The error “Expected Input to be Finite” occurs when the input contains non-finite value(s). In this case the equalizer output pdschEq which serves as the input for nrPDSCHDecode function has inf values. This may be introduced if an unexpected value is encountered.
In the case of lteEqualizerZF applies the MIMO zero-forcing equalization to the received data resource grid using the channel information only. When zero-forcing equalizer attempts to invert the channel response matrix it will amplify the noise greatly at frequencies where the channel response matrix has a small magnitude. This would have led to the inf values in the equalization output.
In the case of nrEqualizeMMSE (which was replaced) applies MMSE equalization to the received resource grid by using the estimated channel information and the estimate of the received noise variance which can minimize the total power of the noise and ISI components in the output.
