Î or is defined in C.S0033 as the received power spectral density of the Forward Channel as measured at the access terminal antenna connector. The Forward Channel is defined as a CDMA Channel from an access network to access terminals. The Forward Channel is transmitted on a CDMA frequency assignment using a particular pilot PN offset. If you have accounted for path loss (see Amplitude Offset ) between the test set output port and the access terminal antenna connector, then cell power is equivalent to Î or .
I oc is defined in C.S0033 as the power spectral density of a band-limited white noise source (simulating interference from other cells) as measured at the access terminal antenna connector. If you have accounted for path loss, then AWGN power is equivalent to I oc .
Total RF Power is the sum of cell power and AWGN power. I 0 is defined in C.S0033 as the total received power spectral density, including signal and interference, as measured at the access terminal antenna connector. If you have accounted for path loss, then total RF power is equivalent to I 0 .
is the ratio (in dB) of the combined received energy per bit to the effective noise power spectral density for the Control Channel or Forward Traffic Channel at the access terminal antenna connector (assuming you have accounted for path loss). It is calculated as follows:
Traffic E b /N t = Traffic_Chip_Bit + Î or /I oc (all in dB). (Traffic_Chip_Bit is the number of PN chips per Forward Traffic Channel bit.)
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 output and the access terminal 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 access terminal 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 access terminal's antenna connector, the source will actually have to output -26.5 dB in order to deliver -30 dB to the access terminal 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.
|-119 dBm to -2 dBm|
|-24.26 dB to +33.80 dB|
For the lab application , an external AWGN value is available when the test set is configured to generate faded forward channel signals with AWGN. This setup requires a rear panel digital bus connection to an external PC running Baseband Studio software. See Digital Bus Information for details.
The test set includes commands to set the desired cell power and AWGN power levels. You may also query what you've set these desired power levels to, as well as query what the total RF power will be based on your desired cell power and AWGN power levels. See "Command to Set/Query Desired Level" in RF Power Levels and Noise Ratio Commands .
The test set also includes commands to query the current level of cell power, AWGN power, total RF power and E b /N t . See "Command to Query Current Level" in RF Power Levels and Noise Ratio Commands . These CALL:STATus commands are query only. They return values that indicate the test set's actual hardware settings and hardware status. Actual hardware settings can differ from the desired level you've set if you've broken one of the rules above for setting power levels. If this happens, there will be a persistent error reported by the test set indicating the problem. When no error conditions exist, the commands used to set the desired level will return the same results as the commands used to query current level. For example, "CALL:AWGNoise:POWer?" will return the same value as "CALL:STATus:AWGNoise:POWer?" when no error conditions exist. Although the CALL:STATus commands are available for your use, it is a best practice to query the desired power levels instead and include error trapping in your control program to look for errors indicating the desired and current power levels are not equal (see Error Messages ).
|Command to Set/Query Desired Level||Command to Query Current Level|
|Total RF Power||CALL:STATus:TOTal:POWer[:AMPLitude]<[:SELected]|:DIGital856>?|
Manual Operation: How Do I Change Generator Information?