atlabSolutions,Proassignmenthelp,Matlabhelpers, Programmingshark,Mastlabsolutions.co.uk) and see what they are proposing to students as “projects” or advanced lab work. See for instance these links:
Digital Signal Processing (DSP at MatlabSolutions)
Projects | Discrete-Time Signal Processing | Electrical Engineering and Computer Science
Semester Theses (Semester theses at MatlabSolutions)
Master Theses (Advanced theses at MatlabSolutions)
Student Projects (MatlabSolutions)
Given that there are hundreds of DSP courses around the world, certainly it is possible to find many more lists with interesting student projects.