Operating Manual Vol 1 - ES Documentation

SMIQDigital Standard 3GPP W-CDMA (FDD)2.14.3.6.3 Base Stations with Spreading Codes Used Several Times3GPP W-CDMA envisages an increase in the number of channels using primary and secondaryscrambling codes. The PCCPCH and the first part of DPCHs is then sent with the primary scramblingcode, the remaining DPCHs with one of the assigned secondary scrambling codes. The following rangeof values is given in [2]:Primary scrambling code : n = 16 * i with i=0 to 511Secondary scrambling code : n = 16 * i + k with i=0 to 511 and k=1 to 15Note: The use of secondary scrambling codes principally yields the same results as theparameter T offset specified in former standards.When the secondary scrambling codes are used, orthogonality is impaired and a crosstalk is produced(see section 2.14.3.5.6).This scrambling code can be entered for a BS. If channels with different scrambling codes are to besimulated, a division into several BSs is required as described under 2.14.3.6.2:• Set several BSs according to 2.14.3.6.1. The special channels (SCH, CPICH, ...) will be activated inone BS only.• Set the desired values for the scrambling code for all BSs.2.14.3.6.4 Several Base Stations3GPP W-CDMA base stations can be at different RF frequencies. This case can be simulated inWinIQSIM using the multicarrier mixed signal system and option SMIQB60.Since there are normally not enough frequencies available, the base stations within a transmit frequencyare distinguished by the primary scrambling code.• Set several BSs according to 2.14.3.6.1.• Set the desired values for the scrambling code for all BSs.1125.5555.03 2.235E-9