Operating Manual Vol 1 - ES Documentation

Fading SimulationSMIQ2.9.3 Correlation between PathsFading processes of different paths normally do not depend on statistical processes. However, it ispossible to set a correlation of paths 1 to 6 with paths 7 to 12 in pairs. To set the correlation, a synchronoussignal processing is required for the two fading options which involves the following restrictions:• The correlation is always reciprocal, ie if path 1 is correlated with path 7, path 7 is also correlatedwith path 1 (CORR PATH).• The following parameters of the two paths have to correspond:- Fading profile PROFILE- Doppler parameter SPEED or DOPPLER FREQ- Magnitude of correlation coefficient COEFF• The following equation applies to the phase of the correlation coefficient and thus to the phase shiftbetween the correlated paths:ϕ 12 = 360° - ϕ 21• The parameters for Log Normal fading have to correspond for correlated paths.All parameter adaptations due to the limitations mentioned before are automatically performed by SMIQ.Note: After setting all parameters, the two fading options have to be synchronized by RESET andthen by RUN.2.9.4 Menu FADING SIMFig. 2-38Menu FADING SIM with submenusFADING SIMSelection of fading simulator mode.STANDARD FAD "Normal“ mode with 6 paths (with option SMIQB14) or 12paths (with SMIQB14 and SMIQB15), time resolution 50 ns.FINE DELAY Mode with fine time resolution. Two paths are possible foreach option (SMIQB14 / SMIQB15). The system bandwidthof the paths is limited to 4.6 MHz; this is sufficient for 3GPPwith 3.84 Msymb/s. Time resolution is 1 ns.MOVING DELAY Mode with 2 paths, one with a fixed delay, the other witha delay varying sinusoidally. This corresponds to testcase 3GPP, 25.104-320, Annex B3.BIRTH-DEATH Mode with 2 paths with a delay randomly varying within atime range.Note: The modes FINE DELAY, MOVING DELAY, BIRTH-DEATH arepossible only if software option SMIQB49 is built in.1125.5555.03 2.72 E-9