Unify scope preprocessing and simulation DSP handoff

projects/IMDD_base_system/imdd_it.m

@@ -1,3 +1,16 @@
+% IMDD simulation entrypoint
+%
+% Processing stages:
+
+% -> imdd_it
+% -> submit_handle
+% -> imdd_model
+    % -> PAMsource / AWG / EML / Fiber / Photodiode / Filter / Scope
+% -> dsp_scope_signal
+    % -> preprocessSignal
+    % -> FFE / DFE / VNLE+MLSE / DB target DSP branches
+% -> result packages stored in DataStorage
+
 close all;
 
 if 1
@@ -553,4 +566,4 @@ ylabel('BER');
 % clabel(C,h,'Color','k','FontWeight','bold');
 %
 % beautifyBERplot();
-% legend('BER contour lines');
+% legend('BER contour lines');