Operating Manual Vol 1 - ES Documentation

Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)SMIQ2.15.3 Enhanced Channels BS1/MS1Enhanced Channels are channels which – in contrast to option SMIQB45 – are neither calculated norgenerated on the modulation coder but on the data generator. Up to four enhanced channels (or sevenwith uplink mode) are possible where the maximum sequence length is calculated from the free listmemory and the number of channels:Downlink:Available _ Data _ List _ Memory / BitsSequence _ Length / Frames =Number _ Of _ Enhanced _ Channels* 2* 38400With maximum memory capacity, there are thus between 255 (4 DPCH) and 1022 (1 DPCH) frames.In the downlink (possibly depending on memory capacity), a P-CCPCH/BCH with a continuous systemframe number (period 4096 frames) can also be generated at the same time as a DPCH (period 2044frames) with a max physical rate of 30 ksps.The simulation of higher rate channels (>30 ksps) together with the P-CCPCH/BCH is also supportedhowever with a reduced maximum sequence length of 500 frames.(For a systematic list of all possible sequence lengths see description of SEQUENCE LENGTHparameter, section Fehler! Verweisquelle konnte nicht gefunden werden.).Note:This sequence length is sufficient for all performance tests in [1], section 8, since in thesetests the block error rate is measured.Uplink:Sequence _ Length / Frames =Available _ Data _ List _ Memory /( Number _Of _ Enhanced _ChannelsBits+1 )* 38400With maximum memory capacity, there are thus between 255 (DPCCH + 6 DPDCH) and 1022 (1 DPCCHor 1 DPDCH) frames.Note:The higher number of channels in the uplink is possible through the BPSK data modulation.These long sequences allow a physical BER measurement (PN9) without a restart of the BER testerbeing required. An enhanced channel with a length of 511 frames is to be set.If the maximum length of 1022 frames is used, BER measurements with channel coding and withoutrestart as required for receiver tests to [1], [3], [4] are possible.Compared to the clearly enhanced sequence length range (max. 13 frames for SMIQB45), optionSMIQB48 offers the following advantages:After generation of the sequence in the data generator Data lists are available as data sources for thedata fields and the TPC fields. Externally precoded data can be loaded into the SMIQ by the user, forexample to implement channel-coding schemes that are not supported by option SMIQB48.Analogously, the long TPC lists are necessary to generate long non-repetitive power profiles.Moreover, a base station can be simulated, which comprises a channel-coded P-CCPCH (BCH) and a12.2 kbps reference measurement channel in addition to background and synchronization channels.The system frame number (SFN) in BCH is automatically incremented in steps of two from 0 to 4094(period 4096). The remaining system information of BCH can be filled from data lists, for example.Another feature of enhanced channels is the possibility to generate the reference measurementchannels described in [1], [3] and [4] and the AMR channels described in [5]. For a description see2.15.3.1.1.The chip sequences of the enhanced channels are transmitted in binary form to the modulation coderand are converted into (initially digital) I/Q levels in a mapper. This mapping can be switched by anexternal input line (TTL, connected to LEVATT (PARDATA pin 9 or SMIQ-Z5)). The channel powers ofthe enhanced channels can be controlled in real time, allowing the test of "SIR based closed looppower control", for example. For further information see 2.15.3.1.3.1125.5555.03 2.238 E-9