Noise Sources On The Downlink; Other Downlink Signal Settings - Agilent Technologies 8960 Series Reference Manual

FDD Test Operating Mode
Channel Codes
The following downlink channel codes can be specified:
• Primary scrambling code
scrambling code in order for the UE to decode the downlink channels and synchronize to the test set. The
current setting is displayed in the Downlink Code Channel Information window on the test set. This value
is used to configure the secondary synchronization channel (S-SCH).
• PICH channelization code
• DPCH 12.2 RMC channelization code
Channel Levels
The relative level of all FDD test channels can be individually set or turned off (although the P-CCPCH and
the SCH are controlled together). The level of each active channel is a fraction of the total cell power, expressed
in dB. If the summed level of all channels is less than one, OCNS is turned on to account for the difference. See
"CALL:FDDTest" .

Noise Sources on the Downlink

Additive White Gaussian Noise (AWGN)
AWGN can be summed into the downlink signal to simulate outside signal interference. When enabled, the
AWGN level must be set within +/-10 dB of the cell power setting. See
Orthogonal Channel Noise Simulator (OCNS)
OCNS is used to simulate additional users on the downlink. OCNS is automatically enabled when the sum of
the levels of all the enabled downlink physical channels is less than the cell power setting. OCNS is made up of
the following 16 separate code channels: 2, 11, 17, 23, 31, 38, 47, 55, 62, 69, 78, 85, 94, 113, 119, and 125. All
channels use a spreading factor of 128. The current setting is displayed in the Downlink Code Channel
Information window on the test set.
As individual downlink channel levels are adjusted, the composite OCNS level is automatically set to a value
equal to the difference between the summed downlink channel levels and the cell power setting. The fraction
of the composite OCNS power that is allocated to each of the code channels making up the composite OCNS
varies for each channel, and cannot be changed. See

Other Downlink Signal Settings

Cell Power
This setting specifies the combined power level of all code channels on the downlink from the test set,
expressed in dBm/3.84 MHz (including OCNS, if used). This does not include AWGN power.
The Call Setup Screen displays a window entitled Generated Power Level Information. The Total RF
Power listed in that window is the sum of the Cell Power and AWGN Power levels. The power level at the RF
IN/OUT or RF OUT ONLY connector is the Current Level of the Total RF Power plus any amplitude
offsets that have been entered. See
54
S:\Hp8960\E1963A WCDMA\3.2 release\Reference Guide\Chapters\wcdma_gen_bse_fddtest.fm
("CALL[:CELL]:SCODe"
("CALL:PICHannel"
("CALL:DPCHannel"
"Amplitude Offset"
). This value must match the UE expected downlink
).
)
"CALL:AWGNoise:POWer"
"CALL:OCNSource"
for more information on entering amplitude offsets.
.
.