Operating Manual Vol 1 - ES Documentation

Digital Standard W-CDMA (NTT DoCoMo/ARIB 0.0)SMIQ2.13 Digital Standard W-CDMA (NTT DoCoMo/ARIB 0.0)With the options Modulation Coder (SMIQB20), Data Generator (SMIQB11) and option Digital StandardW-CDMA (SMIQB43) provided, W-CDMA signals can be generated according to the Japaneseexperimental system NTT DoCoMo or the ARIB 0.0 standard 1 .SMIQ can simulate both the transmit signal of a base station (Downlink), and the transmit signal of amobile station (Uplink) with up to 15 code channels.Different physical channel types such as Perch, Common Control or Dedicated Physical Channel can beselected. For this purpose, SMIQ generates modulation data with the frame structure specified in thestandard (framed data). Data fields with pilot symbols, TPC symbols (Traffic Power Control) or LMSsymbols (Long Code Mask) are automatically generated. Freely programmable data lists or pseudorandombit sequences (PRBS) can be used for the modulation symbols in the DATA fields. Thesemodulation data are not subjected to any channel coding (convolution coding, interleaving). The usercan, however, store channel-coded modulation data in a data list to generate a logic channel, eg aDedicated Traffic Channel.The following figure shows the schematic of forward link signal generation.Fig. 2-88Downlink DPCH signal generation for a code channelThe Perch Channel, DPCH (Dedicated Physical Channel) and CCPCH (Common Control PhysicalChannel) are available as channel types in the downlink. The data rate for modulation data (frameddata) of the DPCH can be selected (32, 64, to 1024 ksymbol/s). The type of modulation is QPSK, but O-QPSK can also be set. A root cosine filter with roll-off factor 0.22 is preset for baseband filtering. Otherfilters can also be set (MODULATION FILTER). The chip rate is preset to 4.096 Mcps but can bemodified within wide limits.Two modes (LINK DIRECTION/MULTIPLEX) are available to generate an uplink signal. A mobile stationtransmitter of the Japanese W-CDMA experimental system is simulated in the UP mode. The framestructure of data corresponds to that of the downlink. DPCH and CCPCH are available as channeltypes.1Association of Radio Industries and Businesses (ARIB), Specifications of Air-Interface for a 3 G Mobile System1125.5555.03 2.150E-9