SMIQ Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)
1125.5555.03 E-92.257
2.15.4 OCNS Channels
A so-called Orthogonal Channel Noise (OCNS) has to be simulated for testing the maximum input level
([1], 7.4) of mobile stations (user equipment).
In addition to the 12.2 kbps measurement channel the base station signal comprises further high-power
orthogonal channels and a PCCPCH.
The OCNS setting function has a similar effect as Para. Predef. (see sect. Digital Standard 3GPP W-CDMA),
i.e. all parameters of the WCDMA/3GPP system are set to useful values.
2.15.4.1 OCNS Menu
Fig. 2-174 DIGITAL STD - WCDMA/3GPP - OCNS CHANNELS menu
OCNS NUMBER OF
CHANNELS
Number of OCNS channels additionally added to the 3GPP W-CDMA signal
(in addition to the enhanced channels). The maximum number of OCNS
channels depends on the OCNS symbol rate:
MAX_NOF_OCNS_Channels =
(Chip rate / OCNS SYMBOL RATE)
– 4 enhanced channels
This menu parameter is only effective after pressing EXECUTE ►.
IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:COUN 10
OCNS SYMBOL
RATE
Sets the symbol rate of all OCNS channels in ksps.
This menu parameter is only effective after pressing EXECUTE ►.
IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:SRAT D240K
OCNS CREST
The crest factor of the OCNS signal can be influenced by setting the
channelization codes and timing offsets.
MINIMUM: The crest factor is minimized (the channelization codes are
distributed uniformly over the code domain, the timing offsets are
increased by 3 from channel to channel).
IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES MIN
AVERAGE: An average crest factor is set (the channelization codes are
distributed uniformly over the code domain, the timing offsets are
all set to 0).
IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES AVER
WORST: The crest factor is set to an unfavourable value (i.e. maximum)
(the channelization codes are assigned in ascending order. The
timing offsets are all set to 0).
IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES WORS
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