Operating Manual Vol 1 - ES Documentation

SMIQFading Simulation2.9.4.3 Menu MOVING DELAYIn the MOVING DELAY mode, the Fading Simulator simulates the dynamic propagation conditionsaccording to test case 3GPP, 25.104-320, Annex B3.2 paths are simulated; the delay of path 1 remains unchanged, the delay of path 2 slowly moves to andfro sinusoidally. The two paths have no fading profile (non-fading), have the same level, the same phaseand have no Doppler shift.P 2P 1t 1∆τt 2Fig. 2-42Two paths with menu MOVING DELAYThe delay of the moving path is obtained with the following equation:DELAY _VARIATION 2π⋅ t ∆τ = DELAY _MEAN +1+ sin()2 VARIATION _PERIOD The following settings are required to obtain the values suggested in Annex B3:DELAY (path 1) 1µsDELAY MEAN= DELAY(path 1) + DELAY VARIATION / 2 = 3.5µsDELAY VARIATION 5 µsVARIATION PERIOD 157 sFor further tests, DELAY MEAN and the variation parameters can be modified. The two paths can belevelled differently.Fig. 2-43Menu MOVING DELAYSTATEIGNORE RFCHANGES < 5%STANDARDActivating/deactivating the moving delay simulation.IEC/IEEE-bus command :SOUR:FSIM:MDEL:STAT ON | OFFWhen switched on, frequency variations below 5% are ignored. RF hopping isthus faster than 3 ms. IEC/IEEE-bus command :SOUR:FSIM:IGN:RFCH ONIs now the same as SET DEFAULT.1125.5555.03 2.81 E-9