The disconnected inputs must be either put into a separate input criterion or marked as optional by setting their minimum multiplicity to zero to allow the process to execute.
Figure 6 shows the second approach, which USES only a single input and output criterion, but sets the minimum multiplicity of all disconnected inputs and outputs to zero.
This paper studies the application of minimum description length (MDL) criterion for estimating root-mean-squared (RMS) delay spread (RDS) for MIMO OFDM systems.