Starting a phd soon in an area involving array signal processing, beamforming and multi user detection. I have. I have a background in dsp, but i am pretty much starting from zero when it comes to array processing. Ive been looking into ressources, and it’s meanly antenna arrays and not array processing from a dsp perspective. M not sure what’s the best way to approach it without getting lost in theory.
So i am asking the experts, or anyone who’s done resea in these areas, what resources, books, courses would u recommend?

Ps: any advice you’d known before starting your phd would be really appreciated. Thanks!