This collection of videos is made up of the prerecorded lecture videos from ECE678 offered during the Spring of 2021. This offering was during COVID, when live classes were not being offered at Purdue University. This makes the lectures a little dull, as there is no dialogue between the students and I. However, I did make an effort to be relatively complete and clear, as there was no student feedback. For this reason, you may find the lectures useful.