Operating Manual Vol 1 - ES Documentation

SMIQEnhanced Functions For Digital Standard 3GPP W-CDMA (FDD)2.15.4 OCNS ChannelsA 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-powerorthogonal 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 MenuFig. 2-174DIGITAL STD - WCDMA/3GPP - OCNS CHANNELS menuOCNS NUMBER OFCHANNELSNumber of OCNS channels additionally added to the 3GPP W-CDMA signal(in addition to the enhanced channels). The maximum number of OCNSchannels depends on the OCNS symbol rate:MAX_NOF_OCNS_Channels =(Chip rate / OCNS SYMBOL RATE)– 4 enhanced channelsThis menu parameter is only effective after pressing EXECUTE ►.IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:COUN 10OCNS SYMBOLRATEOCNS CRESTSets 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 D240KThe crest factor of the OCNS signal can be influenced by setting thechannelization codes and timing offsets.MINIMUM: The crest factor is minimized (the channelization codes aredistributed uniformly over the code domain, the timing offsets areincreased by 3 from channel to channel).IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES MINAVERAGE: An average crest factor is set (the channelization codes aredistributed uniformly over the code domain, the timing offsets areall set to 0).IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES AVERWORST: The crest factor is set to an unfavourable value (i.e. maximum)(the channelization codes are assigned in ascending order. Thetiming offsets are all set to 0).IEC/IEEE-bus command :SOUR:W3GP:BST:OCNS:CRES WORS1125.5555.03 2.257E-9