at the UE antenna connector. So, if you have indicated an amplitude offset of -3.5 dB exists between the test set's RF In/Out port and the UE antenna connector, the source will actually have to output -26.5 dB in order to deliver -30 dB to the UE's antenna connector. Thus, with an amplitude offset of -3.5 dB, the settable range of CW cell power is -130.5 dB to -13.5 dB. The actual power range at a given time is defined by adding the value of the associated amplitude offset to the actual hardware range. If you select an invalid combination of power levels and amplitude offsets, an error message will appear at the bottom of the screen to alert you to this condition.
Range of Power Levels
|
Parameter
|
Actual Hardware Range with Amplitude Offset = 0 (RF In/Out Port)
|
Setting (or Query) Range
|
|
Cell Power (CW)
|
-127 dBm to -10 dBm
|
-177 dBm to +40 dBm
|
|
Cell Power (W-CDMA)
|
-115 dBm/3.84 MHz to -13 dBm/3.84 MHz
|
-165 dBm/3.84 MHz to +37 dBm/3.84 MHz
|
|
AWGN Power
|
-115 dBm/3.84 MHz to -15 dBm/3.84 MHz
|
-165 dBm/3.84 MHz to +35 dBm/3.84 MHz
|
|
Total RF Power
|
-115 dBm/3.84 MHz to -10.88 dBm/3.84 MHz
|
-165 dBm/3.84 MHz to +42 dBm/3.84 MHz
|
Considerations When Setting Power Levels
-
AWGN power must not be more than 10 dB above or 20 dB below cell power when both power states are set to ON.
-
The total RF power and amplitude offset must not set the source outside its valid hardware range.
top
of page