Operating Manual Vol 1 - ES Documentation

Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)SMIQ2.15.4.3 Favourable Sequence Length for OCNS MeasurementTo perform a realistic OCNS measurement, certain sequence length combinations are to be preferred.Both signal components (measurement channel and OCNS channels) are cyclically output. The cyclelength of the measurement channel can be entered in the ENHANCED CHANNEL (SEQUENCELENGTH) menu, the cycle of the OCNS channel in the WCDMA/3GPP menu.If these lengths are identical, also the overall signal is repeated with this cycle length. If the two lengths aredifferent, the overall signal is repeated with a cycle length that corresponds to the least common multipleof the individual lengths.To simulate a real base-station signal optimally, the overall cycle length should be selected as large aspossible. Therefore, both sequence lengths should be relatively prime. This is the case if two primenumbers are used, for example. The overall cycle length then becomes the product of the two sequencelengths.The values in section 2.15.4.2 are selected so that the overall cycle length becomes a maximum(1022*13 frames = 133 seconds).Note : To reduce the computation time for the signal it can be useful to use smaller sequence lengths.2.15.5 Additional MS Based On MS4Similar to simulating a realistic downlink signal for testing a mobile station receiver with OCNS (section2.15.4), there is a realistic uplink signal (for testing a base station receiver) consisting of the individualsignals of many mobile stations.Up to three mobile stations are configured, see section “Digital Standard 3GPP W-CDMA“ and section“WCDMA/3GPP menu - Submenu MS Configuration“.The fourth mobile station MS4 is used as a reference for all other stations. Based on the settings of thismobile station, all Additional Mobile Stations are calculated and the following parameters are modified:• Scrambling code (all stations are different)• Power (different from MS4, but same power)Fig. 2-175DIGITAL STD - WCDMA/3GPP ADDITIONAL MS STATE menu1125.5555.03 2.260 E-9